From d116e812f9026e3cca46ce1009e577afec62916d Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:34 -0700 Subject: MIPS: KVM: Reformat code and comments No logic changes inside. Signed-off-by: Deng-Cheng Zhu Reviewed-by: James Hogan Signed-off-by: Paolo Bonzini --- arch/mips/kvm/kvm_locore.S | 55 +++--- arch/mips/kvm/kvm_mips.c | 179 +++++++++--------- arch/mips/kvm/kvm_mips_comm.h | 21 +- arch/mips/kvm/kvm_mips_commpage.c | 21 +- arch/mips/kvm/kvm_mips_dyntrans.c | 38 ++-- arch/mips/kvm/kvm_mips_emul.c | 389 +++++++++++++++++++------------------- arch/mips/kvm/kvm_mips_int.c | 45 +++-- arch/mips/kvm/kvm_mips_int.h | 22 ++- arch/mips/kvm/kvm_mips_opcode.h | 26 ++- arch/mips/kvm/kvm_mips_stats.c | 18 +- arch/mips/kvm/kvm_tlb.c | 194 +++++++++---------- arch/mips/kvm/kvm_trap_emul.c | 77 ++++---- arch/mips/kvm/trace.h | 18 +- 13 files changed, 554 insertions(+), 549 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/kvm_locore.S b/arch/mips/kvm/kvm_locore.S index 033ac343e72c..d7279c03c517 100644 --- a/arch/mips/kvm/kvm_locore.S +++ b/arch/mips/kvm/kvm_locore.S @@ -16,7 +16,6 @@ #include #include - #define _C_LABEL(x) x #define MIPSX(name) mips32_ ## name #define CALLFRAME_SIZ 32 @@ -91,7 +90,10 @@ FEXPORT(__kvm_mips_vcpu_run) LONG_S $24, PT_R24(k1) LONG_S $25, PT_R25(k1) - /* XXXKYMA k0/k1 not saved, not being used if we got here through an ioctl() */ + /* + * XXXKYMA k0/k1 not saved, not being used if we got here through + * an ioctl() + */ LONG_S $28, PT_R28(k1) LONG_S $29, PT_R29(k1) @@ -132,7 +134,10 @@ FEXPORT(__kvm_mips_vcpu_run) /* Save the kernel gp as well */ LONG_S gp, VCPU_HOST_GP(k1) - /* Setup status register for running the guest in UM, interrupts are disabled */ + /* + * Setup status register for running the guest in UM, interrupts + * are disabled + */ li k0, (ST0_EXL | KSU_USER | ST0_BEV) mtc0 k0, CP0_STATUS ehb @@ -152,7 +157,6 @@ FEXPORT(__kvm_mips_vcpu_run) mtc0 k0, CP0_STATUS ehb - /* Set Guest EPC */ LONG_L t0, VCPU_PC(k1) mtc0 t0, CP0_EPC @@ -165,7 +169,7 @@ FEXPORT(__kvm_mips_load_asid) INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */ 1: - /* t1: contains the base of the ASID array, need to get the cpu id */ + /* t1: contains the base of the ASID array, need to get the cpu id */ LONG_L t2, TI_CPU($28) /* smp_processor_id */ INT_SLL t2, t2, 2 /* x4 */ REG_ADDU t3, t1, t2 @@ -229,9 +233,7 @@ FEXPORT(__kvm_mips_load_k0k1) eret VECTOR(MIPSX(exception), unknown) -/* - * Find out what mode we came from and jump to the proper handler. - */ +/* Find out what mode we came from and jump to the proper handler. */ mtc0 k0, CP0_ERROREPC #01: Save guest k0 ehb #02: @@ -239,7 +241,8 @@ VECTOR(MIPSX(exception), unknown) INT_SRL k0, k0, 10 #03: Get rid of CPUNum INT_SLL k0, k0, 10 #04 LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000 - INT_ADDIU k0, k0, 0x2000 #06: Exception handler is installed @ offset 0x2000 + INT_ADDIU k0, k0, 0x2000 #06: Exception handler is + # installed @ offset 0x2000 j k0 #07: jump to the function nop #08: branch delay slot VECTOR_END(MIPSX(exceptionEnd)) @@ -248,7 +251,6 @@ VECTOR_END(MIPSX(exceptionEnd)) /* * Generic Guest exception handler. We end up here when the guest * does something that causes a trap to kernel mode. - * */ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) /* Get the VCPU pointer from DDTATA_LO */ @@ -290,9 +292,7 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) LONG_S $30, VCPU_R30(k1) LONG_S $31, VCPU_R31(k1) - /* We need to save hi/lo and restore them on - * the way out - */ + /* We need to save hi/lo and restore them on the way out */ mfhi t0 LONG_S t0, VCPU_HI(k1) @@ -321,8 +321,10 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) /* Save pointer to run in s0, will be saved by the compiler */ move s0, a0 - /* Save Host level EPC, BadVaddr and Cause to VCPU, useful to - * process the exception */ + /* + * Save Host level EPC, BadVaddr and Cause to VCPU, useful to + * process the exception + */ mfc0 k0,CP0_EPC LONG_S k0, VCPU_PC(k1) @@ -351,7 +353,6 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) LONG_L k0, VCPU_HOST_EBASE(k1) mtc0 k0,CP0_EBASE - /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ .set at and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE) @@ -369,7 +370,8 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) /* Saved host state */ INT_ADDIU sp, sp, -PT_SIZE - /* XXXKYMA do we need to load the host ASID, maybe not because the + /* + * XXXKYMA do we need to load the host ASID, maybe not because the * kernel entries are marked GLOBAL, need to verify */ @@ -383,9 +385,11 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) /* Jump to handler */ FEXPORT(__kvm_mips_jump_to_handler) - /* XXXKYMA: not sure if this is safe, how large is the stack?? + /* + * XXXKYMA: not sure if this is safe, how large is the stack?? * Now jump to the kvm_mips_handle_exit() to see if we can deal - * with this in the kernel */ + * with this in the kernel + */ PTR_LA t9, kvm_mips_handle_exit jalr.hb t9 INT_ADDIU sp, sp, -CALLFRAME_SIZ /* BD Slot */ @@ -394,7 +398,8 @@ FEXPORT(__kvm_mips_jump_to_handler) di ehb - /* XXXKYMA: k0/k1 could have been blown away if we processed + /* + * XXXKYMA: k0/k1 could have been blown away if we processed * an exception while we were handling the exception from the * guest, reload k1 */ @@ -402,7 +407,8 @@ FEXPORT(__kvm_mips_jump_to_handler) move k1, s1 INT_ADDIU k1, k1, VCPU_HOST_ARCH - /* Check return value, should tell us if we are returning to the + /* + * Check return value, should tell us if we are returning to the * host (handle I/O etc)or resuming the guest */ andi t0, v0, RESUME_HOST @@ -521,8 +527,10 @@ __kvm_mips_return_to_host: LONG_L $0, PT_R0(k1) LONG_L $1, PT_R1(k1) - /* r2/v0 is the return code, shift it down by 2 (arithmetic) - * to recover the err code */ + /* + * r2/v0 is the return code, shift it down by 2 (arithmetic) + * to recover the err code + */ INT_SRA k0, v0, 2 move $2, k0 @@ -566,7 +574,6 @@ __kvm_mips_return_to_host: PTR_LI k0, 0x2000000F mtc0 k0, CP0_HWRENA - /* Restore RA, which is the address we will return to */ LONG_L ra, PT_R31(k1) j ra diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c index cd5e4f568439..52be52adf030 100644 --- a/arch/mips/kvm/kvm_mips.c +++ b/arch/mips/kvm/kvm_mips.c @@ -7,7 +7,7 @@ * * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. * Authors: Sanjay Lal -*/ + */ #include #include @@ -31,38 +31,41 @@ #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif -#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU +#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x) struct kvm_stats_debugfs_item debugfs_entries[] = { - { "wait", VCPU_STAT(wait_exits) }, - { "cache", VCPU_STAT(cache_exits) }, - { "signal", VCPU_STAT(signal_exits) }, - { "interrupt", VCPU_STAT(int_exits) }, - { "cop_unsuable", VCPU_STAT(cop_unusable_exits) }, - { "tlbmod", VCPU_STAT(tlbmod_exits) }, - { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) }, - { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) }, - { "addrerr_st", VCPU_STAT(addrerr_st_exits) }, - { "addrerr_ld", VCPU_STAT(addrerr_ld_exits) }, - { "syscall", VCPU_STAT(syscall_exits) }, - { "resvd_inst", VCPU_STAT(resvd_inst_exits) }, - { "break_inst", VCPU_STAT(break_inst_exits) }, - { "flush_dcache", VCPU_STAT(flush_dcache_exits) }, - { "halt_wakeup", VCPU_STAT(halt_wakeup) }, + { "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU }, + { "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU }, + { "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU }, + { "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU }, + { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU }, + { "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU }, + { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU }, + { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU }, + { "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU }, + { "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU }, + { "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU }, + { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU }, + { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU }, + { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU }, + { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU }, {NULL} }; static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu) { int i; + for_each_possible_cpu(i) { vcpu->arch.guest_kernel_asid[i] = 0; vcpu->arch.guest_user_asid[i] = 0; } + return 0; } -/* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we - * are "runnable" if interrupts are pending +/* + * XXXKYMA: We are simulatoring a processor that has the WII bit set in + * Config7, so we are "runnable" if interrupts are pending */ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) { @@ -103,7 +106,10 @@ static void kvm_mips_init_tlbs(struct kvm *kvm) { unsigned long wired; - /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */ + /* + * Add a wired entry to the TLB, it is used to map the commpage to + * the Guest kernel + */ wired = read_c0_wired(); write_c0_wired(wired + 1); mtc0_tlbw_hazard(); @@ -130,7 +136,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1); } - return 0; } @@ -185,8 +190,8 @@ void kvm_arch_destroy_vm(struct kvm *kvm) } } -long -kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) +long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { return -ENOIOCTLCMD; } @@ -207,17 +212,17 @@ void kvm_arch_memslots_updated(struct kvm *kvm) } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + struct kvm_userspace_memory_region *mem, + enum kvm_mr_change change) { return 0; } void kvm_arch_commit_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - enum kvm_mr_change change) + struct kvm_userspace_memory_region *mem, + const struct kvm_memory_slot *old, + enum kvm_mr_change change) { unsigned long npages = 0; int i, err = 0; @@ -246,9 +251,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, npages, kvm->arch.guest_pmap); /* Now setup the page table */ - for (i = 0; i < npages; i++) { + for (i = 0; i < npages; i++) kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE; - } } } out: @@ -270,8 +274,6 @@ void kvm_arch_flush_shadow(struct kvm *kvm) struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { - extern char mips32_exception[], mips32_exceptionEnd[]; - extern char mips32_GuestException[], mips32_GuestExceptionEnd[]; int err, size, offset; void *gebase; int i; @@ -290,14 +292,14 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu); - /* Allocate space for host mode exception handlers that handle + /* + * Allocate space for host mode exception handlers that handle * guest mode exits */ - if (cpu_has_veic || cpu_has_vint) { + if (cpu_has_veic || cpu_has_vint) size = 0x200 + VECTORSPACING * 64; - } else { + else size = 0x4000; - } /* Save Linux EBASE */ vcpu->arch.host_ebase = (void *)read_c0_ebase(); @@ -345,7 +347,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) local_flush_icache_range((unsigned long)gebase, (unsigned long)gebase + ALIGN(size, PAGE_SIZE)); - /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */ + /* + * Allocate comm page for guest kernel, a TLB will be reserved for + * mapping GVA @ 0xFFFF8000 to this page + */ vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL); if (!vcpu->arch.kseg0_commpage) { @@ -391,9 +396,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) kvm_arch_vcpu_free(vcpu); } -int -kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, - struct kvm_guest_debug *dbg) +int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, + struct kvm_guest_debug *dbg) { return -ENOIOCTLCMD; } @@ -430,8 +434,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) return r; } -int -kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq) +int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) { int intr = (int)irq->irq; struct kvm_vcpu *dvcpu = NULL; @@ -458,23 +462,20 @@ kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq) dvcpu->arch.wait = 0; - if (waitqueue_active(&dvcpu->wq)) { + if (waitqueue_active(&dvcpu->wq)) wake_up_interruptible(&dvcpu->wq); - } return 0; } -int -kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) +int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) { return -ENOIOCTLCMD; } -int -kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) +int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) { return -ENOIOCTLCMD; } @@ -631,10 +632,12 @@ static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, } if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; + return put_user(v, uaddr64); } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; u32 v32 = (u32)v; + return put_user(v32, uaddr32); } else { return -EINVAL; @@ -727,8 +730,8 @@ static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, return 0; } -long -kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) +long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; @@ -738,6 +741,7 @@ kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) case KVM_SET_ONE_REG: case KVM_GET_ONE_REG: { struct kvm_one_reg reg; + if (copy_from_user(®, argp, sizeof(reg))) return -EFAULT; if (ioctl == KVM_SET_ONE_REG) @@ -772,6 +776,7 @@ kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) case KVM_INTERRUPT: { struct kvm_mips_interrupt irq; + r = -EFAULT; if (copy_from_user(&irq, argp, sizeof(irq))) goto out; @@ -790,9 +795,7 @@ out: return r; } -/* - * Get (and clear) the dirty memory log for a memory slot. - */ +/* Get (and clear) the dirty memory log for a memory slot. */ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { struct kvm_memory_slot *memslot; @@ -859,14 +862,14 @@ void kvm_arch_exit(void) kvm_mips_callbacks = NULL; } -int -kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) { return -ENOIOCTLCMD; } -int -kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) { return -ENOIOCTLCMD; } @@ -979,14 +982,11 @@ static void kvm_mips_comparecount_func(unsigned long data) kvm_mips_callbacks->queue_timer_int(vcpu); vcpu->arch.wait = 0; - if (waitqueue_active(&vcpu->wq)) { + if (waitqueue_active(&vcpu->wq)) wake_up_interruptible(&vcpu->wq); - } } -/* - * low level hrtimer wake routine. - */ +/* low level hrtimer wake routine */ static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) { struct kvm_vcpu *vcpu; @@ -1010,8 +1010,8 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) return; } -int -kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr) +int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, + struct kvm_translation *tr) { return 0; } @@ -1022,8 +1022,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) return kvm_mips_callbacks->vcpu_setup(vcpu); } -static -void kvm_mips_set_c0_status(void) +static void kvm_mips_set_c0_status(void) { uint32_t status = read_c0_status(); @@ -1053,7 +1052,10 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) run->exit_reason = KVM_EXIT_UNKNOWN; run->ready_for_interrupt_injection = 1; - /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */ + /* + * Set the appropriate status bits based on host CPU features, + * before we hit the scheduler + */ kvm_mips_set_c0_status(); local_irq_enable(); @@ -1061,7 +1063,8 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n", cause, opc, run, vcpu); - /* Do a privilege check, if in UM most of these exit conditions end up + /* + * Do a privilege check, if in UM most of these exit conditions end up * causing an exception to be delivered to the Guest Kernel */ er = kvm_mips_check_privilege(cause, opc, run, vcpu); @@ -1080,9 +1083,8 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) ++vcpu->stat.int_exits; trace_kvm_exit(vcpu, INT_EXITS); - if (need_resched()) { + if (need_resched()) cond_resched(); - } ret = RESUME_GUEST; break; @@ -1094,9 +1096,8 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS); ret = kvm_mips_callbacks->handle_cop_unusable(vcpu); /* XXXKYMA: Might need to return to user space */ - if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) { + if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) ret = RESUME_HOST; - } break; case T_TLB_MOD: @@ -1106,10 +1107,9 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) break; case T_TLB_ST_MISS: - kvm_debug - ("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n", - cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, - badvaddr); + kvm_debug("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n", + cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, + badvaddr); ++vcpu->stat.tlbmiss_st_exits; trace_kvm_exit(vcpu, TLBMISS_ST_EXITS); @@ -1156,10 +1156,9 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) break; default: - kvm_err - ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n", - exccode, opc, kvm_get_inst(opc, vcpu), badvaddr, - kvm_read_c0_guest_status(vcpu->arch.cop0)); + kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n", + exccode, opc, kvm_get_inst(opc, vcpu), badvaddr, + kvm_read_c0_guest_status(vcpu->arch.cop0)); kvm_arch_vcpu_dump_regs(vcpu); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; @@ -1174,7 +1173,7 @@ skip_emul: kvm_mips_deliver_interrupts(vcpu, cause); if (!(ret & RESUME_HOST)) { - /* Only check for signals if not already exiting to userspace */ + /* Only check for signals if not already exiting to userspace */ if (signal_pending(current)) { run->exit_reason = KVM_EXIT_INTR; ret = (-EINTR << 2) | RESUME_HOST; @@ -1195,11 +1194,13 @@ int __init kvm_mips_init(void) if (ret) return ret; - /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs. - * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c) - * to avoid the possibility of double faulting. The issue is that the TLB code - * references routines that are part of the the KVM module, - * which are only available once the module is loaded. + /* + * On MIPS, kernel modules are executed from "mapped space", which + * requires TLBs. The TLB handling code is statically linked with + * the rest of the kernel (kvm_tlb.c) to avoid the possibility of + * double faulting. The issue is that the TLB code references + * routines that are part of the the KVM module, which are only + * available once the module is loaded. */ kvm_mips_gfn_to_pfn = gfn_to_pfn; kvm_mips_release_pfn_clean = kvm_release_pfn_clean; diff --git a/arch/mips/kvm/kvm_mips_comm.h b/arch/mips/kvm/kvm_mips_comm.h index a4a8c85cc8f7..08c5fa2bbc0f 100644 --- a/arch/mips/kvm/kvm_mips_comm.h +++ b/arch/mips/kvm/kvm_mips_comm.h @@ -1,19 +1,20 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: commpage: mapped into get kernel space -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: commpage: mapped into get kernel space + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #ifndef __KVM_MIPS_COMMPAGE_H__ #define __KVM_MIPS_COMMPAGE_H__ struct kvm_mips_commpage { - struct mips_coproc cop0; /* COP0 state is mapped into Guest kernel via commpage */ + /* COP0 state is mapped into Guest kernel via commpage */ + struct mips_coproc cop0; }; #define KVM_MIPS_COMM_EIDI_OFFSET 0x0 diff --git a/arch/mips/kvm/kvm_mips_commpage.c b/arch/mips/kvm/kvm_mips_commpage.c index 3873b1ecc40f..ab7096ec0666 100644 --- a/arch/mips/kvm/kvm_mips_commpage.c +++ b/arch/mips/kvm/kvm_mips_commpage.c @@ -1,14 +1,14 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* commpage, currently used for Virtual COP0 registers. -* Mapped into the guest kernel @ 0x0. -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * commpage, currently used for Virtual COP0 registers. + * Mapped into the guest kernel @ 0x0. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -27,6 +27,7 @@ void kvm_mips_commpage_init(struct kvm_vcpu *vcpu) { struct kvm_mips_commpage *page = vcpu->arch.kseg0_commpage; + memset(page, 0, sizeof(struct kvm_mips_commpage)); /* Specific init values for fields */ diff --git a/arch/mips/kvm/kvm_mips_dyntrans.c b/arch/mips/kvm/kvm_mips_dyntrans.c index b80e41d858fd..fa7184df5450 100644 --- a/arch/mips/kvm/kvm_mips_dyntrans.c +++ b/arch/mips/kvm/kvm_mips_dyntrans.c @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: Binary Patching for privileged instructions, reduces traps. -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Binary Patching for privileged instructions, reduces traps. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -28,9 +28,8 @@ #define CLEAR_TEMPLATE 0x00000020 #define SW_TEMPLATE 0xac000000 -int -kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc, - struct kvm_vcpu *vcpu) +int kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc, + struct kvm_vcpu *vcpu) { int result = 0; unsigned long kseg0_opc; @@ -47,12 +46,11 @@ kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc, } /* - * Address based CACHE instructions are transformed into synci(s). A little heavy - * for just D-cache invalidates, but avoids an expensive trap + * Address based CACHE instructions are transformed into synci(s). A little + * heavy for just D-cache invalidates, but avoids an expensive trap */ -int -kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc, - struct kvm_vcpu *vcpu) +int kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc, + struct kvm_vcpu *vcpu) { int result = 0; unsigned long kseg0_opc; @@ -72,8 +70,7 @@ kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc, return result; } -int -kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) +int kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) { int32_t rt, rd, sel; uint32_t mfc0_inst; @@ -115,8 +112,7 @@ kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) return 0; } -int -kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) +int kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) { int32_t rt, rd, sel; uint32_t mtc0_inst = SW_TEMPLATE; diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c index 8d4840090082..9ec9f1d54b9b 100644 --- a/arch/mips/kvm/kvm_mips_emul.c +++ b/arch/mips/kvm/kvm_mips_emul.c @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: Instruction/Exception emulation -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Instruction/Exception emulation + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -51,18 +51,14 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, if (epc & 3) goto unaligned; - /* - * Read the instruction - */ + /* Read the instruction */ insn.word = kvm_get_inst((uint32_t *) epc, vcpu); if (insn.word == KVM_INVALID_INST) return KVM_INVALID_INST; switch (insn.i_format.opcode) { - /* - * jr and jalr are in r_format format. - */ + /* jr and jalr are in r_format format. */ case spec_op: switch (insn.r_format.func) { case jalr_op: @@ -124,18 +120,16 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, dspcontrol = rddsp(0x01); - if (dspcontrol >= 32) { + if (dspcontrol >= 32) epc = epc + 4 + (insn.i_format.simmediate << 2); - } else + else epc += 8; nextpc = epc; break; } break; - /* - * These are unconditional and in j_format. - */ + /* These are unconditional and in j_format. */ case jal_op: arch->gprs[31] = instpc + 8; case j_op: @@ -146,9 +140,7 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, nextpc = epc; break; - /* - * These are conditional and in i_format. - */ + /* These are conditional and in i_format. */ case beq_op: case beql_op: if (arch->gprs[insn.i_format.rs] == @@ -189,9 +181,7 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, nextpc = epc; break; - /* - * And now the FPA/cp1 branch instructions. - */ + /* And now the FPA/cp1 branch instructions. */ case cop1_op: printk("%s: unsupported cop1_op\n", __func__); break; @@ -219,7 +209,8 @@ enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause) er = EMULATE_FAIL; } else { vcpu->arch.pc = branch_pc; - kvm_debug("BD update_pc(): New PC: %#lx\n", vcpu->arch.pc); + kvm_debug("BD update_pc(): New PC: %#lx\n", + vcpu->arch.pc); } } else vcpu->arch.pc += 4; @@ -240,6 +231,7 @@ enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause) static inline int kvm_mips_count_disabled(struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; + return (vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) || (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC); } @@ -392,7 +384,6 @@ static ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, return now; } - /** * kvm_mips_resume_hrtimer() - Resume hrtimer, updating expiry. * @vcpu: Virtual CPU. @@ -781,8 +772,9 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) vcpu->arch.wait = 1; kvm_vcpu_block(vcpu); - /* We we are runnable, then definitely go off to user space to check if any - * I/O interrupts are pending. + /* + * We we are runnable, then definitely go off to user space to + * check if any I/O interrupts are pending. */ if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) { clear_bit(KVM_REQ_UNHALT, &vcpu->requests); @@ -793,8 +785,9 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) return er; } -/* XXXKYMA: Linux doesn't seem to use TLBR, return EMULATE_FAIL for now so that we can catch - * this, if things ever change +/* + * XXXKYMA: Linux doesn't seem to use TLBR, return EMULATE_FAIL for now so that + * we can catch this, if things ever change */ enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) { @@ -827,21 +820,22 @@ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) } tlb = &vcpu->arch.guest_tlb[index]; -#if 1 - /* Probe the shadow host TLB for the entry being overwritten, if one matches, invalidate it */ + /* + * Probe the shadow host TLB for the entry being overwritten, if one + * matches, invalidate it + */ kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); -#endif tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); - kvm_debug - ("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), kvm_read_c0_guest_entrylo1(cop0), - kvm_read_c0_guest_pagemask(cop0)); + kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0), + kvm_read_c0_guest_pagemask(cop0)); return er; } @@ -855,12 +849,8 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) uint32_t pc = vcpu->arch.pc; int index; -#if 1 get_random_bytes(&index, sizeof(index)); index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); -#else - index = jiffies % KVM_MIPS_GUEST_TLB_SIZE; -#endif if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { printk("%s: illegal index: %d\n", __func__, index); @@ -869,21 +859,21 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) tlb = &vcpu->arch.guest_tlb[index]; -#if 1 - /* Probe the shadow host TLB for the entry being overwritten, if one matches, invalidate it */ + /* + * Probe the shadow host TLB for the entry being overwritten, if one + * matches, invalidate it + */ kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); -#endif tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); - kvm_debug - ("[%#x] COP0_TLBWR[%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), - kvm_read_c0_guest_entrylo1(cop0)); + kvm_debug("[%#x] COP0_TLBWR[%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0)); return er; } @@ -906,9 +896,9 @@ enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) return er; } -enum emulation_result -kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, + uint32_t cause, struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; enum emulation_result er = EMULATE_DONE; @@ -922,9 +912,8 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, */ curr_pc = vcpu->arch.pc; er = update_pc(vcpu, cause); - if (er == EMULATE_FAIL) { + if (er == EMULATE_FAIL) return er; - } copz = (inst >> 21) & 0x1f; rt = (inst >> 16) & 0x1f; @@ -973,8 +962,7 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, #ifdef CONFIG_KVM_MIPS_DYN_TRANS kvm_mips_trans_mfc0(inst, opc, vcpu); #endif - } - else { + } else { vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; #ifdef CONFIG_KVM_MIPS_DYN_TRANS @@ -1014,17 +1002,15 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, kvm_read_c0_guest_ebase(cop0)); } else if (rd == MIPS_CP0_TLB_HI && sel == 0) { uint32_t nasid = - vcpu->arch.gprs[rt] & ASID_MASK; - if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) - && + vcpu->arch.gprs[rt] & ASID_MASK; + if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) && ((kvm_read_c0_guest_entryhi(cop0) & ASID_MASK) != nasid)) { - - kvm_debug - ("MTCz, change ASID from %#lx to %#lx\n", - kvm_read_c0_guest_entryhi(cop0) & - ASID_MASK, - vcpu->arch.gprs[rt] & ASID_MASK); + kvm_debug("MTCz, change ASID from %#lx to %#lx\n", + kvm_read_c0_guest_entryhi(cop0) + & ASID_MASK, + vcpu->arch.gprs[rt] + & ASID_MASK); /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); @@ -1049,7 +1035,10 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, } else if ((rd == MIPS_CP0_STATUS) && (sel == 0)) { kvm_write_c0_guest_status(cop0, vcpu->arch.gprs[rt]); - /* Make sure that CU1 and NMI bits are never set */ + /* + * Make sure that CU1 and NMI bits are + * never set + */ kvm_clear_c0_guest_status(cop0, (ST0_CU1 | ST0_NMI)); @@ -1058,6 +1047,7 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, #endif } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) { uint32_t old_cause, new_cause; + old_cause = kvm_read_c0_guest_cause(cop0); new_cause = vcpu->arch.gprs[rt]; /* Update R/W bits */ @@ -1115,7 +1105,10 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, cop0->reg[MIPS_CP0_STATUS][2] & 0xf; uint32_t pss = (cop0->reg[MIPS_CP0_STATUS][2] >> 6) & 0xf; - /* We don't support any shadow register sets, so SRSCtl[PSS] == SRSCtl[CSS] = 0 */ + /* + * We don't support any shadow register sets, so + * SRSCtl[PSS] == SRSCtl[CSS] = 0 + */ if (css || pss) { er = EMULATE_FAIL; break; @@ -1135,12 +1128,9 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause, } done: - /* - * Rollback PC only if emulation was unsuccessful - */ - if (er == EMULATE_FAIL) { + /* Rollback PC only if emulation was unsuccessful */ + if (er == EMULATE_FAIL) vcpu->arch.pc = curr_pc; - } dont_update_pc: /* @@ -1152,9 +1142,9 @@ dont_update_pc: return er; } -enum emulation_result -kvm_mips_emulate_store(uint32_t inst, uint32_t cause, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_store(uint32_t inst, uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DO_MMIO; int32_t op, base, rt, offset; @@ -1257,19 +1247,16 @@ kvm_mips_emulate_store(uint32_t inst, uint32_t cause, break; } - /* - * Rollback PC if emulation was unsuccessful - */ - if (er == EMULATE_FAIL) { + /* Rollback PC if emulation was unsuccessful */ + if (er == EMULATE_FAIL) vcpu->arch.pc = curr_pc; - } return er; } -enum emulation_result -kvm_mips_emulate_load(uint32_t inst, uint32_t cause, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_load(uint32_t inst, uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DO_MMIO; int32_t op, base, rt, offset; @@ -1410,13 +1397,12 @@ int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) #define MIPS_CACHE_DCACHE 0x1 #define MIPS_CACHE_SEC 0x3 -enum emulation_result -kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, uint32_t cause, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, + uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; - extern void (*r4k_blast_dcache) (void); - extern void (*r4k_blast_icache) (void); enum emulation_result er = EMULATE_DONE; int32_t offset, cache, op_inst, op, base; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1443,14 +1429,15 @@ kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, uint32_t cause, kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", cache, op, base, arch->gprs[base], offset); - /* Treat INDEX_INV as a nop, basically issued by Linux on startup to invalidate - * the caches entirely by stepping through all the ways/indexes + /* + * Treat INDEX_INV as a nop, basically issued by Linux on startup to + * invalidate the caches entirely by stepping through all the + * ways/indexes */ if (op == MIPS_CACHE_OP_INDEX_INV) { - kvm_debug - ("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - vcpu->arch.pc, vcpu->arch.gprs[31], cache, op, base, - arch->gprs[base], offset); + kvm_debug("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + vcpu->arch.pc, vcpu->arch.gprs[31], cache, op, base, + arch->gprs[base], offset); if (cache == MIPS_CACHE_DCACHE) r4k_blast_dcache(); @@ -1470,21 +1457,19 @@ kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, uint32_t cause, preempt_disable(); if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) { - - if (kvm_mips_host_tlb_lookup(vcpu, va) < 0) { + if (kvm_mips_host_tlb_lookup(vcpu, va) < 0) kvm_mips_handle_kseg0_tlb_fault(va, vcpu); - } } else if ((KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0) || KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) { int index; /* If an entry already exists then skip */ - if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0) { + if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0) goto skip_fault; - } - /* If address not in the guest TLB, then give the guest a fault, the - * resulting handler will do the right thing + /* + * If address not in the guest TLB, then give the guest a fault, + * the resulting handler will do the right thing */ index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) | (kvm_read_c0_guest_entryhi @@ -1499,14 +1484,20 @@ kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, uint32_t cause, goto dont_update_pc; } else { struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; - /* Check if the entry is valid, if not then setup a TLB invalid exception to the guest */ + /* + * Check if the entry is valid, if not then setup a TLB + * invalid exception to the guest + */ if (!TLB_IS_VALID(*tlb, va)) { er = kvm_mips_emulate_tlbinv_ld(cause, NULL, run, vcpu); preempt_enable(); goto dont_update_pc; } else { - /* We fault an entry from the guest tlb to the shadow host TLB */ + /* + * We fault an entry from the guest tlb to the + * shadow host TLB + */ kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, NULL, NULL); @@ -1530,7 +1521,10 @@ skip_fault: flush_dcache_line(va); #ifdef CONFIG_KVM_MIPS_DYN_TRANS - /* Replace the CACHE instruction, with a SYNCI, not the same, but avoids a trap */ + /* + * Replace the CACHE instruction, with a SYNCI, not the same, + * but avoids a trap + */ kvm_mips_trans_cache_va(inst, opc, vcpu); #endif } else if (op == MIPS_CACHE_OP_HIT_INV && cache == MIPS_CACHE_ICACHE) { @@ -1552,28 +1546,23 @@ skip_fault: preempt_enable(); - dont_update_pc: - /* - * Rollback PC - */ +dont_update_pc: + /* Rollback PC */ vcpu->arch.pc = curr_pc; - done: +done: return er; } -enum emulation_result -kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DONE; uint32_t inst; - /* - * Fetch the instruction. - */ - if (cause & CAUSEF_BD) { + /* Fetch the instruction. */ + if (cause & CAUSEF_BD) opc += 1; - } inst = kvm_get_inst(opc, vcpu); @@ -1611,9 +1600,10 @@ kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_syscall(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_syscall(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1645,9 +1635,10 @@ kvm_mips_emulate_syscall(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_tlbmiss_ld(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1691,9 +1682,10 @@ kvm_mips_emulate_tlbmiss_ld(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_tlbinv_ld(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1737,9 +1729,10 @@ kvm_mips_emulate_tlbinv_ld(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_tlbmiss_st(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1781,9 +1774,10 @@ kvm_mips_emulate_tlbmiss_st(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_tlbinv_st(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1826,9 +1820,9 @@ kvm_mips_emulate_tlbinv_st(unsigned long cause, uint32_t *opc, } /* TLBMOD: store into address matching TLB with Dirty bit off */ -enum emulation_result -kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DONE; #ifdef DEBUG @@ -1837,9 +1831,7 @@ kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); int index; - /* - * If address not in the guest TLB, then we are in trouble - */ + /* If address not in the guest TLB, then we are in trouble */ index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); if (index < 0) { /* XXXKYMA Invalidate and retry */ @@ -1856,9 +1848,10 @@ kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_tlbmod(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | @@ -1898,9 +1891,10 @@ kvm_mips_emulate_tlbmod(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_fpu_exc(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1927,9 +1921,10 @@ kvm_mips_emulate_fpu_exc(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_ri_exc(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1961,9 +1956,10 @@ kvm_mips_emulate_ri_exc(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_emulate_bp_exc(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -1995,9 +1991,7 @@ kvm_mips_emulate_bp_exc(unsigned long cause, uint32_t *opc, return er; } -/* - * ll/sc, rdhwr, sync emulation - */ +/* ll/sc, rdhwr, sync emulation */ #define OPCODE 0xfc000000 #define BASE 0x03e00000 @@ -2012,9 +2006,9 @@ kvm_mips_emulate_bp_exc(unsigned long cause, uint32_t *opc, #define SYNC 0x0000000f #define RDHWR 0x0000003b -enum emulation_result -kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; @@ -2031,9 +2025,7 @@ kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, if (er == EMULATE_FAIL) return er; - /* - * Fetch the instruction. - */ + /* Fetch the instruction. */ if (cause & CAUSEF_BD) opc += 1; @@ -2099,8 +2091,8 @@ emulate_ri: return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); } -enum emulation_result -kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run) +enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, + struct kvm_run *run) { unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; enum emulation_result er = EMULATE_DONE; @@ -2142,18 +2134,18 @@ kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run) } if (vcpu->arch.pending_load_cause & CAUSEF_BD) - kvm_debug - ("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", - vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, - vcpu->mmio_needed); + kvm_debug("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", + vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, + vcpu->mmio_needed); done: return er; } -static enum emulation_result -kvm_mips_emulate_exc(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +static enum emulation_result kvm_mips_emulate_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; struct mips_coproc *cop0 = vcpu->arch.cop0; @@ -2188,9 +2180,10 @@ kvm_mips_emulate_exc(unsigned long cause, uint32_t *opc, return er; } -enum emulation_result -kvm_mips_check_privilege(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_check_privilege(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DONE; uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; @@ -2215,7 +2208,10 @@ kvm_mips_check_privilege(unsigned long cause, uint32_t *opc, break; case T_TLB_LD_MISS: - /* We we are accessing Guest kernel space, then send an address error exception to the guest */ + /* + * We we are accessing Guest kernel space, then send an + * address error exception to the guest + */ if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { printk("%s: LD MISS @ %#lx\n", __func__, badvaddr); @@ -2226,7 +2222,10 @@ kvm_mips_check_privilege(unsigned long cause, uint32_t *opc, break; case T_TLB_ST_MISS: - /* We we are accessing Guest kernel space, then send an address error exception to the guest */ + /* + * We we are accessing Guest kernel space, then send an + * address error exception to the guest + */ if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { printk("%s: ST MISS @ %#lx\n", __func__, badvaddr); @@ -2260,21 +2259,23 @@ kvm_mips_check_privilege(unsigned long cause, uint32_t *opc, } } - if (er == EMULATE_PRIV_FAIL) { + if (er == EMULATE_PRIV_FAIL) kvm_mips_emulate_exc(cause, opc, run, vcpu); - } + return er; } -/* User Address (UA) fault, this could happen if +/* + * User Address (UA) fault, this could happen if * (1) TLB entry not present/valid in both Guest and shadow host TLBs, in this * case we pass on the fault to the guest kernel and let it handle it. * (2) TLB entry is present in the Guest TLB but not in the shadow, in this * case we inject the TLB from the Guest TLB into the shadow host TLB */ -enum emulation_result -kvm_mips_handle_tlbmiss(unsigned long cause, uint32_t *opc, - struct kvm_run *run, struct kvm_vcpu *vcpu) +enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DONE; uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; @@ -2284,10 +2285,11 @@ kvm_mips_handle_tlbmiss(unsigned long cause, uint32_t *opc, kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx, entryhi: %#lx\n", vcpu->arch.host_cp0_badvaddr, vcpu->arch.host_cp0_entryhi); - /* KVM would not have got the exception if this entry was valid in the shadow host TLB - * Check the Guest TLB, if the entry is not there then send the guest an - * exception. The guest exc handler should then inject an entry into the - * guest TLB + /* + * KVM would not have got the exception if this entry was valid in the + * shadow host TLB. Check the Guest TLB, if the entry is not there then + * send the guest an exception. The guest exc handler should then inject + * an entry into the guest TLB. */ index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) | @@ -2305,7 +2307,10 @@ kvm_mips_handle_tlbmiss(unsigned long cause, uint32_t *opc, } else { struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; - /* Check if the entry is valid, if not then setup a TLB invalid exception to the guest */ + /* + * Check if the entry is valid, if not then setup a TLB invalid + * exception to the guest + */ if (!TLB_IS_VALID(*tlb, va)) { if (exccode == T_TLB_LD_MISS) { er = kvm_mips_emulate_tlbinv_ld(cause, opc, run, @@ -2319,10 +2324,12 @@ kvm_mips_handle_tlbmiss(unsigned long cause, uint32_t *opc, er = EMULATE_FAIL; } } else { - kvm_debug - ("Injecting hi: %#lx, lo0: %#lx, lo1: %#lx into shadow host TLB\n", - tlb->tlb_hi, tlb->tlb_lo0, tlb->tlb_lo1); - /* OK we have a Guest TLB entry, now inject it into the shadow host TLB */ + kvm_debug("Injecting hi: %#lx, lo0: %#lx, lo1: %#lx into shadow host TLB\n", + tlb->tlb_hi, tlb->tlb_lo0, tlb->tlb_lo1); + /* + * OK we have a Guest TLB entry, now inject it into the + * shadow host TLB + */ kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, NULL, NULL); } diff --git a/arch/mips/kvm/kvm_mips_int.c b/arch/mips/kvm/kvm_mips_int.c index 1e5de16afe29..d458c042d558 100644 --- a/arch/mips/kvm/kvm_mips_int.c +++ b/arch/mips/kvm/kvm_mips_int.c @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: Interrupt delivery -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Interrupt delivery + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -34,7 +34,8 @@ void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, uint32_t priority) void kvm_mips_queue_timer_int_cb(struct kvm_vcpu *vcpu) { - /* Cause bits to reflect the pending timer interrupt, + /* + * Cause bits to reflect the pending timer interrupt, * the EXC code will be set when we are actually * delivering the interrupt: */ @@ -51,12 +52,13 @@ void kvm_mips_dequeue_timer_int_cb(struct kvm_vcpu *vcpu) kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER); } -void -kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq) +void kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) { int intr = (int)irq->irq; - /* Cause bits to reflect the pending IO interrupt, + /* + * Cause bits to reflect the pending IO interrupt, * the EXC code will be set when we are actually * delivering the interrupt: */ @@ -83,11 +85,11 @@ kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq) } -void -kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq) +void kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) { int intr = (int)irq->irq; + switch (intr) { case -2: kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ0)); @@ -111,9 +113,8 @@ kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, } /* Deliver the interrupt of the corresponding priority, if possible. */ -int -kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause) +int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause) { int allowed = 0; uint32_t exccode; @@ -164,7 +165,6 @@ kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, /* Are we allowed to deliver the interrupt ??? */ if (allowed) { - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { /* save old pc */ kvm_write_c0_guest_epc(cop0, arch->pc); @@ -195,9 +195,8 @@ kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, return allowed; } -int -kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause) +int kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause) { return 1; } diff --git a/arch/mips/kvm/kvm_mips_int.h b/arch/mips/kvm/kvm_mips_int.h index 20da7d29eede..4ab4bdfad703 100644 --- a/arch/mips/kvm/kvm_mips_int.h +++ b/arch/mips/kvm/kvm_mips_int.h @@ -1,14 +1,15 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: Interrupts -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Interrupts + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ -/* MIPS Exception Priorities, exceptions (including interrupts) are queued up +/* + * MIPS Exception Priorities, exceptions (including interrupts) are queued up * for the guest in the order specified by their priorities */ @@ -27,6 +28,9 @@ #define MIPS_EXC_MAX 12 /* XXXSL More to follow */ +extern char mips32_exception[], mips32_exceptionEnd[]; +extern char mips32_GuestException[], mips32_GuestExceptionEnd[]; + #define C_TI (_ULCAST_(1) << 30) #define KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE (0) diff --git a/arch/mips/kvm/kvm_mips_opcode.h b/arch/mips/kvm/kvm_mips_opcode.h index 86d3b4cc348b..03a6ae84c7df 100644 --- a/arch/mips/kvm/kvm_mips_opcode.h +++ b/arch/mips/kvm/kvm_mips_opcode.h @@ -1,24 +1,22 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ - -/* - * Define opcode values not defined in + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal */ +/* Define opcode values not defined in */ + #ifndef __KVM_MIPS_OPCODE_H__ #define __KVM_MIPS_OPCODE_H__ /* COP0 Ops */ -#define mfmcz_op 0x0b /* 01011 */ -#define wrpgpr_op 0x0e /* 01110 */ +#define mfmcz_op 0x0b /* 01011 */ +#define wrpgpr_op 0x0e /* 01110 */ -/* COP0 opcodes (only if COP0 and CO=1): */ -#define wait_op 0x20 /* 100000 */ +/* COP0 opcodes (only if COP0 and CO=1): */ +#define wait_op 0x20 /* 100000 */ #endif /* __KVM_MIPS_OPCODE_H__ */ diff --git a/arch/mips/kvm/kvm_mips_stats.c b/arch/mips/kvm/kvm_mips_stats.c index 075904bcac1b..6efef38a324d 100644 --- a/arch/mips/kvm/kvm_mips_stats.c +++ b/arch/mips/kvm/kvm_mips_stats.c @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: COP0 access histogram -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: COP0 access histogram + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c index 8a5a700ad8de..bb7418bd95b9 100644 --- a/arch/mips/kvm/kvm_tlb.c +++ b/arch/mips/kvm/kvm_tlb.c @@ -1,14 +1,14 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS TLB handling, this file is part of the Linux host kernel so that -* TLB handlers run from KSEG0 -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that + * TLB handlers run from KSEG0 + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -18,7 +18,6 @@ #include #include - #include #include #include @@ -39,13 +38,13 @@ atomic_t kvm_mips_instance; EXPORT_SYMBOL(kvm_mips_instance); /* These function pointers are initialized once the KVM module is loaded */ -pfn_t(*kvm_mips_gfn_to_pfn) (struct kvm *kvm, gfn_t gfn); +pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); EXPORT_SYMBOL(kvm_mips_gfn_to_pfn); -void (*kvm_mips_release_pfn_clean) (pfn_t pfn); +void (*kvm_mips_release_pfn_clean)(pfn_t pfn); EXPORT_SYMBOL(kvm_mips_release_pfn_clean); -bool(*kvm_mips_is_error_pfn) (pfn_t pfn); +bool (*kvm_mips_is_error_pfn)(pfn_t pfn); EXPORT_SYMBOL(kvm_mips_is_error_pfn); uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) @@ -53,21 +52,17 @@ uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK; } - uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) { return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK; } -inline uint32_t kvm_mips_get_commpage_asid (struct kvm_vcpu *vcpu) +inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) { return vcpu->kvm->arch.commpage_tlb; } - -/* - * Structure defining an tlb entry data set. - */ +/* Structure defining an tlb entry data set. */ void kvm_mips_dump_host_tlbs(void) { @@ -116,6 +111,7 @@ void kvm_mips_dump_host_tlbs(void) mtc0_tlbw_hazard(); local_irq_restore(flags); } +EXPORT_SYMBOL(kvm_mips_dump_host_tlbs); void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) { @@ -143,6 +139,7 @@ void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); } } +EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) { @@ -152,7 +149,7 @@ static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE) return 0; - srcu_idx = srcu_read_lock(&kvm->srcu); + srcu_idx = srcu_read_lock(&kvm->srcu); pfn = kvm_mips_gfn_to_pfn(kvm, gfn); if (kvm_mips_is_error_pfn(pfn)) { @@ -169,7 +166,7 @@ out: /* Translate guest KSEG0 addresses to Host PA */ unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, - unsigned long gva) + unsigned long gva) { gfn_t gfn; uint32_t offset = gva & ~PAGE_MASK; @@ -194,12 +191,13 @@ unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset; } +EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa); /* XXXKYMA: Must be called with interrupts disabled */ /* set flush_dcache_mask == 0 if no dcache flush required */ -int -kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, - unsigned long entrylo0, unsigned long entrylo1, int flush_dcache_mask) +int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, + unsigned long entrylo0, unsigned long entrylo1, + int flush_dcache_mask) { unsigned long flags; unsigned long old_entryhi; @@ -207,7 +205,6 @@ kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, local_irq_save(flags); - old_entryhi = read_c0_entryhi(); write_c0_entryhi(entryhi); mtc0_tlbw_hazard(); @@ -240,12 +237,14 @@ kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, if (flush_dcache_mask) { if (entrylo0 & MIPS3_PG_V) { ++vcpu->stat.flush_dcache_exits; - flush_data_cache_page((entryhi & VPN2_MASK) & ~flush_dcache_mask); + flush_data_cache_page((entryhi & VPN2_MASK) & + ~flush_dcache_mask); } if (entrylo1 & MIPS3_PG_V) { ++vcpu->stat.flush_dcache_exits; - flush_data_cache_page(((entryhi & VPN2_MASK) & ~flush_dcache_mask) | - (0x1 << PAGE_SHIFT)); + flush_data_cache_page(((entryhi & VPN2_MASK) & + ~flush_dcache_mask) | + (0x1 << PAGE_SHIFT)); } } @@ -257,10 +256,9 @@ kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, return 0; } - /* XXXKYMA: Must be called with interrupts disabled */ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, - struct kvm_vcpu *vcpu) + struct kvm_vcpu *vcpu) { gfn_t gfn; pfn_t pfn0, pfn1; @@ -270,7 +268,6 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, struct kvm *kvm = vcpu->kvm; const int flush_dcache_mask = 0; - if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) { kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr); kvm_mips_dump_host_tlbs(); @@ -302,14 +299,15 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, } entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu)); - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) | - (0x1 << 1); - entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) | - (0x1 << 1); + entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); + entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, flush_dcache_mask); } +EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault); int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, struct kvm_vcpu *vcpu) @@ -318,11 +316,10 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, unsigned long flags, old_entryhi = 0, vaddr = 0; unsigned long entrylo0 = 0, entrylo1 = 0; - pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; pfn1 = 0; - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) | - (0x1 << 1); + entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); entrylo1 = 0; local_irq_save(flags); @@ -341,9 +338,9 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, mtc0_tlbw_hazard(); tlbw_use_hazard(); - kvm_debug ("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", - vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), - read_c0_entrylo0(), read_c0_entrylo1()); + kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", + vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), + read_c0_entrylo0(), read_c0_entrylo1()); /* Restore old ASID */ write_c0_entryhi(old_entryhi); @@ -353,28 +350,33 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, return 0; } +EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault); -int -kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, - struct kvm_mips_tlb *tlb, unsigned long *hpa0, unsigned long *hpa1) +int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, + struct kvm_mips_tlb *tlb, + unsigned long *hpa0, + unsigned long *hpa1) { unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; struct kvm *kvm = vcpu->kvm; pfn_t pfn0, pfn1; - if ((tlb->tlb_hi & VPN2_MASK) == 0) { pfn0 = 0; pfn1 = 0; } else { - if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT) < 0) + if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) + >> PAGE_SHIFT) < 0) return -1; - if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT) < 0) + if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) + >> PAGE_SHIFT) < 0) return -1; - pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT]; - pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT]; + pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) + >> PAGE_SHIFT]; + pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) + >> PAGE_SHIFT]; } if (hpa0) @@ -385,11 +387,12 @@ kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, /* Get attributes from the Guest TLB */ entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ? - kvm_mips_get_kernel_asid(vcpu) : kvm_mips_get_user_asid(vcpu)); + kvm_mips_get_kernel_asid(vcpu) : + kvm_mips_get_user_asid(vcpu)); entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | - (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); + (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | - (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); + (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc, tlb->tlb_lo0, tlb->tlb_lo1); @@ -397,6 +400,7 @@ kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, tlb->tlb_mask); } +EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault); int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) { @@ -404,10 +408,9 @@ int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) int index = -1; struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; - for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { - if (((TLB_VPN2(tlb[i]) & ~tlb[i].tlb_mask) == ((entryhi & VPN2_MASK) & ~tlb[i].tlb_mask)) && - (TLB_IS_GLOBAL(tlb[i]) || (TLB_ASID(tlb[i]) == (entryhi & ASID_MASK)))) { + if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && + TLB_HI_ASID_HIT(tlb[i], entryhi)) { index = i; break; } @@ -418,21 +421,23 @@ int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) return index; } +EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) { unsigned long old_entryhi, flags; volatile int idx; - local_irq_save(flags); old_entryhi = read_c0_entryhi(); if (KVM_GUEST_KERNEL_MODE(vcpu)) - write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_kernel_asid(vcpu)); + write_c0_entryhi((vaddr & VPN2_MASK) | + kvm_mips_get_kernel_asid(vcpu)); else { - write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); + write_c0_entryhi((vaddr & VPN2_MASK) | + kvm_mips_get_user_asid(vcpu)); } mtc0_tlbw_hazard(); @@ -452,6 +457,7 @@ int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) return idx; } +EXPORT_SYMBOL(kvm_mips_host_tlb_lookup); int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) { @@ -460,7 +466,6 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) local_irq_save(flags); - old_entryhi = read_c0_entryhi(); write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); @@ -499,8 +504,9 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) return 0; } +EXPORT_SYMBOL(kvm_mips_host_tlb_inv); -/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID*/ +/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */ int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index) { unsigned long flags, old_entryhi; @@ -510,7 +516,6 @@ int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index) local_irq_save(flags); - old_entryhi = read_c0_entryhi(); write_c0_entryhi(UNIQUE_ENTRYHI(index)); @@ -546,7 +551,6 @@ void kvm_mips_flush_host_tlb(int skip_kseg0) int entry = 0; int maxentry = current_cpu_data.tlbsize; - local_irq_save(flags); old_entryhi = read_c0_entryhi(); @@ -554,7 +558,6 @@ void kvm_mips_flush_host_tlb(int skip_kseg0) /* Blast 'em all away. */ for (entry = 0; entry < maxentry; entry++) { - write_c0_index(entry); mtc0_tlbw_hazard(); @@ -565,9 +568,8 @@ void kvm_mips_flush_host_tlb(int skip_kseg0) entryhi = read_c0_entryhi(); /* Don't blow away guest kernel entries */ - if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) { + if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) continue; - } } /* Make sure all entries differ. */ @@ -591,17 +593,17 @@ void kvm_mips_flush_host_tlb(int skip_kseg0) local_irq_restore(flags); } +EXPORT_SYMBOL(kvm_mips_flush_host_tlb); -void -kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, - struct kvm_vcpu *vcpu) +void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, + struct kvm_vcpu *vcpu) { unsigned long asid = asid_cache(cpu); - if (!((asid += ASID_INC) & ASID_MASK)) { - if (cpu_has_vtag_icache) { + asid += ASID_INC; + if (!(asid & ASID_MASK)) { + if (cpu_has_vtag_icache) flush_icache_all(); - } kvm_local_flush_tlb_all(); /* start new asid cycle */ @@ -639,6 +641,7 @@ void kvm_local_flush_tlb_all(void) local_irq_restore(flags); } +EXPORT_SYMBOL(kvm_local_flush_tlb_all); /** * kvm_mips_migrate_count() - Migrate timer. @@ -699,7 +702,10 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) } if (!newasid) { - /* If we preempted while the guest was executing, then reload the pre-empted ASID */ + /* + * If we preempted while the guest was executing, then reload + * the pre-empted ASID + */ if (current->flags & PF_VCPU) { write_c0_entryhi(vcpu->arch. preempt_entryhi & ASID_MASK); @@ -708,9 +714,10 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) } else { /* New ASIDs were allocated for the VM */ - /* Were we in guest context? If so then the pre-empted ASID is no longer - * valid, we need to set it to what it should be based on the mode of - * the Guest (Kernel/User) + /* + * Were we in guest context? If so then the pre-empted ASID is + * no longer valid, we need to set it to what it should be based + * on the mode of the Guest (Kernel/User) */ if (current->flags & PF_VCPU) { if (KVM_GUEST_KERNEL_MODE(vcpu)) @@ -728,6 +735,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) local_irq_restore(flags); } +EXPORT_SYMBOL(kvm_arch_vcpu_load); /* ASID can change if another task is scheduled during preemption */ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) @@ -739,7 +747,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) cpu = smp_processor_id(); - vcpu->arch.preempt_entryhi = read_c0_entryhi(); vcpu->arch.last_sched_cpu = cpu; @@ -754,11 +761,12 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) local_irq_restore(flags); } +EXPORT_SYMBOL(kvm_arch_vcpu_put); uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; - unsigned long paddr, flags; + unsigned long paddr, flags, vpn2, asid; uint32_t inst; int index; @@ -769,16 +777,12 @@ uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) if (index >= 0) { inst = *(opc); } else { - index = - kvm_mips_guest_tlb_lookup(vcpu, - ((unsigned long) opc & VPN2_MASK) - | - (kvm_read_c0_guest_entryhi - (cop0) & ASID_MASK)); + vpn2 = (unsigned long) opc & VPN2_MASK; + asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK; + index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid); if (index < 0) { - kvm_err - ("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", - __func__, opc, vcpu, read_c0_entryhi()); + kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", + __func__, opc, vcpu, read_c0_entryhi()); kvm_mips_dump_host_tlbs(); local_irq_restore(flags); return KVM_INVALID_INST; @@ -793,7 +797,7 @@ uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu, - (unsigned long) opc); + (unsigned long) opc); inst = *(uint32_t *) CKSEG0ADDR(paddr); } else { kvm_err("%s: illegal address: %p\n", __func__, opc); @@ -802,18 +806,4 @@ uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) return inst; } - -EXPORT_SYMBOL(kvm_local_flush_tlb_all); -EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault); -EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault); -EXPORT_SYMBOL(kvm_mips_dump_host_tlbs); -EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault); -EXPORT_SYMBOL(kvm_mips_host_tlb_lookup); -EXPORT_SYMBOL(kvm_mips_flush_host_tlb); -EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); -EXPORT_SYMBOL(kvm_mips_host_tlb_inv); -EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa); -EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); EXPORT_SYMBOL(kvm_get_inst); -EXPORT_SYMBOL(kvm_arch_vcpu_load); -EXPORT_SYMBOL(kvm_arch_vcpu_put); diff --git a/arch/mips/kvm/kvm_trap_emul.c b/arch/mips/kvm/kvm_trap_emul.c index 693f952b2fbb..106335b36861 100644 --- a/arch/mips/kvm/kvm_trap_emul.c +++ b/arch/mips/kvm/kvm_trap_emul.c @@ -1,13 +1,13 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* KVM/MIPS: Deliver/Emulate exceptions to the guest kernel -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Deliver/Emulate exceptions to the guest kernel + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #include #include @@ -37,7 +37,6 @@ static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva) return gpa; } - static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; @@ -46,9 +45,9 @@ static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu) enum emulation_result er = EMULATE_DONE; int ret = RESUME_GUEST; - if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) { + if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) er = kvm_mips_emulate_fpu_exc(cause, opc, run, vcpu); - } else + else er = kvm_mips_emulate_inst(cause, opc, run, vcpu); switch (er) { @@ -83,9 +82,8 @@ static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu) if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { - kvm_debug - ("USER/KSEG23 ADDR TLB MOD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_debug("USER/KSEG23 ADDR TLB MOD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); er = kvm_mips_handle_tlbmod(cause, opc, run, vcpu); if (er == EMULATE_DONE) @@ -95,8 +93,10 @@ static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { - /* XXXKYMA: The guest kernel does not expect to get this fault when we are not - * using HIGHMEM. Need to address this in a HIGHMEM kernel + /* + * XXXKYMA: The guest kernel does not expect to get this fault + * when we are not using HIGHMEM. Need to address this in a + * HIGHMEM kernel */ printk ("TLB MOD fault not handled, cause %#lx, PC: %p, BadVaddr: %#lx\n", @@ -134,9 +134,8 @@ static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu) } } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { - kvm_debug - ("USER ADDR TLB LD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_debug("USER ADDR TLB LD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); if (er == EMULATE_DONE) ret = RESUME_GUEST; @@ -145,8 +144,9 @@ static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { - /* All KSEG0 faults are handled by KVM, as the guest kernel does not - * expect to ever get them + /* + * All KSEG0 faults are handled by KVM, as the guest kernel does + * not expect to ever get them */ if (kvm_mips_handle_kseg0_tlb_fault (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) { @@ -154,9 +154,8 @@ static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else { - kvm_err - ("Illegal TLB LD fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("Illegal TLB LD fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); kvm_mips_dump_host_tlbs(); kvm_arch_vcpu_dump_regs(vcpu); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; @@ -185,11 +184,14 @@ static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu) kvm_debug("USER ADDR TLB ST fault: PC: %#lx, BadVaddr: %#lx\n", vcpu->arch.pc, badvaddr); - /* User Address (UA) fault, this could happen if - * (1) TLB entry not present/valid in both Guest and shadow host TLBs, in this - * case we pass on the fault to the guest kernel and let it handle it. - * (2) TLB entry is present in the Guest TLB but not in the shadow, in this - * case we inject the TLB from the Guest TLB into the shadow host TLB + /* + * User Address (UA) fault, this could happen if + * (1) TLB entry not present/valid in both Guest and shadow host + * TLBs, in this case we pass on the fault to the guest + * kernel and let it handle it. + * (2) TLB entry is present in the Guest TLB but not in the + * shadow, in this case we inject the TLB from the Guest TLB + * into the shadow host TLB */ er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); @@ -349,9 +351,9 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) uint32_t config1; int vcpu_id = vcpu->vcpu_id; - /* Arch specific stuff, set up config registers properly so that the - * guest will come up as expected, for now we simulate a - * MIPS 24kc + /* + * Arch specific stuff, set up config registers properly so that the + * guest will come up as expected, for now we simulate a MIPS 24kc */ kvm_write_c0_guest_prid(cop0, 0x00019300); kvm_write_c0_guest_config(cop0, @@ -373,14 +375,15 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) kvm_write_c0_guest_config2(cop0, MIPS_CONFIG2); /* MIPS_CONFIG2 | (read_c0_config2() & 0xfff) */ - kvm_write_c0_guest_config3(cop0, - MIPS_CONFIG3 | (0 << CP0C3_VInt) | (1 << - CP0C3_ULRI)); + kvm_write_c0_guest_config3(cop0, MIPS_CONFIG3 | (0 << CP0C3_VInt) | + (1 << CP0C3_ULRI)); /* Set Wait IE/IXMT Ignore in Config7, IAR, AR */ kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10)); - /* Setup IntCtl defaults, compatibilty mode for timer interrupts (HW5) */ + /* + * Setup IntCtl defaults, compatibilty mode for timer interrupts (HW5) + */ kvm_write_c0_guest_intctl(cop0, 0xFC000000); /* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */ diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h index bc9e0f406c08..c1388d40663b 100644 --- a/arch/mips/kvm/trace.h +++ b/arch/mips/kvm/trace.h @@ -1,11 +1,11 @@ /* -* This file is subject to the terms and conditions of the GNU General Public -* License. See the file "COPYING" in the main directory of this archive -* for more details. -* -* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. -* Authors: Sanjay Lal -*/ + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ #if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_KVM_H @@ -17,9 +17,7 @@ #define TRACE_INCLUDE_PATH . #define TRACE_INCLUDE_FILE trace -/* - * Tracepoints for VM eists - */ +/* Tracepoints for VM eists */ extern char *kvm_mips_exit_types_str[MAX_KVM_MIPS_EXIT_TYPES]; TRACE_EVENT(kvm_exit, -- cgit v1.2.2 From 6ad78a5c75c5bcfdac4551f7d09b777b3dc3c19c Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:35 -0700 Subject: MIPS: KVM: Use KVM internal logger Replace printks with kvm_[err|info|debug]. Signed-off-by: Deng-Cheng Zhu Reviewed-by: James Hogan Signed-off-by: Paolo Bonzini --- arch/mips/kvm/kvm_mips.c | 23 ++++----- arch/mips/kvm/kvm_mips_emul.c | 107 ++++++++++++++++++++--------------------- arch/mips/kvm/kvm_mips_stats.c | 6 +-- arch/mips/kvm/kvm_tlb.c | 60 +++++++++++------------ arch/mips/kvm/kvm_trap_emul.c | 31 +++++------- 5 files changed, 110 insertions(+), 117 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c index 52be52adf030..330b3af701a6 100644 --- a/arch/mips/kvm/kvm_mips.c +++ b/arch/mips/kvm/kvm_mips.c @@ -817,8 +817,8 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) ga = memslot->base_gfn << PAGE_SHIFT; ga_end = ga + (memslot->npages << PAGE_SHIFT); - printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga, - ga_end); + kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga, + ga_end); n = kvm_dirty_bitmap_bytes(memslot); memset(memslot->dirty_bitmap, 0, n); @@ -925,24 +925,25 @@ int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) if (!vcpu) return -1; - printk("VCPU Register Dump:\n"); - printk("\tpc = 0x%08lx\n", vcpu->arch.pc); - printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); + kvm_debug("VCPU Register Dump:\n"); + kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc); + kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); for (i = 0; i < 32; i += 4) { - printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, + kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, vcpu->arch.gprs[i], vcpu->arch.gprs[i + 1], vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); } - printk("\thi: 0x%08lx\n", vcpu->arch.hi); - printk("\tlo: 0x%08lx\n", vcpu->arch.lo); + kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi); + kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo); cop0 = vcpu->arch.cop0; - printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n", - kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0)); + kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n", + kvm_read_c0_guest_status(cop0), + kvm_read_c0_guest_cause(cop0)); - printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); + kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); return 0; } diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c index 9ec9f1d54b9b..bdd1421b78fc 100644 --- a/arch/mips/kvm/kvm_mips_emul.c +++ b/arch/mips/kvm/kvm_mips_emul.c @@ -183,18 +183,18 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, /* And now the FPA/cp1 branch instructions. */ case cop1_op: - printk("%s: unsupported cop1_op\n", __func__); + kvm_err("%s: unsupported cop1_op\n", __func__); break; } return nextpc; unaligned: - printk("%s: unaligned epc\n", __func__); + kvm_err("%s: unaligned epc\n", __func__); return nextpc; sigill: - printk("%s: DSP branch but not DSP ASE\n", __func__); + kvm_err("%s: DSP branch but not DSP ASE\n", __func__); return nextpc; } @@ -751,8 +751,8 @@ enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) kvm_clear_c0_guest_status(cop0, ST0_ERL); vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); } else { - printk("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", - vcpu->arch.pc); + kvm_err("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", + vcpu->arch.pc); er = EMULATE_FAIL; } @@ -795,7 +795,7 @@ enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) enum emulation_result er = EMULATE_FAIL; uint32_t pc = vcpu->arch.pc; - printk("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); + kvm_err("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); return er; } @@ -809,13 +809,12 @@ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) uint32_t pc = vcpu->arch.pc; if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { - printk("%s: illegal index: %d\n", __func__, index); - printk - ("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), - kvm_read_c0_guest_entrylo1(cop0), - kvm_read_c0_guest_pagemask(cop0)); + kvm_debug("%s: illegal index: %d\n", __func__, index); + kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0), + kvm_read_c0_guest_pagemask(cop0)); index = (index & ~0x80000000) % KVM_MIPS_GUEST_TLB_SIZE; } @@ -853,7 +852,7 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { - printk("%s: illegal index: %d\n", __func__, index); + kvm_err("%s: illegal index: %d\n", __func__, index); return EMULATE_FAIL; } @@ -938,7 +937,7 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, er = kvm_mips_emul_tlbp(vcpu); break; case rfe_op: - printk("!!!COP0_RFE!!!\n"); + kvm_err("!!!COP0_RFE!!!\n"); break; case eret_op: er = kvm_mips_emul_eret(vcpu); @@ -987,8 +986,8 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, if ((rd == MIPS_CP0_TLB_INDEX) && (vcpu->arch.gprs[rt] >= KVM_MIPS_GUEST_TLB_SIZE)) { - printk("Invalid TLB Index: %ld", - vcpu->arch.gprs[rt]); + kvm_err("Invalid TLB Index: %ld", + vcpu->arch.gprs[rt]); er = EMULATE_FAIL; break; } @@ -998,8 +997,8 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, kvm_change_c0_guest_ebase(cop0, ~(C0_EBASE_CORE_MASK), vcpu->arch.gprs[rt]); - printk("MTCz, cop0->reg[EBASE]: %#lx\n", - kvm_read_c0_guest_ebase(cop0)); + kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n", + kvm_read_c0_guest_ebase(cop0)); } else if (rd == MIPS_CP0_TLB_HI && sel == 0) { uint32_t nasid = vcpu->arch.gprs[rt] & ASID_MASK; @@ -1072,9 +1071,8 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, break; case dmtc_op: - printk - ("!!!!!!![%#lx]dmtc_op: rt: %d, rd: %d, sel: %d!!!!!!\n", - vcpu->arch.pc, rt, rd, sel); + kvm_err("!!!!!!![%#lx]dmtc_op: rt: %d, rd: %d, sel: %d!!!!!!\n", + vcpu->arch.pc, rt, rd, sel); er = EMULATE_FAIL; break; @@ -1119,9 +1117,8 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, } break; default: - printk - ("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", - vcpu->arch.pc, copz); + kvm_err("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", + vcpu->arch.pc, copz); er = EMULATE_FAIL; break; } @@ -1242,7 +1239,7 @@ enum emulation_result kvm_mips_emulate_store(uint32_t inst, uint32_t cause, break; default: - printk("Store not yet supported"); + kvm_err("Store not yet supported"); er = EMULATE_FAIL; break; } @@ -1351,7 +1348,7 @@ enum emulation_result kvm_mips_emulate_load(uint32_t inst, uint32_t cause, break; default: - printk("Load not yet supported"); + kvm_err("Load not yet supported"); er = EMULATE_FAIL; break; } @@ -1370,7 +1367,7 @@ int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) gfn = va >> PAGE_SHIFT; if (gfn >= kvm->arch.guest_pmap_npages) { - printk("%s: Invalid gfn: %#llx\n", __func__, gfn); + kvm_err("%s: Invalid gfn: %#llx\n", __func__, gfn); kvm_mips_dump_host_tlbs(); kvm_arch_vcpu_dump_regs(vcpu); return -1; @@ -1378,7 +1375,8 @@ int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) pfn = kvm->arch.guest_pmap[gfn]; pa = (pfn << PAGE_SHIFT) | offset; - printk("%s: va: %#lx, unmapped: %#x\n", __func__, va, CKSEG0ADDR(pa)); + kvm_debug("%s: va: %#lx, unmapped: %#x\n", __func__, va, + CKSEG0ADDR(pa)); local_flush_icache_range(CKSEG0ADDR(pa), 32); return 0; @@ -1444,8 +1442,8 @@ enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, else if (cache == MIPS_CACHE_ICACHE) r4k_blast_icache(); else { - printk("%s: unsupported CACHE INDEX operation\n", - __func__); + kvm_err("%s: unsupported CACHE INDEX operation\n", + __func__); return EMULATE_FAIL; } @@ -1504,9 +1502,8 @@ enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, } } } else { - printk - ("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - cache, op, base, arch->gprs[base], offset); + kvm_err("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); er = EMULATE_FAIL; preempt_enable(); goto dont_update_pc; @@ -1536,9 +1533,8 @@ skip_fault: kvm_mips_trans_cache_va(inst, opc, vcpu); #endif } else { - printk - ("NO-OP CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - cache, op, base, arch->gprs[base], offset); + kvm_err("NO-OP CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); er = EMULATE_FAIL; preempt_enable(); goto dont_update_pc; @@ -1590,8 +1586,8 @@ enum emulation_result kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, break; default: - printk("Instruction emulation not supported (%p/%#x)\n", opc, - inst); + kvm_err("Instruction emulation not supported (%p/%#x)\n", opc, + inst); kvm_arch_vcpu_dump_regs(vcpu); er = EMULATE_FAIL; break; @@ -1628,7 +1624,7 @@ enum emulation_result kvm_mips_emulate_syscall(unsigned long cause, arch->pc = KVM_GUEST_KSEG0 + 0x180; } else { - printk("Trying to deliver SYSCALL when EXL is already set\n"); + kvm_err("Trying to deliver SYSCALL when EXL is already set\n"); er = EMULATE_FAIL; } @@ -1984,7 +1980,7 @@ enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause, arch->pc = KVM_GUEST_KSEG0 + 0x180; } else { - printk("Trying to deliver BP when EXL is already set\n"); + kvm_err("Trying to deliver BP when EXL is already set\n"); er = EMULATE_FAIL; } @@ -2032,7 +2028,7 @@ enum emulation_result kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, inst = kvm_get_inst(opc, vcpu); if (inst == KVM_INVALID_INST) { - printk("%s: Cannot get inst @ %p\n", __func__, opc); + kvm_err("%s: Cannot get inst @ %p\n", __func__, opc); return EMULATE_FAIL; } @@ -2099,7 +2095,7 @@ enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, unsigned long curr_pc; if (run->mmio.len > sizeof(*gpr)) { - printk("Bad MMIO length: %d", run->mmio.len); + kvm_err("Bad MMIO length: %d", run->mmio.len); er = EMULATE_FAIL; goto done; } @@ -2173,7 +2169,7 @@ static enum emulation_result kvm_mips_emulate_exc(unsigned long cause, exccode, kvm_read_c0_guest_epc(cop0), kvm_read_c0_guest_badvaddr(cop0)); } else { - printk("Trying to deliver EXC when EXL is already set\n"); + kvm_err("Trying to deliver EXC when EXL is already set\n"); er = EMULATE_FAIL; } @@ -2213,8 +2209,8 @@ enum emulation_result kvm_mips_check_privilege(unsigned long cause, * address error exception to the guest */ if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { - printk("%s: LD MISS @ %#lx\n", __func__, - badvaddr); + kvm_debug("%s: LD MISS @ %#lx\n", __func__, + badvaddr); cause &= ~0xff; cause |= (T_ADDR_ERR_LD << CAUSEB_EXCCODE); er = EMULATE_PRIV_FAIL; @@ -2227,8 +2223,8 @@ enum emulation_result kvm_mips_check_privilege(unsigned long cause, * address error exception to the guest */ if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { - printk("%s: ST MISS @ %#lx\n", __func__, - badvaddr); + kvm_debug("%s: ST MISS @ %#lx\n", __func__, + badvaddr); cause &= ~0xff; cause |= (T_ADDR_ERR_ST << CAUSEB_EXCCODE); er = EMULATE_PRIV_FAIL; @@ -2236,8 +2232,8 @@ enum emulation_result kvm_mips_check_privilege(unsigned long cause, break; case T_ADDR_ERR_ST: - printk("%s: address error ST @ %#lx\n", __func__, - badvaddr); + kvm_debug("%s: address error ST @ %#lx\n", __func__, + badvaddr); if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { cause &= ~0xff; cause |= (T_TLB_ST_MISS << CAUSEB_EXCCODE); @@ -2245,8 +2241,8 @@ enum emulation_result kvm_mips_check_privilege(unsigned long cause, er = EMULATE_PRIV_FAIL; break; case T_ADDR_ERR_LD: - printk("%s: address error LD @ %#lx\n", __func__, - badvaddr); + kvm_debug("%s: address error LD @ %#lx\n", __func__, + badvaddr); if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { cause &= ~0xff; cause |= (T_TLB_LD_MISS << CAUSEB_EXCCODE); @@ -2301,7 +2297,8 @@ enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, } else if (exccode == T_TLB_ST_MISS) { er = kvm_mips_emulate_tlbmiss_st(cause, opc, run, vcpu); } else { - printk("%s: invalid exc code: %d\n", __func__, exccode); + kvm_err("%s: invalid exc code: %d\n", __func__, + exccode); er = EMULATE_FAIL; } } else { @@ -2319,8 +2316,8 @@ enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, er = kvm_mips_emulate_tlbinv_st(cause, opc, run, vcpu); } else { - printk("%s: invalid exc code: %d\n", __func__, - exccode); + kvm_err("%s: invalid exc code: %d\n", __func__, + exccode); er = EMULATE_FAIL; } } else { diff --git a/arch/mips/kvm/kvm_mips_stats.c b/arch/mips/kvm/kvm_mips_stats.c index 6efef38a324d..1ae9f88b4d38 100644 --- a/arch/mips/kvm/kvm_mips_stats.c +++ b/arch/mips/kvm/kvm_mips_stats.c @@ -68,12 +68,12 @@ int kvm_mips_dump_stats(struct kvm_vcpu *vcpu) #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS int i, j; - printk("\nKVM VCPU[%d] COP0 Access Profile:\n", vcpu->vcpu_id); + kvm_info("\nKVM VCPU[%d] COP0 Access Profile:\n", vcpu->vcpu_id); for (i = 0; i < N_MIPS_COPROC_REGS; i++) { for (j = 0; j < N_MIPS_COPROC_SEL; j++) { if (vcpu->arch.cop0->stat[i][j]) - printk("%s[%d]: %lu\n", kvm_cop0_str[i], j, - vcpu->arch.cop0->stat[i][j]); + kvm_info("%s[%d]: %lu\n", kvm_cop0_str[i], j, + vcpu->arch.cop0->stat[i][j]); } } #endif diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c index bb7418bd95b9..29a5bdb19a51 100644 --- a/arch/mips/kvm/kvm_tlb.c +++ b/arch/mips/kvm/kvm_tlb.c @@ -77,8 +77,8 @@ void kvm_mips_dump_host_tlbs(void) old_entryhi = read_c0_entryhi(); old_pagemask = read_c0_pagemask(); - printk("HOST TLBs:\n"); - printk("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); + kvm_info("HOST TLBs:\n"); + kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); for (i = 0; i < current_cpu_data.tlbsize; i++) { write_c0_index(i); @@ -92,19 +92,19 @@ void kvm_mips_dump_host_tlbs(void) tlb.tlb_lo1 = read_c0_entrylo1(); tlb.tlb_mask = read_c0_pagemask(); - printk("TLB%c%3d Hi 0x%08lx ", - (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', - i, tlb.tlb_hi); - printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), - (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo0 >> 3) & 7); - printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), - (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); + kvm_info("TLB%c%3d Hi 0x%08lx ", + (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', + i, tlb.tlb_hi); + kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), + (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo0 >> 3) & 7); + kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), + (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); } write_c0_entryhi(old_entryhi); write_c0_pagemask(old_pagemask); @@ -119,24 +119,24 @@ void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) struct kvm_mips_tlb tlb; int i; - printk("Guest TLBs:\n"); - printk("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); + kvm_info("Guest TLBs:\n"); + kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { tlb = vcpu->arch.guest_tlb[i]; - printk("TLB%c%3d Hi 0x%08lx ", - (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', - i, tlb.tlb_hi); - printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), - (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo0 >> 3) & 7); - printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), - (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); + kvm_info("TLB%c%3d Hi 0x%08lx ", + (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', + i, tlb.tlb_hi); + kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), + (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo0 >> 3) & 7); + kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), + (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); } } EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); diff --git a/arch/mips/kvm/kvm_trap_emul.c b/arch/mips/kvm/kvm_trap_emul.c index 106335b36861..bd2f6bc64d45 100644 --- a/arch/mips/kvm/kvm_trap_emul.c +++ b/arch/mips/kvm/kvm_trap_emul.c @@ -27,7 +27,7 @@ static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva) if ((kseg == CKSEG0) || (kseg == CKSEG1)) gpa = CPHYSADDR(gva); else { - printk("%s: cannot find GPA for GVA: %#lx\n", __func__, gva); + kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva); kvm_mips_dump_host_tlbs(); gpa = KVM_INVALID_ADDR; } @@ -98,17 +98,15 @@ static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu) * when we are not using HIGHMEM. Need to address this in a * HIGHMEM kernel */ - printk - ("TLB MOD fault not handled, cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("TLB MOD fault not handled, cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); kvm_mips_dump_host_tlbs(); kvm_arch_vcpu_dump_regs(vcpu); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; } else { - printk - ("Illegal TLB Mod fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("Illegal TLB Mod fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); kvm_mips_dump_host_tlbs(); kvm_arch_vcpu_dump_regs(vcpu); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; @@ -208,9 +206,8 @@ static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else { - printk - ("Illegal TLB ST fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("Illegal TLB ST fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); kvm_mips_dump_host_tlbs(); kvm_arch_vcpu_dump_regs(vcpu); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; @@ -233,7 +230,7 @@ static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu) kvm_debug("Emulate Store to MMIO space\n"); er = kvm_mips_emulate_inst(cause, opc, run, vcpu); if (er == EMULATE_FAIL) { - printk("Emulate Store to MMIO space failed\n"); + kvm_err("Emulate Store to MMIO space failed\n"); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; } else { @@ -241,9 +238,8 @@ static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else { - printk - ("Address Error (STORE): cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("Address Error (STORE): cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; } @@ -263,7 +259,7 @@ static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu) kvm_debug("Emulate Load from MMIO space @ %#lx\n", badvaddr); er = kvm_mips_emulate_inst(cause, opc, run, vcpu); if (er == EMULATE_FAIL) { - printk("Emulate Load from MMIO space failed\n"); + kvm_err("Emulate Load from MMIO space failed\n"); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; } else { @@ -271,9 +267,8 @@ static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu) ret = RESUME_HOST; } } else { - printk - ("Address Error (LOAD): cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); + kvm_err("Address Error (LOAD): cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; ret = RESUME_HOST; er = EMULATE_FAIL; -- cgit v1.2.2 From d98403a525fe1648c516f33e2bf674d277d69135 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:36 -0700 Subject: MIPS: KVM: Simplify functions by removing redundancy No logic changes inside. Reviewed-by: James Hogan Signed-off-by: Deng-Cheng Zhu Signed-off-by: Paolo Bonzini --- arch/mips/kvm/kvm_mips.c | 18 ++++-------------- arch/mips/kvm/kvm_mips_commpage.c | 2 -- arch/mips/kvm/kvm_mips_emul.c | 34 +++++++++++----------------------- arch/mips/kvm/kvm_mips_stats.c | 4 +--- 4 files changed, 16 insertions(+), 42 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c index 330b3af701a6..289b4d2ae45c 100644 --- a/arch/mips/kvm/kvm_mips.c +++ b/arch/mips/kvm/kvm_mips.c @@ -97,9 +97,7 @@ void kvm_arch_hardware_unsetup(void) void kvm_arch_check_processor_compat(void *rtn) { - int *r = (int *)rtn; - *r = 0; - return; + *(int *)rtn = 0; } static void kvm_mips_init_tlbs(struct kvm *kvm) @@ -225,7 +223,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, enum kvm_mr_change change) { unsigned long npages = 0; - int i, err = 0; + int i; kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n", __func__, kvm, mem->slot, mem->guest_phys_addr, @@ -243,8 +241,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, if (!kvm->arch.guest_pmap) { kvm_err("Failed to allocate guest PMAP"); - err = -ENOMEM; - goto out; + return; } kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n", @@ -255,8 +252,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE; } } -out: - return; } void kvm_arch_flush_shadow_all(struct kvm *kvm) @@ -845,16 +840,12 @@ long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) int kvm_arch_init(void *opaque) { - int ret; - if (kvm_mips_callbacks) { kvm_err("kvm: module already exists\n"); return -EEXIST; } - ret = kvm_mips_emulation_init(&kvm_mips_callbacks); - - return ret; + return kvm_mips_emulation_init(&kvm_mips_callbacks); } void kvm_arch_exit(void) @@ -1008,7 +999,6 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) { - return; } int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, diff --git a/arch/mips/kvm/kvm_mips_commpage.c b/arch/mips/kvm/kvm_mips_commpage.c index ab7096ec0666..4b5612b34fef 100644 --- a/arch/mips/kvm/kvm_mips_commpage.c +++ b/arch/mips/kvm/kvm_mips_commpage.c @@ -33,6 +33,4 @@ void kvm_mips_commpage_init(struct kvm_vcpu *vcpu) /* Specific init values for fields */ vcpu->arch.cop0 = &page->cop0; memset(vcpu->arch.cop0, 0, sizeof(struct mips_coproc)); - - return; } diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c index bdd1421b78fc..f9b4f0fa425d 100644 --- a/arch/mips/kvm/kvm_mips_emul.c +++ b/arch/mips/kvm/kvm_mips_emul.c @@ -761,8 +761,6 @@ enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) { - enum emulation_result er = EMULATE_DONE; - kvm_debug("[%#lx] !!!WAIT!!! (%#lx)\n", vcpu->arch.pc, vcpu->arch.pending_exceptions); @@ -782,7 +780,7 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) } } - return er; + return EMULATE_DONE; } /* @@ -792,11 +790,10 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; - enum emulation_result er = EMULATE_FAIL; uint32_t pc = vcpu->arch.pc; kvm_err("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); - return er; + return EMULATE_FAIL; } /* Write Guest TLB Entry @ Index */ @@ -804,7 +801,6 @@ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; int index = kvm_read_c0_guest_index(cop0); - enum emulation_result er = EMULATE_DONE; struct kvm_mips_tlb *tlb = NULL; uint32_t pc = vcpu->arch.pc; @@ -836,14 +832,13 @@ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) kvm_read_c0_guest_entrylo1(cop0), kvm_read_c0_guest_pagemask(cop0)); - return er; + return EMULATE_DONE; } /* Write Guest TLB Entry @ Random Index */ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; - enum emulation_result er = EMULATE_DONE; struct kvm_mips_tlb *tlb = NULL; uint32_t pc = vcpu->arch.pc; int index; @@ -874,14 +869,13 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) kvm_read_c0_guest_entrylo0(cop0), kvm_read_c0_guest_entrylo1(cop0)); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; long entryhi = kvm_read_c0_guest_entryhi(cop0); - enum emulation_result er = EMULATE_DONE; uint32_t pc = vcpu->arch.pc; int index = -1; @@ -892,7 +886,7 @@ enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) kvm_debug("[%#x] COP0_TLBP (entryhi: %#lx), index: %d\n", pc, entryhi, index); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, @@ -1638,7 +1632,6 @@ enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; unsigned long entryhi = (vcpu->arch. host_cp0_badvaddr & VPN2_MASK) | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); @@ -1675,7 +1668,7 @@ enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, @@ -1685,7 +1678,6 @@ enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); @@ -1722,7 +1714,7 @@ enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, @@ -1732,7 +1724,6 @@ enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); @@ -1767,7 +1758,7 @@ enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, @@ -1777,7 +1768,6 @@ enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); @@ -1812,7 +1802,7 @@ enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); - return er; + return EMULATE_DONE; } /* TLBMOD: store into address matching TLB with Dirty bit off */ @@ -1853,7 +1843,6 @@ enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { /* save old pc */ @@ -1884,7 +1873,7 @@ enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, @@ -1894,7 +1883,6 @@ enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, { struct mips_coproc *cop0 = vcpu->arch.cop0; struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { /* save old pc */ @@ -1914,7 +1902,7 @@ enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, (T_COP_UNUSABLE << CAUSEB_EXCCODE)); kvm_change_c0_guest_cause(cop0, (CAUSEF_CE), (0x1 << CAUSEB_CE)); - return er; + return EMULATE_DONE; } enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause, diff --git a/arch/mips/kvm/kvm_mips_stats.c b/arch/mips/kvm/kvm_mips_stats.c index 1ae9f88b4d38..a74d6024c5ad 100644 --- a/arch/mips/kvm/kvm_mips_stats.c +++ b/arch/mips/kvm/kvm_mips_stats.c @@ -63,7 +63,7 @@ char *kvm_cop0_str[N_MIPS_COPROC_REGS] = { "DESAVE" }; -int kvm_mips_dump_stats(struct kvm_vcpu *vcpu) +void kvm_mips_dump_stats(struct kvm_vcpu *vcpu) { #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS int i, j; @@ -77,6 +77,4 @@ int kvm_mips_dump_stats(struct kvm_vcpu *vcpu) } } #endif - - return 0; } -- cgit v1.2.2 From b045c40620eb51fb10b19a14f9ebc118925bc0f8 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:37 -0700 Subject: MIPS: KVM: Remove unneeded volatile The keyword volatile for idx in the TLB functions is unnecessary. Reviewed-by: James Hogan Signed-off-by: Deng-Cheng Zhu Signed-off-by: Paolo Bonzini --- arch/mips/kvm/kvm_tlb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c index 29a5bdb19a51..bbcd82242059 100644 --- a/arch/mips/kvm/kvm_tlb.c +++ b/arch/mips/kvm/kvm_tlb.c @@ -201,7 +201,7 @@ int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, { unsigned long flags; unsigned long old_entryhi; - volatile int idx; + int idx; local_irq_save(flags); @@ -426,7 +426,7 @@ EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) { unsigned long old_entryhi, flags; - volatile int idx; + int idx; local_irq_save(flags); -- cgit v1.2.2 From d7d5b05faf1679849c5220627c7263b4041e15ef Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:38 -0700 Subject: MIPS: KVM: Rename files to remove the prefix "kvm_" and "kvm_mips_" Since all the files are in arch/mips/kvm/, there's no need of the prefixes "kvm_" and "kvm_mips_". Reviewed-by: James Hogan Signed-off-by: Deng-Cheng Zhu Signed-off-by: Paolo Bonzini --- arch/mips/kvm/Makefile | 8 +- arch/mips/kvm/callback.c | 14 + arch/mips/kvm/commpage.c | 36 + arch/mips/kvm/commpage.h | 24 + arch/mips/kvm/dyntrans.c | 148 +++ arch/mips/kvm/emulate.c | 2324 +++++++++++++++++++++++++++++++++++++ arch/mips/kvm/interrupt.c | 242 ++++ arch/mips/kvm/interrupt.h | 53 + arch/mips/kvm/kvm_cb.c | 14 - arch/mips/kvm/kvm_locore.S | 620 ---------- arch/mips/kvm/kvm_mips.c | 1218 ------------------- arch/mips/kvm/kvm_mips_comm.h | 24 - arch/mips/kvm/kvm_mips_commpage.c | 36 - arch/mips/kvm/kvm_mips_dyntrans.c | 148 --- arch/mips/kvm/kvm_mips_emul.c | 2324 ------------------------------------- arch/mips/kvm/kvm_mips_int.c | 242 ---- arch/mips/kvm/kvm_mips_int.h | 53 - arch/mips/kvm/kvm_mips_opcode.h | 22 - arch/mips/kvm/kvm_mips_stats.c | 80 -- arch/mips/kvm/kvm_tlb.c | 809 ------------- arch/mips/kvm/kvm_trap_emul.c | 492 -------- arch/mips/kvm/locore.S | 620 ++++++++++ arch/mips/kvm/mips.c | 1218 +++++++++++++++++++ arch/mips/kvm/opcode.h | 22 + arch/mips/kvm/stats.c | 80 ++ arch/mips/kvm/tlb.c | 809 +++++++++++++ arch/mips/kvm/trap_emul.c | 492 ++++++++ 27 files changed, 6086 insertions(+), 6086 deletions(-) create mode 100644 arch/mips/kvm/callback.c create mode 100644 arch/mips/kvm/commpage.c create mode 100644 arch/mips/kvm/commpage.h create mode 100644 arch/mips/kvm/dyntrans.c create mode 100644 arch/mips/kvm/emulate.c create mode 100644 arch/mips/kvm/interrupt.c create mode 100644 arch/mips/kvm/interrupt.h delete mode 100644 arch/mips/kvm/kvm_cb.c delete mode 100644 arch/mips/kvm/kvm_locore.S delete mode 100644 arch/mips/kvm/kvm_mips.c delete mode 100644 arch/mips/kvm/kvm_mips_comm.h delete mode 100644 arch/mips/kvm/kvm_mips_commpage.c delete mode 100644 arch/mips/kvm/kvm_mips_dyntrans.c delete mode 100644 arch/mips/kvm/kvm_mips_emul.c delete mode 100644 arch/mips/kvm/kvm_mips_int.c delete mode 100644 arch/mips/kvm/kvm_mips_int.h delete mode 100644 arch/mips/kvm/kvm_mips_opcode.h delete mode 100644 arch/mips/kvm/kvm_mips_stats.c delete mode 100644 arch/mips/kvm/kvm_tlb.c delete mode 100644 arch/mips/kvm/kvm_trap_emul.c create mode 100644 arch/mips/kvm/locore.S create mode 100644 arch/mips/kvm/mips.c create mode 100644 arch/mips/kvm/opcode.h create mode 100644 arch/mips/kvm/stats.c create mode 100644 arch/mips/kvm/tlb.c create mode 100644 arch/mips/kvm/trap_emul.c (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile index 78d87bbc99db..401fe027c261 100644 --- a/arch/mips/kvm/Makefile +++ b/arch/mips/kvm/Makefile @@ -5,9 +5,9 @@ common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o) EXTRA_CFLAGS += -Ivirt/kvm -Iarch/mips/kvm -kvm-objs := $(common-objs) kvm_mips.o kvm_mips_emul.o kvm_locore.o \ - kvm_mips_int.o kvm_mips_stats.o kvm_mips_commpage.o \ - kvm_mips_dyntrans.o kvm_trap_emul.o +kvm-objs := $(common-objs) mips.o emulate.o locore.o \ + interrupt.o stats.o commpage.o \ + dyntrans.o trap_emul.o obj-$(CONFIG_KVM) += kvm.o -obj-y += kvm_cb.o kvm_tlb.o +obj-y += callback.o tlb.o diff --git a/arch/mips/kvm/callback.c b/arch/mips/kvm/callback.c new file mode 100644 index 000000000000..313c2e37b978 --- /dev/null +++ b/arch/mips/kvm/callback.c @@ -0,0 +1,14 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Yann Le Du + */ + +#include +#include + +struct kvm_mips_callbacks *kvm_mips_callbacks; +EXPORT_SYMBOL(kvm_mips_callbacks); diff --git a/arch/mips/kvm/commpage.c b/arch/mips/kvm/commpage.c new file mode 100644 index 000000000000..61b9c043ea09 --- /dev/null +++ b/arch/mips/kvm/commpage.c @@ -0,0 +1,36 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * commpage, currently used for Virtual COP0 registers. + * Mapped into the guest kernel @ 0x0. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "commpage.h" + +void kvm_mips_commpage_init(struct kvm_vcpu *vcpu) +{ + struct kvm_mips_commpage *page = vcpu->arch.kseg0_commpage; + + memset(page, 0, sizeof(struct kvm_mips_commpage)); + + /* Specific init values for fields */ + vcpu->arch.cop0 = &page->cop0; + memset(vcpu->arch.cop0, 0, sizeof(struct mips_coproc)); +} diff --git a/arch/mips/kvm/commpage.h b/arch/mips/kvm/commpage.h new file mode 100644 index 000000000000..08c5fa2bbc0f --- /dev/null +++ b/arch/mips/kvm/commpage.h @@ -0,0 +1,24 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: commpage: mapped into get kernel space + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#ifndef __KVM_MIPS_COMMPAGE_H__ +#define __KVM_MIPS_COMMPAGE_H__ + +struct kvm_mips_commpage { + /* COP0 state is mapped into Guest kernel via commpage */ + struct mips_coproc cop0; +}; + +#define KVM_MIPS_COMM_EIDI_OFFSET 0x0 + +extern void kvm_mips_commpage_init(struct kvm_vcpu *vcpu); + +#endif /* __KVM_MIPS_COMMPAGE_H__ */ diff --git a/arch/mips/kvm/dyntrans.c b/arch/mips/kvm/dyntrans.c new file mode 100644 index 000000000000..521121bdebff --- /dev/null +++ b/arch/mips/kvm/dyntrans.c @@ -0,0 +1,148 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Binary Patching for privileged instructions, reduces traps. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "commpage.h" + +#define SYNCI_TEMPLATE 0x041f0000 +#define SYNCI_BASE(x) (((x) >> 21) & 0x1f) +#define SYNCI_OFFSET ((x) & 0xffff) + +#define LW_TEMPLATE 0x8c000000 +#define CLEAR_TEMPLATE 0x00000020 +#define SW_TEMPLATE 0xac000000 + +int kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc, + struct kvm_vcpu *vcpu) +{ + int result = 0; + unsigned long kseg0_opc; + uint32_t synci_inst = 0x0; + + /* Replace the CACHE instruction, with a NOP */ + kseg0_opc = + CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa + (vcpu, (unsigned long) opc)); + memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t)); + local_flush_icache_range(kseg0_opc, kseg0_opc + 32); + + return result; +} + +/* + * Address based CACHE instructions are transformed into synci(s). A little + * heavy for just D-cache invalidates, but avoids an expensive trap + */ +int kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc, + struct kvm_vcpu *vcpu) +{ + int result = 0; + unsigned long kseg0_opc; + uint32_t synci_inst = SYNCI_TEMPLATE, base, offset; + + base = (inst >> 21) & 0x1f; + offset = inst & 0xffff; + synci_inst |= (base << 21); + synci_inst |= offset; + + kseg0_opc = + CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa + (vcpu, (unsigned long) opc)); + memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t)); + local_flush_icache_range(kseg0_opc, kseg0_opc + 32); + + return result; +} + +int kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) +{ + int32_t rt, rd, sel; + uint32_t mfc0_inst; + unsigned long kseg0_opc, flags; + + rt = (inst >> 16) & 0x1f; + rd = (inst >> 11) & 0x1f; + sel = inst & 0x7; + + if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { + mfc0_inst = CLEAR_TEMPLATE; + mfc0_inst |= ((rt & 0x1f) << 16); + } else { + mfc0_inst = LW_TEMPLATE; + mfc0_inst |= ((rt & 0x1f) << 16); + mfc0_inst |= + offsetof(struct mips_coproc, + reg[rd][sel]) + offsetof(struct kvm_mips_commpage, + cop0); + } + + if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { + kseg0_opc = + CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa + (vcpu, (unsigned long) opc)); + memcpy((void *)kseg0_opc, (void *)&mfc0_inst, sizeof(uint32_t)); + local_flush_icache_range(kseg0_opc, kseg0_opc + 32); + } else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { + local_irq_save(flags); + memcpy((void *)opc, (void *)&mfc0_inst, sizeof(uint32_t)); + local_flush_icache_range((unsigned long)opc, + (unsigned long)opc + 32); + local_irq_restore(flags); + } else { + kvm_err("%s: Invalid address: %p\n", __func__, opc); + return -EFAULT; + } + + return 0; +} + +int kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) +{ + int32_t rt, rd, sel; + uint32_t mtc0_inst = SW_TEMPLATE; + unsigned long kseg0_opc, flags; + + rt = (inst >> 16) & 0x1f; + rd = (inst >> 11) & 0x1f; + sel = inst & 0x7; + + mtc0_inst |= ((rt & 0x1f) << 16); + mtc0_inst |= + offsetof(struct mips_coproc, + reg[rd][sel]) + offsetof(struct kvm_mips_commpage, cop0); + + if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { + kseg0_opc = + CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa + (vcpu, (unsigned long) opc)); + memcpy((void *)kseg0_opc, (void *)&mtc0_inst, sizeof(uint32_t)); + local_flush_icache_range(kseg0_opc, kseg0_opc + 32); + } else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { + local_irq_save(flags); + memcpy((void *)opc, (void *)&mtc0_inst, sizeof(uint32_t)); + local_flush_icache_range((unsigned long)opc, + (unsigned long)opc + 32); + local_irq_restore(flags); + } else { + kvm_err("%s: Invalid address: %p\n", __func__, opc); + return -EFAULT; + } + + return 0; +} diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c new file mode 100644 index 000000000000..1a6068892e66 --- /dev/null +++ b/arch/mips/kvm/emulate.c @@ -0,0 +1,2324 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Instruction/Exception emulation + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#undef CONFIG_MIPS_MT +#include +#define CONFIG_MIPS_MT + +#include "opcode.h" +#include "interrupt.h" +#include "commpage.h" + +#include "trace.h" + +/* + * Compute the return address and do emulate branch simulation, if required. + * This function should be called only in branch delay slot active. + */ +unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, + unsigned long instpc) +{ + unsigned int dspcontrol; + union mips_instruction insn; + struct kvm_vcpu_arch *arch = &vcpu->arch; + long epc = instpc; + long nextpc = KVM_INVALID_INST; + + if (epc & 3) + goto unaligned; + + /* Read the instruction */ + insn.word = kvm_get_inst((uint32_t *) epc, vcpu); + + if (insn.word == KVM_INVALID_INST) + return KVM_INVALID_INST; + + switch (insn.i_format.opcode) { + /* jr and jalr are in r_format format. */ + case spec_op: + switch (insn.r_format.func) { + case jalr_op: + arch->gprs[insn.r_format.rd] = epc + 8; + /* Fall through */ + case jr_op: + nextpc = arch->gprs[insn.r_format.rs]; + break; + } + break; + + /* + * This group contains: + * bltz_op, bgez_op, bltzl_op, bgezl_op, + * bltzal_op, bgezal_op, bltzall_op, bgezall_op. + */ + case bcond_op: + switch (insn.i_format.rt) { + case bltz_op: + case bltzl_op: + if ((long)arch->gprs[insn.i_format.rs] < 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case bgez_op: + case bgezl_op: + if ((long)arch->gprs[insn.i_format.rs] >= 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case bltzal_op: + case bltzall_op: + arch->gprs[31] = epc + 8; + if ((long)arch->gprs[insn.i_format.rs] < 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case bgezal_op: + case bgezall_op: + arch->gprs[31] = epc + 8; + if ((long)arch->gprs[insn.i_format.rs] >= 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + case bposge32_op: + if (!cpu_has_dsp) + goto sigill; + + dspcontrol = rddsp(0x01); + + if (dspcontrol >= 32) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + } + break; + + /* These are unconditional and in j_format. */ + case jal_op: + arch->gprs[31] = instpc + 8; + case j_op: + epc += 4; + epc >>= 28; + epc <<= 28; + epc |= (insn.j_format.target << 2); + nextpc = epc; + break; + + /* These are conditional and in i_format. */ + case beq_op: + case beql_op: + if (arch->gprs[insn.i_format.rs] == + arch->gprs[insn.i_format.rt]) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case bne_op: + case bnel_op: + if (arch->gprs[insn.i_format.rs] != + arch->gprs[insn.i_format.rt]) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case blez_op: /* not really i_format */ + case blezl_op: + /* rt field assumed to be zero */ + if ((long)arch->gprs[insn.i_format.rs] <= 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + case bgtz_op: + case bgtzl_op: + /* rt field assumed to be zero */ + if ((long)arch->gprs[insn.i_format.rs] > 0) + epc = epc + 4 + (insn.i_format.simmediate << 2); + else + epc += 8; + nextpc = epc; + break; + + /* And now the FPA/cp1 branch instructions. */ + case cop1_op: + kvm_err("%s: unsupported cop1_op\n", __func__); + break; + } + + return nextpc; + +unaligned: + kvm_err("%s: unaligned epc\n", __func__); + return nextpc; + +sigill: + kvm_err("%s: DSP branch but not DSP ASE\n", __func__); + return nextpc; +} + +enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause) +{ + unsigned long branch_pc; + enum emulation_result er = EMULATE_DONE; + + if (cause & CAUSEF_BD) { + branch_pc = kvm_compute_return_epc(vcpu, vcpu->arch.pc); + if (branch_pc == KVM_INVALID_INST) { + er = EMULATE_FAIL; + } else { + vcpu->arch.pc = branch_pc; + kvm_debug("BD update_pc(): New PC: %#lx\n", + vcpu->arch.pc); + } + } else + vcpu->arch.pc += 4; + + kvm_debug("update_pc(): New PC: %#lx\n", vcpu->arch.pc); + + return er; +} + +/** + * kvm_mips_count_disabled() - Find whether the CP0_Count timer is disabled. + * @vcpu: Virtual CPU. + * + * Returns: 1 if the CP0_Count timer is disabled by either the guest + * CP0_Cause.DC bit or the count_ctl.DC bit. + * 0 otherwise (in which case CP0_Count timer is running). + */ +static inline int kvm_mips_count_disabled(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + + return (vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) || + (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC); +} + +/** + * kvm_mips_ktime_to_count() - Scale ktime_t to a 32-bit count. + * + * Caches the dynamic nanosecond bias in vcpu->arch.count_dyn_bias. + * + * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). + */ +static uint32_t kvm_mips_ktime_to_count(struct kvm_vcpu *vcpu, ktime_t now) +{ + s64 now_ns, periods; + u64 delta; + + now_ns = ktime_to_ns(now); + delta = now_ns + vcpu->arch.count_dyn_bias; + + if (delta >= vcpu->arch.count_period) { + /* If delta is out of safe range the bias needs adjusting */ + periods = div64_s64(now_ns, vcpu->arch.count_period); + vcpu->arch.count_dyn_bias = -periods * vcpu->arch.count_period; + /* Recalculate delta with new bias */ + delta = now_ns + vcpu->arch.count_dyn_bias; + } + + /* + * We've ensured that: + * delta < count_period + * + * Therefore the intermediate delta*count_hz will never overflow since + * at the boundary condition: + * delta = count_period + * delta = NSEC_PER_SEC * 2^32 / count_hz + * delta * count_hz = NSEC_PER_SEC * 2^32 + */ + return div_u64(delta * vcpu->arch.count_hz, NSEC_PER_SEC); +} + +/** + * kvm_mips_count_time() - Get effective current time. + * @vcpu: Virtual CPU. + * + * Get effective monotonic ktime. This is usually a straightforward ktime_get(), + * except when the master disable bit is set in count_ctl, in which case it is + * count_resume, i.e. the time that the count was disabled. + * + * Returns: Effective monotonic ktime for CP0_Count. + */ +static inline ktime_t kvm_mips_count_time(struct kvm_vcpu *vcpu) +{ + if (unlikely(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) + return vcpu->arch.count_resume; + + return ktime_get(); +} + +/** + * kvm_mips_read_count_running() - Read the current count value as if running. + * @vcpu: Virtual CPU. + * @now: Kernel time to read CP0_Count at. + * + * Returns the current guest CP0_Count register at time @now and handles if the + * timer interrupt is pending and hasn't been handled yet. + * + * Returns: The current value of the guest CP0_Count register. + */ +static uint32_t kvm_mips_read_count_running(struct kvm_vcpu *vcpu, ktime_t now) +{ + ktime_t expires; + int running; + + /* Is the hrtimer pending? */ + expires = hrtimer_get_expires(&vcpu->arch.comparecount_timer); + if (ktime_compare(now, expires) >= 0) { + /* + * Cancel it while we handle it so there's no chance of + * interference with the timeout handler. + */ + running = hrtimer_cancel(&vcpu->arch.comparecount_timer); + + /* Nothing should be waiting on the timeout */ + kvm_mips_callbacks->queue_timer_int(vcpu); + + /* + * Restart the timer if it was running based on the expiry time + * we read, so that we don't push it back 2 periods. + */ + if (running) { + expires = ktime_add_ns(expires, + vcpu->arch.count_period); + hrtimer_start(&vcpu->arch.comparecount_timer, expires, + HRTIMER_MODE_ABS); + } + } + + /* Return the biased and scaled guest CP0_Count */ + return vcpu->arch.count_bias + kvm_mips_ktime_to_count(vcpu, now); +} + +/** + * kvm_mips_read_count() - Read the current count value. + * @vcpu: Virtual CPU. + * + * Read the current guest CP0_Count value, taking into account whether the timer + * is stopped. + * + * Returns: The current guest CP0_Count value. + */ +uint32_t kvm_mips_read_count(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + + /* If count disabled just read static copy of count */ + if (kvm_mips_count_disabled(vcpu)) + return kvm_read_c0_guest_count(cop0); + + return kvm_mips_read_count_running(vcpu, ktime_get()); +} + +/** + * kvm_mips_freeze_hrtimer() - Safely stop the hrtimer. + * @vcpu: Virtual CPU. + * @count: Output pointer for CP0_Count value at point of freeze. + * + * Freeze the hrtimer safely and return both the ktime and the CP0_Count value + * at the point it was frozen. It is guaranteed that any pending interrupts at + * the point it was frozen are handled, and none after that point. + * + * This is useful where the time/CP0_Count is needed in the calculation of the + * new parameters. + * + * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). + * + * Returns: The ktime at the point of freeze. + */ +static ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, + uint32_t *count) +{ + ktime_t now; + + /* stop hrtimer before finding time */ + hrtimer_cancel(&vcpu->arch.comparecount_timer); + now = ktime_get(); + + /* find count at this point and handle pending hrtimer */ + *count = kvm_mips_read_count_running(vcpu, now); + + return now; +} + +/** + * kvm_mips_resume_hrtimer() - Resume hrtimer, updating expiry. + * @vcpu: Virtual CPU. + * @now: ktime at point of resume. + * @count: CP0_Count at point of resume. + * + * Resumes the timer and updates the timer expiry based on @now and @count. + * This can be used in conjunction with kvm_mips_freeze_timer() when timer + * parameters need to be changed. + * + * It is guaranteed that a timer interrupt immediately after resume will be + * handled, but not if CP_Compare is exactly at @count. That case is already + * handled by kvm_mips_freeze_timer(). + * + * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). + */ +static void kvm_mips_resume_hrtimer(struct kvm_vcpu *vcpu, + ktime_t now, uint32_t count) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + uint32_t compare; + u64 delta; + ktime_t expire; + + /* Calculate timeout (wrap 0 to 2^32) */ + compare = kvm_read_c0_guest_compare(cop0); + delta = (u64)(uint32_t)(compare - count - 1) + 1; + delta = div_u64(delta * NSEC_PER_SEC, vcpu->arch.count_hz); + expire = ktime_add_ns(now, delta); + + /* Update hrtimer to use new timeout */ + hrtimer_cancel(&vcpu->arch.comparecount_timer); + hrtimer_start(&vcpu->arch.comparecount_timer, expire, HRTIMER_MODE_ABS); +} + +/** + * kvm_mips_update_hrtimer() - Update next expiry time of hrtimer. + * @vcpu: Virtual CPU. + * + * Recalculates and updates the expiry time of the hrtimer. This can be used + * after timer parameters have been altered which do not depend on the time that + * the change occurs (in those cases kvm_mips_freeze_hrtimer() and + * kvm_mips_resume_hrtimer() are used directly). + * + * It is guaranteed that no timer interrupts will be lost in the process. + * + * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). + */ +static void kvm_mips_update_hrtimer(struct kvm_vcpu *vcpu) +{ + ktime_t now; + uint32_t count; + + /* + * freeze_hrtimer takes care of a timer interrupts <= count, and + * resume_hrtimer the hrtimer takes care of a timer interrupts > count. + */ + now = kvm_mips_freeze_hrtimer(vcpu, &count); + kvm_mips_resume_hrtimer(vcpu, now, count); +} + +/** + * kvm_mips_write_count() - Modify the count and update timer. + * @vcpu: Virtual CPU. + * @count: Guest CP0_Count value to set. + * + * Sets the CP0_Count value and updates the timer accordingly. + */ +void kvm_mips_write_count(struct kvm_vcpu *vcpu, uint32_t count) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + ktime_t now; + + /* Calculate bias */ + now = kvm_mips_count_time(vcpu); + vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); + + if (kvm_mips_count_disabled(vcpu)) + /* The timer's disabled, adjust the static count */ + kvm_write_c0_guest_count(cop0, count); + else + /* Update timeout */ + kvm_mips_resume_hrtimer(vcpu, now, count); +} + +/** + * kvm_mips_init_count() - Initialise timer. + * @vcpu: Virtual CPU. + * + * Initialise the timer to a sensible frequency, namely 100MHz, zero it, and set + * it going if it's enabled. + */ +void kvm_mips_init_count(struct kvm_vcpu *vcpu) +{ + /* 100 MHz */ + vcpu->arch.count_hz = 100*1000*1000; + vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, + vcpu->arch.count_hz); + vcpu->arch.count_dyn_bias = 0; + + /* Starting at 0 */ + kvm_mips_write_count(vcpu, 0); +} + +/** + * kvm_mips_set_count_hz() - Update the frequency of the timer. + * @vcpu: Virtual CPU. + * @count_hz: Frequency of CP0_Count timer in Hz. + * + * Change the frequency of the CP0_Count timer. This is done atomically so that + * CP0_Count is continuous and no timer interrupt is lost. + * + * Returns: -EINVAL if @count_hz is out of range. + * 0 on success. + */ +int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + int dc; + ktime_t now; + u32 count; + + /* ensure the frequency is in a sensible range... */ + if (count_hz <= 0 || count_hz > NSEC_PER_SEC) + return -EINVAL; + /* ... and has actually changed */ + if (vcpu->arch.count_hz == count_hz) + return 0; + + /* Safely freeze timer so we can keep it continuous */ + dc = kvm_mips_count_disabled(vcpu); + if (dc) { + now = kvm_mips_count_time(vcpu); + count = kvm_read_c0_guest_count(cop0); + } else { + now = kvm_mips_freeze_hrtimer(vcpu, &count); + } + + /* Update the frequency */ + vcpu->arch.count_hz = count_hz; + vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, count_hz); + vcpu->arch.count_dyn_bias = 0; + + /* Calculate adjusted bias so dynamic count is unchanged */ + vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); + + /* Update and resume hrtimer */ + if (!dc) + kvm_mips_resume_hrtimer(vcpu, now, count); + return 0; +} + +/** + * kvm_mips_write_compare() - Modify compare and update timer. + * @vcpu: Virtual CPU. + * @compare: New CP0_Compare value. + * + * Update CP0_Compare to a new value and update the timeout. + */ +void kvm_mips_write_compare(struct kvm_vcpu *vcpu, uint32_t compare) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + + /* if unchanged, must just be an ack */ + if (kvm_read_c0_guest_compare(cop0) == compare) + return; + + /* Update compare */ + kvm_write_c0_guest_compare(cop0, compare); + + /* Update timeout if count enabled */ + if (!kvm_mips_count_disabled(vcpu)) + kvm_mips_update_hrtimer(vcpu); +} + +/** + * kvm_mips_count_disable() - Disable count. + * @vcpu: Virtual CPU. + * + * Disable the CP0_Count timer. A timer interrupt on or before the final stop + * time will be handled but not after. + * + * Assumes CP0_Count was previously enabled but now Guest.CP0_Cause.DC or + * count_ctl.DC has been set (count disabled). + * + * Returns: The time that the timer was stopped. + */ +static ktime_t kvm_mips_count_disable(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + uint32_t count; + ktime_t now; + + /* Stop hrtimer */ + hrtimer_cancel(&vcpu->arch.comparecount_timer); + + /* Set the static count from the dynamic count, handling pending TI */ + now = ktime_get(); + count = kvm_mips_read_count_running(vcpu, now); + kvm_write_c0_guest_count(cop0, count); + + return now; +} + +/** + * kvm_mips_count_disable_cause() - Disable count using CP0_Cause.DC. + * @vcpu: Virtual CPU. + * + * Disable the CP0_Count timer and set CP0_Cause.DC. A timer interrupt on or + * before the final stop time will be handled if the timer isn't disabled by + * count_ctl.DC, but not after. + * + * Assumes CP0_Cause.DC is clear (count enabled). + */ +void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + + kvm_set_c0_guest_cause(cop0, CAUSEF_DC); + if (!(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) + kvm_mips_count_disable(vcpu); +} + +/** + * kvm_mips_count_enable_cause() - Enable count using CP0_Cause.DC. + * @vcpu: Virtual CPU. + * + * Enable the CP0_Count timer and clear CP0_Cause.DC. A timer interrupt after + * the start time will be handled if the timer isn't disabled by count_ctl.DC, + * potentially before even returning, so the caller should be careful with + * ordering of CP0_Cause modifications so as not to lose it. + * + * Assumes CP0_Cause.DC is set (count disabled). + */ +void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + uint32_t count; + + kvm_clear_c0_guest_cause(cop0, CAUSEF_DC); + + /* + * Set the dynamic count to match the static count. + * This starts the hrtimer if count_ctl.DC allows it. + * Otherwise it conveniently updates the biases. + */ + count = kvm_read_c0_guest_count(cop0); + kvm_mips_write_count(vcpu, count); +} + +/** + * kvm_mips_set_count_ctl() - Update the count control KVM register. + * @vcpu: Virtual CPU. + * @count_ctl: Count control register new value. + * + * Set the count control KVM register. The timer is updated accordingly. + * + * Returns: -EINVAL if reserved bits are set. + * 0 on success. + */ +int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + s64 changed = count_ctl ^ vcpu->arch.count_ctl; + s64 delta; + ktime_t expire, now; + uint32_t count, compare; + + /* Only allow defined bits to be changed */ + if (changed & ~(s64)(KVM_REG_MIPS_COUNT_CTL_DC)) + return -EINVAL; + + /* Apply new value */ + vcpu->arch.count_ctl = count_ctl; + + /* Master CP0_Count disable */ + if (changed & KVM_REG_MIPS_COUNT_CTL_DC) { + /* Is CP0_Cause.DC already disabling CP0_Count? */ + if (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC) { + if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) + /* Just record the current time */ + vcpu->arch.count_resume = ktime_get(); + } else if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) { + /* disable timer and record current time */ + vcpu->arch.count_resume = kvm_mips_count_disable(vcpu); + } else { + /* + * Calculate timeout relative to static count at resume + * time (wrap 0 to 2^32). + */ + count = kvm_read_c0_guest_count(cop0); + compare = kvm_read_c0_guest_compare(cop0); + delta = (u64)(uint32_t)(compare - count - 1) + 1; + delta = div_u64(delta * NSEC_PER_SEC, + vcpu->arch.count_hz); + expire = ktime_add_ns(vcpu->arch.count_resume, delta); + + /* Handle pending interrupt */ + now = ktime_get(); + if (ktime_compare(now, expire) >= 0) + /* Nothing should be waiting on the timeout */ + kvm_mips_callbacks->queue_timer_int(vcpu); + + /* Resume hrtimer without changing bias */ + count = kvm_mips_read_count_running(vcpu, now); + kvm_mips_resume_hrtimer(vcpu, now, count); + } + } + + return 0; +} + +/** + * kvm_mips_set_count_resume() - Update the count resume KVM register. + * @vcpu: Virtual CPU. + * @count_resume: Count resume register new value. + * + * Set the count resume KVM register. + * + * Returns: -EINVAL if out of valid range (0..now). + * 0 on success. + */ +int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume) +{ + /* + * It doesn't make sense for the resume time to be in the future, as it + * would be possible for the next interrupt to be more than a full + * period in the future. + */ + if (count_resume < 0 || count_resume > ktime_to_ns(ktime_get())) + return -EINVAL; + + vcpu->arch.count_resume = ns_to_ktime(count_resume); + return 0; +} + +/** + * kvm_mips_count_timeout() - Push timer forward on timeout. + * @vcpu: Virtual CPU. + * + * Handle an hrtimer event by push the hrtimer forward a period. + * + * Returns: The hrtimer_restart value to return to the hrtimer subsystem. + */ +enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu) +{ + /* Add the Count period to the current expiry time */ + hrtimer_add_expires_ns(&vcpu->arch.comparecount_timer, + vcpu->arch.count_period); + return HRTIMER_RESTART; +} + +enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + enum emulation_result er = EMULATE_DONE; + + if (kvm_read_c0_guest_status(cop0) & ST0_EXL) { + kvm_debug("[%#lx] ERET to %#lx\n", vcpu->arch.pc, + kvm_read_c0_guest_epc(cop0)); + kvm_clear_c0_guest_status(cop0, ST0_EXL); + vcpu->arch.pc = kvm_read_c0_guest_epc(cop0); + + } else if (kvm_read_c0_guest_status(cop0) & ST0_ERL) { + kvm_clear_c0_guest_status(cop0, ST0_ERL); + vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); + } else { + kvm_err("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", + vcpu->arch.pc); + er = EMULATE_FAIL; + } + + return er; +} + +enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) +{ + kvm_debug("[%#lx] !!!WAIT!!! (%#lx)\n", vcpu->arch.pc, + vcpu->arch.pending_exceptions); + + ++vcpu->stat.wait_exits; + trace_kvm_exit(vcpu, WAIT_EXITS); + if (!vcpu->arch.pending_exceptions) { + vcpu->arch.wait = 1; + kvm_vcpu_block(vcpu); + + /* + * We we are runnable, then definitely go off to user space to + * check if any I/O interrupts are pending. + */ + if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) { + clear_bit(KVM_REQ_UNHALT, &vcpu->requests); + vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; + } + } + + return EMULATE_DONE; +} + +/* + * XXXKYMA: Linux doesn't seem to use TLBR, return EMULATE_FAIL for now so that + * we can catch this, if things ever change + */ +enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + uint32_t pc = vcpu->arch.pc; + + kvm_err("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); + return EMULATE_FAIL; +} + +/* Write Guest TLB Entry @ Index */ +enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + int index = kvm_read_c0_guest_index(cop0); + struct kvm_mips_tlb *tlb = NULL; + uint32_t pc = vcpu->arch.pc; + + if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { + kvm_debug("%s: illegal index: %d\n", __func__, index); + kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0), + kvm_read_c0_guest_pagemask(cop0)); + index = (index & ~0x80000000) % KVM_MIPS_GUEST_TLB_SIZE; + } + + tlb = &vcpu->arch.guest_tlb[index]; + /* + * Probe the shadow host TLB for the entry being overwritten, if one + * matches, invalidate it + */ + kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); + + tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); + tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); + tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); + tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); + + kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0), + kvm_read_c0_guest_pagemask(cop0)); + + return EMULATE_DONE; +} + +/* Write Guest TLB Entry @ Random Index */ +enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_mips_tlb *tlb = NULL; + uint32_t pc = vcpu->arch.pc; + int index; + + get_random_bytes(&index, sizeof(index)); + index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); + + if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { + kvm_err("%s: illegal index: %d\n", __func__, index); + return EMULATE_FAIL; + } + + tlb = &vcpu->arch.guest_tlb[index]; + + /* + * Probe the shadow host TLB for the entry being overwritten, if one + * matches, invalidate it + */ + kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); + + tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); + tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); + tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); + tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); + + kvm_debug("[%#x] COP0_TLBWR[%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx)\n", + pc, index, kvm_read_c0_guest_entryhi(cop0), + kvm_read_c0_guest_entrylo0(cop0), + kvm_read_c0_guest_entrylo1(cop0)); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + long entryhi = kvm_read_c0_guest_entryhi(cop0); + uint32_t pc = vcpu->arch.pc; + int index = -1; + + index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); + + kvm_write_c0_guest_index(cop0, index); + + kvm_debug("[%#x] COP0_TLBP (entryhi: %#lx), index: %d\n", pc, entryhi, + index); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, + uint32_t cause, struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + enum emulation_result er = EMULATE_DONE; + int32_t rt, rd, copz, sel, co_bit, op; + uint32_t pc = vcpu->arch.pc; + unsigned long curr_pc; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + copz = (inst >> 21) & 0x1f; + rt = (inst >> 16) & 0x1f; + rd = (inst >> 11) & 0x1f; + sel = inst & 0x7; + co_bit = (inst >> 25) & 1; + + if (co_bit) { + op = (inst) & 0xff; + + switch (op) { + case tlbr_op: /* Read indexed TLB entry */ + er = kvm_mips_emul_tlbr(vcpu); + break; + case tlbwi_op: /* Write indexed */ + er = kvm_mips_emul_tlbwi(vcpu); + break; + case tlbwr_op: /* Write random */ + er = kvm_mips_emul_tlbwr(vcpu); + break; + case tlbp_op: /* TLB Probe */ + er = kvm_mips_emul_tlbp(vcpu); + break; + case rfe_op: + kvm_err("!!!COP0_RFE!!!\n"); + break; + case eret_op: + er = kvm_mips_emul_eret(vcpu); + goto dont_update_pc; + break; + case wait_op: + er = kvm_mips_emul_wait(vcpu); + break; + } + } else { + switch (copz) { + case mfc_op: +#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS + cop0->stat[rd][sel]++; +#endif + /* Get reg */ + if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { + vcpu->arch.gprs[rt] = kvm_mips_read_count(vcpu); + } else if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { + vcpu->arch.gprs[rt] = 0x0; +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + kvm_mips_trans_mfc0(inst, opc, vcpu); +#endif + } else { + vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; + +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + kvm_mips_trans_mfc0(inst, opc, vcpu); +#endif + } + + kvm_debug + ("[%#x] MFCz[%d][%d], vcpu->arch.gprs[%d]: %#lx\n", + pc, rd, sel, rt, vcpu->arch.gprs[rt]); + + break; + + case dmfc_op: + vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; + break; + + case mtc_op: +#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS + cop0->stat[rd][sel]++; +#endif + if ((rd == MIPS_CP0_TLB_INDEX) + && (vcpu->arch.gprs[rt] >= + KVM_MIPS_GUEST_TLB_SIZE)) { + kvm_err("Invalid TLB Index: %ld", + vcpu->arch.gprs[rt]); + er = EMULATE_FAIL; + break; + } +#define C0_EBASE_CORE_MASK 0xff + if ((rd == MIPS_CP0_PRID) && (sel == 1)) { + /* Preserve CORE number */ + kvm_change_c0_guest_ebase(cop0, + ~(C0_EBASE_CORE_MASK), + vcpu->arch.gprs[rt]); + kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n", + kvm_read_c0_guest_ebase(cop0)); + } else if (rd == MIPS_CP0_TLB_HI && sel == 0) { + uint32_t nasid = + vcpu->arch.gprs[rt] & ASID_MASK; + if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) && + ((kvm_read_c0_guest_entryhi(cop0) & + ASID_MASK) != nasid)) { + kvm_debug("MTCz, change ASID from %#lx to %#lx\n", + kvm_read_c0_guest_entryhi(cop0) + & ASID_MASK, + vcpu->arch.gprs[rt] + & ASID_MASK); + + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + } + kvm_write_c0_guest_entryhi(cop0, + vcpu->arch.gprs[rt]); + } + /* Are we writing to COUNT */ + else if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { + kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]); + goto done; + } else if ((rd == MIPS_CP0_COMPARE) && (sel == 0)) { + kvm_debug("[%#x] MTCz, COMPARE %#lx <- %#lx\n", + pc, kvm_read_c0_guest_compare(cop0), + vcpu->arch.gprs[rt]); + + /* If we are writing to COMPARE */ + /* Clear pending timer interrupt, if any */ + kvm_mips_callbacks->dequeue_timer_int(vcpu); + kvm_mips_write_compare(vcpu, + vcpu->arch.gprs[rt]); + } else if ((rd == MIPS_CP0_STATUS) && (sel == 0)) { + kvm_write_c0_guest_status(cop0, + vcpu->arch.gprs[rt]); + /* + * Make sure that CU1 and NMI bits are + * never set + */ + kvm_clear_c0_guest_status(cop0, + (ST0_CU1 | ST0_NMI)); + +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + kvm_mips_trans_mtc0(inst, opc, vcpu); +#endif + } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) { + uint32_t old_cause, new_cause; + + old_cause = kvm_read_c0_guest_cause(cop0); + new_cause = vcpu->arch.gprs[rt]; + /* Update R/W bits */ + kvm_change_c0_guest_cause(cop0, 0x08800300, + new_cause); + /* DC bit enabling/disabling timer? */ + if ((old_cause ^ new_cause) & CAUSEF_DC) { + if (new_cause & CAUSEF_DC) + kvm_mips_count_disable_cause(vcpu); + else + kvm_mips_count_enable_cause(vcpu); + } + } else { + cop0->reg[rd][sel] = vcpu->arch.gprs[rt]; +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + kvm_mips_trans_mtc0(inst, opc, vcpu); +#endif + } + + kvm_debug("[%#x] MTCz, cop0->reg[%d][%d]: %#lx\n", pc, + rd, sel, cop0->reg[rd][sel]); + break; + + case dmtc_op: + kvm_err("!!!!!!![%#lx]dmtc_op: rt: %d, rd: %d, sel: %d!!!!!!\n", + vcpu->arch.pc, rt, rd, sel); + er = EMULATE_FAIL; + break; + + case mfmcz_op: +#ifdef KVM_MIPS_DEBUG_COP0_COUNTERS + cop0->stat[MIPS_CP0_STATUS][0]++; +#endif + if (rt != 0) { + vcpu->arch.gprs[rt] = + kvm_read_c0_guest_status(cop0); + } + /* EI */ + if (inst & 0x20) { + kvm_debug("[%#lx] mfmcz_op: EI\n", + vcpu->arch.pc); + kvm_set_c0_guest_status(cop0, ST0_IE); + } else { + kvm_debug("[%#lx] mfmcz_op: DI\n", + vcpu->arch.pc); + kvm_clear_c0_guest_status(cop0, ST0_IE); + } + + break; + + case wrpgpr_op: + { + uint32_t css = + cop0->reg[MIPS_CP0_STATUS][2] & 0xf; + uint32_t pss = + (cop0->reg[MIPS_CP0_STATUS][2] >> 6) & 0xf; + /* + * We don't support any shadow register sets, so + * SRSCtl[PSS] == SRSCtl[CSS] = 0 + */ + if (css || pss) { + er = EMULATE_FAIL; + break; + } + kvm_debug("WRPGPR[%d][%d] = %#lx\n", pss, rd, + vcpu->arch.gprs[rt]); + vcpu->arch.gprs[rd] = vcpu->arch.gprs[rt]; + } + break; + default: + kvm_err("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", + vcpu->arch.pc, copz); + er = EMULATE_FAIL; + break; + } + } + +done: + /* Rollback PC only if emulation was unsuccessful */ + if (er == EMULATE_FAIL) + vcpu->arch.pc = curr_pc; + +dont_update_pc: + /* + * This is for special instructions whose emulation + * updates the PC, so do not overwrite the PC under + * any circumstances + */ + + return er; +} + +enum emulation_result kvm_mips_emulate_store(uint32_t inst, uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DO_MMIO; + int32_t op, base, rt, offset; + uint32_t bytes; + void *data = run->mmio.data; + unsigned long curr_pc; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + rt = (inst >> 16) & 0x1f; + base = (inst >> 21) & 0x1f; + offset = inst & 0xffff; + op = (inst >> 26) & 0x3f; + + switch (op) { + case sb_op: + bytes = 1; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + run->mmio.len = bytes; + run->mmio.is_write = 1; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 1; + *(u8 *) data = vcpu->arch.gprs[rt]; + kvm_debug("OP_SB: eaddr: %#lx, gpr: %#lx, data: %#x\n", + vcpu->arch.host_cp0_badvaddr, vcpu->arch.gprs[rt], + *(uint8_t *) data); + + break; + + case sw_op: + bytes = 4; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + + run->mmio.len = bytes; + run->mmio.is_write = 1; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 1; + *(uint32_t *) data = vcpu->arch.gprs[rt]; + + kvm_debug("[%#lx] OP_SW: eaddr: %#lx, gpr: %#lx, data: %#x\n", + vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, + vcpu->arch.gprs[rt], *(uint32_t *) data); + break; + + case sh_op: + bytes = 2; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + + run->mmio.len = bytes; + run->mmio.is_write = 1; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 1; + *(uint16_t *) data = vcpu->arch.gprs[rt]; + + kvm_debug("[%#lx] OP_SH: eaddr: %#lx, gpr: %#lx, data: %#x\n", + vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, + vcpu->arch.gprs[rt], *(uint32_t *) data); + break; + + default: + kvm_err("Store not yet supported"); + er = EMULATE_FAIL; + break; + } + + /* Rollback PC if emulation was unsuccessful */ + if (er == EMULATE_FAIL) + vcpu->arch.pc = curr_pc; + + return er; +} + +enum emulation_result kvm_mips_emulate_load(uint32_t inst, uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DO_MMIO; + int32_t op, base, rt, offset; + uint32_t bytes; + + rt = (inst >> 16) & 0x1f; + base = (inst >> 21) & 0x1f; + offset = inst & 0xffff; + op = (inst >> 26) & 0x3f; + + vcpu->arch.pending_load_cause = cause; + vcpu->arch.io_gpr = rt; + + switch (op) { + case lw_op: + bytes = 4; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + er = EMULATE_FAIL; + break; + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + + run->mmio.len = bytes; + run->mmio.is_write = 0; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 0; + break; + + case lh_op: + case lhu_op: + bytes = 2; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + er = EMULATE_FAIL; + break; + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + + run->mmio.len = bytes; + run->mmio.is_write = 0; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 0; + + if (op == lh_op) + vcpu->mmio_needed = 2; + else + vcpu->mmio_needed = 1; + + break; + + case lbu_op: + case lb_op: + bytes = 1; + if (bytes > sizeof(run->mmio.data)) { + kvm_err("%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + er = EMULATE_FAIL; + break; + } + run->mmio.phys_addr = + kvm_mips_callbacks->gva_to_gpa(vcpu->arch. + host_cp0_badvaddr); + if (run->mmio.phys_addr == KVM_INVALID_ADDR) { + er = EMULATE_FAIL; + break; + } + + run->mmio.len = bytes; + run->mmio.is_write = 0; + vcpu->mmio_is_write = 0; + + if (op == lb_op) + vcpu->mmio_needed = 2; + else + vcpu->mmio_needed = 1; + + break; + + default: + kvm_err("Load not yet supported"); + er = EMULATE_FAIL; + break; + } + + return er; +} + +int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) +{ + unsigned long offset = (va & ~PAGE_MASK); + struct kvm *kvm = vcpu->kvm; + unsigned long pa; + gfn_t gfn; + pfn_t pfn; + + gfn = va >> PAGE_SHIFT; + + if (gfn >= kvm->arch.guest_pmap_npages) { + kvm_err("%s: Invalid gfn: %#llx\n", __func__, gfn); + kvm_mips_dump_host_tlbs(); + kvm_arch_vcpu_dump_regs(vcpu); + return -1; + } + pfn = kvm->arch.guest_pmap[gfn]; + pa = (pfn << PAGE_SHIFT) | offset; + + kvm_debug("%s: va: %#lx, unmapped: %#x\n", __func__, va, + CKSEG0ADDR(pa)); + + local_flush_icache_range(CKSEG0ADDR(pa), 32); + return 0; +} + +#define MIPS_CACHE_OP_INDEX_INV 0x0 +#define MIPS_CACHE_OP_INDEX_LD_TAG 0x1 +#define MIPS_CACHE_OP_INDEX_ST_TAG 0x2 +#define MIPS_CACHE_OP_IMP 0x3 +#define MIPS_CACHE_OP_HIT_INV 0x4 +#define MIPS_CACHE_OP_FILL_WB_INV 0x5 +#define MIPS_CACHE_OP_HIT_HB 0x6 +#define MIPS_CACHE_OP_FETCH_LOCK 0x7 + +#define MIPS_CACHE_ICACHE 0x0 +#define MIPS_CACHE_DCACHE 0x1 +#define MIPS_CACHE_SEC 0x3 + +enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, + uint32_t cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + enum emulation_result er = EMULATE_DONE; + int32_t offset, cache, op_inst, op, base; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long va; + unsigned long curr_pc; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + base = (inst >> 21) & 0x1f; + op_inst = (inst >> 16) & 0x1f; + offset = inst & 0xffff; + cache = (inst >> 16) & 0x3; + op = (inst >> 18) & 0x7; + + va = arch->gprs[base] + offset; + + kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); + + /* + * Treat INDEX_INV as a nop, basically issued by Linux on startup to + * invalidate the caches entirely by stepping through all the + * ways/indexes + */ + if (op == MIPS_CACHE_OP_INDEX_INV) { + kvm_debug("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + vcpu->arch.pc, vcpu->arch.gprs[31], cache, op, base, + arch->gprs[base], offset); + + if (cache == MIPS_CACHE_DCACHE) + r4k_blast_dcache(); + else if (cache == MIPS_CACHE_ICACHE) + r4k_blast_icache(); + else { + kvm_err("%s: unsupported CACHE INDEX operation\n", + __func__); + return EMULATE_FAIL; + } + +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + kvm_mips_trans_cache_index(inst, opc, vcpu); +#endif + goto done; + } + + preempt_disable(); + if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) { + if (kvm_mips_host_tlb_lookup(vcpu, va) < 0) + kvm_mips_handle_kseg0_tlb_fault(va, vcpu); + } else if ((KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0) || + KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) { + int index; + + /* If an entry already exists then skip */ + if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0) + goto skip_fault; + + /* + * If address not in the guest TLB, then give the guest a fault, + * the resulting handler will do the right thing + */ + index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) | + (kvm_read_c0_guest_entryhi + (cop0) & ASID_MASK)); + + if (index < 0) { + vcpu->arch.host_cp0_entryhi = (va & VPN2_MASK); + vcpu->arch.host_cp0_badvaddr = va; + er = kvm_mips_emulate_tlbmiss_ld(cause, NULL, run, + vcpu); + preempt_enable(); + goto dont_update_pc; + } else { + struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; + /* + * Check if the entry is valid, if not then setup a TLB + * invalid exception to the guest + */ + if (!TLB_IS_VALID(*tlb, va)) { + er = kvm_mips_emulate_tlbinv_ld(cause, NULL, + run, vcpu); + preempt_enable(); + goto dont_update_pc; + } else { + /* + * We fault an entry from the guest tlb to the + * shadow host TLB + */ + kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, + NULL, + NULL); + } + } + } else { + kvm_err("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); + er = EMULATE_FAIL; + preempt_enable(); + goto dont_update_pc; + + } + +skip_fault: + /* XXXKYMA: Only a subset of cache ops are supported, used by Linux */ + if (cache == MIPS_CACHE_DCACHE + && (op == MIPS_CACHE_OP_FILL_WB_INV + || op == MIPS_CACHE_OP_HIT_INV)) { + flush_dcache_line(va); + +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + /* + * Replace the CACHE instruction, with a SYNCI, not the same, + * but avoids a trap + */ + kvm_mips_trans_cache_va(inst, opc, vcpu); +#endif + } else if (op == MIPS_CACHE_OP_HIT_INV && cache == MIPS_CACHE_ICACHE) { + flush_dcache_line(va); + flush_icache_line(va); + +#ifdef CONFIG_KVM_MIPS_DYN_TRANS + /* Replace the CACHE instruction, with a SYNCI */ + kvm_mips_trans_cache_va(inst, opc, vcpu); +#endif + } else { + kvm_err("NO-OP CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); + er = EMULATE_FAIL; + preempt_enable(); + goto dont_update_pc; + } + + preempt_enable(); + +dont_update_pc: + /* Rollback PC */ + vcpu->arch.pc = curr_pc; +done: + return er; +} + +enum emulation_result kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + uint32_t inst; + + /* Fetch the instruction. */ + if (cause & CAUSEF_BD) + opc += 1; + + inst = kvm_get_inst(opc, vcpu); + + switch (((union mips_instruction)inst).r_format.opcode) { + case cop0_op: + er = kvm_mips_emulate_CP0(inst, opc, cause, run, vcpu); + break; + case sb_op: + case sh_op: + case sw_op: + er = kvm_mips_emulate_store(inst, cause, run, vcpu); + break; + case lb_op: + case lbu_op: + case lhu_op: + case lh_op: + case lw_op: + er = kvm_mips_emulate_load(inst, cause, run, vcpu); + break; + + case cache_op: + ++vcpu->stat.cache_exits; + trace_kvm_exit(vcpu, CACHE_EXITS); + er = kvm_mips_emulate_cache(inst, opc, cause, run, vcpu); + break; + + default: + kvm_err("Instruction emulation not supported (%p/%#x)\n", opc, + inst); + kvm_arch_vcpu_dump_regs(vcpu); + er = EMULATE_FAIL; + break; + } + + return er; +} + +enum emulation_result kvm_mips_emulate_syscall(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + enum emulation_result er = EMULATE_DONE; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("Delivering SYSCALL @ pc %#lx\n", arch->pc); + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_SYSCALL << CAUSEB_EXCCODE)); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + } else { + kvm_err("Trying to deliver SYSCALL when EXL is already set\n"); + er = EMULATE_FAIL; + } + + return er; +} + +enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long entryhi = (vcpu->arch. host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("[EXL == 0] delivering TLB MISS @ pc %#lx\n", + arch->pc); + + /* set pc to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x0; + + } else { + kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", + arch->pc); + + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_TLB_LD_MISS << CAUSEB_EXCCODE)); + + /* setup badvaddr, context and entryhi registers for the guest */ + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + /* XXXKYMA: is the context register used by linux??? */ + kvm_write_c0_guest_entryhi(cop0, entryhi); + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long entryhi = + (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n", + arch->pc); + + /* set pc to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + } else { + kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", + arch->pc); + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_TLB_LD_MISS << CAUSEB_EXCCODE)); + + /* setup badvaddr, context and entryhi registers for the guest */ + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + /* XXXKYMA: is the context register used by linux??? */ + kvm_write_c0_guest_entryhi(cop0, entryhi); + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", + arch->pc); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x0; + } else { + kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", + arch->pc); + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_TLB_ST_MISS << CAUSEB_EXCCODE)); + + /* setup badvaddr, context and entryhi registers for the guest */ + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + /* XXXKYMA: is the context register used by linux??? */ + kvm_write_c0_guest_entryhi(cop0, entryhi); + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", + arch->pc); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } else { + kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", + arch->pc); + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_TLB_ST_MISS << CAUSEB_EXCCODE)); + + /* setup badvaddr, context and entryhi registers for the guest */ + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + /* XXXKYMA: is the context register used by linux??? */ + kvm_write_c0_guest_entryhi(cop0, entryhi); + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + + return EMULATE_DONE; +} + +/* TLBMOD: store into address matching TLB with Dirty bit off */ +enum emulation_result kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; +#ifdef DEBUG + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + int index; + + /* If address not in the guest TLB, then we are in trouble */ + index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); + if (index < 0) { + /* XXXKYMA Invalidate and retry */ + kvm_mips_host_tlb_inv(vcpu, vcpu->arch.host_cp0_badvaddr); + kvm_err("%s: host got TLBMOD for %#lx but entry not present in Guest TLB\n", + __func__, entryhi); + kvm_mips_dump_guest_tlbs(vcpu); + kvm_mips_dump_host_tlbs(); + return EMULATE_FAIL; + } +#endif + + er = kvm_mips_emulate_tlbmod(cause, opc, run, vcpu); + return er; +} + +enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | + (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); + struct kvm_vcpu_arch *arch = &vcpu->arch; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n", + arch->pc); + + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } else { + kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n", + arch->pc); + arch->pc = KVM_GUEST_KSEG0 + 0x180; + } + + kvm_change_c0_guest_cause(cop0, (0xff), (T_TLB_MOD << CAUSEB_EXCCODE)); + + /* setup badvaddr, context and entryhi registers for the guest */ + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + /* XXXKYMA: is the context register used by linux??? */ + kvm_write_c0_guest_entryhi(cop0, entryhi); + /* Blow away the shadow host TLBs */ + kvm_mips_flush_host_tlb(1); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + } + + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_COP_UNUSABLE << CAUSEB_EXCCODE)); + kvm_change_c0_guest_cause(cop0, (CAUSEF_CE), (0x1 << CAUSEB_CE)); + + return EMULATE_DONE; +} + +enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + enum emulation_result er = EMULATE_DONE; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("Delivering RI @ pc %#lx\n", arch->pc); + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_RES_INST << CAUSEB_EXCCODE)); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + } else { + kvm_err("Trying to deliver RI when EXL is already set\n"); + er = EMULATE_FAIL; + } + + return er; +} + +enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + enum emulation_result er = EMULATE_DONE; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("Delivering BP @ pc %#lx\n", arch->pc); + + kvm_change_c0_guest_cause(cop0, (0xff), + (T_BREAK << CAUSEB_EXCCODE)); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + } else { + kvm_err("Trying to deliver BP when EXL is already set\n"); + er = EMULATE_FAIL; + } + + return er; +} + +/* ll/sc, rdhwr, sync emulation */ + +#define OPCODE 0xfc000000 +#define BASE 0x03e00000 +#define RT 0x001f0000 +#define OFFSET 0x0000ffff +#define LL 0xc0000000 +#define SC 0xe0000000 +#define SPEC0 0x00000000 +#define SPEC3 0x7c000000 +#define RD 0x0000f800 +#define FUNC 0x0000003f +#define SYNC 0x0000000f +#define RDHWR 0x0000003b + +enum emulation_result kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + enum emulation_result er = EMULATE_DONE; + unsigned long curr_pc; + uint32_t inst; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + /* Fetch the instruction. */ + if (cause & CAUSEF_BD) + opc += 1; + + inst = kvm_get_inst(opc, vcpu); + + if (inst == KVM_INVALID_INST) { + kvm_err("%s: Cannot get inst @ %p\n", __func__, opc); + return EMULATE_FAIL; + } + + if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) { + int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); + int rd = (inst & RD) >> 11; + int rt = (inst & RT) >> 16; + /* If usermode, check RDHWR rd is allowed by guest HWREna */ + if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) { + kvm_debug("RDHWR %#x disallowed by HWREna @ %p\n", + rd, opc); + goto emulate_ri; + } + switch (rd) { + case 0: /* CPU number */ + arch->gprs[rt] = 0; + break; + case 1: /* SYNCI length */ + arch->gprs[rt] = min(current_cpu_data.dcache.linesz, + current_cpu_data.icache.linesz); + break; + case 2: /* Read count register */ + arch->gprs[rt] = kvm_mips_read_count(vcpu); + break; + case 3: /* Count register resolution */ + switch (current_cpu_data.cputype) { + case CPU_20KC: + case CPU_25KF: + arch->gprs[rt] = 1; + break; + default: + arch->gprs[rt] = 2; + } + break; + case 29: + arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0); + break; + + default: + kvm_debug("RDHWR %#x not supported @ %p\n", rd, opc); + goto emulate_ri; + } + } else { + kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst); + goto emulate_ri; + } + + return EMULATE_DONE; + +emulate_ri: + /* + * Rollback PC (if in branch delay slot then the PC already points to + * branch target), and pass the RI exception to the guest OS. + */ + vcpu->arch.pc = curr_pc; + return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); +} + +enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, + struct kvm_run *run) +{ + unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; + enum emulation_result er = EMULATE_DONE; + unsigned long curr_pc; + + if (run->mmio.len > sizeof(*gpr)) { + kvm_err("Bad MMIO length: %d", run->mmio.len); + er = EMULATE_FAIL; + goto done; + } + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, vcpu->arch.pending_load_cause); + if (er == EMULATE_FAIL) + return er; + + switch (run->mmio.len) { + case 4: + *gpr = *(int32_t *) run->mmio.data; + break; + + case 2: + if (vcpu->mmio_needed == 2) + *gpr = *(int16_t *) run->mmio.data; + else + *gpr = *(int16_t *) run->mmio.data; + + break; + case 1: + if (vcpu->mmio_needed == 2) + *gpr = *(int8_t *) run->mmio.data; + else + *gpr = *(u8 *) run->mmio.data; + break; + } + + if (vcpu->arch.pending_load_cause & CAUSEF_BD) + kvm_debug("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", + vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, + vcpu->mmio_needed); + +done: + return er; +} + +static enum emulation_result kvm_mips_emulate_exc(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_vcpu_arch *arch = &vcpu->arch; + enum emulation_result er = EMULATE_DONE; + + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_change_c0_guest_cause(cop0, (0xff), + (exccode << CAUSEB_EXCCODE)); + + /* Set PC to the exception entry point */ + arch->pc = KVM_GUEST_KSEG0 + 0x180; + kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); + + kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n", + exccode, kvm_read_c0_guest_epc(cop0), + kvm_read_c0_guest_badvaddr(cop0)); + } else { + kvm_err("Trying to deliver EXC when EXL is already set\n"); + er = EMULATE_FAIL; + } + + return er; +} + +enum emulation_result kvm_mips_check_privilege(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + + int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); + + if (usermode) { + switch (exccode) { + case T_INT: + case T_SYSCALL: + case T_BREAK: + case T_RES_INST: + break; + + case T_COP_UNUSABLE: + if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 0) + er = EMULATE_PRIV_FAIL; + break; + + case T_TLB_MOD: + break; + + case T_TLB_LD_MISS: + /* + * We we are accessing Guest kernel space, then send an + * address error exception to the guest + */ + if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { + kvm_debug("%s: LD MISS @ %#lx\n", __func__, + badvaddr); + cause &= ~0xff; + cause |= (T_ADDR_ERR_LD << CAUSEB_EXCCODE); + er = EMULATE_PRIV_FAIL; + } + break; + + case T_TLB_ST_MISS: + /* + * We we are accessing Guest kernel space, then send an + * address error exception to the guest + */ + if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { + kvm_debug("%s: ST MISS @ %#lx\n", __func__, + badvaddr); + cause &= ~0xff; + cause |= (T_ADDR_ERR_ST << CAUSEB_EXCCODE); + er = EMULATE_PRIV_FAIL; + } + break; + + case T_ADDR_ERR_ST: + kvm_debug("%s: address error ST @ %#lx\n", __func__, + badvaddr); + if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { + cause &= ~0xff; + cause |= (T_TLB_ST_MISS << CAUSEB_EXCCODE); + } + er = EMULATE_PRIV_FAIL; + break; + case T_ADDR_ERR_LD: + kvm_debug("%s: address error LD @ %#lx\n", __func__, + badvaddr); + if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { + cause &= ~0xff; + cause |= (T_TLB_LD_MISS << CAUSEB_EXCCODE); + } + er = EMULATE_PRIV_FAIL; + break; + default: + er = EMULATE_PRIV_FAIL; + break; + } + } + + if (er == EMULATE_PRIV_FAIL) + kvm_mips_emulate_exc(cause, opc, run, vcpu); + + return er; +} + +/* + * User Address (UA) fault, this could happen if + * (1) TLB entry not present/valid in both Guest and shadow host TLBs, in this + * case we pass on the fault to the guest kernel and let it handle it. + * (2) TLB entry is present in the Guest TLB but not in the shadow, in this + * case we inject the TLB from the Guest TLB into the shadow host TLB + */ +enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, + uint32_t *opc, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; + unsigned long va = vcpu->arch.host_cp0_badvaddr; + int index; + + kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx, entryhi: %#lx\n", + vcpu->arch.host_cp0_badvaddr, vcpu->arch.host_cp0_entryhi); + + /* + * KVM would not have got the exception if this entry was valid in the + * shadow host TLB. Check the Guest TLB, if the entry is not there then + * send the guest an exception. The guest exc handler should then inject + * an entry into the guest TLB. + */ + index = kvm_mips_guest_tlb_lookup(vcpu, + (va & VPN2_MASK) | + (kvm_read_c0_guest_entryhi + (vcpu->arch.cop0) & ASID_MASK)); + if (index < 0) { + if (exccode == T_TLB_LD_MISS) { + er = kvm_mips_emulate_tlbmiss_ld(cause, opc, run, vcpu); + } else if (exccode == T_TLB_ST_MISS) { + er = kvm_mips_emulate_tlbmiss_st(cause, opc, run, vcpu); + } else { + kvm_err("%s: invalid exc code: %d\n", __func__, + exccode); + er = EMULATE_FAIL; + } + } else { + struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; + + /* + * Check if the entry is valid, if not then setup a TLB invalid + * exception to the guest + */ + if (!TLB_IS_VALID(*tlb, va)) { + if (exccode == T_TLB_LD_MISS) { + er = kvm_mips_emulate_tlbinv_ld(cause, opc, run, + vcpu); + } else if (exccode == T_TLB_ST_MISS) { + er = kvm_mips_emulate_tlbinv_st(cause, opc, run, + vcpu); + } else { + kvm_err("%s: invalid exc code: %d\n", __func__, + exccode); + er = EMULATE_FAIL; + } + } else { + kvm_debug("Injecting hi: %#lx, lo0: %#lx, lo1: %#lx into shadow host TLB\n", + tlb->tlb_hi, tlb->tlb_lo0, tlb->tlb_lo1); + /* + * OK we have a Guest TLB entry, now inject it into the + * shadow host TLB + */ + kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, NULL, + NULL); + } + } + + return er; +} diff --git a/arch/mips/kvm/interrupt.c b/arch/mips/kvm/interrupt.c new file mode 100644 index 000000000000..9b4445940c2b --- /dev/null +++ b/arch/mips/kvm/interrupt.c @@ -0,0 +1,242 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Interrupt delivery + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "interrupt.h" + +void kvm_mips_queue_irq(struct kvm_vcpu *vcpu, uint32_t priority) +{ + set_bit(priority, &vcpu->arch.pending_exceptions); +} + +void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, uint32_t priority) +{ + clear_bit(priority, &vcpu->arch.pending_exceptions); +} + +void kvm_mips_queue_timer_int_cb(struct kvm_vcpu *vcpu) +{ + /* + * Cause bits to reflect the pending timer interrupt, + * the EXC code will be set when we are actually + * delivering the interrupt: + */ + kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ5 | C_TI)); + + /* Queue up an INT exception for the core */ + kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_TIMER); + +} + +void kvm_mips_dequeue_timer_int_cb(struct kvm_vcpu *vcpu) +{ + kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ5 | C_TI)); + kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER); +} + +void kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) +{ + int intr = (int)irq->irq; + + /* + * Cause bits to reflect the pending IO interrupt, + * the EXC code will be set when we are actually + * delivering the interrupt: + */ + switch (intr) { + case 2: + kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ0)); + /* Queue up an INT exception for the core */ + kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IO); + break; + + case 3: + kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ1)); + kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IPI_1); + break; + + case 4: + kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ2)); + kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IPI_2); + break; + + default: + break; + } + +} + +void kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) +{ + int intr = (int)irq->irq; + + switch (intr) { + case -2: + kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ0)); + kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IO); + break; + + case -3: + kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ1)); + kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_1); + break; + + case -4: + kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ2)); + kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_2); + break; + + default: + break; + } + +} + +/* Deliver the interrupt of the corresponding priority, if possible. */ +int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause) +{ + int allowed = 0; + uint32_t exccode; + + struct kvm_vcpu_arch *arch = &vcpu->arch; + struct mips_coproc *cop0 = vcpu->arch.cop0; + + switch (priority) { + case MIPS_EXC_INT_TIMER: + if ((kvm_read_c0_guest_status(cop0) & ST0_IE) + && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) + && (kvm_read_c0_guest_status(cop0) & IE_IRQ5)) { + allowed = 1; + exccode = T_INT; + } + break; + + case MIPS_EXC_INT_IO: + if ((kvm_read_c0_guest_status(cop0) & ST0_IE) + && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) + && (kvm_read_c0_guest_status(cop0) & IE_IRQ0)) { + allowed = 1; + exccode = T_INT; + } + break; + + case MIPS_EXC_INT_IPI_1: + if ((kvm_read_c0_guest_status(cop0) & ST0_IE) + && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) + && (kvm_read_c0_guest_status(cop0) & IE_IRQ1)) { + allowed = 1; + exccode = T_INT; + } + break; + + case MIPS_EXC_INT_IPI_2: + if ((kvm_read_c0_guest_status(cop0) & ST0_IE) + && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) + && (kvm_read_c0_guest_status(cop0) & IE_IRQ2)) { + allowed = 1; + exccode = T_INT; + } + break; + + default: + break; + } + + /* Are we allowed to deliver the interrupt ??? */ + if (allowed) { + if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { + /* save old pc */ + kvm_write_c0_guest_epc(cop0, arch->pc); + kvm_set_c0_guest_status(cop0, ST0_EXL); + + if (cause & CAUSEF_BD) + kvm_set_c0_guest_cause(cop0, CAUSEF_BD); + else + kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); + + kvm_debug("Delivering INT @ pc %#lx\n", arch->pc); + + } else + kvm_err("Trying to deliver interrupt when EXL is already set\n"); + + kvm_change_c0_guest_cause(cop0, CAUSEF_EXCCODE, + (exccode << CAUSEB_EXCCODE)); + + /* XXXSL Set PC to the interrupt exception entry point */ + if (kvm_read_c0_guest_cause(cop0) & CAUSEF_IV) + arch->pc = KVM_GUEST_KSEG0 + 0x200; + else + arch->pc = KVM_GUEST_KSEG0 + 0x180; + + clear_bit(priority, &vcpu->arch.pending_exceptions); + } + + return allowed; +} + +int kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause) +{ + return 1; +} + +void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, uint32_t cause) +{ + unsigned long *pending = &vcpu->arch.pending_exceptions; + unsigned long *pending_clr = &vcpu->arch.pending_exceptions_clr; + unsigned int priority; + + if (!(*pending) && !(*pending_clr)) + return; + + priority = __ffs(*pending_clr); + while (priority <= MIPS_EXC_MAX) { + if (kvm_mips_callbacks->irq_clear(vcpu, priority, cause)) { + if (!KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE) + break; + } + + priority = find_next_bit(pending_clr, + BITS_PER_BYTE * sizeof(*pending_clr), + priority + 1); + } + + priority = __ffs(*pending); + while (priority <= MIPS_EXC_MAX) { + if (kvm_mips_callbacks->irq_deliver(vcpu, priority, cause)) { + if (!KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE) + break; + } + + priority = find_next_bit(pending, + BITS_PER_BYTE * sizeof(*pending), + priority + 1); + } + +} + +int kvm_mips_pending_timer(struct kvm_vcpu *vcpu) +{ + return test_bit(MIPS_EXC_INT_TIMER, &vcpu->arch.pending_exceptions); +} diff --git a/arch/mips/kvm/interrupt.h b/arch/mips/kvm/interrupt.h new file mode 100644 index 000000000000..4ab4bdfad703 --- /dev/null +++ b/arch/mips/kvm/interrupt.h @@ -0,0 +1,53 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Interrupts + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +/* + * MIPS Exception Priorities, exceptions (including interrupts) are queued up + * for the guest in the order specified by their priorities + */ + +#define MIPS_EXC_RESET 0 +#define MIPS_EXC_SRESET 1 +#define MIPS_EXC_DEBUG_ST 2 +#define MIPS_EXC_DEBUG 3 +#define MIPS_EXC_DDB 4 +#define MIPS_EXC_NMI 5 +#define MIPS_EXC_MCHK 6 +#define MIPS_EXC_INT_TIMER 7 +#define MIPS_EXC_INT_IO 8 +#define MIPS_EXC_EXECUTE 9 +#define MIPS_EXC_INT_IPI_1 10 +#define MIPS_EXC_INT_IPI_2 11 +#define MIPS_EXC_MAX 12 +/* XXXSL More to follow */ + +extern char mips32_exception[], mips32_exceptionEnd[]; +extern char mips32_GuestException[], mips32_GuestExceptionEnd[]; + +#define C_TI (_ULCAST_(1) << 30) + +#define KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE (0) +#define KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE (0) + +void kvm_mips_queue_irq(struct kvm_vcpu *vcpu, uint32_t priority); +void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, uint32_t priority); +int kvm_mips_pending_timer(struct kvm_vcpu *vcpu); + +void kvm_mips_queue_timer_int_cb(struct kvm_vcpu *vcpu); +void kvm_mips_dequeue_timer_int_cb(struct kvm_vcpu *vcpu); +void kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq); +void kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq); +int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause); +int kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, + uint32_t cause); +void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, uint32_t cause); diff --git a/arch/mips/kvm/kvm_cb.c b/arch/mips/kvm/kvm_cb.c deleted file mode 100644 index 313c2e37b978..000000000000 --- a/arch/mips/kvm/kvm_cb.c +++ /dev/null @@ -1,14 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Yann Le Du - */ - -#include -#include - -struct kvm_mips_callbacks *kvm_mips_callbacks; -EXPORT_SYMBOL(kvm_mips_callbacks); diff --git a/arch/mips/kvm/kvm_locore.S b/arch/mips/kvm/kvm_locore.S deleted file mode 100644 index d7279c03c517..000000000000 --- a/arch/mips/kvm/kvm_locore.S +++ /dev/null @@ -1,620 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Main entry point for the guest, exception handling. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include - -#define _C_LABEL(x) x -#define MIPSX(name) mips32_ ## name -#define CALLFRAME_SIZ 32 - -/* - * VECTOR - * exception vector entrypoint - */ -#define VECTOR(x, regmask) \ - .ent _C_LABEL(x),0; \ - EXPORT(x); - -#define VECTOR_END(x) \ - EXPORT(x); - -/* Overload, Danger Will Robinson!! */ -#define PT_HOST_ASID PT_BVADDR -#define PT_HOST_USERLOCAL PT_EPC - -#define CP0_DDATA_LO $28,3 -#define CP0_EBASE $15,1 - -#define CP0_INTCTL $12,1 -#define CP0_SRSCTL $12,2 -#define CP0_SRSMAP $12,3 -#define CP0_HWRENA $7,0 - -/* Resume Flags */ -#define RESUME_FLAG_HOST (1<<1) /* Resume host? */ - -#define RESUME_GUEST 0 -#define RESUME_HOST RESUME_FLAG_HOST - -/* - * __kvm_mips_vcpu_run: entry point to the guest - * a0: run - * a1: vcpu - */ - .set noreorder - .set noat - -FEXPORT(__kvm_mips_vcpu_run) - /* k0/k1 not being used in host kernel context */ - INT_ADDIU k1, sp, -PT_SIZE - LONG_S $0, PT_R0(k1) - LONG_S $1, PT_R1(k1) - LONG_S $2, PT_R2(k1) - LONG_S $3, PT_R3(k1) - - LONG_S $4, PT_R4(k1) - LONG_S $5, PT_R5(k1) - LONG_S $6, PT_R6(k1) - LONG_S $7, PT_R7(k1) - - LONG_S $8, PT_R8(k1) - LONG_S $9, PT_R9(k1) - LONG_S $10, PT_R10(k1) - LONG_S $11, PT_R11(k1) - LONG_S $12, PT_R12(k1) - LONG_S $13, PT_R13(k1) - LONG_S $14, PT_R14(k1) - LONG_S $15, PT_R15(k1) - LONG_S $16, PT_R16(k1) - LONG_S $17, PT_R17(k1) - - LONG_S $18, PT_R18(k1) - LONG_S $19, PT_R19(k1) - LONG_S $20, PT_R20(k1) - LONG_S $21, PT_R21(k1) - LONG_S $22, PT_R22(k1) - LONG_S $23, PT_R23(k1) - LONG_S $24, PT_R24(k1) - LONG_S $25, PT_R25(k1) - - /* - * XXXKYMA k0/k1 not saved, not being used if we got here through - * an ioctl() - */ - - LONG_S $28, PT_R28(k1) - LONG_S $29, PT_R29(k1) - LONG_S $30, PT_R30(k1) - LONG_S $31, PT_R31(k1) - - /* Save hi/lo */ - mflo v0 - LONG_S v0, PT_LO(k1) - mfhi v1 - LONG_S v1, PT_HI(k1) - - /* Save host status */ - mfc0 v0, CP0_STATUS - LONG_S v0, PT_STATUS(k1) - - /* Save host ASID, shove it into the BVADDR location */ - mfc0 v1, CP0_ENTRYHI - andi v1, 0xff - LONG_S v1, PT_HOST_ASID(k1) - - /* Save DDATA_LO, will be used to store pointer to vcpu */ - mfc0 v1, CP0_DDATA_LO - LONG_S v1, PT_HOST_USERLOCAL(k1) - - /* DDATA_LO has pointer to vcpu */ - mtc0 a1, CP0_DDATA_LO - - /* Offset into vcpu->arch */ - INT_ADDIU k1, a1, VCPU_HOST_ARCH - - /* - * Save the host stack to VCPU, used for exception processing - * when we exit from the Guest - */ - LONG_S sp, VCPU_HOST_STACK(k1) - - /* Save the kernel gp as well */ - LONG_S gp, VCPU_HOST_GP(k1) - - /* - * Setup status register for running the guest in UM, interrupts - * are disabled - */ - li k0, (ST0_EXL | KSU_USER | ST0_BEV) - mtc0 k0, CP0_STATUS - ehb - - /* load up the new EBASE */ - LONG_L k0, VCPU_GUEST_EBASE(k1) - mtc0 k0, CP0_EBASE - - /* - * Now that the new EBASE has been loaded, unset BEV, set - * interrupt mask as it was but make sure that timer interrupts - * are enabled - */ - li k0, (ST0_EXL | KSU_USER | ST0_IE) - andi v0, v0, ST0_IM - or k0, k0, v0 - mtc0 k0, CP0_STATUS - ehb - - /* Set Guest EPC */ - LONG_L t0, VCPU_PC(k1) - mtc0 t0, CP0_EPC - -FEXPORT(__kvm_mips_load_asid) - /* Set the ASID for the Guest Kernel */ - INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ - /* addresses shift to 0x80000000 */ - bltz t0, 1f /* If kernel */ - INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ - INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */ -1: - /* t1: contains the base of the ASID array, need to get the cpu id */ - LONG_L t2, TI_CPU($28) /* smp_processor_id */ - INT_SLL t2, t2, 2 /* x4 */ - REG_ADDU t3, t1, t2 - LONG_L k0, (t3) - andi k0, k0, 0xff - mtc0 k0, CP0_ENTRYHI - ehb - - /* Disable RDHWR access */ - mtc0 zero, CP0_HWRENA - - /* Now load up the Guest Context from VCPU */ - LONG_L $1, VCPU_R1(k1) - LONG_L $2, VCPU_R2(k1) - LONG_L $3, VCPU_R3(k1) - - LONG_L $4, VCPU_R4(k1) - LONG_L $5, VCPU_R5(k1) - LONG_L $6, VCPU_R6(k1) - LONG_L $7, VCPU_R7(k1) - - LONG_L $8, VCPU_R8(k1) - LONG_L $9, VCPU_R9(k1) - LONG_L $10, VCPU_R10(k1) - LONG_L $11, VCPU_R11(k1) - LONG_L $12, VCPU_R12(k1) - LONG_L $13, VCPU_R13(k1) - LONG_L $14, VCPU_R14(k1) - LONG_L $15, VCPU_R15(k1) - LONG_L $16, VCPU_R16(k1) - LONG_L $17, VCPU_R17(k1) - LONG_L $18, VCPU_R18(k1) - LONG_L $19, VCPU_R19(k1) - LONG_L $20, VCPU_R20(k1) - LONG_L $21, VCPU_R21(k1) - LONG_L $22, VCPU_R22(k1) - LONG_L $23, VCPU_R23(k1) - LONG_L $24, VCPU_R24(k1) - LONG_L $25, VCPU_R25(k1) - - /* k0/k1 loaded up later */ - - LONG_L $28, VCPU_R28(k1) - LONG_L $29, VCPU_R29(k1) - LONG_L $30, VCPU_R30(k1) - LONG_L $31, VCPU_R31(k1) - - /* Restore hi/lo */ - LONG_L k0, VCPU_LO(k1) - mtlo k0 - - LONG_L k0, VCPU_HI(k1) - mthi k0 - -FEXPORT(__kvm_mips_load_k0k1) - /* Restore the guest's k0/k1 registers */ - LONG_L k0, VCPU_R26(k1) - LONG_L k1, VCPU_R27(k1) - - /* Jump to guest */ - eret - -VECTOR(MIPSX(exception), unknown) -/* Find out what mode we came from and jump to the proper handler. */ - mtc0 k0, CP0_ERROREPC #01: Save guest k0 - ehb #02: - - mfc0 k0, CP0_EBASE #02: Get EBASE - INT_SRL k0, k0, 10 #03: Get rid of CPUNum - INT_SLL k0, k0, 10 #04 - LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000 - INT_ADDIU k0, k0, 0x2000 #06: Exception handler is - # installed @ offset 0x2000 - j k0 #07: jump to the function - nop #08: branch delay slot -VECTOR_END(MIPSX(exceptionEnd)) -.end MIPSX(exception) - -/* - * Generic Guest exception handler. We end up here when the guest - * does something that causes a trap to kernel mode. - */ -NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) - /* Get the VCPU pointer from DDTATA_LO */ - mfc0 k1, CP0_DDATA_LO - INT_ADDIU k1, k1, VCPU_HOST_ARCH - - /* Start saving Guest context to VCPU */ - LONG_S $0, VCPU_R0(k1) - LONG_S $1, VCPU_R1(k1) - LONG_S $2, VCPU_R2(k1) - LONG_S $3, VCPU_R3(k1) - LONG_S $4, VCPU_R4(k1) - LONG_S $5, VCPU_R5(k1) - LONG_S $6, VCPU_R6(k1) - LONG_S $7, VCPU_R7(k1) - LONG_S $8, VCPU_R8(k1) - LONG_S $9, VCPU_R9(k1) - LONG_S $10, VCPU_R10(k1) - LONG_S $11, VCPU_R11(k1) - LONG_S $12, VCPU_R12(k1) - LONG_S $13, VCPU_R13(k1) - LONG_S $14, VCPU_R14(k1) - LONG_S $15, VCPU_R15(k1) - LONG_S $16, VCPU_R16(k1) - LONG_S $17, VCPU_R17(k1) - LONG_S $18, VCPU_R18(k1) - LONG_S $19, VCPU_R19(k1) - LONG_S $20, VCPU_R20(k1) - LONG_S $21, VCPU_R21(k1) - LONG_S $22, VCPU_R22(k1) - LONG_S $23, VCPU_R23(k1) - LONG_S $24, VCPU_R24(k1) - LONG_S $25, VCPU_R25(k1) - - /* Guest k0/k1 saved later */ - - LONG_S $28, VCPU_R28(k1) - LONG_S $29, VCPU_R29(k1) - LONG_S $30, VCPU_R30(k1) - LONG_S $31, VCPU_R31(k1) - - /* We need to save hi/lo and restore them on the way out */ - mfhi t0 - LONG_S t0, VCPU_HI(k1) - - mflo t0 - LONG_S t0, VCPU_LO(k1) - - /* Finally save guest k0/k1 to VCPU */ - mfc0 t0, CP0_ERROREPC - LONG_S t0, VCPU_R26(k1) - - /* Get GUEST k1 and save it in VCPU */ - PTR_LI t1, ~0x2ff - mfc0 t0, CP0_EBASE - and t0, t0, t1 - LONG_L t0, 0x3000(t0) - LONG_S t0, VCPU_R27(k1) - - /* Now that context has been saved, we can use other registers */ - - /* Restore vcpu */ - mfc0 a1, CP0_DDATA_LO - move s1, a1 - - /* Restore run (vcpu->run) */ - LONG_L a0, VCPU_RUN(a1) - /* Save pointer to run in s0, will be saved by the compiler */ - move s0, a0 - - /* - * Save Host level EPC, BadVaddr and Cause to VCPU, useful to - * process the exception - */ - mfc0 k0,CP0_EPC - LONG_S k0, VCPU_PC(k1) - - mfc0 k0, CP0_BADVADDR - LONG_S k0, VCPU_HOST_CP0_BADVADDR(k1) - - mfc0 k0, CP0_CAUSE - LONG_S k0, VCPU_HOST_CP0_CAUSE(k1) - - mfc0 k0, CP0_ENTRYHI - LONG_S k0, VCPU_HOST_ENTRYHI(k1) - - /* Now restore the host state just enough to run the handlers */ - - /* Swtich EBASE to the one used by Linux */ - /* load up the host EBASE */ - mfc0 v0, CP0_STATUS - - .set at - or k0, v0, ST0_BEV - .set noat - - mtc0 k0, CP0_STATUS - ehb - - LONG_L k0, VCPU_HOST_EBASE(k1) - mtc0 k0,CP0_EBASE - - /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ - .set at - and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE) - or v0, v0, ST0_CU0 - .set noat - mtc0 v0, CP0_STATUS - ehb - - /* Load up host GP */ - LONG_L gp, VCPU_HOST_GP(k1) - - /* Need a stack before we can jump to "C" */ - LONG_L sp, VCPU_HOST_STACK(k1) - - /* Saved host state */ - INT_ADDIU sp, sp, -PT_SIZE - - /* - * XXXKYMA do we need to load the host ASID, maybe not because the - * kernel entries are marked GLOBAL, need to verify - */ - - /* Restore host DDATA_LO */ - LONG_L k0, PT_HOST_USERLOCAL(sp) - mtc0 k0, CP0_DDATA_LO - - /* Restore RDHWR access */ - PTR_LI k0, 0x2000000F - mtc0 k0, CP0_HWRENA - - /* Jump to handler */ -FEXPORT(__kvm_mips_jump_to_handler) - /* - * XXXKYMA: not sure if this is safe, how large is the stack?? - * Now jump to the kvm_mips_handle_exit() to see if we can deal - * with this in the kernel - */ - PTR_LA t9, kvm_mips_handle_exit - jalr.hb t9 - INT_ADDIU sp, sp, -CALLFRAME_SIZ /* BD Slot */ - - /* Return from handler Make sure interrupts are disabled */ - di - ehb - - /* - * XXXKYMA: k0/k1 could have been blown away if we processed - * an exception while we were handling the exception from the - * guest, reload k1 - */ - - move k1, s1 - INT_ADDIU k1, k1, VCPU_HOST_ARCH - - /* - * Check return value, should tell us if we are returning to the - * host (handle I/O etc)or resuming the guest - */ - andi t0, v0, RESUME_HOST - bnez t0, __kvm_mips_return_to_host - nop - -__kvm_mips_return_to_guest: - /* Put the saved pointer to vcpu (s1) back into the DDATA_LO Register */ - mtc0 s1, CP0_DDATA_LO - - /* Load up the Guest EBASE to minimize the window where BEV is set */ - LONG_L t0, VCPU_GUEST_EBASE(k1) - - /* Switch EBASE back to the one used by KVM */ - mfc0 v1, CP0_STATUS - .set at - or k0, v1, ST0_BEV - .set noat - mtc0 k0, CP0_STATUS - ehb - mtc0 t0, CP0_EBASE - - /* Setup status register for running guest in UM */ - .set at - or v1, v1, (ST0_EXL | KSU_USER | ST0_IE) - and v1, v1, ~ST0_CU0 - .set noat - mtc0 v1, CP0_STATUS - ehb - - /* Set Guest EPC */ - LONG_L t0, VCPU_PC(k1) - mtc0 t0, CP0_EPC - - /* Set the ASID for the Guest Kernel */ - INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ - /* addresses shift to 0x80000000 */ - bltz t0, 1f /* If kernel */ - INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ - INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */ -1: - /* t1: contains the base of the ASID array, need to get the cpu id */ - LONG_L t2, TI_CPU($28) /* smp_processor_id */ - INT_SLL t2, t2, 2 /* x4 */ - REG_ADDU t3, t1, t2 - LONG_L k0, (t3) - andi k0, k0, 0xff - mtc0 k0,CP0_ENTRYHI - ehb - - /* Disable RDHWR access */ - mtc0 zero, CP0_HWRENA - - /* load the guest context from VCPU and return */ - LONG_L $0, VCPU_R0(k1) - LONG_L $1, VCPU_R1(k1) - LONG_L $2, VCPU_R2(k1) - LONG_L $3, VCPU_R3(k1) - LONG_L $4, VCPU_R4(k1) - LONG_L $5, VCPU_R5(k1) - LONG_L $6, VCPU_R6(k1) - LONG_L $7, VCPU_R7(k1) - LONG_L $8, VCPU_R8(k1) - LONG_L $9, VCPU_R9(k1) - LONG_L $10, VCPU_R10(k1) - LONG_L $11, VCPU_R11(k1) - LONG_L $12, VCPU_R12(k1) - LONG_L $13, VCPU_R13(k1) - LONG_L $14, VCPU_R14(k1) - LONG_L $15, VCPU_R15(k1) - LONG_L $16, VCPU_R16(k1) - LONG_L $17, VCPU_R17(k1) - LONG_L $18, VCPU_R18(k1) - LONG_L $19, VCPU_R19(k1) - LONG_L $20, VCPU_R20(k1) - LONG_L $21, VCPU_R21(k1) - LONG_L $22, VCPU_R22(k1) - LONG_L $23, VCPU_R23(k1) - LONG_L $24, VCPU_R24(k1) - LONG_L $25, VCPU_R25(k1) - - /* $/k1 loaded later */ - LONG_L $28, VCPU_R28(k1) - LONG_L $29, VCPU_R29(k1) - LONG_L $30, VCPU_R30(k1) - LONG_L $31, VCPU_R31(k1) - -FEXPORT(__kvm_mips_skip_guest_restore) - LONG_L k0, VCPU_HI(k1) - mthi k0 - - LONG_L k0, VCPU_LO(k1) - mtlo k0 - - LONG_L k0, VCPU_R26(k1) - LONG_L k1, VCPU_R27(k1) - - eret - -__kvm_mips_return_to_host: - /* EBASE is already pointing to Linux */ - LONG_L k1, VCPU_HOST_STACK(k1) - INT_ADDIU k1,k1, -PT_SIZE - - /* Restore host DDATA_LO */ - LONG_L k0, PT_HOST_USERLOCAL(k1) - mtc0 k0, CP0_DDATA_LO - - /* Restore host ASID */ - LONG_L k0, PT_HOST_ASID(sp) - andi k0, 0xff - mtc0 k0,CP0_ENTRYHI - ehb - - /* Load context saved on the host stack */ - LONG_L $0, PT_R0(k1) - LONG_L $1, PT_R1(k1) - - /* - * r2/v0 is the return code, shift it down by 2 (arithmetic) - * to recover the err code - */ - INT_SRA k0, v0, 2 - move $2, k0 - - LONG_L $3, PT_R3(k1) - LONG_L $4, PT_R4(k1) - LONG_L $5, PT_R5(k1) - LONG_L $6, PT_R6(k1) - LONG_L $7, PT_R7(k1) - LONG_L $8, PT_R8(k1) - LONG_L $9, PT_R9(k1) - LONG_L $10, PT_R10(k1) - LONG_L $11, PT_R11(k1) - LONG_L $12, PT_R12(k1) - LONG_L $13, PT_R13(k1) - LONG_L $14, PT_R14(k1) - LONG_L $15, PT_R15(k1) - LONG_L $16, PT_R16(k1) - LONG_L $17, PT_R17(k1) - LONG_L $18, PT_R18(k1) - LONG_L $19, PT_R19(k1) - LONG_L $20, PT_R20(k1) - LONG_L $21, PT_R21(k1) - LONG_L $22, PT_R22(k1) - LONG_L $23, PT_R23(k1) - LONG_L $24, PT_R24(k1) - LONG_L $25, PT_R25(k1) - - /* Host k0/k1 were not saved */ - - LONG_L $28, PT_R28(k1) - LONG_L $29, PT_R29(k1) - LONG_L $30, PT_R30(k1) - - LONG_L k0, PT_HI(k1) - mthi k0 - - LONG_L k0, PT_LO(k1) - mtlo k0 - - /* Restore RDHWR access */ - PTR_LI k0, 0x2000000F - mtc0 k0, CP0_HWRENA - - /* Restore RA, which is the address we will return to */ - LONG_L ra, PT_R31(k1) - j ra - nop - -VECTOR_END(MIPSX(GuestExceptionEnd)) -.end MIPSX(GuestException) - -MIPSX(exceptions): - #### - ##### The exception handlers. - ##### - .word _C_LABEL(MIPSX(GuestException)) # 0 - .word _C_LABEL(MIPSX(GuestException)) # 1 - .word _C_LABEL(MIPSX(GuestException)) # 2 - .word _C_LABEL(MIPSX(GuestException)) # 3 - .word _C_LABEL(MIPSX(GuestException)) # 4 - .word _C_LABEL(MIPSX(GuestException)) # 5 - .word _C_LABEL(MIPSX(GuestException)) # 6 - .word _C_LABEL(MIPSX(GuestException)) # 7 - .word _C_LABEL(MIPSX(GuestException)) # 8 - .word _C_LABEL(MIPSX(GuestException)) # 9 - .word _C_LABEL(MIPSX(GuestException)) # 10 - .word _C_LABEL(MIPSX(GuestException)) # 11 - .word _C_LABEL(MIPSX(GuestException)) # 12 - .word _C_LABEL(MIPSX(GuestException)) # 13 - .word _C_LABEL(MIPSX(GuestException)) # 14 - .word _C_LABEL(MIPSX(GuestException)) # 15 - .word _C_LABEL(MIPSX(GuestException)) # 16 - .word _C_LABEL(MIPSX(GuestException)) # 17 - .word _C_LABEL(MIPSX(GuestException)) # 18 - .word _C_LABEL(MIPSX(GuestException)) # 19 - .word _C_LABEL(MIPSX(GuestException)) # 20 - .word _C_LABEL(MIPSX(GuestException)) # 21 - .word _C_LABEL(MIPSX(GuestException)) # 22 - .word _C_LABEL(MIPSX(GuestException)) # 23 - .word _C_LABEL(MIPSX(GuestException)) # 24 - .word _C_LABEL(MIPSX(GuestException)) # 25 - .word _C_LABEL(MIPSX(GuestException)) # 26 - .word _C_LABEL(MIPSX(GuestException)) # 27 - .word _C_LABEL(MIPSX(GuestException)) # 28 - .word _C_LABEL(MIPSX(GuestException)) # 29 - .word _C_LABEL(MIPSX(GuestException)) # 30 - .word _C_LABEL(MIPSX(GuestException)) # 31 diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c deleted file mode 100644 index 289b4d2ae45c..000000000000 --- a/arch/mips/kvm/kvm_mips.c +++ /dev/null @@ -1,1218 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: MIPS specific KVM APIs - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "kvm_mips_int.h" -#include "kvm_mips_comm.h" - -#define CREATE_TRACE_POINTS -#include "trace.h" - -#ifndef VECTORSPACING -#define VECTORSPACING 0x100 /* for EI/VI mode */ -#endif - -#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x) -struct kvm_stats_debugfs_item debugfs_entries[] = { - { "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU }, - { "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU }, - { "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU }, - { "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU }, - { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU }, - { "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU }, - { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU }, - { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU }, - { "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU }, - { "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU }, - { "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU }, - { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU }, - { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU }, - { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU }, - { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU }, - {NULL} -}; - -static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu) -{ - int i; - - for_each_possible_cpu(i) { - vcpu->arch.guest_kernel_asid[i] = 0; - vcpu->arch.guest_user_asid[i] = 0; - } - - return 0; -} - -/* - * XXXKYMA: We are simulatoring a processor that has the WII bit set in - * Config7, so we are "runnable" if interrupts are pending - */ -int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) -{ - return !!(vcpu->arch.pending_exceptions); -} - -int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) -{ - return 1; -} - -int kvm_arch_hardware_enable(void *garbage) -{ - return 0; -} - -void kvm_arch_hardware_disable(void *garbage) -{ -} - -int kvm_arch_hardware_setup(void) -{ - return 0; -} - -void kvm_arch_hardware_unsetup(void) -{ -} - -void kvm_arch_check_processor_compat(void *rtn) -{ - *(int *)rtn = 0; -} - -static void kvm_mips_init_tlbs(struct kvm *kvm) -{ - unsigned long wired; - - /* - * Add a wired entry to the TLB, it is used to map the commpage to - * the Guest kernel - */ - wired = read_c0_wired(); - write_c0_wired(wired + 1); - mtc0_tlbw_hazard(); - kvm->arch.commpage_tlb = wired; - - kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(), - kvm->arch.commpage_tlb); -} - -static void kvm_mips_init_vm_percpu(void *arg) -{ - struct kvm *kvm = (struct kvm *)arg; - - kvm_mips_init_tlbs(kvm); - kvm_mips_callbacks->vm_init(kvm); - -} - -int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) -{ - if (atomic_inc_return(&kvm_mips_instance) == 1) { - kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n", - __func__); - on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1); - } - - return 0; -} - -void kvm_mips_free_vcpus(struct kvm *kvm) -{ - unsigned int i; - struct kvm_vcpu *vcpu; - - /* Put the pages we reserved for the guest pmap */ - for (i = 0; i < kvm->arch.guest_pmap_npages; i++) { - if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE) - kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]); - } - kfree(kvm->arch.guest_pmap); - - kvm_for_each_vcpu(i, vcpu, kvm) { - kvm_arch_vcpu_free(vcpu); - } - - mutex_lock(&kvm->lock); - - for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) - kvm->vcpus[i] = NULL; - - atomic_set(&kvm->online_vcpus, 0); - - mutex_unlock(&kvm->lock); -} - -void kvm_arch_sync_events(struct kvm *kvm) -{ -} - -static void kvm_mips_uninit_tlbs(void *arg) -{ - /* Restore wired count */ - write_c0_wired(0); - mtc0_tlbw_hazard(); - /* Clear out all the TLBs */ - kvm_local_flush_tlb_all(); -} - -void kvm_arch_destroy_vm(struct kvm *kvm) -{ - kvm_mips_free_vcpus(kvm); - - /* If this is the last instance, restore wired count */ - if (atomic_dec_return(&kvm_mips_instance) == 0) { - kvm_debug("%s: last KVM instance, restoring TLB parameters\n", - __func__); - on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1); - } -} - -long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) -{ - return -ENOIOCTLCMD; -} - -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) -{ -} - -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, - unsigned long npages) -{ - return 0; -} - -void kvm_arch_memslots_updated(struct kvm *kvm) -{ -} - -int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) -{ - return 0; -} - -void kvm_arch_commit_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - enum kvm_mr_change change) -{ - unsigned long npages = 0; - int i; - - kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n", - __func__, kvm, mem->slot, mem->guest_phys_addr, - mem->memory_size, mem->userspace_addr); - - /* Setup Guest PMAP table */ - if (!kvm->arch.guest_pmap) { - if (mem->slot == 0) - npages = mem->memory_size >> PAGE_SHIFT; - - if (npages) { - kvm->arch.guest_pmap_npages = npages; - kvm->arch.guest_pmap = - kzalloc(npages * sizeof(unsigned long), GFP_KERNEL); - - if (!kvm->arch.guest_pmap) { - kvm_err("Failed to allocate guest PMAP"); - return; - } - - kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n", - npages, kvm->arch.guest_pmap); - - /* Now setup the page table */ - for (i = 0; i < npages; i++) - kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE; - } - } -} - -void kvm_arch_flush_shadow_all(struct kvm *kvm) -{ -} - -void kvm_arch_flush_shadow_memslot(struct kvm *kvm, - struct kvm_memory_slot *slot) -{ -} - -void kvm_arch_flush_shadow(struct kvm *kvm) -{ -} - -struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) -{ - int err, size, offset; - void *gebase; - int i; - - struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); - - if (!vcpu) { - err = -ENOMEM; - goto out; - } - - err = kvm_vcpu_init(vcpu, kvm, id); - - if (err) - goto out_free_cpu; - - kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu); - - /* - * Allocate space for host mode exception handlers that handle - * guest mode exits - */ - if (cpu_has_veic || cpu_has_vint) - size = 0x200 + VECTORSPACING * 64; - else - size = 0x4000; - - /* Save Linux EBASE */ - vcpu->arch.host_ebase = (void *)read_c0_ebase(); - - gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL); - - if (!gebase) { - err = -ENOMEM; - goto out_free_cpu; - } - kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n", - ALIGN(size, PAGE_SIZE), gebase); - - /* Save new ebase */ - vcpu->arch.guest_ebase = gebase; - - /* Copy L1 Guest Exception handler to correct offset */ - - /* TLB Refill, EXL = 0 */ - memcpy(gebase, mips32_exception, - mips32_exceptionEnd - mips32_exception); - - /* General Exception Entry point */ - memcpy(gebase + 0x180, mips32_exception, - mips32_exceptionEnd - mips32_exception); - - /* For vectored interrupts poke the exception code @ all offsets 0-7 */ - for (i = 0; i < 8; i++) { - kvm_debug("L1 Vectored handler @ %p\n", - gebase + 0x200 + (i * VECTORSPACING)); - memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception, - mips32_exceptionEnd - mips32_exception); - } - - /* General handler, relocate to unmapped space for sanity's sake */ - offset = 0x2000; - kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n", - gebase + offset, - mips32_GuestExceptionEnd - mips32_GuestException); - - memcpy(gebase + offset, mips32_GuestException, - mips32_GuestExceptionEnd - mips32_GuestException); - - /* Invalidate the icache for these ranges */ - local_flush_icache_range((unsigned long)gebase, - (unsigned long)gebase + ALIGN(size, PAGE_SIZE)); - - /* - * Allocate comm page for guest kernel, a TLB will be reserved for - * mapping GVA @ 0xFFFF8000 to this page - */ - vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL); - - if (!vcpu->arch.kseg0_commpage) { - err = -ENOMEM; - goto out_free_gebase; - } - - kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage); - kvm_mips_commpage_init(vcpu); - - /* Init */ - vcpu->arch.last_sched_cpu = -1; - - /* Start off the timer */ - kvm_mips_init_count(vcpu); - - return vcpu; - -out_free_gebase: - kfree(gebase); - -out_free_cpu: - kfree(vcpu); - -out: - return ERR_PTR(err); -} - -void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) -{ - hrtimer_cancel(&vcpu->arch.comparecount_timer); - - kvm_vcpu_uninit(vcpu); - - kvm_mips_dump_stats(vcpu); - - kfree(vcpu->arch.guest_ebase); - kfree(vcpu->arch.kseg0_commpage); -} - -void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) -{ - kvm_arch_vcpu_free(vcpu); -} - -int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, - struct kvm_guest_debug *dbg) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) -{ - int r = 0; - sigset_t sigsaved; - - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); - - if (vcpu->mmio_needed) { - if (!vcpu->mmio_is_write) - kvm_mips_complete_mmio_load(vcpu, run); - vcpu->mmio_needed = 0; - } - - local_irq_disable(); - /* Check if we have any exceptions/interrupts pending */ - kvm_mips_deliver_interrupts(vcpu, - kvm_read_c0_guest_cause(vcpu->arch.cop0)); - - kvm_guest_enter(); - - r = __kvm_mips_vcpu_run(run, vcpu); - - kvm_guest_exit(); - local_irq_enable(); - - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &sigsaved, NULL); - - return r; -} - -int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq) -{ - int intr = (int)irq->irq; - struct kvm_vcpu *dvcpu = NULL; - - if (intr == 3 || intr == -3 || intr == 4 || intr == -4) - kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu, - (int)intr); - - if (irq->cpu == -1) - dvcpu = vcpu; - else - dvcpu = vcpu->kvm->vcpus[irq->cpu]; - - if (intr == 2 || intr == 3 || intr == 4) { - kvm_mips_callbacks->queue_io_int(dvcpu, irq); - - } else if (intr == -2 || intr == -3 || intr == -4) { - kvm_mips_callbacks->dequeue_io_int(dvcpu, irq); - } else { - kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__, - irq->cpu, irq->irq); - return -EINVAL; - } - - dvcpu->arch.wait = 0; - - if (waitqueue_active(&dvcpu->wq)) - wake_up_interruptible(&dvcpu->wq); - - return 0; -} - -int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) -{ - return -ENOIOCTLCMD; -} - -static u64 kvm_mips_get_one_regs[] = { - KVM_REG_MIPS_R0, - KVM_REG_MIPS_R1, - KVM_REG_MIPS_R2, - KVM_REG_MIPS_R3, - KVM_REG_MIPS_R4, - KVM_REG_MIPS_R5, - KVM_REG_MIPS_R6, - KVM_REG_MIPS_R7, - KVM_REG_MIPS_R8, - KVM_REG_MIPS_R9, - KVM_REG_MIPS_R10, - KVM_REG_MIPS_R11, - KVM_REG_MIPS_R12, - KVM_REG_MIPS_R13, - KVM_REG_MIPS_R14, - KVM_REG_MIPS_R15, - KVM_REG_MIPS_R16, - KVM_REG_MIPS_R17, - KVM_REG_MIPS_R18, - KVM_REG_MIPS_R19, - KVM_REG_MIPS_R20, - KVM_REG_MIPS_R21, - KVM_REG_MIPS_R22, - KVM_REG_MIPS_R23, - KVM_REG_MIPS_R24, - KVM_REG_MIPS_R25, - KVM_REG_MIPS_R26, - KVM_REG_MIPS_R27, - KVM_REG_MIPS_R28, - KVM_REG_MIPS_R29, - KVM_REG_MIPS_R30, - KVM_REG_MIPS_R31, - - KVM_REG_MIPS_HI, - KVM_REG_MIPS_LO, - KVM_REG_MIPS_PC, - - KVM_REG_MIPS_CP0_INDEX, - KVM_REG_MIPS_CP0_CONTEXT, - KVM_REG_MIPS_CP0_USERLOCAL, - KVM_REG_MIPS_CP0_PAGEMASK, - KVM_REG_MIPS_CP0_WIRED, - KVM_REG_MIPS_CP0_HWRENA, - KVM_REG_MIPS_CP0_BADVADDR, - KVM_REG_MIPS_CP0_COUNT, - KVM_REG_MIPS_CP0_ENTRYHI, - KVM_REG_MIPS_CP0_COMPARE, - KVM_REG_MIPS_CP0_STATUS, - KVM_REG_MIPS_CP0_CAUSE, - KVM_REG_MIPS_CP0_EPC, - KVM_REG_MIPS_CP0_CONFIG, - KVM_REG_MIPS_CP0_CONFIG1, - KVM_REG_MIPS_CP0_CONFIG2, - KVM_REG_MIPS_CP0_CONFIG3, - KVM_REG_MIPS_CP0_CONFIG7, - KVM_REG_MIPS_CP0_ERROREPC, - - KVM_REG_MIPS_COUNT_CTL, - KVM_REG_MIPS_COUNT_RESUME, - KVM_REG_MIPS_COUNT_HZ, -}; - -static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, - const struct kvm_one_reg *reg) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - int ret; - s64 v; - - switch (reg->id) { - case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31: - v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0]; - break; - case KVM_REG_MIPS_HI: - v = (long)vcpu->arch.hi; - break; - case KVM_REG_MIPS_LO: - v = (long)vcpu->arch.lo; - break; - case KVM_REG_MIPS_PC: - v = (long)vcpu->arch.pc; - break; - - case KVM_REG_MIPS_CP0_INDEX: - v = (long)kvm_read_c0_guest_index(cop0); - break; - case KVM_REG_MIPS_CP0_CONTEXT: - v = (long)kvm_read_c0_guest_context(cop0); - break; - case KVM_REG_MIPS_CP0_USERLOCAL: - v = (long)kvm_read_c0_guest_userlocal(cop0); - break; - case KVM_REG_MIPS_CP0_PAGEMASK: - v = (long)kvm_read_c0_guest_pagemask(cop0); - break; - case KVM_REG_MIPS_CP0_WIRED: - v = (long)kvm_read_c0_guest_wired(cop0); - break; - case KVM_REG_MIPS_CP0_HWRENA: - v = (long)kvm_read_c0_guest_hwrena(cop0); - break; - case KVM_REG_MIPS_CP0_BADVADDR: - v = (long)kvm_read_c0_guest_badvaddr(cop0); - break; - case KVM_REG_MIPS_CP0_ENTRYHI: - v = (long)kvm_read_c0_guest_entryhi(cop0); - break; - case KVM_REG_MIPS_CP0_COMPARE: - v = (long)kvm_read_c0_guest_compare(cop0); - break; - case KVM_REG_MIPS_CP0_STATUS: - v = (long)kvm_read_c0_guest_status(cop0); - break; - case KVM_REG_MIPS_CP0_CAUSE: - v = (long)kvm_read_c0_guest_cause(cop0); - break; - case KVM_REG_MIPS_CP0_EPC: - v = (long)kvm_read_c0_guest_epc(cop0); - break; - case KVM_REG_MIPS_CP0_ERROREPC: - v = (long)kvm_read_c0_guest_errorepc(cop0); - break; - case KVM_REG_MIPS_CP0_CONFIG: - v = (long)kvm_read_c0_guest_config(cop0); - break; - case KVM_REG_MIPS_CP0_CONFIG1: - v = (long)kvm_read_c0_guest_config1(cop0); - break; - case KVM_REG_MIPS_CP0_CONFIG2: - v = (long)kvm_read_c0_guest_config2(cop0); - break; - case KVM_REG_MIPS_CP0_CONFIG3: - v = (long)kvm_read_c0_guest_config3(cop0); - break; - case KVM_REG_MIPS_CP0_CONFIG7: - v = (long)kvm_read_c0_guest_config7(cop0); - break; - /* registers to be handled specially */ - case KVM_REG_MIPS_CP0_COUNT: - case KVM_REG_MIPS_COUNT_CTL: - case KVM_REG_MIPS_COUNT_RESUME: - case KVM_REG_MIPS_COUNT_HZ: - ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v); - if (ret) - return ret; - break; - default: - return -EINVAL; - } - if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { - u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; - - return put_user(v, uaddr64); - } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { - u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; - u32 v32 = (u32)v; - - return put_user(v32, uaddr32); - } else { - return -EINVAL; - } -} - -static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, - const struct kvm_one_reg *reg) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - u64 v; - - if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { - u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; - - if (get_user(v, uaddr64) != 0) - return -EFAULT; - } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { - u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; - s32 v32; - - if (get_user(v32, uaddr32) != 0) - return -EFAULT; - v = (s64)v32; - } else { - return -EINVAL; - } - - switch (reg->id) { - case KVM_REG_MIPS_R0: - /* Silently ignore requests to set $0 */ - break; - case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31: - vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v; - break; - case KVM_REG_MIPS_HI: - vcpu->arch.hi = v; - break; - case KVM_REG_MIPS_LO: - vcpu->arch.lo = v; - break; - case KVM_REG_MIPS_PC: - vcpu->arch.pc = v; - break; - - case KVM_REG_MIPS_CP0_INDEX: - kvm_write_c0_guest_index(cop0, v); - break; - case KVM_REG_MIPS_CP0_CONTEXT: - kvm_write_c0_guest_context(cop0, v); - break; - case KVM_REG_MIPS_CP0_USERLOCAL: - kvm_write_c0_guest_userlocal(cop0, v); - break; - case KVM_REG_MIPS_CP0_PAGEMASK: - kvm_write_c0_guest_pagemask(cop0, v); - break; - case KVM_REG_MIPS_CP0_WIRED: - kvm_write_c0_guest_wired(cop0, v); - break; - case KVM_REG_MIPS_CP0_HWRENA: - kvm_write_c0_guest_hwrena(cop0, v); - break; - case KVM_REG_MIPS_CP0_BADVADDR: - kvm_write_c0_guest_badvaddr(cop0, v); - break; - case KVM_REG_MIPS_CP0_ENTRYHI: - kvm_write_c0_guest_entryhi(cop0, v); - break; - case KVM_REG_MIPS_CP0_STATUS: - kvm_write_c0_guest_status(cop0, v); - break; - case KVM_REG_MIPS_CP0_EPC: - kvm_write_c0_guest_epc(cop0, v); - break; - case KVM_REG_MIPS_CP0_ERROREPC: - kvm_write_c0_guest_errorepc(cop0, v); - break; - /* registers to be handled specially */ - case KVM_REG_MIPS_CP0_COUNT: - case KVM_REG_MIPS_CP0_COMPARE: - case KVM_REG_MIPS_CP0_CAUSE: - case KVM_REG_MIPS_COUNT_CTL: - case KVM_REG_MIPS_COUNT_RESUME: - case KVM_REG_MIPS_COUNT_HZ: - return kvm_mips_callbacks->set_one_reg(vcpu, reg, v); - default: - return -EINVAL; - } - return 0; -} - -long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) -{ - struct kvm_vcpu *vcpu = filp->private_data; - void __user *argp = (void __user *)arg; - long r; - - switch (ioctl) { - case KVM_SET_ONE_REG: - case KVM_GET_ONE_REG: { - struct kvm_one_reg reg; - - if (copy_from_user(®, argp, sizeof(reg))) - return -EFAULT; - if (ioctl == KVM_SET_ONE_REG) - return kvm_mips_set_reg(vcpu, ®); - else - return kvm_mips_get_reg(vcpu, ®); - } - case KVM_GET_REG_LIST: { - struct kvm_reg_list __user *user_list = argp; - u64 __user *reg_dest; - struct kvm_reg_list reg_list; - unsigned n; - - if (copy_from_user(®_list, user_list, sizeof(reg_list))) - return -EFAULT; - n = reg_list.n; - reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs); - if (copy_to_user(user_list, ®_list, sizeof(reg_list))) - return -EFAULT; - if (n < reg_list.n) - return -E2BIG; - reg_dest = user_list->reg; - if (copy_to_user(reg_dest, kvm_mips_get_one_regs, - sizeof(kvm_mips_get_one_regs))) - return -EFAULT; - return 0; - } - case KVM_NMI: - /* Treat the NMI as a CPU reset */ - r = kvm_mips_reset_vcpu(vcpu); - break; - case KVM_INTERRUPT: - { - struct kvm_mips_interrupt irq; - - r = -EFAULT; - if (copy_from_user(&irq, argp, sizeof(irq))) - goto out; - - kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, - irq.irq); - - r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); - break; - } - default: - r = -ENOIOCTLCMD; - } - -out: - return r; -} - -/* Get (and clear) the dirty memory log for a memory slot. */ -int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) -{ - struct kvm_memory_slot *memslot; - unsigned long ga, ga_end; - int is_dirty = 0; - int r; - unsigned long n; - - mutex_lock(&kvm->slots_lock); - - r = kvm_get_dirty_log(kvm, log, &is_dirty); - if (r) - goto out; - - /* If nothing is dirty, don't bother messing with page tables. */ - if (is_dirty) { - memslot = &kvm->memslots->memslots[log->slot]; - - ga = memslot->base_gfn << PAGE_SHIFT; - ga_end = ga + (memslot->npages << PAGE_SHIFT); - - kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga, - ga_end); - - n = kvm_dirty_bitmap_bytes(memslot); - memset(memslot->dirty_bitmap, 0, n); - } - - r = 0; -out: - mutex_unlock(&kvm->slots_lock); - return r; - -} - -long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) -{ - long r; - - switch (ioctl) { - default: - r = -ENOIOCTLCMD; - } - - return r; -} - -int kvm_arch_init(void *opaque) -{ - if (kvm_mips_callbacks) { - kvm_err("kvm: module already exists\n"); - return -EEXIST; - } - - return kvm_mips_emulation_init(&kvm_mips_callbacks); -} - -void kvm_arch_exit(void) -{ - kvm_mips_callbacks = NULL; -} - -int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) -{ - return 0; -} - -int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - return -ENOIOCTLCMD; -} - -int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) -{ - return VM_FAULT_SIGBUS; -} - -int kvm_dev_ioctl_check_extension(long ext) -{ - int r; - - switch (ext) { - case KVM_CAP_ONE_REG: - r = 1; - break; - case KVM_CAP_COALESCED_MMIO: - r = KVM_COALESCED_MMIO_PAGE_OFFSET; - break; - default: - r = 0; - break; - } - return r; -} - -int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) -{ - return kvm_mips_pending_timer(vcpu); -} - -int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) -{ - int i; - struct mips_coproc *cop0; - - if (!vcpu) - return -1; - - kvm_debug("VCPU Register Dump:\n"); - kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc); - kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); - - for (i = 0; i < 32; i += 4) { - kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, - vcpu->arch.gprs[i], - vcpu->arch.gprs[i + 1], - vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); - } - kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi); - kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo); - - cop0 = vcpu->arch.cop0; - kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n", - kvm_read_c0_guest_status(cop0), - kvm_read_c0_guest_cause(cop0)); - - kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - int i; - - for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) - vcpu->arch.gprs[i] = regs->gpr[i]; - vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */ - vcpu->arch.hi = regs->hi; - vcpu->arch.lo = regs->lo; - vcpu->arch.pc = regs->pc; - - return 0; -} - -int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) - regs->gpr[i] = vcpu->arch.gprs[i]; - - regs->hi = vcpu->arch.hi; - regs->lo = vcpu->arch.lo; - regs->pc = vcpu->arch.pc; - - return 0; -} - -static void kvm_mips_comparecount_func(unsigned long data) -{ - struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; - - kvm_mips_callbacks->queue_timer_int(vcpu); - - vcpu->arch.wait = 0; - if (waitqueue_active(&vcpu->wq)) - wake_up_interruptible(&vcpu->wq); -} - -/* low level hrtimer wake routine */ -static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) -{ - struct kvm_vcpu *vcpu; - - vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer); - kvm_mips_comparecount_func((unsigned long) vcpu); - return kvm_mips_count_timeout(vcpu); -} - -int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) -{ - kvm_mips_callbacks->vcpu_init(vcpu); - hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC, - HRTIMER_MODE_REL); - vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup; - return 0; -} - -void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) -{ -} - -int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, - struct kvm_translation *tr) -{ - return 0; -} - -/* Initial guest state */ -int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) -{ - return kvm_mips_callbacks->vcpu_setup(vcpu); -} - -static void kvm_mips_set_c0_status(void) -{ - uint32_t status = read_c0_status(); - - if (cpu_has_fpu) - status |= (ST0_CU1); - - if (cpu_has_dsp) - status |= (ST0_MX); - - write_c0_status(status); - ehb(); -} - -/* - * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) - */ -int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) -{ - uint32_t cause = vcpu->arch.host_cp0_cause; - uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - /* Set a default exit reason */ - run->exit_reason = KVM_EXIT_UNKNOWN; - run->ready_for_interrupt_injection = 1; - - /* - * Set the appropriate status bits based on host CPU features, - * before we hit the scheduler - */ - kvm_mips_set_c0_status(); - - local_irq_enable(); - - kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n", - cause, opc, run, vcpu); - - /* - * Do a privilege check, if in UM most of these exit conditions end up - * causing an exception to be delivered to the Guest Kernel - */ - er = kvm_mips_check_privilege(cause, opc, run, vcpu); - if (er == EMULATE_PRIV_FAIL) { - goto skip_emul; - } else if (er == EMULATE_FAIL) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - goto skip_emul; - } - - switch (exccode) { - case T_INT: - kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc); - - ++vcpu->stat.int_exits; - trace_kvm_exit(vcpu, INT_EXITS); - - if (need_resched()) - cond_resched(); - - ret = RESUME_GUEST; - break; - - case T_COP_UNUSABLE: - kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc); - - ++vcpu->stat.cop_unusable_exits; - trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS); - ret = kvm_mips_callbacks->handle_cop_unusable(vcpu); - /* XXXKYMA: Might need to return to user space */ - if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) - ret = RESUME_HOST; - break; - - case T_TLB_MOD: - ++vcpu->stat.tlbmod_exits; - trace_kvm_exit(vcpu, TLBMOD_EXITS); - ret = kvm_mips_callbacks->handle_tlb_mod(vcpu); - break; - - case T_TLB_ST_MISS: - kvm_debug("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n", - cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, - badvaddr); - - ++vcpu->stat.tlbmiss_st_exits; - trace_kvm_exit(vcpu, TLBMISS_ST_EXITS); - ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu); - break; - - case T_TLB_LD_MISS: - kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - - ++vcpu->stat.tlbmiss_ld_exits; - trace_kvm_exit(vcpu, TLBMISS_LD_EXITS); - ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu); - break; - - case T_ADDR_ERR_ST: - ++vcpu->stat.addrerr_st_exits; - trace_kvm_exit(vcpu, ADDRERR_ST_EXITS); - ret = kvm_mips_callbacks->handle_addr_err_st(vcpu); - break; - - case T_ADDR_ERR_LD: - ++vcpu->stat.addrerr_ld_exits; - trace_kvm_exit(vcpu, ADDRERR_LD_EXITS); - ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu); - break; - - case T_SYSCALL: - ++vcpu->stat.syscall_exits; - trace_kvm_exit(vcpu, SYSCALL_EXITS); - ret = kvm_mips_callbacks->handle_syscall(vcpu); - break; - - case T_RES_INST: - ++vcpu->stat.resvd_inst_exits; - trace_kvm_exit(vcpu, RESVD_INST_EXITS); - ret = kvm_mips_callbacks->handle_res_inst(vcpu); - break; - - case T_BREAK: - ++vcpu->stat.break_inst_exits; - trace_kvm_exit(vcpu, BREAK_INST_EXITS); - ret = kvm_mips_callbacks->handle_break(vcpu); - break; - - default: - kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n", - exccode, opc, kvm_get_inst(opc, vcpu), badvaddr, - kvm_read_c0_guest_status(vcpu->arch.cop0)); - kvm_arch_vcpu_dump_regs(vcpu); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - break; - - } - -skip_emul: - local_irq_disable(); - - if (er == EMULATE_DONE && !(ret & RESUME_HOST)) - kvm_mips_deliver_interrupts(vcpu, cause); - - if (!(ret & RESUME_HOST)) { - /* Only check for signals if not already exiting to userspace */ - if (signal_pending(current)) { - run->exit_reason = KVM_EXIT_INTR; - ret = (-EINTR << 2) | RESUME_HOST; - ++vcpu->stat.signal_exits; - trace_kvm_exit(vcpu, SIGNAL_EXITS); - } - } - - return ret; -} - -int __init kvm_mips_init(void) -{ - int ret; - - ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); - - if (ret) - return ret; - - /* - * On MIPS, kernel modules are executed from "mapped space", which - * requires TLBs. The TLB handling code is statically linked with - * the rest of the kernel (kvm_tlb.c) to avoid the possibility of - * double faulting. The issue is that the TLB code references - * routines that are part of the the KVM module, which are only - * available once the module is loaded. - */ - kvm_mips_gfn_to_pfn = gfn_to_pfn; - kvm_mips_release_pfn_clean = kvm_release_pfn_clean; - kvm_mips_is_error_pfn = is_error_pfn; - - pr_info("KVM/MIPS Initialized\n"); - return 0; -} - -void __exit kvm_mips_exit(void) -{ - kvm_exit(); - - kvm_mips_gfn_to_pfn = NULL; - kvm_mips_release_pfn_clean = NULL; - kvm_mips_is_error_pfn = NULL; - - pr_info("KVM/MIPS unloaded\n"); -} - -module_init(kvm_mips_init); -module_exit(kvm_mips_exit); - -EXPORT_TRACEPOINT_SYMBOL(kvm_exit); diff --git a/arch/mips/kvm/kvm_mips_comm.h b/arch/mips/kvm/kvm_mips_comm.h deleted file mode 100644 index 08c5fa2bbc0f..000000000000 --- a/arch/mips/kvm/kvm_mips_comm.h +++ /dev/null @@ -1,24 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: commpage: mapped into get kernel space - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#ifndef __KVM_MIPS_COMMPAGE_H__ -#define __KVM_MIPS_COMMPAGE_H__ - -struct kvm_mips_commpage { - /* COP0 state is mapped into Guest kernel via commpage */ - struct mips_coproc cop0; -}; - -#define KVM_MIPS_COMM_EIDI_OFFSET 0x0 - -extern void kvm_mips_commpage_init(struct kvm_vcpu *vcpu); - -#endif /* __KVM_MIPS_COMMPAGE_H__ */ diff --git a/arch/mips/kvm/kvm_mips_commpage.c b/arch/mips/kvm/kvm_mips_commpage.c deleted file mode 100644 index 4b5612b34fef..000000000000 --- a/arch/mips/kvm/kvm_mips_commpage.c +++ /dev/null @@ -1,36 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * commpage, currently used for Virtual COP0 registers. - * Mapped into the guest kernel @ 0x0. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "kvm_mips_comm.h" - -void kvm_mips_commpage_init(struct kvm_vcpu *vcpu) -{ - struct kvm_mips_commpage *page = vcpu->arch.kseg0_commpage; - - memset(page, 0, sizeof(struct kvm_mips_commpage)); - - /* Specific init values for fields */ - vcpu->arch.cop0 = &page->cop0; - memset(vcpu->arch.cop0, 0, sizeof(struct mips_coproc)); -} diff --git a/arch/mips/kvm/kvm_mips_dyntrans.c b/arch/mips/kvm/kvm_mips_dyntrans.c deleted file mode 100644 index fa7184df5450..000000000000 --- a/arch/mips/kvm/kvm_mips_dyntrans.c +++ /dev/null @@ -1,148 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: Binary Patching for privileged instructions, reduces traps. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#include "kvm_mips_comm.h" - -#define SYNCI_TEMPLATE 0x041f0000 -#define SYNCI_BASE(x) (((x) >> 21) & 0x1f) -#define SYNCI_OFFSET ((x) & 0xffff) - -#define LW_TEMPLATE 0x8c000000 -#define CLEAR_TEMPLATE 0x00000020 -#define SW_TEMPLATE 0xac000000 - -int kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc, - struct kvm_vcpu *vcpu) -{ - int result = 0; - unsigned long kseg0_opc; - uint32_t synci_inst = 0x0; - - /* Replace the CACHE instruction, with a NOP */ - kseg0_opc = - CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa - (vcpu, (unsigned long) opc)); - memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t)); - local_flush_icache_range(kseg0_opc, kseg0_opc + 32); - - return result; -} - -/* - * Address based CACHE instructions are transformed into synci(s). A little - * heavy for just D-cache invalidates, but avoids an expensive trap - */ -int kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc, - struct kvm_vcpu *vcpu) -{ - int result = 0; - unsigned long kseg0_opc; - uint32_t synci_inst = SYNCI_TEMPLATE, base, offset; - - base = (inst >> 21) & 0x1f; - offset = inst & 0xffff; - synci_inst |= (base << 21); - synci_inst |= offset; - - kseg0_opc = - CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa - (vcpu, (unsigned long) opc)); - memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t)); - local_flush_icache_range(kseg0_opc, kseg0_opc + 32); - - return result; -} - -int kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) -{ - int32_t rt, rd, sel; - uint32_t mfc0_inst; - unsigned long kseg0_opc, flags; - - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; - - if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { - mfc0_inst = CLEAR_TEMPLATE; - mfc0_inst |= ((rt & 0x1f) << 16); - } else { - mfc0_inst = LW_TEMPLATE; - mfc0_inst |= ((rt & 0x1f) << 16); - mfc0_inst |= - offsetof(struct mips_coproc, - reg[rd][sel]) + offsetof(struct kvm_mips_commpage, - cop0); - } - - if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { - kseg0_opc = - CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa - (vcpu, (unsigned long) opc)); - memcpy((void *)kseg0_opc, (void *)&mfc0_inst, sizeof(uint32_t)); - local_flush_icache_range(kseg0_opc, kseg0_opc + 32); - } else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { - local_irq_save(flags); - memcpy((void *)opc, (void *)&mfc0_inst, sizeof(uint32_t)); - local_flush_icache_range((unsigned long)opc, - (unsigned long)opc + 32); - local_irq_restore(flags); - } else { - kvm_err("%s: Invalid address: %p\n", __func__, opc); - return -EFAULT; - } - - return 0; -} - -int kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu) -{ - int32_t rt, rd, sel; - uint32_t mtc0_inst = SW_TEMPLATE; - unsigned long kseg0_opc, flags; - - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; - - mtc0_inst |= ((rt & 0x1f) << 16); - mtc0_inst |= - offsetof(struct mips_coproc, - reg[rd][sel]) + offsetof(struct kvm_mips_commpage, cop0); - - if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { - kseg0_opc = - CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa - (vcpu, (unsigned long) opc)); - memcpy((void *)kseg0_opc, (void *)&mtc0_inst, sizeof(uint32_t)); - local_flush_icache_range(kseg0_opc, kseg0_opc + 32); - } else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { - local_irq_save(flags); - memcpy((void *)opc, (void *)&mtc0_inst, sizeof(uint32_t)); - local_flush_icache_range((unsigned long)opc, - (unsigned long)opc + 32); - local_irq_restore(flags); - } else { - kvm_err("%s: Invalid address: %p\n", __func__, opc); - return -EFAULT; - } - - return 0; -} diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c deleted file mode 100644 index f9b4f0fa425d..000000000000 --- a/arch/mips/kvm/kvm_mips_emul.c +++ /dev/null @@ -1,2324 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: Instruction/Exception emulation - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#undef CONFIG_MIPS_MT -#include -#define CONFIG_MIPS_MT - -#include "kvm_mips_opcode.h" -#include "kvm_mips_int.h" -#include "kvm_mips_comm.h" - -#include "trace.h" - -/* - * Compute the return address and do emulate branch simulation, if required. - * This function should be called only in branch delay slot active. - */ -unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, - unsigned long instpc) -{ - unsigned int dspcontrol; - union mips_instruction insn; - struct kvm_vcpu_arch *arch = &vcpu->arch; - long epc = instpc; - long nextpc = KVM_INVALID_INST; - - if (epc & 3) - goto unaligned; - - /* Read the instruction */ - insn.word = kvm_get_inst((uint32_t *) epc, vcpu); - - if (insn.word == KVM_INVALID_INST) - return KVM_INVALID_INST; - - switch (insn.i_format.opcode) { - /* jr and jalr are in r_format format. */ - case spec_op: - switch (insn.r_format.func) { - case jalr_op: - arch->gprs[insn.r_format.rd] = epc + 8; - /* Fall through */ - case jr_op: - nextpc = arch->gprs[insn.r_format.rs]; - break; - } - break; - - /* - * This group contains: - * bltz_op, bgez_op, bltzl_op, bgezl_op, - * bltzal_op, bgezal_op, bltzall_op, bgezall_op. - */ - case bcond_op: - switch (insn.i_format.rt) { - case bltz_op: - case bltzl_op: - if ((long)arch->gprs[insn.i_format.rs] < 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case bgez_op: - case bgezl_op: - if ((long)arch->gprs[insn.i_format.rs] >= 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case bltzal_op: - case bltzall_op: - arch->gprs[31] = epc + 8; - if ((long)arch->gprs[insn.i_format.rs] < 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case bgezal_op: - case bgezall_op: - arch->gprs[31] = epc + 8; - if ((long)arch->gprs[insn.i_format.rs] >= 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - case bposge32_op: - if (!cpu_has_dsp) - goto sigill; - - dspcontrol = rddsp(0x01); - - if (dspcontrol >= 32) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - } - break; - - /* These are unconditional and in j_format. */ - case jal_op: - arch->gprs[31] = instpc + 8; - case j_op: - epc += 4; - epc >>= 28; - epc <<= 28; - epc |= (insn.j_format.target << 2); - nextpc = epc; - break; - - /* These are conditional and in i_format. */ - case beq_op: - case beql_op: - if (arch->gprs[insn.i_format.rs] == - arch->gprs[insn.i_format.rt]) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case bne_op: - case bnel_op: - if (arch->gprs[insn.i_format.rs] != - arch->gprs[insn.i_format.rt]) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case blez_op: /* not really i_format */ - case blezl_op: - /* rt field assumed to be zero */ - if ((long)arch->gprs[insn.i_format.rs] <= 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - case bgtz_op: - case bgtzl_op: - /* rt field assumed to be zero */ - if ((long)arch->gprs[insn.i_format.rs] > 0) - epc = epc + 4 + (insn.i_format.simmediate << 2); - else - epc += 8; - nextpc = epc; - break; - - /* And now the FPA/cp1 branch instructions. */ - case cop1_op: - kvm_err("%s: unsupported cop1_op\n", __func__); - break; - } - - return nextpc; - -unaligned: - kvm_err("%s: unaligned epc\n", __func__); - return nextpc; - -sigill: - kvm_err("%s: DSP branch but not DSP ASE\n", __func__); - return nextpc; -} - -enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause) -{ - unsigned long branch_pc; - enum emulation_result er = EMULATE_DONE; - - if (cause & CAUSEF_BD) { - branch_pc = kvm_compute_return_epc(vcpu, vcpu->arch.pc); - if (branch_pc == KVM_INVALID_INST) { - er = EMULATE_FAIL; - } else { - vcpu->arch.pc = branch_pc; - kvm_debug("BD update_pc(): New PC: %#lx\n", - vcpu->arch.pc); - } - } else - vcpu->arch.pc += 4; - - kvm_debug("update_pc(): New PC: %#lx\n", vcpu->arch.pc); - - return er; -} - -/** - * kvm_mips_count_disabled() - Find whether the CP0_Count timer is disabled. - * @vcpu: Virtual CPU. - * - * Returns: 1 if the CP0_Count timer is disabled by either the guest - * CP0_Cause.DC bit or the count_ctl.DC bit. - * 0 otherwise (in which case CP0_Count timer is running). - */ -static inline int kvm_mips_count_disabled(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - - return (vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) || - (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC); -} - -/** - * kvm_mips_ktime_to_count() - Scale ktime_t to a 32-bit count. - * - * Caches the dynamic nanosecond bias in vcpu->arch.count_dyn_bias. - * - * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). - */ -static uint32_t kvm_mips_ktime_to_count(struct kvm_vcpu *vcpu, ktime_t now) -{ - s64 now_ns, periods; - u64 delta; - - now_ns = ktime_to_ns(now); - delta = now_ns + vcpu->arch.count_dyn_bias; - - if (delta >= vcpu->arch.count_period) { - /* If delta is out of safe range the bias needs adjusting */ - periods = div64_s64(now_ns, vcpu->arch.count_period); - vcpu->arch.count_dyn_bias = -periods * vcpu->arch.count_period; - /* Recalculate delta with new bias */ - delta = now_ns + vcpu->arch.count_dyn_bias; - } - - /* - * We've ensured that: - * delta < count_period - * - * Therefore the intermediate delta*count_hz will never overflow since - * at the boundary condition: - * delta = count_period - * delta = NSEC_PER_SEC * 2^32 / count_hz - * delta * count_hz = NSEC_PER_SEC * 2^32 - */ - return div_u64(delta * vcpu->arch.count_hz, NSEC_PER_SEC); -} - -/** - * kvm_mips_count_time() - Get effective current time. - * @vcpu: Virtual CPU. - * - * Get effective monotonic ktime. This is usually a straightforward ktime_get(), - * except when the master disable bit is set in count_ctl, in which case it is - * count_resume, i.e. the time that the count was disabled. - * - * Returns: Effective monotonic ktime for CP0_Count. - */ -static inline ktime_t kvm_mips_count_time(struct kvm_vcpu *vcpu) -{ - if (unlikely(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) - return vcpu->arch.count_resume; - - return ktime_get(); -} - -/** - * kvm_mips_read_count_running() - Read the current count value as if running. - * @vcpu: Virtual CPU. - * @now: Kernel time to read CP0_Count at. - * - * Returns the current guest CP0_Count register at time @now and handles if the - * timer interrupt is pending and hasn't been handled yet. - * - * Returns: The current value of the guest CP0_Count register. - */ -static uint32_t kvm_mips_read_count_running(struct kvm_vcpu *vcpu, ktime_t now) -{ - ktime_t expires; - int running; - - /* Is the hrtimer pending? */ - expires = hrtimer_get_expires(&vcpu->arch.comparecount_timer); - if (ktime_compare(now, expires) >= 0) { - /* - * Cancel it while we handle it so there's no chance of - * interference with the timeout handler. - */ - running = hrtimer_cancel(&vcpu->arch.comparecount_timer); - - /* Nothing should be waiting on the timeout */ - kvm_mips_callbacks->queue_timer_int(vcpu); - - /* - * Restart the timer if it was running based on the expiry time - * we read, so that we don't push it back 2 periods. - */ - if (running) { - expires = ktime_add_ns(expires, - vcpu->arch.count_period); - hrtimer_start(&vcpu->arch.comparecount_timer, expires, - HRTIMER_MODE_ABS); - } - } - - /* Return the biased and scaled guest CP0_Count */ - return vcpu->arch.count_bias + kvm_mips_ktime_to_count(vcpu, now); -} - -/** - * kvm_mips_read_count() - Read the current count value. - * @vcpu: Virtual CPU. - * - * Read the current guest CP0_Count value, taking into account whether the timer - * is stopped. - * - * Returns: The current guest CP0_Count value. - */ -uint32_t kvm_mips_read_count(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - - /* If count disabled just read static copy of count */ - if (kvm_mips_count_disabled(vcpu)) - return kvm_read_c0_guest_count(cop0); - - return kvm_mips_read_count_running(vcpu, ktime_get()); -} - -/** - * kvm_mips_freeze_hrtimer() - Safely stop the hrtimer. - * @vcpu: Virtual CPU. - * @count: Output pointer for CP0_Count value at point of freeze. - * - * Freeze the hrtimer safely and return both the ktime and the CP0_Count value - * at the point it was frozen. It is guaranteed that any pending interrupts at - * the point it was frozen are handled, and none after that point. - * - * This is useful where the time/CP0_Count is needed in the calculation of the - * new parameters. - * - * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). - * - * Returns: The ktime at the point of freeze. - */ -static ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, - uint32_t *count) -{ - ktime_t now; - - /* stop hrtimer before finding time */ - hrtimer_cancel(&vcpu->arch.comparecount_timer); - now = ktime_get(); - - /* find count at this point and handle pending hrtimer */ - *count = kvm_mips_read_count_running(vcpu, now); - - return now; -} - -/** - * kvm_mips_resume_hrtimer() - Resume hrtimer, updating expiry. - * @vcpu: Virtual CPU. - * @now: ktime at point of resume. - * @count: CP0_Count at point of resume. - * - * Resumes the timer and updates the timer expiry based on @now and @count. - * This can be used in conjunction with kvm_mips_freeze_timer() when timer - * parameters need to be changed. - * - * It is guaranteed that a timer interrupt immediately after resume will be - * handled, but not if CP_Compare is exactly at @count. That case is already - * handled by kvm_mips_freeze_timer(). - * - * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). - */ -static void kvm_mips_resume_hrtimer(struct kvm_vcpu *vcpu, - ktime_t now, uint32_t count) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - uint32_t compare; - u64 delta; - ktime_t expire; - - /* Calculate timeout (wrap 0 to 2^32) */ - compare = kvm_read_c0_guest_compare(cop0); - delta = (u64)(uint32_t)(compare - count - 1) + 1; - delta = div_u64(delta * NSEC_PER_SEC, vcpu->arch.count_hz); - expire = ktime_add_ns(now, delta); - - /* Update hrtimer to use new timeout */ - hrtimer_cancel(&vcpu->arch.comparecount_timer); - hrtimer_start(&vcpu->arch.comparecount_timer, expire, HRTIMER_MODE_ABS); -} - -/** - * kvm_mips_update_hrtimer() - Update next expiry time of hrtimer. - * @vcpu: Virtual CPU. - * - * Recalculates and updates the expiry time of the hrtimer. This can be used - * after timer parameters have been altered which do not depend on the time that - * the change occurs (in those cases kvm_mips_freeze_hrtimer() and - * kvm_mips_resume_hrtimer() are used directly). - * - * It is guaranteed that no timer interrupts will be lost in the process. - * - * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). - */ -static void kvm_mips_update_hrtimer(struct kvm_vcpu *vcpu) -{ - ktime_t now; - uint32_t count; - - /* - * freeze_hrtimer takes care of a timer interrupts <= count, and - * resume_hrtimer the hrtimer takes care of a timer interrupts > count. - */ - now = kvm_mips_freeze_hrtimer(vcpu, &count); - kvm_mips_resume_hrtimer(vcpu, now, count); -} - -/** - * kvm_mips_write_count() - Modify the count and update timer. - * @vcpu: Virtual CPU. - * @count: Guest CP0_Count value to set. - * - * Sets the CP0_Count value and updates the timer accordingly. - */ -void kvm_mips_write_count(struct kvm_vcpu *vcpu, uint32_t count) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - ktime_t now; - - /* Calculate bias */ - now = kvm_mips_count_time(vcpu); - vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); - - if (kvm_mips_count_disabled(vcpu)) - /* The timer's disabled, adjust the static count */ - kvm_write_c0_guest_count(cop0, count); - else - /* Update timeout */ - kvm_mips_resume_hrtimer(vcpu, now, count); -} - -/** - * kvm_mips_init_count() - Initialise timer. - * @vcpu: Virtual CPU. - * - * Initialise the timer to a sensible frequency, namely 100MHz, zero it, and set - * it going if it's enabled. - */ -void kvm_mips_init_count(struct kvm_vcpu *vcpu) -{ - /* 100 MHz */ - vcpu->arch.count_hz = 100*1000*1000; - vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, - vcpu->arch.count_hz); - vcpu->arch.count_dyn_bias = 0; - - /* Starting at 0 */ - kvm_mips_write_count(vcpu, 0); -} - -/** - * kvm_mips_set_count_hz() - Update the frequency of the timer. - * @vcpu: Virtual CPU. - * @count_hz: Frequency of CP0_Count timer in Hz. - * - * Change the frequency of the CP0_Count timer. This is done atomically so that - * CP0_Count is continuous and no timer interrupt is lost. - * - * Returns: -EINVAL if @count_hz is out of range. - * 0 on success. - */ -int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - int dc; - ktime_t now; - u32 count; - - /* ensure the frequency is in a sensible range... */ - if (count_hz <= 0 || count_hz > NSEC_PER_SEC) - return -EINVAL; - /* ... and has actually changed */ - if (vcpu->arch.count_hz == count_hz) - return 0; - - /* Safely freeze timer so we can keep it continuous */ - dc = kvm_mips_count_disabled(vcpu); - if (dc) { - now = kvm_mips_count_time(vcpu); - count = kvm_read_c0_guest_count(cop0); - } else { - now = kvm_mips_freeze_hrtimer(vcpu, &count); - } - - /* Update the frequency */ - vcpu->arch.count_hz = count_hz; - vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, count_hz); - vcpu->arch.count_dyn_bias = 0; - - /* Calculate adjusted bias so dynamic count is unchanged */ - vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); - - /* Update and resume hrtimer */ - if (!dc) - kvm_mips_resume_hrtimer(vcpu, now, count); - return 0; -} - -/** - * kvm_mips_write_compare() - Modify compare and update timer. - * @vcpu: Virtual CPU. - * @compare: New CP0_Compare value. - * - * Update CP0_Compare to a new value and update the timeout. - */ -void kvm_mips_write_compare(struct kvm_vcpu *vcpu, uint32_t compare) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - - /* if unchanged, must just be an ack */ - if (kvm_read_c0_guest_compare(cop0) == compare) - return; - - /* Update compare */ - kvm_write_c0_guest_compare(cop0, compare); - - /* Update timeout if count enabled */ - if (!kvm_mips_count_disabled(vcpu)) - kvm_mips_update_hrtimer(vcpu); -} - -/** - * kvm_mips_count_disable() - Disable count. - * @vcpu: Virtual CPU. - * - * Disable the CP0_Count timer. A timer interrupt on or before the final stop - * time will be handled but not after. - * - * Assumes CP0_Count was previously enabled but now Guest.CP0_Cause.DC or - * count_ctl.DC has been set (count disabled). - * - * Returns: The time that the timer was stopped. - */ -static ktime_t kvm_mips_count_disable(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - uint32_t count; - ktime_t now; - - /* Stop hrtimer */ - hrtimer_cancel(&vcpu->arch.comparecount_timer); - - /* Set the static count from the dynamic count, handling pending TI */ - now = ktime_get(); - count = kvm_mips_read_count_running(vcpu, now); - kvm_write_c0_guest_count(cop0, count); - - return now; -} - -/** - * kvm_mips_count_disable_cause() - Disable count using CP0_Cause.DC. - * @vcpu: Virtual CPU. - * - * Disable the CP0_Count timer and set CP0_Cause.DC. A timer interrupt on or - * before the final stop time will be handled if the timer isn't disabled by - * count_ctl.DC, but not after. - * - * Assumes CP0_Cause.DC is clear (count enabled). - */ -void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - - kvm_set_c0_guest_cause(cop0, CAUSEF_DC); - if (!(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) - kvm_mips_count_disable(vcpu); -} - -/** - * kvm_mips_count_enable_cause() - Enable count using CP0_Cause.DC. - * @vcpu: Virtual CPU. - * - * Enable the CP0_Count timer and clear CP0_Cause.DC. A timer interrupt after - * the start time will be handled if the timer isn't disabled by count_ctl.DC, - * potentially before even returning, so the caller should be careful with - * ordering of CP0_Cause modifications so as not to lose it. - * - * Assumes CP0_Cause.DC is set (count disabled). - */ -void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - uint32_t count; - - kvm_clear_c0_guest_cause(cop0, CAUSEF_DC); - - /* - * Set the dynamic count to match the static count. - * This starts the hrtimer if count_ctl.DC allows it. - * Otherwise it conveniently updates the biases. - */ - count = kvm_read_c0_guest_count(cop0); - kvm_mips_write_count(vcpu, count); -} - -/** - * kvm_mips_set_count_ctl() - Update the count control KVM register. - * @vcpu: Virtual CPU. - * @count_ctl: Count control register new value. - * - * Set the count control KVM register. The timer is updated accordingly. - * - * Returns: -EINVAL if reserved bits are set. - * 0 on success. - */ -int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - s64 changed = count_ctl ^ vcpu->arch.count_ctl; - s64 delta; - ktime_t expire, now; - uint32_t count, compare; - - /* Only allow defined bits to be changed */ - if (changed & ~(s64)(KVM_REG_MIPS_COUNT_CTL_DC)) - return -EINVAL; - - /* Apply new value */ - vcpu->arch.count_ctl = count_ctl; - - /* Master CP0_Count disable */ - if (changed & KVM_REG_MIPS_COUNT_CTL_DC) { - /* Is CP0_Cause.DC already disabling CP0_Count? */ - if (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC) { - if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) - /* Just record the current time */ - vcpu->arch.count_resume = ktime_get(); - } else if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) { - /* disable timer and record current time */ - vcpu->arch.count_resume = kvm_mips_count_disable(vcpu); - } else { - /* - * Calculate timeout relative to static count at resume - * time (wrap 0 to 2^32). - */ - count = kvm_read_c0_guest_count(cop0); - compare = kvm_read_c0_guest_compare(cop0); - delta = (u64)(uint32_t)(compare - count - 1) + 1; - delta = div_u64(delta * NSEC_PER_SEC, - vcpu->arch.count_hz); - expire = ktime_add_ns(vcpu->arch.count_resume, delta); - - /* Handle pending interrupt */ - now = ktime_get(); - if (ktime_compare(now, expire) >= 0) - /* Nothing should be waiting on the timeout */ - kvm_mips_callbacks->queue_timer_int(vcpu); - - /* Resume hrtimer without changing bias */ - count = kvm_mips_read_count_running(vcpu, now); - kvm_mips_resume_hrtimer(vcpu, now, count); - } - } - - return 0; -} - -/** - * kvm_mips_set_count_resume() - Update the count resume KVM register. - * @vcpu: Virtual CPU. - * @count_resume: Count resume register new value. - * - * Set the count resume KVM register. - * - * Returns: -EINVAL if out of valid range (0..now). - * 0 on success. - */ -int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume) -{ - /* - * It doesn't make sense for the resume time to be in the future, as it - * would be possible for the next interrupt to be more than a full - * period in the future. - */ - if (count_resume < 0 || count_resume > ktime_to_ns(ktime_get())) - return -EINVAL; - - vcpu->arch.count_resume = ns_to_ktime(count_resume); - return 0; -} - -/** - * kvm_mips_count_timeout() - Push timer forward on timeout. - * @vcpu: Virtual CPU. - * - * Handle an hrtimer event by push the hrtimer forward a period. - * - * Returns: The hrtimer_restart value to return to the hrtimer subsystem. - */ -enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu) -{ - /* Add the Count period to the current expiry time */ - hrtimer_add_expires_ns(&vcpu->arch.comparecount_timer, - vcpu->arch.count_period); - return HRTIMER_RESTART; -} - -enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - enum emulation_result er = EMULATE_DONE; - - if (kvm_read_c0_guest_status(cop0) & ST0_EXL) { - kvm_debug("[%#lx] ERET to %#lx\n", vcpu->arch.pc, - kvm_read_c0_guest_epc(cop0)); - kvm_clear_c0_guest_status(cop0, ST0_EXL); - vcpu->arch.pc = kvm_read_c0_guest_epc(cop0); - - } else if (kvm_read_c0_guest_status(cop0) & ST0_ERL) { - kvm_clear_c0_guest_status(cop0, ST0_ERL); - vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); - } else { - kvm_err("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", - vcpu->arch.pc); - er = EMULATE_FAIL; - } - - return er; -} - -enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) -{ - kvm_debug("[%#lx] !!!WAIT!!! (%#lx)\n", vcpu->arch.pc, - vcpu->arch.pending_exceptions); - - ++vcpu->stat.wait_exits; - trace_kvm_exit(vcpu, WAIT_EXITS); - if (!vcpu->arch.pending_exceptions) { - vcpu->arch.wait = 1; - kvm_vcpu_block(vcpu); - - /* - * We we are runnable, then definitely go off to user space to - * check if any I/O interrupts are pending. - */ - if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) { - clear_bit(KVM_REQ_UNHALT, &vcpu->requests); - vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; - } - } - - return EMULATE_DONE; -} - -/* - * XXXKYMA: Linux doesn't seem to use TLBR, return EMULATE_FAIL for now so that - * we can catch this, if things ever change - */ -enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - uint32_t pc = vcpu->arch.pc; - - kvm_err("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); - return EMULATE_FAIL; -} - -/* Write Guest TLB Entry @ Index */ -enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - int index = kvm_read_c0_guest_index(cop0); - struct kvm_mips_tlb *tlb = NULL; - uint32_t pc = vcpu->arch.pc; - - if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { - kvm_debug("%s: illegal index: %d\n", __func__, index); - kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), - kvm_read_c0_guest_entrylo1(cop0), - kvm_read_c0_guest_pagemask(cop0)); - index = (index & ~0x80000000) % KVM_MIPS_GUEST_TLB_SIZE; - } - - tlb = &vcpu->arch.guest_tlb[index]; - /* - * Probe the shadow host TLB for the entry being overwritten, if one - * matches, invalidate it - */ - kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); - - tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); - tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); - tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); - tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); - - kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), - kvm_read_c0_guest_entrylo1(cop0), - kvm_read_c0_guest_pagemask(cop0)); - - return EMULATE_DONE; -} - -/* Write Guest TLB Entry @ Random Index */ -enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_mips_tlb *tlb = NULL; - uint32_t pc = vcpu->arch.pc; - int index; - - get_random_bytes(&index, sizeof(index)); - index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); - - if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { - kvm_err("%s: illegal index: %d\n", __func__, index); - return EMULATE_FAIL; - } - - tlb = &vcpu->arch.guest_tlb[index]; - - /* - * Probe the shadow host TLB for the entry being overwritten, if one - * matches, invalidate it - */ - kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); - - tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); - tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); - tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); - tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); - - kvm_debug("[%#x] COP0_TLBWR[%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx)\n", - pc, index, kvm_read_c0_guest_entryhi(cop0), - kvm_read_c0_guest_entrylo0(cop0), - kvm_read_c0_guest_entrylo1(cop0)); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - long entryhi = kvm_read_c0_guest_entryhi(cop0); - uint32_t pc = vcpu->arch.pc; - int index = -1; - - index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); - - kvm_write_c0_guest_index(cop0, index); - - kvm_debug("[%#x] COP0_TLBP (entryhi: %#lx), index: %d\n", pc, entryhi, - index); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, - uint32_t cause, struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - enum emulation_result er = EMULATE_DONE; - int32_t rt, rd, copz, sel, co_bit, op; - uint32_t pc = vcpu->arch.pc; - unsigned long curr_pc; - - /* - * Update PC and hold onto current PC in case there is - * an error and we want to rollback the PC - */ - curr_pc = vcpu->arch.pc; - er = update_pc(vcpu, cause); - if (er == EMULATE_FAIL) - return er; - - copz = (inst >> 21) & 0x1f; - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; - co_bit = (inst >> 25) & 1; - - if (co_bit) { - op = (inst) & 0xff; - - switch (op) { - case tlbr_op: /* Read indexed TLB entry */ - er = kvm_mips_emul_tlbr(vcpu); - break; - case tlbwi_op: /* Write indexed */ - er = kvm_mips_emul_tlbwi(vcpu); - break; - case tlbwr_op: /* Write random */ - er = kvm_mips_emul_tlbwr(vcpu); - break; - case tlbp_op: /* TLB Probe */ - er = kvm_mips_emul_tlbp(vcpu); - break; - case rfe_op: - kvm_err("!!!COP0_RFE!!!\n"); - break; - case eret_op: - er = kvm_mips_emul_eret(vcpu); - goto dont_update_pc; - break; - case wait_op: - er = kvm_mips_emul_wait(vcpu); - break; - } - } else { - switch (copz) { - case mfc_op: -#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS - cop0->stat[rd][sel]++; -#endif - /* Get reg */ - if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { - vcpu->arch.gprs[rt] = kvm_mips_read_count(vcpu); - } else if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { - vcpu->arch.gprs[rt] = 0x0; -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - kvm_mips_trans_mfc0(inst, opc, vcpu); -#endif - } else { - vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; - -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - kvm_mips_trans_mfc0(inst, opc, vcpu); -#endif - } - - kvm_debug - ("[%#x] MFCz[%d][%d], vcpu->arch.gprs[%d]: %#lx\n", - pc, rd, sel, rt, vcpu->arch.gprs[rt]); - - break; - - case dmfc_op: - vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; - break; - - case mtc_op: -#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS - cop0->stat[rd][sel]++; -#endif - if ((rd == MIPS_CP0_TLB_INDEX) - && (vcpu->arch.gprs[rt] >= - KVM_MIPS_GUEST_TLB_SIZE)) { - kvm_err("Invalid TLB Index: %ld", - vcpu->arch.gprs[rt]); - er = EMULATE_FAIL; - break; - } -#define C0_EBASE_CORE_MASK 0xff - if ((rd == MIPS_CP0_PRID) && (sel == 1)) { - /* Preserve CORE number */ - kvm_change_c0_guest_ebase(cop0, - ~(C0_EBASE_CORE_MASK), - vcpu->arch.gprs[rt]); - kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n", - kvm_read_c0_guest_ebase(cop0)); - } else if (rd == MIPS_CP0_TLB_HI && sel == 0) { - uint32_t nasid = - vcpu->arch.gprs[rt] & ASID_MASK; - if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) && - ((kvm_read_c0_guest_entryhi(cop0) & - ASID_MASK) != nasid)) { - kvm_debug("MTCz, change ASID from %#lx to %#lx\n", - kvm_read_c0_guest_entryhi(cop0) - & ASID_MASK, - vcpu->arch.gprs[rt] - & ASID_MASK); - - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - } - kvm_write_c0_guest_entryhi(cop0, - vcpu->arch.gprs[rt]); - } - /* Are we writing to COUNT */ - else if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { - kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]); - goto done; - } else if ((rd == MIPS_CP0_COMPARE) && (sel == 0)) { - kvm_debug("[%#x] MTCz, COMPARE %#lx <- %#lx\n", - pc, kvm_read_c0_guest_compare(cop0), - vcpu->arch.gprs[rt]); - - /* If we are writing to COMPARE */ - /* Clear pending timer interrupt, if any */ - kvm_mips_callbacks->dequeue_timer_int(vcpu); - kvm_mips_write_compare(vcpu, - vcpu->arch.gprs[rt]); - } else if ((rd == MIPS_CP0_STATUS) && (sel == 0)) { - kvm_write_c0_guest_status(cop0, - vcpu->arch.gprs[rt]); - /* - * Make sure that CU1 and NMI bits are - * never set - */ - kvm_clear_c0_guest_status(cop0, - (ST0_CU1 | ST0_NMI)); - -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - kvm_mips_trans_mtc0(inst, opc, vcpu); -#endif - } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) { - uint32_t old_cause, new_cause; - - old_cause = kvm_read_c0_guest_cause(cop0); - new_cause = vcpu->arch.gprs[rt]; - /* Update R/W bits */ - kvm_change_c0_guest_cause(cop0, 0x08800300, - new_cause); - /* DC bit enabling/disabling timer? */ - if ((old_cause ^ new_cause) & CAUSEF_DC) { - if (new_cause & CAUSEF_DC) - kvm_mips_count_disable_cause(vcpu); - else - kvm_mips_count_enable_cause(vcpu); - } - } else { - cop0->reg[rd][sel] = vcpu->arch.gprs[rt]; -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - kvm_mips_trans_mtc0(inst, opc, vcpu); -#endif - } - - kvm_debug("[%#x] MTCz, cop0->reg[%d][%d]: %#lx\n", pc, - rd, sel, cop0->reg[rd][sel]); - break; - - case dmtc_op: - kvm_err("!!!!!!![%#lx]dmtc_op: rt: %d, rd: %d, sel: %d!!!!!!\n", - vcpu->arch.pc, rt, rd, sel); - er = EMULATE_FAIL; - break; - - case mfmcz_op: -#ifdef KVM_MIPS_DEBUG_COP0_COUNTERS - cop0->stat[MIPS_CP0_STATUS][0]++; -#endif - if (rt != 0) { - vcpu->arch.gprs[rt] = - kvm_read_c0_guest_status(cop0); - } - /* EI */ - if (inst & 0x20) { - kvm_debug("[%#lx] mfmcz_op: EI\n", - vcpu->arch.pc); - kvm_set_c0_guest_status(cop0, ST0_IE); - } else { - kvm_debug("[%#lx] mfmcz_op: DI\n", - vcpu->arch.pc); - kvm_clear_c0_guest_status(cop0, ST0_IE); - } - - break; - - case wrpgpr_op: - { - uint32_t css = - cop0->reg[MIPS_CP0_STATUS][2] & 0xf; - uint32_t pss = - (cop0->reg[MIPS_CP0_STATUS][2] >> 6) & 0xf; - /* - * We don't support any shadow register sets, so - * SRSCtl[PSS] == SRSCtl[CSS] = 0 - */ - if (css || pss) { - er = EMULATE_FAIL; - break; - } - kvm_debug("WRPGPR[%d][%d] = %#lx\n", pss, rd, - vcpu->arch.gprs[rt]); - vcpu->arch.gprs[rd] = vcpu->arch.gprs[rt]; - } - break; - default: - kvm_err("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", - vcpu->arch.pc, copz); - er = EMULATE_FAIL; - break; - } - } - -done: - /* Rollback PC only if emulation was unsuccessful */ - if (er == EMULATE_FAIL) - vcpu->arch.pc = curr_pc; - -dont_update_pc: - /* - * This is for special instructions whose emulation - * updates the PC, so do not overwrite the PC under - * any circumstances - */ - - return er; -} - -enum emulation_result kvm_mips_emulate_store(uint32_t inst, uint32_t cause, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DO_MMIO; - int32_t op, base, rt, offset; - uint32_t bytes; - void *data = run->mmio.data; - unsigned long curr_pc; - - /* - * Update PC and hold onto current PC in case there is - * an error and we want to rollback the PC - */ - curr_pc = vcpu->arch.pc; - er = update_pc(vcpu, cause); - if (er == EMULATE_FAIL) - return er; - - rt = (inst >> 16) & 0x1f; - base = (inst >> 21) & 0x1f; - offset = inst & 0xffff; - op = (inst >> 26) & 0x3f; - - switch (op) { - case sb_op: - bytes = 1; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - run->mmio.len = bytes; - run->mmio.is_write = 1; - vcpu->mmio_needed = 1; - vcpu->mmio_is_write = 1; - *(u8 *) data = vcpu->arch.gprs[rt]; - kvm_debug("OP_SB: eaddr: %#lx, gpr: %#lx, data: %#x\n", - vcpu->arch.host_cp0_badvaddr, vcpu->arch.gprs[rt], - *(uint8_t *) data); - - break; - - case sw_op: - bytes = 4; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - - run->mmio.len = bytes; - run->mmio.is_write = 1; - vcpu->mmio_needed = 1; - vcpu->mmio_is_write = 1; - *(uint32_t *) data = vcpu->arch.gprs[rt]; - - kvm_debug("[%#lx] OP_SW: eaddr: %#lx, gpr: %#lx, data: %#x\n", - vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, - vcpu->arch.gprs[rt], *(uint32_t *) data); - break; - - case sh_op: - bytes = 2; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - - run->mmio.len = bytes; - run->mmio.is_write = 1; - vcpu->mmio_needed = 1; - vcpu->mmio_is_write = 1; - *(uint16_t *) data = vcpu->arch.gprs[rt]; - - kvm_debug("[%#lx] OP_SH: eaddr: %#lx, gpr: %#lx, data: %#x\n", - vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, - vcpu->arch.gprs[rt], *(uint32_t *) data); - break; - - default: - kvm_err("Store not yet supported"); - er = EMULATE_FAIL; - break; - } - - /* Rollback PC if emulation was unsuccessful */ - if (er == EMULATE_FAIL) - vcpu->arch.pc = curr_pc; - - return er; -} - -enum emulation_result kvm_mips_emulate_load(uint32_t inst, uint32_t cause, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DO_MMIO; - int32_t op, base, rt, offset; - uint32_t bytes; - - rt = (inst >> 16) & 0x1f; - base = (inst >> 21) & 0x1f; - offset = inst & 0xffff; - op = (inst >> 26) & 0x3f; - - vcpu->arch.pending_load_cause = cause; - vcpu->arch.io_gpr = rt; - - switch (op) { - case lw_op: - bytes = 4; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - er = EMULATE_FAIL; - break; - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - - run->mmio.len = bytes; - run->mmio.is_write = 0; - vcpu->mmio_needed = 1; - vcpu->mmio_is_write = 0; - break; - - case lh_op: - case lhu_op: - bytes = 2; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - er = EMULATE_FAIL; - break; - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - - run->mmio.len = bytes; - run->mmio.is_write = 0; - vcpu->mmio_needed = 1; - vcpu->mmio_is_write = 0; - - if (op == lh_op) - vcpu->mmio_needed = 2; - else - vcpu->mmio_needed = 1; - - break; - - case lbu_op: - case lb_op: - bytes = 1; - if (bytes > sizeof(run->mmio.data)) { - kvm_err("%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - er = EMULATE_FAIL; - break; - } - run->mmio.phys_addr = - kvm_mips_callbacks->gva_to_gpa(vcpu->arch. - host_cp0_badvaddr); - if (run->mmio.phys_addr == KVM_INVALID_ADDR) { - er = EMULATE_FAIL; - break; - } - - run->mmio.len = bytes; - run->mmio.is_write = 0; - vcpu->mmio_is_write = 0; - - if (op == lb_op) - vcpu->mmio_needed = 2; - else - vcpu->mmio_needed = 1; - - break; - - default: - kvm_err("Load not yet supported"); - er = EMULATE_FAIL; - break; - } - - return er; -} - -int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) -{ - unsigned long offset = (va & ~PAGE_MASK); - struct kvm *kvm = vcpu->kvm; - unsigned long pa; - gfn_t gfn; - pfn_t pfn; - - gfn = va >> PAGE_SHIFT; - - if (gfn >= kvm->arch.guest_pmap_npages) { - kvm_err("%s: Invalid gfn: %#llx\n", __func__, gfn); - kvm_mips_dump_host_tlbs(); - kvm_arch_vcpu_dump_regs(vcpu); - return -1; - } - pfn = kvm->arch.guest_pmap[gfn]; - pa = (pfn << PAGE_SHIFT) | offset; - - kvm_debug("%s: va: %#lx, unmapped: %#x\n", __func__, va, - CKSEG0ADDR(pa)); - - local_flush_icache_range(CKSEG0ADDR(pa), 32); - return 0; -} - -#define MIPS_CACHE_OP_INDEX_INV 0x0 -#define MIPS_CACHE_OP_INDEX_LD_TAG 0x1 -#define MIPS_CACHE_OP_INDEX_ST_TAG 0x2 -#define MIPS_CACHE_OP_IMP 0x3 -#define MIPS_CACHE_OP_HIT_INV 0x4 -#define MIPS_CACHE_OP_FILL_WB_INV 0x5 -#define MIPS_CACHE_OP_HIT_HB 0x6 -#define MIPS_CACHE_OP_FETCH_LOCK 0x7 - -#define MIPS_CACHE_ICACHE 0x0 -#define MIPS_CACHE_DCACHE 0x1 -#define MIPS_CACHE_SEC 0x3 - -enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, - uint32_t cause, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - enum emulation_result er = EMULATE_DONE; - int32_t offset, cache, op_inst, op, base; - struct kvm_vcpu_arch *arch = &vcpu->arch; - unsigned long va; - unsigned long curr_pc; - - /* - * Update PC and hold onto current PC in case there is - * an error and we want to rollback the PC - */ - curr_pc = vcpu->arch.pc; - er = update_pc(vcpu, cause); - if (er == EMULATE_FAIL) - return er; - - base = (inst >> 21) & 0x1f; - op_inst = (inst >> 16) & 0x1f; - offset = inst & 0xffff; - cache = (inst >> 16) & 0x3; - op = (inst >> 18) & 0x7; - - va = arch->gprs[base] + offset; - - kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - cache, op, base, arch->gprs[base], offset); - - /* - * Treat INDEX_INV as a nop, basically issued by Linux on startup to - * invalidate the caches entirely by stepping through all the - * ways/indexes - */ - if (op == MIPS_CACHE_OP_INDEX_INV) { - kvm_debug("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - vcpu->arch.pc, vcpu->arch.gprs[31], cache, op, base, - arch->gprs[base], offset); - - if (cache == MIPS_CACHE_DCACHE) - r4k_blast_dcache(); - else if (cache == MIPS_CACHE_ICACHE) - r4k_blast_icache(); - else { - kvm_err("%s: unsupported CACHE INDEX operation\n", - __func__); - return EMULATE_FAIL; - } - -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - kvm_mips_trans_cache_index(inst, opc, vcpu); -#endif - goto done; - } - - preempt_disable(); - if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) { - if (kvm_mips_host_tlb_lookup(vcpu, va) < 0) - kvm_mips_handle_kseg0_tlb_fault(va, vcpu); - } else if ((KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0) || - KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) { - int index; - - /* If an entry already exists then skip */ - if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0) - goto skip_fault; - - /* - * If address not in the guest TLB, then give the guest a fault, - * the resulting handler will do the right thing - */ - index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) | - (kvm_read_c0_guest_entryhi - (cop0) & ASID_MASK)); - - if (index < 0) { - vcpu->arch.host_cp0_entryhi = (va & VPN2_MASK); - vcpu->arch.host_cp0_badvaddr = va; - er = kvm_mips_emulate_tlbmiss_ld(cause, NULL, run, - vcpu); - preempt_enable(); - goto dont_update_pc; - } else { - struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; - /* - * Check if the entry is valid, if not then setup a TLB - * invalid exception to the guest - */ - if (!TLB_IS_VALID(*tlb, va)) { - er = kvm_mips_emulate_tlbinv_ld(cause, NULL, - run, vcpu); - preempt_enable(); - goto dont_update_pc; - } else { - /* - * We fault an entry from the guest tlb to the - * shadow host TLB - */ - kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, - NULL, - NULL); - } - } - } else { - kvm_err("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - cache, op, base, arch->gprs[base], offset); - er = EMULATE_FAIL; - preempt_enable(); - goto dont_update_pc; - - } - -skip_fault: - /* XXXKYMA: Only a subset of cache ops are supported, used by Linux */ - if (cache == MIPS_CACHE_DCACHE - && (op == MIPS_CACHE_OP_FILL_WB_INV - || op == MIPS_CACHE_OP_HIT_INV)) { - flush_dcache_line(va); - -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - /* - * Replace the CACHE instruction, with a SYNCI, not the same, - * but avoids a trap - */ - kvm_mips_trans_cache_va(inst, opc, vcpu); -#endif - } else if (op == MIPS_CACHE_OP_HIT_INV && cache == MIPS_CACHE_ICACHE) { - flush_dcache_line(va); - flush_icache_line(va); - -#ifdef CONFIG_KVM_MIPS_DYN_TRANS - /* Replace the CACHE instruction, with a SYNCI */ - kvm_mips_trans_cache_va(inst, opc, vcpu); -#endif - } else { - kvm_err("NO-OP CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", - cache, op, base, arch->gprs[base], offset); - er = EMULATE_FAIL; - preempt_enable(); - goto dont_update_pc; - } - - preempt_enable(); - -dont_update_pc: - /* Rollback PC */ - vcpu->arch.pc = curr_pc; -done: - return er; -} - -enum emulation_result kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DONE; - uint32_t inst; - - /* Fetch the instruction. */ - if (cause & CAUSEF_BD) - opc += 1; - - inst = kvm_get_inst(opc, vcpu); - - switch (((union mips_instruction)inst).r_format.opcode) { - case cop0_op: - er = kvm_mips_emulate_CP0(inst, opc, cause, run, vcpu); - break; - case sb_op: - case sh_op: - case sw_op: - er = kvm_mips_emulate_store(inst, cause, run, vcpu); - break; - case lb_op: - case lbu_op: - case lhu_op: - case lh_op: - case lw_op: - er = kvm_mips_emulate_load(inst, cause, run, vcpu); - break; - - case cache_op: - ++vcpu->stat.cache_exits; - trace_kvm_exit(vcpu, CACHE_EXITS); - er = kvm_mips_emulate_cache(inst, opc, cause, run, vcpu); - break; - - default: - kvm_err("Instruction emulation not supported (%p/%#x)\n", opc, - inst); - kvm_arch_vcpu_dump_regs(vcpu); - er = EMULATE_FAIL; - break; - } - - return er; -} - -enum emulation_result kvm_mips_emulate_syscall(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("Delivering SYSCALL @ pc %#lx\n", arch->pc); - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_SYSCALL << CAUSEB_EXCCODE)); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - } else { - kvm_err("Trying to deliver SYSCALL when EXL is already set\n"); - er = EMULATE_FAIL; - } - - return er; -} - -enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - unsigned long entryhi = (vcpu->arch. host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("[EXL == 0] delivering TLB MISS @ pc %#lx\n", - arch->pc); - - /* set pc to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x0; - - } else { - kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", - arch->pc); - - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_TLB_LD_MISS << CAUSEB_EXCCODE)); - - /* setup badvaddr, context and entryhi registers for the guest */ - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - /* XXXKYMA: is the context register used by linux??? */ - kvm_write_c0_guest_entryhi(cop0, entryhi); - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - unsigned long entryhi = - (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n", - arch->pc); - - /* set pc to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - } else { - kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", - arch->pc); - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_TLB_LD_MISS << CAUSEB_EXCCODE)); - - /* setup badvaddr, context and entryhi registers for the guest */ - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - /* XXXKYMA: is the context register used by linux??? */ - kvm_write_c0_guest_entryhi(cop0, entryhi); - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", - arch->pc); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x0; - } else { - kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", - arch->pc); - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_TLB_ST_MISS << CAUSEB_EXCCODE)); - - /* setup badvaddr, context and entryhi registers for the guest */ - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - /* XXXKYMA: is the context register used by linux??? */ - kvm_write_c0_guest_entryhi(cop0, entryhi); - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", - arch->pc); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } else { - kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", - arch->pc); - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_TLB_ST_MISS << CAUSEB_EXCCODE)); - - /* setup badvaddr, context and entryhi registers for the guest */ - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - /* XXXKYMA: is the context register used by linux??? */ - kvm_write_c0_guest_entryhi(cop0, entryhi); - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - - return EMULATE_DONE; -} - -/* TLBMOD: store into address matching TLB with Dirty bit off */ -enum emulation_result kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DONE; -#ifdef DEBUG - struct mips_coproc *cop0 = vcpu->arch.cop0; - unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - int index; - - /* If address not in the guest TLB, then we are in trouble */ - index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); - if (index < 0) { - /* XXXKYMA Invalidate and retry */ - kvm_mips_host_tlb_inv(vcpu, vcpu->arch.host_cp0_badvaddr); - kvm_err("%s: host got TLBMOD for %#lx but entry not present in Guest TLB\n", - __func__, entryhi); - kvm_mips_dump_guest_tlbs(vcpu); - kvm_mips_dump_host_tlbs(); - return EMULATE_FAIL; - } -#endif - - er = kvm_mips_emulate_tlbmod(cause, opc, run, vcpu); - return er; -} - -enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | - (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); - struct kvm_vcpu_arch *arch = &vcpu->arch; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n", - arch->pc); - - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } else { - kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n", - arch->pc); - arch->pc = KVM_GUEST_KSEG0 + 0x180; - } - - kvm_change_c0_guest_cause(cop0, (0xff), (T_TLB_MOD << CAUSEB_EXCCODE)); - - /* setup badvaddr, context and entryhi registers for the guest */ - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - /* XXXKYMA: is the context register used by linux??? */ - kvm_write_c0_guest_entryhi(cop0, entryhi); - /* Blow away the shadow host TLBs */ - kvm_mips_flush_host_tlb(1); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - } - - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_COP_UNUSABLE << CAUSEB_EXCCODE)); - kvm_change_c0_guest_cause(cop0, (CAUSEF_CE), (0x1 << CAUSEB_CE)); - - return EMULATE_DONE; -} - -enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("Delivering RI @ pc %#lx\n", arch->pc); - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_RES_INST << CAUSEB_EXCCODE)); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - } else { - kvm_err("Trying to deliver RI when EXL is already set\n"); - er = EMULATE_FAIL; - } - - return er; -} - -enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("Delivering BP @ pc %#lx\n", arch->pc); - - kvm_change_c0_guest_cause(cop0, (0xff), - (T_BREAK << CAUSEB_EXCCODE)); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - } else { - kvm_err("Trying to deliver BP when EXL is already set\n"); - er = EMULATE_FAIL; - } - - return er; -} - -/* ll/sc, rdhwr, sync emulation */ - -#define OPCODE 0xfc000000 -#define BASE 0x03e00000 -#define RT 0x001f0000 -#define OFFSET 0x0000ffff -#define LL 0xc0000000 -#define SC 0xe0000000 -#define SPEC0 0x00000000 -#define SPEC3 0x7c000000 -#define RD 0x0000f800 -#define FUNC 0x0000003f -#define SYNC 0x0000000f -#define RDHWR 0x0000003b - -enum emulation_result kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; - unsigned long curr_pc; - uint32_t inst; - - /* - * Update PC and hold onto current PC in case there is - * an error and we want to rollback the PC - */ - curr_pc = vcpu->arch.pc; - er = update_pc(vcpu, cause); - if (er == EMULATE_FAIL) - return er; - - /* Fetch the instruction. */ - if (cause & CAUSEF_BD) - opc += 1; - - inst = kvm_get_inst(opc, vcpu); - - if (inst == KVM_INVALID_INST) { - kvm_err("%s: Cannot get inst @ %p\n", __func__, opc); - return EMULATE_FAIL; - } - - if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) { - int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); - int rd = (inst & RD) >> 11; - int rt = (inst & RT) >> 16; - /* If usermode, check RDHWR rd is allowed by guest HWREna */ - if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) { - kvm_debug("RDHWR %#x disallowed by HWREna @ %p\n", - rd, opc); - goto emulate_ri; - } - switch (rd) { - case 0: /* CPU number */ - arch->gprs[rt] = 0; - break; - case 1: /* SYNCI length */ - arch->gprs[rt] = min(current_cpu_data.dcache.linesz, - current_cpu_data.icache.linesz); - break; - case 2: /* Read count register */ - arch->gprs[rt] = kvm_mips_read_count(vcpu); - break; - case 3: /* Count register resolution */ - switch (current_cpu_data.cputype) { - case CPU_20KC: - case CPU_25KF: - arch->gprs[rt] = 1; - break; - default: - arch->gprs[rt] = 2; - } - break; - case 29: - arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0); - break; - - default: - kvm_debug("RDHWR %#x not supported @ %p\n", rd, opc); - goto emulate_ri; - } - } else { - kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst); - goto emulate_ri; - } - - return EMULATE_DONE; - -emulate_ri: - /* - * Rollback PC (if in branch delay slot then the PC already points to - * branch target), and pass the RI exception to the guest OS. - */ - vcpu->arch.pc = curr_pc; - return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); -} - -enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, - struct kvm_run *run) -{ - unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; - enum emulation_result er = EMULATE_DONE; - unsigned long curr_pc; - - if (run->mmio.len > sizeof(*gpr)) { - kvm_err("Bad MMIO length: %d", run->mmio.len); - er = EMULATE_FAIL; - goto done; - } - - /* - * Update PC and hold onto current PC in case there is - * an error and we want to rollback the PC - */ - curr_pc = vcpu->arch.pc; - er = update_pc(vcpu, vcpu->arch.pending_load_cause); - if (er == EMULATE_FAIL) - return er; - - switch (run->mmio.len) { - case 4: - *gpr = *(int32_t *) run->mmio.data; - break; - - case 2: - if (vcpu->mmio_needed == 2) - *gpr = *(int16_t *) run->mmio.data; - else - *gpr = *(int16_t *) run->mmio.data; - - break; - case 1: - if (vcpu->mmio_needed == 2) - *gpr = *(int8_t *) run->mmio.data; - else - *gpr = *(u8 *) run->mmio.data; - break; - } - - if (vcpu->arch.pending_load_cause & CAUSEF_BD) - kvm_debug("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", - vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, - vcpu->mmio_needed); - -done: - return er; -} - -static enum emulation_result kvm_mips_emulate_exc(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_vcpu_arch *arch = &vcpu->arch; - enum emulation_result er = EMULATE_DONE; - - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_change_c0_guest_cause(cop0, (0xff), - (exccode << CAUSEB_EXCCODE)); - - /* Set PC to the exception entry point */ - arch->pc = KVM_GUEST_KSEG0 + 0x180; - kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); - - kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n", - exccode, kvm_read_c0_guest_epc(cop0), - kvm_read_c0_guest_badvaddr(cop0)); - } else { - kvm_err("Trying to deliver EXC when EXL is already set\n"); - er = EMULATE_FAIL; - } - - return er; -} - -enum emulation_result kvm_mips_check_privilege(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DONE; - uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - - int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); - - if (usermode) { - switch (exccode) { - case T_INT: - case T_SYSCALL: - case T_BREAK: - case T_RES_INST: - break; - - case T_COP_UNUSABLE: - if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 0) - er = EMULATE_PRIV_FAIL; - break; - - case T_TLB_MOD: - break; - - case T_TLB_LD_MISS: - /* - * We we are accessing Guest kernel space, then send an - * address error exception to the guest - */ - if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { - kvm_debug("%s: LD MISS @ %#lx\n", __func__, - badvaddr); - cause &= ~0xff; - cause |= (T_ADDR_ERR_LD << CAUSEB_EXCCODE); - er = EMULATE_PRIV_FAIL; - } - break; - - case T_TLB_ST_MISS: - /* - * We we are accessing Guest kernel space, then send an - * address error exception to the guest - */ - if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { - kvm_debug("%s: ST MISS @ %#lx\n", __func__, - badvaddr); - cause &= ~0xff; - cause |= (T_ADDR_ERR_ST << CAUSEB_EXCCODE); - er = EMULATE_PRIV_FAIL; - } - break; - - case T_ADDR_ERR_ST: - kvm_debug("%s: address error ST @ %#lx\n", __func__, - badvaddr); - if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { - cause &= ~0xff; - cause |= (T_TLB_ST_MISS << CAUSEB_EXCCODE); - } - er = EMULATE_PRIV_FAIL; - break; - case T_ADDR_ERR_LD: - kvm_debug("%s: address error LD @ %#lx\n", __func__, - badvaddr); - if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { - cause &= ~0xff; - cause |= (T_TLB_LD_MISS << CAUSEB_EXCCODE); - } - er = EMULATE_PRIV_FAIL; - break; - default: - er = EMULATE_PRIV_FAIL; - break; - } - } - - if (er == EMULATE_PRIV_FAIL) - kvm_mips_emulate_exc(cause, opc, run, vcpu); - - return er; -} - -/* - * User Address (UA) fault, this could happen if - * (1) TLB entry not present/valid in both Guest and shadow host TLBs, in this - * case we pass on the fault to the guest kernel and let it handle it. - * (2) TLB entry is present in the Guest TLB but not in the shadow, in this - * case we inject the TLB from the Guest TLB into the shadow host TLB - */ -enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, - uint32_t *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu) -{ - enum emulation_result er = EMULATE_DONE; - uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; - unsigned long va = vcpu->arch.host_cp0_badvaddr; - int index; - - kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx, entryhi: %#lx\n", - vcpu->arch.host_cp0_badvaddr, vcpu->arch.host_cp0_entryhi); - - /* - * KVM would not have got the exception if this entry was valid in the - * shadow host TLB. Check the Guest TLB, if the entry is not there then - * send the guest an exception. The guest exc handler should then inject - * an entry into the guest TLB. - */ - index = kvm_mips_guest_tlb_lookup(vcpu, - (va & VPN2_MASK) | - (kvm_read_c0_guest_entryhi - (vcpu->arch.cop0) & ASID_MASK)); - if (index < 0) { - if (exccode == T_TLB_LD_MISS) { - er = kvm_mips_emulate_tlbmiss_ld(cause, opc, run, vcpu); - } else if (exccode == T_TLB_ST_MISS) { - er = kvm_mips_emulate_tlbmiss_st(cause, opc, run, vcpu); - } else { - kvm_err("%s: invalid exc code: %d\n", __func__, - exccode); - er = EMULATE_FAIL; - } - } else { - struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; - - /* - * Check if the entry is valid, if not then setup a TLB invalid - * exception to the guest - */ - if (!TLB_IS_VALID(*tlb, va)) { - if (exccode == T_TLB_LD_MISS) { - er = kvm_mips_emulate_tlbinv_ld(cause, opc, run, - vcpu); - } else if (exccode == T_TLB_ST_MISS) { - er = kvm_mips_emulate_tlbinv_st(cause, opc, run, - vcpu); - } else { - kvm_err("%s: invalid exc code: %d\n", __func__, - exccode); - er = EMULATE_FAIL; - } - } else { - kvm_debug("Injecting hi: %#lx, lo0: %#lx, lo1: %#lx into shadow host TLB\n", - tlb->tlb_hi, tlb->tlb_lo0, tlb->tlb_lo1); - /* - * OK we have a Guest TLB entry, now inject it into the - * shadow host TLB - */ - kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, NULL, - NULL); - } - } - - return er; -} diff --git a/arch/mips/kvm/kvm_mips_int.c b/arch/mips/kvm/kvm_mips_int.c deleted file mode 100644 index d458c042d558..000000000000 --- a/arch/mips/kvm/kvm_mips_int.c +++ /dev/null @@ -1,242 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: Interrupt delivery - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "kvm_mips_int.h" - -void kvm_mips_queue_irq(struct kvm_vcpu *vcpu, uint32_t priority) -{ - set_bit(priority, &vcpu->arch.pending_exceptions); -} - -void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, uint32_t priority) -{ - clear_bit(priority, &vcpu->arch.pending_exceptions); -} - -void kvm_mips_queue_timer_int_cb(struct kvm_vcpu *vcpu) -{ - /* - * Cause bits to reflect the pending timer interrupt, - * the EXC code will be set when we are actually - * delivering the interrupt: - */ - kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ5 | C_TI)); - - /* Queue up an INT exception for the core */ - kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_TIMER); - -} - -void kvm_mips_dequeue_timer_int_cb(struct kvm_vcpu *vcpu) -{ - kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ5 | C_TI)); - kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER); -} - -void kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq) -{ - int intr = (int)irq->irq; - - /* - * Cause bits to reflect the pending IO interrupt, - * the EXC code will be set when we are actually - * delivering the interrupt: - */ - switch (intr) { - case 2: - kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ0)); - /* Queue up an INT exception for the core */ - kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IO); - break; - - case 3: - kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ1)); - kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IPI_1); - break; - - case 4: - kvm_set_c0_guest_cause(vcpu->arch.cop0, (C_IRQ2)); - kvm_mips_queue_irq(vcpu, MIPS_EXC_INT_IPI_2); - break; - - default: - break; - } - -} - -void kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq) -{ - int intr = (int)irq->irq; - - switch (intr) { - case -2: - kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ0)); - kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IO); - break; - - case -3: - kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ1)); - kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_1); - break; - - case -4: - kvm_clear_c0_guest_cause(vcpu->arch.cop0, (C_IRQ2)); - kvm_mips_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_2); - break; - - default: - break; - } - -} - -/* Deliver the interrupt of the corresponding priority, if possible. */ -int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause) -{ - int allowed = 0; - uint32_t exccode; - - struct kvm_vcpu_arch *arch = &vcpu->arch; - struct mips_coproc *cop0 = vcpu->arch.cop0; - - switch (priority) { - case MIPS_EXC_INT_TIMER: - if ((kvm_read_c0_guest_status(cop0) & ST0_IE) - && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) - && (kvm_read_c0_guest_status(cop0) & IE_IRQ5)) { - allowed = 1; - exccode = T_INT; - } - break; - - case MIPS_EXC_INT_IO: - if ((kvm_read_c0_guest_status(cop0) & ST0_IE) - && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) - && (kvm_read_c0_guest_status(cop0) & IE_IRQ0)) { - allowed = 1; - exccode = T_INT; - } - break; - - case MIPS_EXC_INT_IPI_1: - if ((kvm_read_c0_guest_status(cop0) & ST0_IE) - && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) - && (kvm_read_c0_guest_status(cop0) & IE_IRQ1)) { - allowed = 1; - exccode = T_INT; - } - break; - - case MIPS_EXC_INT_IPI_2: - if ((kvm_read_c0_guest_status(cop0) & ST0_IE) - && (!(kvm_read_c0_guest_status(cop0) & (ST0_EXL | ST0_ERL))) - && (kvm_read_c0_guest_status(cop0) & IE_IRQ2)) { - allowed = 1; - exccode = T_INT; - } - break; - - default: - break; - } - - /* Are we allowed to deliver the interrupt ??? */ - if (allowed) { - if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { - /* save old pc */ - kvm_write_c0_guest_epc(cop0, arch->pc); - kvm_set_c0_guest_status(cop0, ST0_EXL); - - if (cause & CAUSEF_BD) - kvm_set_c0_guest_cause(cop0, CAUSEF_BD); - else - kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); - - kvm_debug("Delivering INT @ pc %#lx\n", arch->pc); - - } else - kvm_err("Trying to deliver interrupt when EXL is already set\n"); - - kvm_change_c0_guest_cause(cop0, CAUSEF_EXCCODE, - (exccode << CAUSEB_EXCCODE)); - - /* XXXSL Set PC to the interrupt exception entry point */ - if (kvm_read_c0_guest_cause(cop0) & CAUSEF_IV) - arch->pc = KVM_GUEST_KSEG0 + 0x200; - else - arch->pc = KVM_GUEST_KSEG0 + 0x180; - - clear_bit(priority, &vcpu->arch.pending_exceptions); - } - - return allowed; -} - -int kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause) -{ - return 1; -} - -void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, uint32_t cause) -{ - unsigned long *pending = &vcpu->arch.pending_exceptions; - unsigned long *pending_clr = &vcpu->arch.pending_exceptions_clr; - unsigned int priority; - - if (!(*pending) && !(*pending_clr)) - return; - - priority = __ffs(*pending_clr); - while (priority <= MIPS_EXC_MAX) { - if (kvm_mips_callbacks->irq_clear(vcpu, priority, cause)) { - if (!KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE) - break; - } - - priority = find_next_bit(pending_clr, - BITS_PER_BYTE * sizeof(*pending_clr), - priority + 1); - } - - priority = __ffs(*pending); - while (priority <= MIPS_EXC_MAX) { - if (kvm_mips_callbacks->irq_deliver(vcpu, priority, cause)) { - if (!KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE) - break; - } - - priority = find_next_bit(pending, - BITS_PER_BYTE * sizeof(*pending), - priority + 1); - } - -} - -int kvm_mips_pending_timer(struct kvm_vcpu *vcpu) -{ - return test_bit(MIPS_EXC_INT_TIMER, &vcpu->arch.pending_exceptions); -} diff --git a/arch/mips/kvm/kvm_mips_int.h b/arch/mips/kvm/kvm_mips_int.h deleted file mode 100644 index 4ab4bdfad703..000000000000 --- a/arch/mips/kvm/kvm_mips_int.h +++ /dev/null @@ -1,53 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: Interrupts - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -/* - * MIPS Exception Priorities, exceptions (including interrupts) are queued up - * for the guest in the order specified by their priorities - */ - -#define MIPS_EXC_RESET 0 -#define MIPS_EXC_SRESET 1 -#define MIPS_EXC_DEBUG_ST 2 -#define MIPS_EXC_DEBUG 3 -#define MIPS_EXC_DDB 4 -#define MIPS_EXC_NMI 5 -#define MIPS_EXC_MCHK 6 -#define MIPS_EXC_INT_TIMER 7 -#define MIPS_EXC_INT_IO 8 -#define MIPS_EXC_EXECUTE 9 -#define MIPS_EXC_INT_IPI_1 10 -#define MIPS_EXC_INT_IPI_2 11 -#define MIPS_EXC_MAX 12 -/* XXXSL More to follow */ - -extern char mips32_exception[], mips32_exceptionEnd[]; -extern char mips32_GuestException[], mips32_GuestExceptionEnd[]; - -#define C_TI (_ULCAST_(1) << 30) - -#define KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE (0) -#define KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE (0) - -void kvm_mips_queue_irq(struct kvm_vcpu *vcpu, uint32_t priority); -void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, uint32_t priority); -int kvm_mips_pending_timer(struct kvm_vcpu *vcpu); - -void kvm_mips_queue_timer_int_cb(struct kvm_vcpu *vcpu); -void kvm_mips_dequeue_timer_int_cb(struct kvm_vcpu *vcpu); -void kvm_mips_queue_io_int_cb(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq); -void kvm_mips_dequeue_io_int_cb(struct kvm_vcpu *vcpu, - struct kvm_mips_interrupt *irq); -int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause); -int kvm_mips_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, - uint32_t cause); -void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, uint32_t cause); diff --git a/arch/mips/kvm/kvm_mips_opcode.h b/arch/mips/kvm/kvm_mips_opcode.h deleted file mode 100644 index 03a6ae84c7df..000000000000 --- a/arch/mips/kvm/kvm_mips_opcode.h +++ /dev/null @@ -1,22 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -/* Define opcode values not defined in */ - -#ifndef __KVM_MIPS_OPCODE_H__ -#define __KVM_MIPS_OPCODE_H__ - -/* COP0 Ops */ -#define mfmcz_op 0x0b /* 01011 */ -#define wrpgpr_op 0x0e /* 01110 */ - -/* COP0 opcodes (only if COP0 and CO=1): */ -#define wait_op 0x20 /* 100000 */ - -#endif /* __KVM_MIPS_OPCODE_H__ */ diff --git a/arch/mips/kvm/kvm_mips_stats.c b/arch/mips/kvm/kvm_mips_stats.c deleted file mode 100644 index a74d6024c5ad..000000000000 --- a/arch/mips/kvm/kvm_mips_stats.c +++ /dev/null @@ -1,80 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: COP0 access histogram - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include - -char *kvm_mips_exit_types_str[MAX_KVM_MIPS_EXIT_TYPES] = { - "WAIT", - "CACHE", - "Signal", - "Interrupt", - "COP0/1 Unusable", - "TLB Mod", - "TLB Miss (LD)", - "TLB Miss (ST)", - "Address Err (ST)", - "Address Error (LD)", - "System Call", - "Reserved Inst", - "Break Inst", - "D-Cache Flushes", -}; - -char *kvm_cop0_str[N_MIPS_COPROC_REGS] = { - "Index", - "Random", - "EntryLo0", - "EntryLo1", - "Context", - "PG Mask", - "Wired", - "HWREna", - "BadVAddr", - "Count", - "EntryHI", - "Compare", - "Status", - "Cause", - "EXC PC", - "PRID", - "Config", - "LLAddr", - "Watch Lo", - "Watch Hi", - "X Context", - "Reserved", - "Impl Dep", - "Debug", - "DEPC", - "PerfCnt", - "ErrCtl", - "CacheErr", - "TagLo", - "TagHi", - "ErrorEPC", - "DESAVE" -}; - -void kvm_mips_dump_stats(struct kvm_vcpu *vcpu) -{ -#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS - int i, j; - - kvm_info("\nKVM VCPU[%d] COP0 Access Profile:\n", vcpu->vcpu_id); - for (i = 0; i < N_MIPS_COPROC_REGS; i++) { - for (j = 0; j < N_MIPS_COPROC_SEL; j++) { - if (vcpu->arch.cop0->stat[i][j]) - kvm_info("%s[%d]: %lu\n", kvm_cop0_str[i], j, - vcpu->arch.cop0->stat[i][j]); - } - } -#endif -} diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c deleted file mode 100644 index bbcd82242059..000000000000 --- a/arch/mips/kvm/kvm_tlb.c +++ /dev/null @@ -1,809 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that - * TLB handlers run from KSEG0 - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#undef CONFIG_MIPS_MT -#include -#define CONFIG_MIPS_MT - -#define KVM_GUEST_PC_TLB 0 -#define KVM_GUEST_SP_TLB 1 - -#define PRIx64 "llx" - -atomic_t kvm_mips_instance; -EXPORT_SYMBOL(kvm_mips_instance); - -/* These function pointers are initialized once the KVM module is loaded */ -pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); -EXPORT_SYMBOL(kvm_mips_gfn_to_pfn); - -void (*kvm_mips_release_pfn_clean)(pfn_t pfn); -EXPORT_SYMBOL(kvm_mips_release_pfn_clean); - -bool (*kvm_mips_is_error_pfn)(pfn_t pfn); -EXPORT_SYMBOL(kvm_mips_is_error_pfn); - -uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK; -} - -uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK; -} - -inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) -{ - return vcpu->kvm->arch.commpage_tlb; -} - -/* Structure defining an tlb entry data set. */ - -void kvm_mips_dump_host_tlbs(void) -{ - unsigned long old_entryhi; - unsigned long old_pagemask; - struct kvm_mips_tlb tlb; - unsigned long flags; - int i; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - old_pagemask = read_c0_pagemask(); - - kvm_info("HOST TLBs:\n"); - kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); - - for (i = 0; i < current_cpu_data.tlbsize; i++) { - write_c0_index(i); - mtc0_tlbw_hazard(); - - tlb_read(); - tlbw_use_hazard(); - - tlb.tlb_hi = read_c0_entryhi(); - tlb.tlb_lo0 = read_c0_entrylo0(); - tlb.tlb_lo1 = read_c0_entrylo1(); - tlb.tlb_mask = read_c0_pagemask(); - - kvm_info("TLB%c%3d Hi 0x%08lx ", - (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', - i, tlb.tlb_hi); - kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), - (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo0 >> 3) & 7); - kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), - (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); - } - write_c0_entryhi(old_entryhi); - write_c0_pagemask(old_pagemask); - mtc0_tlbw_hazard(); - local_irq_restore(flags); -} -EXPORT_SYMBOL(kvm_mips_dump_host_tlbs); - -void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - struct kvm_mips_tlb tlb; - int i; - - kvm_info("Guest TLBs:\n"); - kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); - - for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { - tlb = vcpu->arch.guest_tlb[i]; - kvm_info("TLB%c%3d Hi 0x%08lx ", - (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', - i, tlb.tlb_hi); - kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), - (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo0 >> 3) & 7); - kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", - (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), - (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', - (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', - (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); - } -} -EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); - -static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) -{ - int srcu_idx, err = 0; - pfn_t pfn; - - if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE) - return 0; - - srcu_idx = srcu_read_lock(&kvm->srcu); - pfn = kvm_mips_gfn_to_pfn(kvm, gfn); - - if (kvm_mips_is_error_pfn(pfn)) { - kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn); - err = -EFAULT; - goto out; - } - - kvm->arch.guest_pmap[gfn] = pfn; -out: - srcu_read_unlock(&kvm->srcu, srcu_idx); - return err; -} - -/* Translate guest KSEG0 addresses to Host PA */ -unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, - unsigned long gva) -{ - gfn_t gfn; - uint32_t offset = gva & ~PAGE_MASK; - struct kvm *kvm = vcpu->kvm; - - if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) { - kvm_err("%s/%p: Invalid gva: %#lx\n", __func__, - __builtin_return_address(0), gva); - return KVM_INVALID_PAGE; - } - - gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT); - - if (gfn >= kvm->arch.guest_pmap_npages) { - kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn, - gva); - return KVM_INVALID_PAGE; - } - - if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) - return KVM_INVALID_ADDR; - - return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset; -} -EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa); - -/* XXXKYMA: Must be called with interrupts disabled */ -/* set flush_dcache_mask == 0 if no dcache flush required */ -int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, - unsigned long entrylo0, unsigned long entrylo1, - int flush_dcache_mask) -{ - unsigned long flags; - unsigned long old_entryhi; - int idx; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - write_c0_entryhi(entryhi); - mtc0_tlbw_hazard(); - - tlb_probe(); - tlb_probe_hazard(); - idx = read_c0_index(); - - if (idx > current_cpu_data.tlbsize) { - kvm_err("%s: Invalid Index: %d\n", __func__, idx); - kvm_mips_dump_host_tlbs(); - return -1; - } - - write_c0_entrylo0(entrylo0); - write_c0_entrylo1(entrylo1); - mtc0_tlbw_hazard(); - - if (idx < 0) - tlb_write_random(); - else - tlb_write_indexed(); - tlbw_use_hazard(); - - kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", - vcpu->arch.pc, idx, read_c0_entryhi(), - read_c0_entrylo0(), read_c0_entrylo1()); - - /* Flush D-cache */ - if (flush_dcache_mask) { - if (entrylo0 & MIPS3_PG_V) { - ++vcpu->stat.flush_dcache_exits; - flush_data_cache_page((entryhi & VPN2_MASK) & - ~flush_dcache_mask); - } - if (entrylo1 & MIPS3_PG_V) { - ++vcpu->stat.flush_dcache_exits; - flush_data_cache_page(((entryhi & VPN2_MASK) & - ~flush_dcache_mask) | - (0x1 << PAGE_SHIFT)); - } - } - - /* Restore old ASID */ - write_c0_entryhi(old_entryhi); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - local_irq_restore(flags); - return 0; -} - -/* XXXKYMA: Must be called with interrupts disabled */ -int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, - struct kvm_vcpu *vcpu) -{ - gfn_t gfn; - pfn_t pfn0, pfn1; - unsigned long vaddr = 0; - unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; - int even; - struct kvm *kvm = vcpu->kvm; - const int flush_dcache_mask = 0; - - if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) { - kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr); - kvm_mips_dump_host_tlbs(); - return -1; - } - - gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT); - if (gfn >= kvm->arch.guest_pmap_npages) { - kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__, - gfn, badvaddr); - kvm_mips_dump_host_tlbs(); - return -1; - } - even = !(gfn & 0x1); - vaddr = badvaddr & (PAGE_MASK << 1); - - if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) - return -1; - - if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0) - return -1; - - if (even) { - pfn0 = kvm->arch.guest_pmap[gfn]; - pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1]; - } else { - pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1]; - pfn1 = kvm->arch.guest_pmap[gfn]; - } - - entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu)); - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | - (1 << 2) | (0x1 << 1); - entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | - (1 << 2) | (0x1 << 1); - - return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, - flush_dcache_mask); -} -EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault); - -int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, - struct kvm_vcpu *vcpu) -{ - pfn_t pfn0, pfn1; - unsigned long flags, old_entryhi = 0, vaddr = 0; - unsigned long entrylo0 = 0, entrylo1 = 0; - - pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; - pfn1 = 0; - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | - (1 << 2) | (0x1 << 1); - entrylo1 = 0; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - vaddr = badvaddr & (PAGE_MASK << 1); - write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); - mtc0_tlbw_hazard(); - write_c0_entrylo0(entrylo0); - mtc0_tlbw_hazard(); - write_c0_entrylo1(entrylo1); - mtc0_tlbw_hazard(); - write_c0_index(kvm_mips_get_commpage_asid(vcpu)); - mtc0_tlbw_hazard(); - tlb_write_indexed(); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", - vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), - read_c0_entrylo0(), read_c0_entrylo1()); - - /* Restore old ASID */ - write_c0_entryhi(old_entryhi); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - local_irq_restore(flags); - - return 0; -} -EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault); - -int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, - struct kvm_mips_tlb *tlb, - unsigned long *hpa0, - unsigned long *hpa1) -{ - unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; - struct kvm *kvm = vcpu->kvm; - pfn_t pfn0, pfn1; - - if ((tlb->tlb_hi & VPN2_MASK) == 0) { - pfn0 = 0; - pfn1 = 0; - } else { - if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) - >> PAGE_SHIFT) < 0) - return -1; - - if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) - >> PAGE_SHIFT) < 0) - return -1; - - pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) - >> PAGE_SHIFT]; - pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) - >> PAGE_SHIFT]; - } - - if (hpa0) - *hpa0 = pfn0 << PAGE_SHIFT; - - if (hpa1) - *hpa1 = pfn1 << PAGE_SHIFT; - - /* Get attributes from the Guest TLB */ - entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ? - kvm_mips_get_kernel_asid(vcpu) : - kvm_mips_get_user_asid(vcpu)); - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | - (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); - entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | - (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); - - kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc, - tlb->tlb_lo0, tlb->tlb_lo1); - - return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, - tlb->tlb_mask); -} -EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault); - -int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) -{ - int i; - int index = -1; - struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; - - for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { - if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && - TLB_HI_ASID_HIT(tlb[i], entryhi)) { - index = i; - break; - } - } - - kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", - __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); - - return index; -} -EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); - -int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) -{ - unsigned long old_entryhi, flags; - int idx; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - - if (KVM_GUEST_KERNEL_MODE(vcpu)) - write_c0_entryhi((vaddr & VPN2_MASK) | - kvm_mips_get_kernel_asid(vcpu)); - else { - write_c0_entryhi((vaddr & VPN2_MASK) | - kvm_mips_get_user_asid(vcpu)); - } - - mtc0_tlbw_hazard(); - - tlb_probe(); - tlb_probe_hazard(); - idx = read_c0_index(); - - /* Restore old ASID */ - write_c0_entryhi(old_entryhi); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - local_irq_restore(flags); - - kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); - - return idx; -} -EXPORT_SYMBOL(kvm_mips_host_tlb_lookup); - -int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) -{ - int idx; - unsigned long flags, old_entryhi; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - - write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); - mtc0_tlbw_hazard(); - - tlb_probe(); - tlb_probe_hazard(); - idx = read_c0_index(); - - if (idx >= current_cpu_data.tlbsize) - BUG(); - - if (idx > 0) { - write_c0_entryhi(UNIQUE_ENTRYHI(idx)); - mtc0_tlbw_hazard(); - - write_c0_entrylo0(0); - mtc0_tlbw_hazard(); - - write_c0_entrylo1(0); - mtc0_tlbw_hazard(); - - tlb_write_indexed(); - mtc0_tlbw_hazard(); - } - - write_c0_entryhi(old_entryhi); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - local_irq_restore(flags); - - if (idx > 0) - kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, - (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); - - return 0; -} -EXPORT_SYMBOL(kvm_mips_host_tlb_inv); - -/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */ -int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index) -{ - unsigned long flags, old_entryhi; - - if (index >= current_cpu_data.tlbsize) - BUG(); - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - - write_c0_entryhi(UNIQUE_ENTRYHI(index)); - mtc0_tlbw_hazard(); - - write_c0_index(index); - mtc0_tlbw_hazard(); - - write_c0_entrylo0(0); - mtc0_tlbw_hazard(); - - write_c0_entrylo1(0); - mtc0_tlbw_hazard(); - - tlb_write_indexed(); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - write_c0_entryhi(old_entryhi); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - local_irq_restore(flags); - - return 0; -} - -void kvm_mips_flush_host_tlb(int skip_kseg0) -{ - unsigned long flags; - unsigned long old_entryhi, entryhi; - unsigned long old_pagemask; - int entry = 0; - int maxentry = current_cpu_data.tlbsize; - - local_irq_save(flags); - - old_entryhi = read_c0_entryhi(); - old_pagemask = read_c0_pagemask(); - - /* Blast 'em all away. */ - for (entry = 0; entry < maxentry; entry++) { - write_c0_index(entry); - mtc0_tlbw_hazard(); - - if (skip_kseg0) { - tlb_read(); - tlbw_use_hazard(); - - entryhi = read_c0_entryhi(); - - /* Don't blow away guest kernel entries */ - if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) - continue; - } - - /* Make sure all entries differ. */ - write_c0_entryhi(UNIQUE_ENTRYHI(entry)); - mtc0_tlbw_hazard(); - write_c0_entrylo0(0); - mtc0_tlbw_hazard(); - write_c0_entrylo1(0); - mtc0_tlbw_hazard(); - - tlb_write_indexed(); - mtc0_tlbw_hazard(); - } - - tlbw_use_hazard(); - - write_c0_entryhi(old_entryhi); - write_c0_pagemask(old_pagemask); - mtc0_tlbw_hazard(); - tlbw_use_hazard(); - - local_irq_restore(flags); -} -EXPORT_SYMBOL(kvm_mips_flush_host_tlb); - -void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, - struct kvm_vcpu *vcpu) -{ - unsigned long asid = asid_cache(cpu); - - asid += ASID_INC; - if (!(asid & ASID_MASK)) { - if (cpu_has_vtag_icache) - flush_icache_all(); - - kvm_local_flush_tlb_all(); /* start new asid cycle */ - - if (!asid) /* fix version if needed */ - asid = ASID_FIRST_VERSION; - } - - cpu_context(cpu, mm) = asid_cache(cpu) = asid; -} - -void kvm_local_flush_tlb_all(void) -{ - unsigned long flags; - unsigned long old_ctx; - int entry = 0; - - local_irq_save(flags); - /* Save old context and create impossible VPN2 value */ - old_ctx = read_c0_entryhi(); - write_c0_entrylo0(0); - write_c0_entrylo1(0); - - /* Blast 'em all away. */ - while (entry < current_cpu_data.tlbsize) { - /* Make sure all entries differ. */ - write_c0_entryhi(UNIQUE_ENTRYHI(entry)); - write_c0_index(entry); - mtc0_tlbw_hazard(); - tlb_write_indexed(); - entry++; - } - tlbw_use_hazard(); - write_c0_entryhi(old_ctx); - mtc0_tlbw_hazard(); - - local_irq_restore(flags); -} -EXPORT_SYMBOL(kvm_local_flush_tlb_all); - -/** - * kvm_mips_migrate_count() - Migrate timer. - * @vcpu: Virtual CPU. - * - * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it - * if it was running prior to being cancelled. - * - * Must be called when the VCPU is migrated to a different CPU to ensure that - * timer expiry during guest execution interrupts the guest and causes the - * interrupt to be delivered in a timely manner. - */ -static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) -{ - if (hrtimer_cancel(&vcpu->arch.comparecount_timer)) - hrtimer_restart(&vcpu->arch.comparecount_timer); -} - -/* Restore ASID once we are scheduled back after preemption */ -void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) -{ - unsigned long flags; - int newasid = 0; - - kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); - - /* Alocate new kernel and user ASIDs if needed */ - - local_irq_save(flags); - - if (((vcpu->arch. - guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) { - kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); - vcpu->arch.guest_kernel_asid[cpu] = - vcpu->arch.guest_kernel_mm.context.asid[cpu]; - kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); - vcpu->arch.guest_user_asid[cpu] = - vcpu->arch.guest_user_mm.context.asid[cpu]; - newasid++; - - kvm_debug("[%d]: cpu_context: %#lx\n", cpu, - cpu_context(cpu, current->mm)); - kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", - cpu, vcpu->arch.guest_kernel_asid[cpu]); - kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, - vcpu->arch.guest_user_asid[cpu]); - } - - if (vcpu->arch.last_sched_cpu != cpu) { - kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", - vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); - /* - * Migrate the timer interrupt to the current CPU so that it - * always interrupts the guest and synchronously triggers a - * guest timer interrupt. - */ - kvm_mips_migrate_count(vcpu); - } - - if (!newasid) { - /* - * If we preempted while the guest was executing, then reload - * the pre-empted ASID - */ - if (current->flags & PF_VCPU) { - write_c0_entryhi(vcpu->arch. - preempt_entryhi & ASID_MASK); - ehb(); - } - } else { - /* New ASIDs were allocated for the VM */ - - /* - * Were we in guest context? If so then the pre-empted ASID is - * no longer valid, we need to set it to what it should be based - * on the mode of the Guest (Kernel/User) - */ - if (current->flags & PF_VCPU) { - if (KVM_GUEST_KERNEL_MODE(vcpu)) - write_c0_entryhi(vcpu->arch. - guest_kernel_asid[cpu] & - ASID_MASK); - else - write_c0_entryhi(vcpu->arch. - guest_user_asid[cpu] & - ASID_MASK); - ehb(); - } - } - - local_irq_restore(flags); - -} -EXPORT_SYMBOL(kvm_arch_vcpu_load); - -/* ASID can change if another task is scheduled during preemption */ -void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) -{ - unsigned long flags; - uint32_t cpu; - - local_irq_save(flags); - - cpu = smp_processor_id(); - - vcpu->arch.preempt_entryhi = read_c0_entryhi(); - vcpu->arch.last_sched_cpu = cpu; - - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - ASID_VERSION_MASK)) { - kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, - cpu_context(cpu, current->mm)); - drop_mmu_context(current->mm, cpu); - } - write_c0_entryhi(cpu_asid(cpu, current->mm)); - ehb(); - - local_irq_restore(flags); -} -EXPORT_SYMBOL(kvm_arch_vcpu_put); - -uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - unsigned long paddr, flags, vpn2, asid; - uint32_t inst; - int index; - - if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 || - KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { - local_irq_save(flags); - index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc); - if (index >= 0) { - inst = *(opc); - } else { - vpn2 = (unsigned long) opc & VPN2_MASK; - asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK; - index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid); - if (index < 0) { - kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", - __func__, opc, vcpu, read_c0_entryhi()); - kvm_mips_dump_host_tlbs(); - local_irq_restore(flags); - return KVM_INVALID_INST; - } - kvm_mips_handle_mapped_seg_tlb_fault(vcpu, - &vcpu->arch. - guest_tlb[index], - NULL, NULL); - inst = *(opc); - } - local_irq_restore(flags); - } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { - paddr = - kvm_mips_translate_guest_kseg0_to_hpa(vcpu, - (unsigned long) opc); - inst = *(uint32_t *) CKSEG0ADDR(paddr); - } else { - kvm_err("%s: illegal address: %p\n", __func__, opc); - return KVM_INVALID_INST; - } - - return inst; -} -EXPORT_SYMBOL(kvm_get_inst); diff --git a/arch/mips/kvm/kvm_trap_emul.c b/arch/mips/kvm/kvm_trap_emul.c deleted file mode 100644 index bd2f6bc64d45..000000000000 --- a/arch/mips/kvm/kvm_trap_emul.c +++ /dev/null @@ -1,492 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * KVM/MIPS: Deliver/Emulate exceptions to the guest kernel - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Sanjay Lal - */ - -#include -#include -#include -#include - -#include - -#include "kvm_mips_opcode.h" -#include "kvm_mips_int.h" - -static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva) -{ - gpa_t gpa; - uint32_t kseg = KSEGX(gva); - - if ((kseg == CKSEG0) || (kseg == CKSEG1)) - gpa = CPHYSADDR(gva); - else { - kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva); - kvm_mips_dump_host_tlbs(); - gpa = KVM_INVALID_ADDR; - } - - kvm_debug("%s: gva %#lx, gpa: %#llx\n", __func__, gva, gpa); - - return gpa; -} - -static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) - er = kvm_mips_emulate_fpu_exc(cause, opc, run, vcpu); - else - er = kvm_mips_emulate_inst(cause, opc, run, vcpu); - - switch (er) { - case EMULATE_DONE: - ret = RESUME_GUEST; - break; - - case EMULATE_FAIL: - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - break; - - case EMULATE_WAIT: - run->exit_reason = KVM_EXIT_INTR; - ret = RESUME_HOST; - break; - - default: - BUG(); - } - return ret; -} - -static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 - || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { - kvm_debug("USER/KSEG23 ADDR TLB MOD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - er = kvm_mips_handle_tlbmod(cause, opc, run, vcpu); - - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { - /* - * XXXKYMA: The guest kernel does not expect to get this fault - * when we are not using HIGHMEM. Need to address this in a - * HIGHMEM kernel - */ - kvm_err("TLB MOD fault not handled, cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - kvm_mips_dump_host_tlbs(); - kvm_arch_vcpu_dump_regs(vcpu); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } else { - kvm_err("Illegal TLB Mod fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - kvm_mips_dump_host_tlbs(); - kvm_arch_vcpu_dump_regs(vcpu); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) - && KVM_GUEST_KERNEL_MODE(vcpu)) { - if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 - || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { - kvm_debug("USER ADDR TLB LD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { - /* - * All KSEG0 faults are handled by KVM, as the guest kernel does - * not expect to ever get them - */ - if (kvm_mips_handle_kseg0_tlb_fault - (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else { - kvm_err("Illegal TLB LD fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - kvm_mips_dump_host_tlbs(); - kvm_arch_vcpu_dump_regs(vcpu); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) - && KVM_GUEST_KERNEL_MODE(vcpu)) { - if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 - || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { - kvm_debug("USER ADDR TLB ST fault: PC: %#lx, BadVaddr: %#lx\n", - vcpu->arch.pc, badvaddr); - - /* - * User Address (UA) fault, this could happen if - * (1) TLB entry not present/valid in both Guest and shadow host - * TLBs, in this case we pass on the fault to the guest - * kernel and let it handle it. - * (2) TLB entry is present in the Guest TLB but not in the - * shadow, in this case we inject the TLB from the Guest TLB - * into the shadow host TLB - */ - - er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { - if (kvm_mips_handle_kseg0_tlb_fault - (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - } else { - kvm_err("Illegal TLB ST fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - kvm_mips_dump_host_tlbs(); - kvm_arch_vcpu_dump_regs(vcpu); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (KVM_GUEST_KERNEL_MODE(vcpu) - && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) { - kvm_debug("Emulate Store to MMIO space\n"); - er = kvm_mips_emulate_inst(cause, opc, run, vcpu); - if (er == EMULATE_FAIL) { - kvm_err("Emulate Store to MMIO space failed\n"); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } else { - run->exit_reason = KVM_EXIT_MMIO; - ret = RESUME_HOST; - } - } else { - kvm_err("Address Error (STORE): cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - if (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1) { - kvm_debug("Emulate Load from MMIO space @ %#lx\n", badvaddr); - er = kvm_mips_emulate_inst(cause, opc, run, vcpu); - if (er == EMULATE_FAIL) { - kvm_err("Emulate Load from MMIO space failed\n"); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } else { - run->exit_reason = KVM_EXIT_MMIO; - ret = RESUME_HOST; - } - } else { - kvm_err("Address Error (LOAD): cause %#lx, PC: %p, BadVaddr: %#lx\n", - cause, opc, badvaddr); - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - er = EMULATE_FAIL; - } - return ret; -} - -static int kvm_trap_emul_handle_syscall(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - er = kvm_mips_emulate_syscall(cause, opc, run, vcpu); - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_res_inst(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - er = kvm_mips_handle_ri(cause, opc, run, vcpu); - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_handle_break(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; - unsigned long cause = vcpu->arch.host_cp0_cause; - enum emulation_result er = EMULATE_DONE; - int ret = RESUME_GUEST; - - er = kvm_mips_emulate_bp_exc(cause, opc, run, vcpu); - if (er == EMULATE_DONE) - ret = RESUME_GUEST; - else { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } - return ret; -} - -static int kvm_trap_emul_vm_init(struct kvm *kvm) -{ - return 0; -} - -static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu) -{ - return 0; -} - -static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - uint32_t config1; - int vcpu_id = vcpu->vcpu_id; - - /* - * Arch specific stuff, set up config registers properly so that the - * guest will come up as expected, for now we simulate a MIPS 24kc - */ - kvm_write_c0_guest_prid(cop0, 0x00019300); - kvm_write_c0_guest_config(cop0, - MIPS_CONFIG0 | (0x1 << CP0C0_AR) | - (MMU_TYPE_R4000 << CP0C0_MT)); - - /* Read the cache characteristics from the host Config1 Register */ - config1 = (read_c0_config1() & ~0x7f); - - /* Set up MMU size */ - config1 &= ~(0x3f << 25); - config1 |= ((KVM_MIPS_GUEST_TLB_SIZE - 1) << 25); - - /* We unset some bits that we aren't emulating */ - config1 &= - ~((1 << CP0C1_C2) | (1 << CP0C1_MD) | (1 << CP0C1_PC) | - (1 << CP0C1_WR) | (1 << CP0C1_CA)); - kvm_write_c0_guest_config1(cop0, config1); - - kvm_write_c0_guest_config2(cop0, MIPS_CONFIG2); - /* MIPS_CONFIG2 | (read_c0_config2() & 0xfff) */ - kvm_write_c0_guest_config3(cop0, MIPS_CONFIG3 | (0 << CP0C3_VInt) | - (1 << CP0C3_ULRI)); - - /* Set Wait IE/IXMT Ignore in Config7, IAR, AR */ - kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10)); - - /* - * Setup IntCtl defaults, compatibilty mode for timer interrupts (HW5) - */ - kvm_write_c0_guest_intctl(cop0, 0xFC000000); - - /* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */ - kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 | (vcpu_id & 0xFF)); - - return 0; -} - -static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu, - const struct kvm_one_reg *reg, - s64 *v) -{ - switch (reg->id) { - case KVM_REG_MIPS_CP0_COUNT: - *v = kvm_mips_read_count(vcpu); - break; - case KVM_REG_MIPS_COUNT_CTL: - *v = vcpu->arch.count_ctl; - break; - case KVM_REG_MIPS_COUNT_RESUME: - *v = ktime_to_ns(vcpu->arch.count_resume); - break; - case KVM_REG_MIPS_COUNT_HZ: - *v = vcpu->arch.count_hz; - break; - default: - return -EINVAL; - } - return 0; -} - -static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, - const struct kvm_one_reg *reg, - s64 v) -{ - struct mips_coproc *cop0 = vcpu->arch.cop0; - int ret = 0; - - switch (reg->id) { - case KVM_REG_MIPS_CP0_COUNT: - kvm_mips_write_count(vcpu, v); - break; - case KVM_REG_MIPS_CP0_COMPARE: - kvm_mips_write_compare(vcpu, v); - break; - case KVM_REG_MIPS_CP0_CAUSE: - /* - * If the timer is stopped or started (DC bit) it must look - * atomic with changes to the interrupt pending bits (TI, IRQ5). - * A timer interrupt should not happen in between. - */ - if ((kvm_read_c0_guest_cause(cop0) ^ v) & CAUSEF_DC) { - if (v & CAUSEF_DC) { - /* disable timer first */ - kvm_mips_count_disable_cause(vcpu); - kvm_change_c0_guest_cause(cop0, ~CAUSEF_DC, v); - } else { - /* enable timer last */ - kvm_change_c0_guest_cause(cop0, ~CAUSEF_DC, v); - kvm_mips_count_enable_cause(vcpu); - } - } else { - kvm_write_c0_guest_cause(cop0, v); - } - break; - case KVM_REG_MIPS_COUNT_CTL: - ret = kvm_mips_set_count_ctl(vcpu, v); - break; - case KVM_REG_MIPS_COUNT_RESUME: - ret = kvm_mips_set_count_resume(vcpu, v); - break; - case KVM_REG_MIPS_COUNT_HZ: - ret = kvm_mips_set_count_hz(vcpu, v); - break; - default: - return -EINVAL; - } - return ret; -} - -static struct kvm_mips_callbacks kvm_trap_emul_callbacks = { - /* exit handlers */ - .handle_cop_unusable = kvm_trap_emul_handle_cop_unusable, - .handle_tlb_mod = kvm_trap_emul_handle_tlb_mod, - .handle_tlb_st_miss = kvm_trap_emul_handle_tlb_st_miss, - .handle_tlb_ld_miss = kvm_trap_emul_handle_tlb_ld_miss, - .handle_addr_err_st = kvm_trap_emul_handle_addr_err_st, - .handle_addr_err_ld = kvm_trap_emul_handle_addr_err_ld, - .handle_syscall = kvm_trap_emul_handle_syscall, - .handle_res_inst = kvm_trap_emul_handle_res_inst, - .handle_break = kvm_trap_emul_handle_break, - - .vm_init = kvm_trap_emul_vm_init, - .vcpu_init = kvm_trap_emul_vcpu_init, - .vcpu_setup = kvm_trap_emul_vcpu_setup, - .gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb, - .queue_timer_int = kvm_mips_queue_timer_int_cb, - .dequeue_timer_int = kvm_mips_dequeue_timer_int_cb, - .queue_io_int = kvm_mips_queue_io_int_cb, - .dequeue_io_int = kvm_mips_dequeue_io_int_cb, - .irq_deliver = kvm_mips_irq_deliver_cb, - .irq_clear = kvm_mips_irq_clear_cb, - .get_one_reg = kvm_trap_emul_get_one_reg, - .set_one_reg = kvm_trap_emul_set_one_reg, -}; - -int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) -{ - *install_callbacks = &kvm_trap_emul_callbacks; - return 0; -} diff --git a/arch/mips/kvm/locore.S b/arch/mips/kvm/locore.S new file mode 100644 index 000000000000..d7279c03c517 --- /dev/null +++ b/arch/mips/kvm/locore.S @@ -0,0 +1,620 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Main entry point for the guest, exception handling. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include + +#define _C_LABEL(x) x +#define MIPSX(name) mips32_ ## name +#define CALLFRAME_SIZ 32 + +/* + * VECTOR + * exception vector entrypoint + */ +#define VECTOR(x, regmask) \ + .ent _C_LABEL(x),0; \ + EXPORT(x); + +#define VECTOR_END(x) \ + EXPORT(x); + +/* Overload, Danger Will Robinson!! */ +#define PT_HOST_ASID PT_BVADDR +#define PT_HOST_USERLOCAL PT_EPC + +#define CP0_DDATA_LO $28,3 +#define CP0_EBASE $15,1 + +#define CP0_INTCTL $12,1 +#define CP0_SRSCTL $12,2 +#define CP0_SRSMAP $12,3 +#define CP0_HWRENA $7,0 + +/* Resume Flags */ +#define RESUME_FLAG_HOST (1<<1) /* Resume host? */ + +#define RESUME_GUEST 0 +#define RESUME_HOST RESUME_FLAG_HOST + +/* + * __kvm_mips_vcpu_run: entry point to the guest + * a0: run + * a1: vcpu + */ + .set noreorder + .set noat + +FEXPORT(__kvm_mips_vcpu_run) + /* k0/k1 not being used in host kernel context */ + INT_ADDIU k1, sp, -PT_SIZE + LONG_S $0, PT_R0(k1) + LONG_S $1, PT_R1(k1) + LONG_S $2, PT_R2(k1) + LONG_S $3, PT_R3(k1) + + LONG_S $4, PT_R4(k1) + LONG_S $5, PT_R5(k1) + LONG_S $6, PT_R6(k1) + LONG_S $7, PT_R7(k1) + + LONG_S $8, PT_R8(k1) + LONG_S $9, PT_R9(k1) + LONG_S $10, PT_R10(k1) + LONG_S $11, PT_R11(k1) + LONG_S $12, PT_R12(k1) + LONG_S $13, PT_R13(k1) + LONG_S $14, PT_R14(k1) + LONG_S $15, PT_R15(k1) + LONG_S $16, PT_R16(k1) + LONG_S $17, PT_R17(k1) + + LONG_S $18, PT_R18(k1) + LONG_S $19, PT_R19(k1) + LONG_S $20, PT_R20(k1) + LONG_S $21, PT_R21(k1) + LONG_S $22, PT_R22(k1) + LONG_S $23, PT_R23(k1) + LONG_S $24, PT_R24(k1) + LONG_S $25, PT_R25(k1) + + /* + * XXXKYMA k0/k1 not saved, not being used if we got here through + * an ioctl() + */ + + LONG_S $28, PT_R28(k1) + LONG_S $29, PT_R29(k1) + LONG_S $30, PT_R30(k1) + LONG_S $31, PT_R31(k1) + + /* Save hi/lo */ + mflo v0 + LONG_S v0, PT_LO(k1) + mfhi v1 + LONG_S v1, PT_HI(k1) + + /* Save host status */ + mfc0 v0, CP0_STATUS + LONG_S v0, PT_STATUS(k1) + + /* Save host ASID, shove it into the BVADDR location */ + mfc0 v1, CP0_ENTRYHI + andi v1, 0xff + LONG_S v1, PT_HOST_ASID(k1) + + /* Save DDATA_LO, will be used to store pointer to vcpu */ + mfc0 v1, CP0_DDATA_LO + LONG_S v1, PT_HOST_USERLOCAL(k1) + + /* DDATA_LO has pointer to vcpu */ + mtc0 a1, CP0_DDATA_LO + + /* Offset into vcpu->arch */ + INT_ADDIU k1, a1, VCPU_HOST_ARCH + + /* + * Save the host stack to VCPU, used for exception processing + * when we exit from the Guest + */ + LONG_S sp, VCPU_HOST_STACK(k1) + + /* Save the kernel gp as well */ + LONG_S gp, VCPU_HOST_GP(k1) + + /* + * Setup status register for running the guest in UM, interrupts + * are disabled + */ + li k0, (ST0_EXL | KSU_USER | ST0_BEV) + mtc0 k0, CP0_STATUS + ehb + + /* load up the new EBASE */ + LONG_L k0, VCPU_GUEST_EBASE(k1) + mtc0 k0, CP0_EBASE + + /* + * Now that the new EBASE has been loaded, unset BEV, set + * interrupt mask as it was but make sure that timer interrupts + * are enabled + */ + li k0, (ST0_EXL | KSU_USER | ST0_IE) + andi v0, v0, ST0_IM + or k0, k0, v0 + mtc0 k0, CP0_STATUS + ehb + + /* Set Guest EPC */ + LONG_L t0, VCPU_PC(k1) + mtc0 t0, CP0_EPC + +FEXPORT(__kvm_mips_load_asid) + /* Set the ASID for the Guest Kernel */ + INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ + /* addresses shift to 0x80000000 */ + bltz t0, 1f /* If kernel */ + INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ + INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */ +1: + /* t1: contains the base of the ASID array, need to get the cpu id */ + LONG_L t2, TI_CPU($28) /* smp_processor_id */ + INT_SLL t2, t2, 2 /* x4 */ + REG_ADDU t3, t1, t2 + LONG_L k0, (t3) + andi k0, k0, 0xff + mtc0 k0, CP0_ENTRYHI + ehb + + /* Disable RDHWR access */ + mtc0 zero, CP0_HWRENA + + /* Now load up the Guest Context from VCPU */ + LONG_L $1, VCPU_R1(k1) + LONG_L $2, VCPU_R2(k1) + LONG_L $3, VCPU_R3(k1) + + LONG_L $4, VCPU_R4(k1) + LONG_L $5, VCPU_R5(k1) + LONG_L $6, VCPU_R6(k1) + LONG_L $7, VCPU_R7(k1) + + LONG_L $8, VCPU_R8(k1) + LONG_L $9, VCPU_R9(k1) + LONG_L $10, VCPU_R10(k1) + LONG_L $11, VCPU_R11(k1) + LONG_L $12, VCPU_R12(k1) + LONG_L $13, VCPU_R13(k1) + LONG_L $14, VCPU_R14(k1) + LONG_L $15, VCPU_R15(k1) + LONG_L $16, VCPU_R16(k1) + LONG_L $17, VCPU_R17(k1) + LONG_L $18, VCPU_R18(k1) + LONG_L $19, VCPU_R19(k1) + LONG_L $20, VCPU_R20(k1) + LONG_L $21, VCPU_R21(k1) + LONG_L $22, VCPU_R22(k1) + LONG_L $23, VCPU_R23(k1) + LONG_L $24, VCPU_R24(k1) + LONG_L $25, VCPU_R25(k1) + + /* k0/k1 loaded up later */ + + LONG_L $28, VCPU_R28(k1) + LONG_L $29, VCPU_R29(k1) + LONG_L $30, VCPU_R30(k1) + LONG_L $31, VCPU_R31(k1) + + /* Restore hi/lo */ + LONG_L k0, VCPU_LO(k1) + mtlo k0 + + LONG_L k0, VCPU_HI(k1) + mthi k0 + +FEXPORT(__kvm_mips_load_k0k1) + /* Restore the guest's k0/k1 registers */ + LONG_L k0, VCPU_R26(k1) + LONG_L k1, VCPU_R27(k1) + + /* Jump to guest */ + eret + +VECTOR(MIPSX(exception), unknown) +/* Find out what mode we came from and jump to the proper handler. */ + mtc0 k0, CP0_ERROREPC #01: Save guest k0 + ehb #02: + + mfc0 k0, CP0_EBASE #02: Get EBASE + INT_SRL k0, k0, 10 #03: Get rid of CPUNum + INT_SLL k0, k0, 10 #04 + LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000 + INT_ADDIU k0, k0, 0x2000 #06: Exception handler is + # installed @ offset 0x2000 + j k0 #07: jump to the function + nop #08: branch delay slot +VECTOR_END(MIPSX(exceptionEnd)) +.end MIPSX(exception) + +/* + * Generic Guest exception handler. We end up here when the guest + * does something that causes a trap to kernel mode. + */ +NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) + /* Get the VCPU pointer from DDTATA_LO */ + mfc0 k1, CP0_DDATA_LO + INT_ADDIU k1, k1, VCPU_HOST_ARCH + + /* Start saving Guest context to VCPU */ + LONG_S $0, VCPU_R0(k1) + LONG_S $1, VCPU_R1(k1) + LONG_S $2, VCPU_R2(k1) + LONG_S $3, VCPU_R3(k1) + LONG_S $4, VCPU_R4(k1) + LONG_S $5, VCPU_R5(k1) + LONG_S $6, VCPU_R6(k1) + LONG_S $7, VCPU_R7(k1) + LONG_S $8, VCPU_R8(k1) + LONG_S $9, VCPU_R9(k1) + LONG_S $10, VCPU_R10(k1) + LONG_S $11, VCPU_R11(k1) + LONG_S $12, VCPU_R12(k1) + LONG_S $13, VCPU_R13(k1) + LONG_S $14, VCPU_R14(k1) + LONG_S $15, VCPU_R15(k1) + LONG_S $16, VCPU_R16(k1) + LONG_S $17, VCPU_R17(k1) + LONG_S $18, VCPU_R18(k1) + LONG_S $19, VCPU_R19(k1) + LONG_S $20, VCPU_R20(k1) + LONG_S $21, VCPU_R21(k1) + LONG_S $22, VCPU_R22(k1) + LONG_S $23, VCPU_R23(k1) + LONG_S $24, VCPU_R24(k1) + LONG_S $25, VCPU_R25(k1) + + /* Guest k0/k1 saved later */ + + LONG_S $28, VCPU_R28(k1) + LONG_S $29, VCPU_R29(k1) + LONG_S $30, VCPU_R30(k1) + LONG_S $31, VCPU_R31(k1) + + /* We need to save hi/lo and restore them on the way out */ + mfhi t0 + LONG_S t0, VCPU_HI(k1) + + mflo t0 + LONG_S t0, VCPU_LO(k1) + + /* Finally save guest k0/k1 to VCPU */ + mfc0 t0, CP0_ERROREPC + LONG_S t0, VCPU_R26(k1) + + /* Get GUEST k1 and save it in VCPU */ + PTR_LI t1, ~0x2ff + mfc0 t0, CP0_EBASE + and t0, t0, t1 + LONG_L t0, 0x3000(t0) + LONG_S t0, VCPU_R27(k1) + + /* Now that context has been saved, we can use other registers */ + + /* Restore vcpu */ + mfc0 a1, CP0_DDATA_LO + move s1, a1 + + /* Restore run (vcpu->run) */ + LONG_L a0, VCPU_RUN(a1) + /* Save pointer to run in s0, will be saved by the compiler */ + move s0, a0 + + /* + * Save Host level EPC, BadVaddr and Cause to VCPU, useful to + * process the exception + */ + mfc0 k0,CP0_EPC + LONG_S k0, VCPU_PC(k1) + + mfc0 k0, CP0_BADVADDR + LONG_S k0, VCPU_HOST_CP0_BADVADDR(k1) + + mfc0 k0, CP0_CAUSE + LONG_S k0, VCPU_HOST_CP0_CAUSE(k1) + + mfc0 k0, CP0_ENTRYHI + LONG_S k0, VCPU_HOST_ENTRYHI(k1) + + /* Now restore the host state just enough to run the handlers */ + + /* Swtich EBASE to the one used by Linux */ + /* load up the host EBASE */ + mfc0 v0, CP0_STATUS + + .set at + or k0, v0, ST0_BEV + .set noat + + mtc0 k0, CP0_STATUS + ehb + + LONG_L k0, VCPU_HOST_EBASE(k1) + mtc0 k0,CP0_EBASE + + /* Now that the new EBASE has been loaded, unset BEV and KSU_USER */ + .set at + and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE) + or v0, v0, ST0_CU0 + .set noat + mtc0 v0, CP0_STATUS + ehb + + /* Load up host GP */ + LONG_L gp, VCPU_HOST_GP(k1) + + /* Need a stack before we can jump to "C" */ + LONG_L sp, VCPU_HOST_STACK(k1) + + /* Saved host state */ + INT_ADDIU sp, sp, -PT_SIZE + + /* + * XXXKYMA do we need to load the host ASID, maybe not because the + * kernel entries are marked GLOBAL, need to verify + */ + + /* Restore host DDATA_LO */ + LONG_L k0, PT_HOST_USERLOCAL(sp) + mtc0 k0, CP0_DDATA_LO + + /* Restore RDHWR access */ + PTR_LI k0, 0x2000000F + mtc0 k0, CP0_HWRENA + + /* Jump to handler */ +FEXPORT(__kvm_mips_jump_to_handler) + /* + * XXXKYMA: not sure if this is safe, how large is the stack?? + * Now jump to the kvm_mips_handle_exit() to see if we can deal + * with this in the kernel + */ + PTR_LA t9, kvm_mips_handle_exit + jalr.hb t9 + INT_ADDIU sp, sp, -CALLFRAME_SIZ /* BD Slot */ + + /* Return from handler Make sure interrupts are disabled */ + di + ehb + + /* + * XXXKYMA: k0/k1 could have been blown away if we processed + * an exception while we were handling the exception from the + * guest, reload k1 + */ + + move k1, s1 + INT_ADDIU k1, k1, VCPU_HOST_ARCH + + /* + * Check return value, should tell us if we are returning to the + * host (handle I/O etc)or resuming the guest + */ + andi t0, v0, RESUME_HOST + bnez t0, __kvm_mips_return_to_host + nop + +__kvm_mips_return_to_guest: + /* Put the saved pointer to vcpu (s1) back into the DDATA_LO Register */ + mtc0 s1, CP0_DDATA_LO + + /* Load up the Guest EBASE to minimize the window where BEV is set */ + LONG_L t0, VCPU_GUEST_EBASE(k1) + + /* Switch EBASE back to the one used by KVM */ + mfc0 v1, CP0_STATUS + .set at + or k0, v1, ST0_BEV + .set noat + mtc0 k0, CP0_STATUS + ehb + mtc0 t0, CP0_EBASE + + /* Setup status register for running guest in UM */ + .set at + or v1, v1, (ST0_EXL | KSU_USER | ST0_IE) + and v1, v1, ~ST0_CU0 + .set noat + mtc0 v1, CP0_STATUS + ehb + + /* Set Guest EPC */ + LONG_L t0, VCPU_PC(k1) + mtc0 t0, CP0_EPC + + /* Set the ASID for the Guest Kernel */ + INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */ + /* addresses shift to 0x80000000 */ + bltz t0, 1f /* If kernel */ + INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */ + INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */ +1: + /* t1: contains the base of the ASID array, need to get the cpu id */ + LONG_L t2, TI_CPU($28) /* smp_processor_id */ + INT_SLL t2, t2, 2 /* x4 */ + REG_ADDU t3, t1, t2 + LONG_L k0, (t3) + andi k0, k0, 0xff + mtc0 k0,CP0_ENTRYHI + ehb + + /* Disable RDHWR access */ + mtc0 zero, CP0_HWRENA + + /* load the guest context from VCPU and return */ + LONG_L $0, VCPU_R0(k1) + LONG_L $1, VCPU_R1(k1) + LONG_L $2, VCPU_R2(k1) + LONG_L $3, VCPU_R3(k1) + LONG_L $4, VCPU_R4(k1) + LONG_L $5, VCPU_R5(k1) + LONG_L $6, VCPU_R6(k1) + LONG_L $7, VCPU_R7(k1) + LONG_L $8, VCPU_R8(k1) + LONG_L $9, VCPU_R9(k1) + LONG_L $10, VCPU_R10(k1) + LONG_L $11, VCPU_R11(k1) + LONG_L $12, VCPU_R12(k1) + LONG_L $13, VCPU_R13(k1) + LONG_L $14, VCPU_R14(k1) + LONG_L $15, VCPU_R15(k1) + LONG_L $16, VCPU_R16(k1) + LONG_L $17, VCPU_R17(k1) + LONG_L $18, VCPU_R18(k1) + LONG_L $19, VCPU_R19(k1) + LONG_L $20, VCPU_R20(k1) + LONG_L $21, VCPU_R21(k1) + LONG_L $22, VCPU_R22(k1) + LONG_L $23, VCPU_R23(k1) + LONG_L $24, VCPU_R24(k1) + LONG_L $25, VCPU_R25(k1) + + /* $/k1 loaded later */ + LONG_L $28, VCPU_R28(k1) + LONG_L $29, VCPU_R29(k1) + LONG_L $30, VCPU_R30(k1) + LONG_L $31, VCPU_R31(k1) + +FEXPORT(__kvm_mips_skip_guest_restore) + LONG_L k0, VCPU_HI(k1) + mthi k0 + + LONG_L k0, VCPU_LO(k1) + mtlo k0 + + LONG_L k0, VCPU_R26(k1) + LONG_L k1, VCPU_R27(k1) + + eret + +__kvm_mips_return_to_host: + /* EBASE is already pointing to Linux */ + LONG_L k1, VCPU_HOST_STACK(k1) + INT_ADDIU k1,k1, -PT_SIZE + + /* Restore host DDATA_LO */ + LONG_L k0, PT_HOST_USERLOCAL(k1) + mtc0 k0, CP0_DDATA_LO + + /* Restore host ASID */ + LONG_L k0, PT_HOST_ASID(sp) + andi k0, 0xff + mtc0 k0,CP0_ENTRYHI + ehb + + /* Load context saved on the host stack */ + LONG_L $0, PT_R0(k1) + LONG_L $1, PT_R1(k1) + + /* + * r2/v0 is the return code, shift it down by 2 (arithmetic) + * to recover the err code + */ + INT_SRA k0, v0, 2 + move $2, k0 + + LONG_L $3, PT_R3(k1) + LONG_L $4, PT_R4(k1) + LONG_L $5, PT_R5(k1) + LONG_L $6, PT_R6(k1) + LONG_L $7, PT_R7(k1) + LONG_L $8, PT_R8(k1) + LONG_L $9, PT_R9(k1) + LONG_L $10, PT_R10(k1) + LONG_L $11, PT_R11(k1) + LONG_L $12, PT_R12(k1) + LONG_L $13, PT_R13(k1) + LONG_L $14, PT_R14(k1) + LONG_L $15, PT_R15(k1) + LONG_L $16, PT_R16(k1) + LONG_L $17, PT_R17(k1) + LONG_L $18, PT_R18(k1) + LONG_L $19, PT_R19(k1) + LONG_L $20, PT_R20(k1) + LONG_L $21, PT_R21(k1) + LONG_L $22, PT_R22(k1) + LONG_L $23, PT_R23(k1) + LONG_L $24, PT_R24(k1) + LONG_L $25, PT_R25(k1) + + /* Host k0/k1 were not saved */ + + LONG_L $28, PT_R28(k1) + LONG_L $29, PT_R29(k1) + LONG_L $30, PT_R30(k1) + + LONG_L k0, PT_HI(k1) + mthi k0 + + LONG_L k0, PT_LO(k1) + mtlo k0 + + /* Restore RDHWR access */ + PTR_LI k0, 0x2000000F + mtc0 k0, CP0_HWRENA + + /* Restore RA, which is the address we will return to */ + LONG_L ra, PT_R31(k1) + j ra + nop + +VECTOR_END(MIPSX(GuestExceptionEnd)) +.end MIPSX(GuestException) + +MIPSX(exceptions): + #### + ##### The exception handlers. + ##### + .word _C_LABEL(MIPSX(GuestException)) # 0 + .word _C_LABEL(MIPSX(GuestException)) # 1 + .word _C_LABEL(MIPSX(GuestException)) # 2 + .word _C_LABEL(MIPSX(GuestException)) # 3 + .word _C_LABEL(MIPSX(GuestException)) # 4 + .word _C_LABEL(MIPSX(GuestException)) # 5 + .word _C_LABEL(MIPSX(GuestException)) # 6 + .word _C_LABEL(MIPSX(GuestException)) # 7 + .word _C_LABEL(MIPSX(GuestException)) # 8 + .word _C_LABEL(MIPSX(GuestException)) # 9 + .word _C_LABEL(MIPSX(GuestException)) # 10 + .word _C_LABEL(MIPSX(GuestException)) # 11 + .word _C_LABEL(MIPSX(GuestException)) # 12 + .word _C_LABEL(MIPSX(GuestException)) # 13 + .word _C_LABEL(MIPSX(GuestException)) # 14 + .word _C_LABEL(MIPSX(GuestException)) # 15 + .word _C_LABEL(MIPSX(GuestException)) # 16 + .word _C_LABEL(MIPSX(GuestException)) # 17 + .word _C_LABEL(MIPSX(GuestException)) # 18 + .word _C_LABEL(MIPSX(GuestException)) # 19 + .word _C_LABEL(MIPSX(GuestException)) # 20 + .word _C_LABEL(MIPSX(GuestException)) # 21 + .word _C_LABEL(MIPSX(GuestException)) # 22 + .word _C_LABEL(MIPSX(GuestException)) # 23 + .word _C_LABEL(MIPSX(GuestException)) # 24 + .word _C_LABEL(MIPSX(GuestException)) # 25 + .word _C_LABEL(MIPSX(GuestException)) # 26 + .word _C_LABEL(MIPSX(GuestException)) # 27 + .word _C_LABEL(MIPSX(GuestException)) # 28 + .word _C_LABEL(MIPSX(GuestException)) # 29 + .word _C_LABEL(MIPSX(GuestException)) # 30 + .word _C_LABEL(MIPSX(GuestException)) # 31 diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c new file mode 100644 index 000000000000..d687c6e3258d --- /dev/null +++ b/arch/mips/kvm/mips.c @@ -0,0 +1,1218 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: MIPS specific KVM APIs + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "interrupt.h" +#include "commpage.h" + +#define CREATE_TRACE_POINTS +#include "trace.h" + +#ifndef VECTORSPACING +#define VECTORSPACING 0x100 /* for EI/VI mode */ +#endif + +#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x) +struct kvm_stats_debugfs_item debugfs_entries[] = { + { "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU }, + { "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU }, + { "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU }, + { "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU }, + { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU }, + { "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU }, + { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU }, + { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU }, + { "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU }, + { "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU }, + { "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU }, + { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU }, + { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU }, + { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU }, + { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU }, + {NULL} +}; + +static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu) +{ + int i; + + for_each_possible_cpu(i) { + vcpu->arch.guest_kernel_asid[i] = 0; + vcpu->arch.guest_user_asid[i] = 0; + } + + return 0; +} + +/* + * XXXKYMA: We are simulatoring a processor that has the WII bit set in + * Config7, so we are "runnable" if interrupts are pending + */ +int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) +{ + return !!(vcpu->arch.pending_exceptions); +} + +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) +{ + return 1; +} + +int kvm_arch_hardware_enable(void *garbage) +{ + return 0; +} + +void kvm_arch_hardware_disable(void *garbage) +{ +} + +int kvm_arch_hardware_setup(void) +{ + return 0; +} + +void kvm_arch_hardware_unsetup(void) +{ +} + +void kvm_arch_check_processor_compat(void *rtn) +{ + *(int *)rtn = 0; +} + +static void kvm_mips_init_tlbs(struct kvm *kvm) +{ + unsigned long wired; + + /* + * Add a wired entry to the TLB, it is used to map the commpage to + * the Guest kernel + */ + wired = read_c0_wired(); + write_c0_wired(wired + 1); + mtc0_tlbw_hazard(); + kvm->arch.commpage_tlb = wired; + + kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(), + kvm->arch.commpage_tlb); +} + +static void kvm_mips_init_vm_percpu(void *arg) +{ + struct kvm *kvm = (struct kvm *)arg; + + kvm_mips_init_tlbs(kvm); + kvm_mips_callbacks->vm_init(kvm); + +} + +int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) +{ + if (atomic_inc_return(&kvm_mips_instance) == 1) { + kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n", + __func__); + on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1); + } + + return 0; +} + +void kvm_mips_free_vcpus(struct kvm *kvm) +{ + unsigned int i; + struct kvm_vcpu *vcpu; + + /* Put the pages we reserved for the guest pmap */ + for (i = 0; i < kvm->arch.guest_pmap_npages; i++) { + if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE) + kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]); + } + kfree(kvm->arch.guest_pmap); + + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_arch_vcpu_free(vcpu); + } + + mutex_lock(&kvm->lock); + + for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) + kvm->vcpus[i] = NULL; + + atomic_set(&kvm->online_vcpus, 0); + + mutex_unlock(&kvm->lock); +} + +void kvm_arch_sync_events(struct kvm *kvm) +{ +} + +static void kvm_mips_uninit_tlbs(void *arg) +{ + /* Restore wired count */ + write_c0_wired(0); + mtc0_tlbw_hazard(); + /* Clear out all the TLBs */ + kvm_local_flush_tlb_all(); +} + +void kvm_arch_destroy_vm(struct kvm *kvm) +{ + kvm_mips_free_vcpus(kvm); + + /* If this is the last instance, restore wired count */ + if (atomic_dec_return(&kvm_mips_instance) == 0) { + kvm_debug("%s: last KVM instance, restoring TLB parameters\n", + __func__); + on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1); + } +} + +long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + return -ENOIOCTLCMD; +} + +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, + struct kvm_memory_slot *dont) +{ +} + +int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, + unsigned long npages) +{ + return 0; +} + +void kvm_arch_memslots_updated(struct kvm *kvm) +{ +} + +int kvm_arch_prepare_memory_region(struct kvm *kvm, + struct kvm_memory_slot *memslot, + struct kvm_userspace_memory_region *mem, + enum kvm_mr_change change) +{ + return 0; +} + +void kvm_arch_commit_memory_region(struct kvm *kvm, + struct kvm_userspace_memory_region *mem, + const struct kvm_memory_slot *old, + enum kvm_mr_change change) +{ + unsigned long npages = 0; + int i; + + kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n", + __func__, kvm, mem->slot, mem->guest_phys_addr, + mem->memory_size, mem->userspace_addr); + + /* Setup Guest PMAP table */ + if (!kvm->arch.guest_pmap) { + if (mem->slot == 0) + npages = mem->memory_size >> PAGE_SHIFT; + + if (npages) { + kvm->arch.guest_pmap_npages = npages; + kvm->arch.guest_pmap = + kzalloc(npages * sizeof(unsigned long), GFP_KERNEL); + + if (!kvm->arch.guest_pmap) { + kvm_err("Failed to allocate guest PMAP"); + return; + } + + kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n", + npages, kvm->arch.guest_pmap); + + /* Now setup the page table */ + for (i = 0; i < npages; i++) + kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE; + } + } +} + +void kvm_arch_flush_shadow_all(struct kvm *kvm) +{ +} + +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ +} + +void kvm_arch_flush_shadow(struct kvm *kvm) +{ +} + +struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) +{ + int err, size, offset; + void *gebase; + int i; + + struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); + + if (!vcpu) { + err = -ENOMEM; + goto out; + } + + err = kvm_vcpu_init(vcpu, kvm, id); + + if (err) + goto out_free_cpu; + + kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu); + + /* + * Allocate space for host mode exception handlers that handle + * guest mode exits + */ + if (cpu_has_veic || cpu_has_vint) + size = 0x200 + VECTORSPACING * 64; + else + size = 0x4000; + + /* Save Linux EBASE */ + vcpu->arch.host_ebase = (void *)read_c0_ebase(); + + gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL); + + if (!gebase) { + err = -ENOMEM; + goto out_free_cpu; + } + kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n", + ALIGN(size, PAGE_SIZE), gebase); + + /* Save new ebase */ + vcpu->arch.guest_ebase = gebase; + + /* Copy L1 Guest Exception handler to correct offset */ + + /* TLB Refill, EXL = 0 */ + memcpy(gebase, mips32_exception, + mips32_exceptionEnd - mips32_exception); + + /* General Exception Entry point */ + memcpy(gebase + 0x180, mips32_exception, + mips32_exceptionEnd - mips32_exception); + + /* For vectored interrupts poke the exception code @ all offsets 0-7 */ + for (i = 0; i < 8; i++) { + kvm_debug("L1 Vectored handler @ %p\n", + gebase + 0x200 + (i * VECTORSPACING)); + memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception, + mips32_exceptionEnd - mips32_exception); + } + + /* General handler, relocate to unmapped space for sanity's sake */ + offset = 0x2000; + kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n", + gebase + offset, + mips32_GuestExceptionEnd - mips32_GuestException); + + memcpy(gebase + offset, mips32_GuestException, + mips32_GuestExceptionEnd - mips32_GuestException); + + /* Invalidate the icache for these ranges */ + local_flush_icache_range((unsigned long)gebase, + (unsigned long)gebase + ALIGN(size, PAGE_SIZE)); + + /* + * Allocate comm page for guest kernel, a TLB will be reserved for + * mapping GVA @ 0xFFFF8000 to this page + */ + vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL); + + if (!vcpu->arch.kseg0_commpage) { + err = -ENOMEM; + goto out_free_gebase; + } + + kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage); + kvm_mips_commpage_init(vcpu); + + /* Init */ + vcpu->arch.last_sched_cpu = -1; + + /* Start off the timer */ + kvm_mips_init_count(vcpu); + + return vcpu; + +out_free_gebase: + kfree(gebase); + +out_free_cpu: + kfree(vcpu); + +out: + return ERR_PTR(err); +} + +void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) +{ + hrtimer_cancel(&vcpu->arch.comparecount_timer); + + kvm_vcpu_uninit(vcpu); + + kvm_mips_dump_stats(vcpu); + + kfree(vcpu->arch.guest_ebase); + kfree(vcpu->arch.kseg0_commpage); +} + +void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) +{ + kvm_arch_vcpu_free(vcpu); +} + +int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, + struct kvm_guest_debug *dbg) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + int r = 0; + sigset_t sigsaved; + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); + + if (vcpu->mmio_needed) { + if (!vcpu->mmio_is_write) + kvm_mips_complete_mmio_load(vcpu, run); + vcpu->mmio_needed = 0; + } + + local_irq_disable(); + /* Check if we have any exceptions/interrupts pending */ + kvm_mips_deliver_interrupts(vcpu, + kvm_read_c0_guest_cause(vcpu->arch.cop0)); + + kvm_guest_enter(); + + r = __kvm_mips_vcpu_run(run, vcpu); + + kvm_guest_exit(); + local_irq_enable(); + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + + return r; +} + +int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) +{ + int intr = (int)irq->irq; + struct kvm_vcpu *dvcpu = NULL; + + if (intr == 3 || intr == -3 || intr == 4 || intr == -4) + kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu, + (int)intr); + + if (irq->cpu == -1) + dvcpu = vcpu; + else + dvcpu = vcpu->kvm->vcpus[irq->cpu]; + + if (intr == 2 || intr == 3 || intr == 4) { + kvm_mips_callbacks->queue_io_int(dvcpu, irq); + + } else if (intr == -2 || intr == -3 || intr == -4) { + kvm_mips_callbacks->dequeue_io_int(dvcpu, irq); + } else { + kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__, + irq->cpu, irq->irq); + return -EINVAL; + } + + dvcpu->arch.wait = 0; + + if (waitqueue_active(&dvcpu->wq)) + wake_up_interruptible(&dvcpu->wq); + + return 0; +} + +int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + return -ENOIOCTLCMD; +} + +static u64 kvm_mips_get_one_regs[] = { + KVM_REG_MIPS_R0, + KVM_REG_MIPS_R1, + KVM_REG_MIPS_R2, + KVM_REG_MIPS_R3, + KVM_REG_MIPS_R4, + KVM_REG_MIPS_R5, + KVM_REG_MIPS_R6, + KVM_REG_MIPS_R7, + KVM_REG_MIPS_R8, + KVM_REG_MIPS_R9, + KVM_REG_MIPS_R10, + KVM_REG_MIPS_R11, + KVM_REG_MIPS_R12, + KVM_REG_MIPS_R13, + KVM_REG_MIPS_R14, + KVM_REG_MIPS_R15, + KVM_REG_MIPS_R16, + KVM_REG_MIPS_R17, + KVM_REG_MIPS_R18, + KVM_REG_MIPS_R19, + KVM_REG_MIPS_R20, + KVM_REG_MIPS_R21, + KVM_REG_MIPS_R22, + KVM_REG_MIPS_R23, + KVM_REG_MIPS_R24, + KVM_REG_MIPS_R25, + KVM_REG_MIPS_R26, + KVM_REG_MIPS_R27, + KVM_REG_MIPS_R28, + KVM_REG_MIPS_R29, + KVM_REG_MIPS_R30, + KVM_REG_MIPS_R31, + + KVM_REG_MIPS_HI, + KVM_REG_MIPS_LO, + KVM_REG_MIPS_PC, + + KVM_REG_MIPS_CP0_INDEX, + KVM_REG_MIPS_CP0_CONTEXT, + KVM_REG_MIPS_CP0_USERLOCAL, + KVM_REG_MIPS_CP0_PAGEMASK, + KVM_REG_MIPS_CP0_WIRED, + KVM_REG_MIPS_CP0_HWRENA, + KVM_REG_MIPS_CP0_BADVADDR, + KVM_REG_MIPS_CP0_COUNT, + KVM_REG_MIPS_CP0_ENTRYHI, + KVM_REG_MIPS_CP0_COMPARE, + KVM_REG_MIPS_CP0_STATUS, + KVM_REG_MIPS_CP0_CAUSE, + KVM_REG_MIPS_CP0_EPC, + KVM_REG_MIPS_CP0_CONFIG, + KVM_REG_MIPS_CP0_CONFIG1, + KVM_REG_MIPS_CP0_CONFIG2, + KVM_REG_MIPS_CP0_CONFIG3, + KVM_REG_MIPS_CP0_CONFIG7, + KVM_REG_MIPS_CP0_ERROREPC, + + KVM_REG_MIPS_COUNT_CTL, + KVM_REG_MIPS_COUNT_RESUME, + KVM_REG_MIPS_COUNT_HZ, +}; + +static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + int ret; + s64 v; + + switch (reg->id) { + case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31: + v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0]; + break; + case KVM_REG_MIPS_HI: + v = (long)vcpu->arch.hi; + break; + case KVM_REG_MIPS_LO: + v = (long)vcpu->arch.lo; + break; + case KVM_REG_MIPS_PC: + v = (long)vcpu->arch.pc; + break; + + case KVM_REG_MIPS_CP0_INDEX: + v = (long)kvm_read_c0_guest_index(cop0); + break; + case KVM_REG_MIPS_CP0_CONTEXT: + v = (long)kvm_read_c0_guest_context(cop0); + break; + case KVM_REG_MIPS_CP0_USERLOCAL: + v = (long)kvm_read_c0_guest_userlocal(cop0); + break; + case KVM_REG_MIPS_CP0_PAGEMASK: + v = (long)kvm_read_c0_guest_pagemask(cop0); + break; + case KVM_REG_MIPS_CP0_WIRED: + v = (long)kvm_read_c0_guest_wired(cop0); + break; + case KVM_REG_MIPS_CP0_HWRENA: + v = (long)kvm_read_c0_guest_hwrena(cop0); + break; + case KVM_REG_MIPS_CP0_BADVADDR: + v = (long)kvm_read_c0_guest_badvaddr(cop0); + break; + case KVM_REG_MIPS_CP0_ENTRYHI: + v = (long)kvm_read_c0_guest_entryhi(cop0); + break; + case KVM_REG_MIPS_CP0_COMPARE: + v = (long)kvm_read_c0_guest_compare(cop0); + break; + case KVM_REG_MIPS_CP0_STATUS: + v = (long)kvm_read_c0_guest_status(cop0); + break; + case KVM_REG_MIPS_CP0_CAUSE: + v = (long)kvm_read_c0_guest_cause(cop0); + break; + case KVM_REG_MIPS_CP0_EPC: + v = (long)kvm_read_c0_guest_epc(cop0); + break; + case KVM_REG_MIPS_CP0_ERROREPC: + v = (long)kvm_read_c0_guest_errorepc(cop0); + break; + case KVM_REG_MIPS_CP0_CONFIG: + v = (long)kvm_read_c0_guest_config(cop0); + break; + case KVM_REG_MIPS_CP0_CONFIG1: + v = (long)kvm_read_c0_guest_config1(cop0); + break; + case KVM_REG_MIPS_CP0_CONFIG2: + v = (long)kvm_read_c0_guest_config2(cop0); + break; + case KVM_REG_MIPS_CP0_CONFIG3: + v = (long)kvm_read_c0_guest_config3(cop0); + break; + case KVM_REG_MIPS_CP0_CONFIG7: + v = (long)kvm_read_c0_guest_config7(cop0); + break; + /* registers to be handled specially */ + case KVM_REG_MIPS_CP0_COUNT: + case KVM_REG_MIPS_COUNT_CTL: + case KVM_REG_MIPS_COUNT_RESUME: + case KVM_REG_MIPS_COUNT_HZ: + ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v); + if (ret) + return ret; + break; + default: + return -EINVAL; + } + if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { + u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; + + return put_user(v, uaddr64); + } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { + u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; + u32 v32 = (u32)v; + + return put_user(v32, uaddr32); + } else { + return -EINVAL; + } +} + +static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + u64 v; + + if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) { + u64 __user *uaddr64 = (u64 __user *)(long)reg->addr; + + if (get_user(v, uaddr64) != 0) + return -EFAULT; + } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) { + u32 __user *uaddr32 = (u32 __user *)(long)reg->addr; + s32 v32; + + if (get_user(v32, uaddr32) != 0) + return -EFAULT; + v = (s64)v32; + } else { + return -EINVAL; + } + + switch (reg->id) { + case KVM_REG_MIPS_R0: + /* Silently ignore requests to set $0 */ + break; + case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31: + vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v; + break; + case KVM_REG_MIPS_HI: + vcpu->arch.hi = v; + break; + case KVM_REG_MIPS_LO: + vcpu->arch.lo = v; + break; + case KVM_REG_MIPS_PC: + vcpu->arch.pc = v; + break; + + case KVM_REG_MIPS_CP0_INDEX: + kvm_write_c0_guest_index(cop0, v); + break; + case KVM_REG_MIPS_CP0_CONTEXT: + kvm_write_c0_guest_context(cop0, v); + break; + case KVM_REG_MIPS_CP0_USERLOCAL: + kvm_write_c0_guest_userlocal(cop0, v); + break; + case KVM_REG_MIPS_CP0_PAGEMASK: + kvm_write_c0_guest_pagemask(cop0, v); + break; + case KVM_REG_MIPS_CP0_WIRED: + kvm_write_c0_guest_wired(cop0, v); + break; + case KVM_REG_MIPS_CP0_HWRENA: + kvm_write_c0_guest_hwrena(cop0, v); + break; + case KVM_REG_MIPS_CP0_BADVADDR: + kvm_write_c0_guest_badvaddr(cop0, v); + break; + case KVM_REG_MIPS_CP0_ENTRYHI: + kvm_write_c0_guest_entryhi(cop0, v); + break; + case KVM_REG_MIPS_CP0_STATUS: + kvm_write_c0_guest_status(cop0, v); + break; + case KVM_REG_MIPS_CP0_EPC: + kvm_write_c0_guest_epc(cop0, v); + break; + case KVM_REG_MIPS_CP0_ERROREPC: + kvm_write_c0_guest_errorepc(cop0, v); + break; + /* registers to be handled specially */ + case KVM_REG_MIPS_CP0_COUNT: + case KVM_REG_MIPS_CP0_COMPARE: + case KVM_REG_MIPS_CP0_CAUSE: + case KVM_REG_MIPS_COUNT_CTL: + case KVM_REG_MIPS_COUNT_RESUME: + case KVM_REG_MIPS_COUNT_HZ: + return kvm_mips_callbacks->set_one_reg(vcpu, reg, v); + default: + return -EINVAL; + } + return 0; +} + +long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = (void __user *)arg; + long r; + + switch (ioctl) { + case KVM_SET_ONE_REG: + case KVM_GET_ONE_REG: { + struct kvm_one_reg reg; + + if (copy_from_user(®, argp, sizeof(reg))) + return -EFAULT; + if (ioctl == KVM_SET_ONE_REG) + return kvm_mips_set_reg(vcpu, ®); + else + return kvm_mips_get_reg(vcpu, ®); + } + case KVM_GET_REG_LIST: { + struct kvm_reg_list __user *user_list = argp; + u64 __user *reg_dest; + struct kvm_reg_list reg_list; + unsigned n; + + if (copy_from_user(®_list, user_list, sizeof(reg_list))) + return -EFAULT; + n = reg_list.n; + reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs); + if (copy_to_user(user_list, ®_list, sizeof(reg_list))) + return -EFAULT; + if (n < reg_list.n) + return -E2BIG; + reg_dest = user_list->reg; + if (copy_to_user(reg_dest, kvm_mips_get_one_regs, + sizeof(kvm_mips_get_one_regs))) + return -EFAULT; + return 0; + } + case KVM_NMI: + /* Treat the NMI as a CPU reset */ + r = kvm_mips_reset_vcpu(vcpu); + break; + case KVM_INTERRUPT: + { + struct kvm_mips_interrupt irq; + + r = -EFAULT; + if (copy_from_user(&irq, argp, sizeof(irq))) + goto out; + + kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, + irq.irq); + + r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); + break; + } + default: + r = -ENOIOCTLCMD; + } + +out: + return r; +} + +/* Get (and clear) the dirty memory log for a memory slot. */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) +{ + struct kvm_memory_slot *memslot; + unsigned long ga, ga_end; + int is_dirty = 0; + int r; + unsigned long n; + + mutex_lock(&kvm->slots_lock); + + r = kvm_get_dirty_log(kvm, log, &is_dirty); + if (r) + goto out; + + /* If nothing is dirty, don't bother messing with page tables. */ + if (is_dirty) { + memslot = &kvm->memslots->memslots[log->slot]; + + ga = memslot->base_gfn << PAGE_SHIFT; + ga_end = ga + (memslot->npages << PAGE_SHIFT); + + kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga, + ga_end); + + n = kvm_dirty_bitmap_bytes(memslot); + memset(memslot->dirty_bitmap, 0, n); + } + + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; + +} + +long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) +{ + long r; + + switch (ioctl) { + default: + r = -ENOIOCTLCMD; + } + + return r; +} + +int kvm_arch_init(void *opaque) +{ + if (kvm_mips_callbacks) { + kvm_err("kvm: module already exists\n"); + return -EEXIST; + } + + return kvm_mips_emulation_init(&kvm_mips_callbacks); +} + +void kvm_arch_exit(void) +{ + kvm_mips_callbacks = NULL; +} + +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) +{ + return 0; +} + +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) +{ + return VM_FAULT_SIGBUS; +} + +int kvm_dev_ioctl_check_extension(long ext) +{ + int r; + + switch (ext) { + case KVM_CAP_ONE_REG: + r = 1; + break; + case KVM_CAP_COALESCED_MMIO: + r = KVM_COALESCED_MMIO_PAGE_OFFSET; + break; + default: + r = 0; + break; + } + return r; +} + +int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) +{ + return kvm_mips_pending_timer(vcpu); +} + +int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu) +{ + int i; + struct mips_coproc *cop0; + + if (!vcpu) + return -1; + + kvm_debug("VCPU Register Dump:\n"); + kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc); + kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions); + + for (i = 0; i < 32; i += 4) { + kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i, + vcpu->arch.gprs[i], + vcpu->arch.gprs[i + 1], + vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]); + } + kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi); + kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo); + + cop0 = vcpu->arch.cop0; + kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n", + kvm_read_c0_guest_status(cop0), + kvm_read_c0_guest_cause(cop0)); + + kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0)); + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + int i; + + for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) + vcpu->arch.gprs[i] = regs->gpr[i]; + vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */ + vcpu->arch.hi = regs->hi; + vcpu->arch.lo = regs->lo; + vcpu->arch.pc = regs->pc; + + return 0; +} + +int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) + regs->gpr[i] = vcpu->arch.gprs[i]; + + regs->hi = vcpu->arch.hi; + regs->lo = vcpu->arch.lo; + regs->pc = vcpu->arch.pc; + + return 0; +} + +static void kvm_mips_comparecount_func(unsigned long data) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; + + kvm_mips_callbacks->queue_timer_int(vcpu); + + vcpu->arch.wait = 0; + if (waitqueue_active(&vcpu->wq)) + wake_up_interruptible(&vcpu->wq); +} + +/* low level hrtimer wake routine */ +static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) +{ + struct kvm_vcpu *vcpu; + + vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer); + kvm_mips_comparecount_func((unsigned long) vcpu); + return kvm_mips_count_timeout(vcpu); +} + +int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) +{ + kvm_mips_callbacks->vcpu_init(vcpu); + hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup; + return 0; +} + +void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) +{ +} + +int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, + struct kvm_translation *tr) +{ + return 0; +} + +/* Initial guest state */ +int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) +{ + return kvm_mips_callbacks->vcpu_setup(vcpu); +} + +static void kvm_mips_set_c0_status(void) +{ + uint32_t status = read_c0_status(); + + if (cpu_has_fpu) + status |= (ST0_CU1); + + if (cpu_has_dsp) + status |= (ST0_MX); + + write_c0_status(status); + ehb(); +} + +/* + * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) + */ +int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + uint32_t cause = vcpu->arch.host_cp0_cause; + uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + /* Set a default exit reason */ + run->exit_reason = KVM_EXIT_UNKNOWN; + run->ready_for_interrupt_injection = 1; + + /* + * Set the appropriate status bits based on host CPU features, + * before we hit the scheduler + */ + kvm_mips_set_c0_status(); + + local_irq_enable(); + + kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n", + cause, opc, run, vcpu); + + /* + * Do a privilege check, if in UM most of these exit conditions end up + * causing an exception to be delivered to the Guest Kernel + */ + er = kvm_mips_check_privilege(cause, opc, run, vcpu); + if (er == EMULATE_PRIV_FAIL) { + goto skip_emul; + } else if (er == EMULATE_FAIL) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + goto skip_emul; + } + + switch (exccode) { + case T_INT: + kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc); + + ++vcpu->stat.int_exits; + trace_kvm_exit(vcpu, INT_EXITS); + + if (need_resched()) + cond_resched(); + + ret = RESUME_GUEST; + break; + + case T_COP_UNUSABLE: + kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc); + + ++vcpu->stat.cop_unusable_exits; + trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS); + ret = kvm_mips_callbacks->handle_cop_unusable(vcpu); + /* XXXKYMA: Might need to return to user space */ + if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) + ret = RESUME_HOST; + break; + + case T_TLB_MOD: + ++vcpu->stat.tlbmod_exits; + trace_kvm_exit(vcpu, TLBMOD_EXITS); + ret = kvm_mips_callbacks->handle_tlb_mod(vcpu); + break; + + case T_TLB_ST_MISS: + kvm_debug("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n", + cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc, + badvaddr); + + ++vcpu->stat.tlbmiss_st_exits; + trace_kvm_exit(vcpu, TLBMISS_ST_EXITS); + ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu); + break; + + case T_TLB_LD_MISS: + kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + + ++vcpu->stat.tlbmiss_ld_exits; + trace_kvm_exit(vcpu, TLBMISS_LD_EXITS); + ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu); + break; + + case T_ADDR_ERR_ST: + ++vcpu->stat.addrerr_st_exits; + trace_kvm_exit(vcpu, ADDRERR_ST_EXITS); + ret = kvm_mips_callbacks->handle_addr_err_st(vcpu); + break; + + case T_ADDR_ERR_LD: + ++vcpu->stat.addrerr_ld_exits; + trace_kvm_exit(vcpu, ADDRERR_LD_EXITS); + ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu); + break; + + case T_SYSCALL: + ++vcpu->stat.syscall_exits; + trace_kvm_exit(vcpu, SYSCALL_EXITS); + ret = kvm_mips_callbacks->handle_syscall(vcpu); + break; + + case T_RES_INST: + ++vcpu->stat.resvd_inst_exits; + trace_kvm_exit(vcpu, RESVD_INST_EXITS); + ret = kvm_mips_callbacks->handle_res_inst(vcpu); + break; + + case T_BREAK: + ++vcpu->stat.break_inst_exits; + trace_kvm_exit(vcpu, BREAK_INST_EXITS); + ret = kvm_mips_callbacks->handle_break(vcpu); + break; + + default: + kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n", + exccode, opc, kvm_get_inst(opc, vcpu), badvaddr, + kvm_read_c0_guest_status(vcpu->arch.cop0)); + kvm_arch_vcpu_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + break; + + } + +skip_emul: + local_irq_disable(); + + if (er == EMULATE_DONE && !(ret & RESUME_HOST)) + kvm_mips_deliver_interrupts(vcpu, cause); + + if (!(ret & RESUME_HOST)) { + /* Only check for signals if not already exiting to userspace */ + if (signal_pending(current)) { + run->exit_reason = KVM_EXIT_INTR; + ret = (-EINTR << 2) | RESUME_HOST; + ++vcpu->stat.signal_exits; + trace_kvm_exit(vcpu, SIGNAL_EXITS); + } + } + + return ret; +} + +int __init kvm_mips_init(void) +{ + int ret; + + ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); + + if (ret) + return ret; + + /* + * On MIPS, kernel modules are executed from "mapped space", which + * requires TLBs. The TLB handling code is statically linked with + * the rest of the kernel (tlb.c) to avoid the possibility of + * double faulting. The issue is that the TLB code references + * routines that are part of the the KVM module, which are only + * available once the module is loaded. + */ + kvm_mips_gfn_to_pfn = gfn_to_pfn; + kvm_mips_release_pfn_clean = kvm_release_pfn_clean; + kvm_mips_is_error_pfn = is_error_pfn; + + pr_info("KVM/MIPS Initialized\n"); + return 0; +} + +void __exit kvm_mips_exit(void) +{ + kvm_exit(); + + kvm_mips_gfn_to_pfn = NULL; + kvm_mips_release_pfn_clean = NULL; + kvm_mips_is_error_pfn = NULL; + + pr_info("KVM/MIPS unloaded\n"); +} + +module_init(kvm_mips_init); +module_exit(kvm_mips_exit); + +EXPORT_TRACEPOINT_SYMBOL(kvm_exit); diff --git a/arch/mips/kvm/opcode.h b/arch/mips/kvm/opcode.h new file mode 100644 index 000000000000..03a6ae84c7df --- /dev/null +++ b/arch/mips/kvm/opcode.h @@ -0,0 +1,22 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +/* Define opcode values not defined in */ + +#ifndef __KVM_MIPS_OPCODE_H__ +#define __KVM_MIPS_OPCODE_H__ + +/* COP0 Ops */ +#define mfmcz_op 0x0b /* 01011 */ +#define wrpgpr_op 0x0e /* 01110 */ + +/* COP0 opcodes (only if COP0 and CO=1): */ +#define wait_op 0x20 /* 100000 */ + +#endif /* __KVM_MIPS_OPCODE_H__ */ diff --git a/arch/mips/kvm/stats.c b/arch/mips/kvm/stats.c new file mode 100644 index 000000000000..a74d6024c5ad --- /dev/null +++ b/arch/mips/kvm/stats.c @@ -0,0 +1,80 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: COP0 access histogram + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include + +char *kvm_mips_exit_types_str[MAX_KVM_MIPS_EXIT_TYPES] = { + "WAIT", + "CACHE", + "Signal", + "Interrupt", + "COP0/1 Unusable", + "TLB Mod", + "TLB Miss (LD)", + "TLB Miss (ST)", + "Address Err (ST)", + "Address Error (LD)", + "System Call", + "Reserved Inst", + "Break Inst", + "D-Cache Flushes", +}; + +char *kvm_cop0_str[N_MIPS_COPROC_REGS] = { + "Index", + "Random", + "EntryLo0", + "EntryLo1", + "Context", + "PG Mask", + "Wired", + "HWREna", + "BadVAddr", + "Count", + "EntryHI", + "Compare", + "Status", + "Cause", + "EXC PC", + "PRID", + "Config", + "LLAddr", + "Watch Lo", + "Watch Hi", + "X Context", + "Reserved", + "Impl Dep", + "Debug", + "DEPC", + "PerfCnt", + "ErrCtl", + "CacheErr", + "TagLo", + "TagHi", + "ErrorEPC", + "DESAVE" +}; + +void kvm_mips_dump_stats(struct kvm_vcpu *vcpu) +{ +#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS + int i, j; + + kvm_info("\nKVM VCPU[%d] COP0 Access Profile:\n", vcpu->vcpu_id); + for (i = 0; i < N_MIPS_COPROC_REGS; i++) { + for (j = 0; j < N_MIPS_COPROC_SEL; j++) { + if (vcpu->arch.cop0->stat[i][j]) + kvm_info("%s[%d]: %lu\n", kvm_cop0_str[i], j, + vcpu->arch.cop0->stat[i][j]); + } + } +#endif +} diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c new file mode 100644 index 000000000000..bbcd82242059 --- /dev/null +++ b/arch/mips/kvm/tlb.c @@ -0,0 +1,809 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that + * TLB handlers run from KSEG0 + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#undef CONFIG_MIPS_MT +#include +#define CONFIG_MIPS_MT + +#define KVM_GUEST_PC_TLB 0 +#define KVM_GUEST_SP_TLB 1 + +#define PRIx64 "llx" + +atomic_t kvm_mips_instance; +EXPORT_SYMBOL(kvm_mips_instance); + +/* These function pointers are initialized once the KVM module is loaded */ +pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); +EXPORT_SYMBOL(kvm_mips_gfn_to_pfn); + +void (*kvm_mips_release_pfn_clean)(pfn_t pfn); +EXPORT_SYMBOL(kvm_mips_release_pfn_clean); + +bool (*kvm_mips_is_error_pfn)(pfn_t pfn); +EXPORT_SYMBOL(kvm_mips_is_error_pfn); + +uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK; +} + +uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK; +} + +inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) +{ + return vcpu->kvm->arch.commpage_tlb; +} + +/* Structure defining an tlb entry data set. */ + +void kvm_mips_dump_host_tlbs(void) +{ + unsigned long old_entryhi; + unsigned long old_pagemask; + struct kvm_mips_tlb tlb; + unsigned long flags; + int i; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + old_pagemask = read_c0_pagemask(); + + kvm_info("HOST TLBs:\n"); + kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); + + for (i = 0; i < current_cpu_data.tlbsize; i++) { + write_c0_index(i); + mtc0_tlbw_hazard(); + + tlb_read(); + tlbw_use_hazard(); + + tlb.tlb_hi = read_c0_entryhi(); + tlb.tlb_lo0 = read_c0_entrylo0(); + tlb.tlb_lo1 = read_c0_entrylo1(); + tlb.tlb_mask = read_c0_pagemask(); + + kvm_info("TLB%c%3d Hi 0x%08lx ", + (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', + i, tlb.tlb_hi); + kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), + (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo0 >> 3) & 7); + kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), + (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); + } + write_c0_entryhi(old_entryhi); + write_c0_pagemask(old_pagemask); + mtc0_tlbw_hazard(); + local_irq_restore(flags); +} +EXPORT_SYMBOL(kvm_mips_dump_host_tlbs); + +void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + struct kvm_mips_tlb tlb; + int i; + + kvm_info("Guest TLBs:\n"); + kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); + + for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { + tlb = vcpu->arch.guest_tlb[i]; + kvm_info("TLB%c%3d Hi 0x%08lx ", + (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', + i, tlb.tlb_hi); + kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), + (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo0 >> 3) & 7); + kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", + (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), + (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', + (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', + (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); + } +} +EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); + +static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) +{ + int srcu_idx, err = 0; + pfn_t pfn; + + if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE) + return 0; + + srcu_idx = srcu_read_lock(&kvm->srcu); + pfn = kvm_mips_gfn_to_pfn(kvm, gfn); + + if (kvm_mips_is_error_pfn(pfn)) { + kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn); + err = -EFAULT; + goto out; + } + + kvm->arch.guest_pmap[gfn] = pfn; +out: + srcu_read_unlock(&kvm->srcu, srcu_idx); + return err; +} + +/* Translate guest KSEG0 addresses to Host PA */ +unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, + unsigned long gva) +{ + gfn_t gfn; + uint32_t offset = gva & ~PAGE_MASK; + struct kvm *kvm = vcpu->kvm; + + if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) { + kvm_err("%s/%p: Invalid gva: %#lx\n", __func__, + __builtin_return_address(0), gva); + return KVM_INVALID_PAGE; + } + + gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT); + + if (gfn >= kvm->arch.guest_pmap_npages) { + kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn, + gva); + return KVM_INVALID_PAGE; + } + + if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) + return KVM_INVALID_ADDR; + + return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset; +} +EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa); + +/* XXXKYMA: Must be called with interrupts disabled */ +/* set flush_dcache_mask == 0 if no dcache flush required */ +int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, + unsigned long entrylo0, unsigned long entrylo1, + int flush_dcache_mask) +{ + unsigned long flags; + unsigned long old_entryhi; + int idx; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + write_c0_entryhi(entryhi); + mtc0_tlbw_hazard(); + + tlb_probe(); + tlb_probe_hazard(); + idx = read_c0_index(); + + if (idx > current_cpu_data.tlbsize) { + kvm_err("%s: Invalid Index: %d\n", __func__, idx); + kvm_mips_dump_host_tlbs(); + return -1; + } + + write_c0_entrylo0(entrylo0); + write_c0_entrylo1(entrylo1); + mtc0_tlbw_hazard(); + + if (idx < 0) + tlb_write_random(); + else + tlb_write_indexed(); + tlbw_use_hazard(); + + kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", + vcpu->arch.pc, idx, read_c0_entryhi(), + read_c0_entrylo0(), read_c0_entrylo1()); + + /* Flush D-cache */ + if (flush_dcache_mask) { + if (entrylo0 & MIPS3_PG_V) { + ++vcpu->stat.flush_dcache_exits; + flush_data_cache_page((entryhi & VPN2_MASK) & + ~flush_dcache_mask); + } + if (entrylo1 & MIPS3_PG_V) { + ++vcpu->stat.flush_dcache_exits; + flush_data_cache_page(((entryhi & VPN2_MASK) & + ~flush_dcache_mask) | + (0x1 << PAGE_SHIFT)); + } + } + + /* Restore old ASID */ + write_c0_entryhi(old_entryhi); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + local_irq_restore(flags); + return 0; +} + +/* XXXKYMA: Must be called with interrupts disabled */ +int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, + struct kvm_vcpu *vcpu) +{ + gfn_t gfn; + pfn_t pfn0, pfn1; + unsigned long vaddr = 0; + unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; + int even; + struct kvm *kvm = vcpu->kvm; + const int flush_dcache_mask = 0; + + if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) { + kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr); + kvm_mips_dump_host_tlbs(); + return -1; + } + + gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT); + if (gfn >= kvm->arch.guest_pmap_npages) { + kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__, + gfn, badvaddr); + kvm_mips_dump_host_tlbs(); + return -1; + } + even = !(gfn & 0x1); + vaddr = badvaddr & (PAGE_MASK << 1); + + if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) + return -1; + + if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0) + return -1; + + if (even) { + pfn0 = kvm->arch.guest_pmap[gfn]; + pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1]; + } else { + pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1]; + pfn1 = kvm->arch.guest_pmap[gfn]; + } + + entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu)); + entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); + entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); + + return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, + flush_dcache_mask); +} +EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault); + +int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, + struct kvm_vcpu *vcpu) +{ + pfn_t pfn0, pfn1; + unsigned long flags, old_entryhi = 0, vaddr = 0; + unsigned long entrylo0 = 0, entrylo1 = 0; + + pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; + pfn1 = 0; + entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | + (1 << 2) | (0x1 << 1); + entrylo1 = 0; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + vaddr = badvaddr & (PAGE_MASK << 1); + write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); + mtc0_tlbw_hazard(); + write_c0_entrylo0(entrylo0); + mtc0_tlbw_hazard(); + write_c0_entrylo1(entrylo1); + mtc0_tlbw_hazard(); + write_c0_index(kvm_mips_get_commpage_asid(vcpu)); + mtc0_tlbw_hazard(); + tlb_write_indexed(); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", + vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), + read_c0_entrylo0(), read_c0_entrylo1()); + + /* Restore old ASID */ + write_c0_entryhi(old_entryhi); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + local_irq_restore(flags); + + return 0; +} +EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault); + +int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, + struct kvm_mips_tlb *tlb, + unsigned long *hpa0, + unsigned long *hpa1) +{ + unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; + struct kvm *kvm = vcpu->kvm; + pfn_t pfn0, pfn1; + + if ((tlb->tlb_hi & VPN2_MASK) == 0) { + pfn0 = 0; + pfn1 = 0; + } else { + if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) + >> PAGE_SHIFT) < 0) + return -1; + + if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) + >> PAGE_SHIFT) < 0) + return -1; + + pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) + >> PAGE_SHIFT]; + pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) + >> PAGE_SHIFT]; + } + + if (hpa0) + *hpa0 = pfn0 << PAGE_SHIFT; + + if (hpa1) + *hpa1 = pfn1 << PAGE_SHIFT; + + /* Get attributes from the Guest TLB */ + entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ? + kvm_mips_get_kernel_asid(vcpu) : + kvm_mips_get_user_asid(vcpu)); + entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | + (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); + entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | + (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); + + kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc, + tlb->tlb_lo0, tlb->tlb_lo1); + + return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, + tlb->tlb_mask); +} +EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault); + +int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) +{ + int i; + int index = -1; + struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; + + for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { + if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && + TLB_HI_ASID_HIT(tlb[i], entryhi)) { + index = i; + break; + } + } + + kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", + __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); + + return index; +} +EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); + +int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) +{ + unsigned long old_entryhi, flags; + int idx; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + + if (KVM_GUEST_KERNEL_MODE(vcpu)) + write_c0_entryhi((vaddr & VPN2_MASK) | + kvm_mips_get_kernel_asid(vcpu)); + else { + write_c0_entryhi((vaddr & VPN2_MASK) | + kvm_mips_get_user_asid(vcpu)); + } + + mtc0_tlbw_hazard(); + + tlb_probe(); + tlb_probe_hazard(); + idx = read_c0_index(); + + /* Restore old ASID */ + write_c0_entryhi(old_entryhi); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + local_irq_restore(flags); + + kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); + + return idx; +} +EXPORT_SYMBOL(kvm_mips_host_tlb_lookup); + +int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) +{ + int idx; + unsigned long flags, old_entryhi; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + + write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); + mtc0_tlbw_hazard(); + + tlb_probe(); + tlb_probe_hazard(); + idx = read_c0_index(); + + if (idx >= current_cpu_data.tlbsize) + BUG(); + + if (idx > 0) { + write_c0_entryhi(UNIQUE_ENTRYHI(idx)); + mtc0_tlbw_hazard(); + + write_c0_entrylo0(0); + mtc0_tlbw_hazard(); + + write_c0_entrylo1(0); + mtc0_tlbw_hazard(); + + tlb_write_indexed(); + mtc0_tlbw_hazard(); + } + + write_c0_entryhi(old_entryhi); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + local_irq_restore(flags); + + if (idx > 0) + kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, + (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); + + return 0; +} +EXPORT_SYMBOL(kvm_mips_host_tlb_inv); + +/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */ +int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index) +{ + unsigned long flags, old_entryhi; + + if (index >= current_cpu_data.tlbsize) + BUG(); + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + + write_c0_entryhi(UNIQUE_ENTRYHI(index)); + mtc0_tlbw_hazard(); + + write_c0_index(index); + mtc0_tlbw_hazard(); + + write_c0_entrylo0(0); + mtc0_tlbw_hazard(); + + write_c0_entrylo1(0); + mtc0_tlbw_hazard(); + + tlb_write_indexed(); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + write_c0_entryhi(old_entryhi); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + local_irq_restore(flags); + + return 0; +} + +void kvm_mips_flush_host_tlb(int skip_kseg0) +{ + unsigned long flags; + unsigned long old_entryhi, entryhi; + unsigned long old_pagemask; + int entry = 0; + int maxentry = current_cpu_data.tlbsize; + + local_irq_save(flags); + + old_entryhi = read_c0_entryhi(); + old_pagemask = read_c0_pagemask(); + + /* Blast 'em all away. */ + for (entry = 0; entry < maxentry; entry++) { + write_c0_index(entry); + mtc0_tlbw_hazard(); + + if (skip_kseg0) { + tlb_read(); + tlbw_use_hazard(); + + entryhi = read_c0_entryhi(); + + /* Don't blow away guest kernel entries */ + if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) + continue; + } + + /* Make sure all entries differ. */ + write_c0_entryhi(UNIQUE_ENTRYHI(entry)); + mtc0_tlbw_hazard(); + write_c0_entrylo0(0); + mtc0_tlbw_hazard(); + write_c0_entrylo1(0); + mtc0_tlbw_hazard(); + + tlb_write_indexed(); + mtc0_tlbw_hazard(); + } + + tlbw_use_hazard(); + + write_c0_entryhi(old_entryhi); + write_c0_pagemask(old_pagemask); + mtc0_tlbw_hazard(); + tlbw_use_hazard(); + + local_irq_restore(flags); +} +EXPORT_SYMBOL(kvm_mips_flush_host_tlb); + +void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, + struct kvm_vcpu *vcpu) +{ + unsigned long asid = asid_cache(cpu); + + asid += ASID_INC; + if (!(asid & ASID_MASK)) { + if (cpu_has_vtag_icache) + flush_icache_all(); + + kvm_local_flush_tlb_all(); /* start new asid cycle */ + + if (!asid) /* fix version if needed */ + asid = ASID_FIRST_VERSION; + } + + cpu_context(cpu, mm) = asid_cache(cpu) = asid; +} + +void kvm_local_flush_tlb_all(void) +{ + unsigned long flags; + unsigned long old_ctx; + int entry = 0; + + local_irq_save(flags); + /* Save old context and create impossible VPN2 value */ + old_ctx = read_c0_entryhi(); + write_c0_entrylo0(0); + write_c0_entrylo1(0); + + /* Blast 'em all away. */ + while (entry < current_cpu_data.tlbsize) { + /* Make sure all entries differ. */ + write_c0_entryhi(UNIQUE_ENTRYHI(entry)); + write_c0_index(entry); + mtc0_tlbw_hazard(); + tlb_write_indexed(); + entry++; + } + tlbw_use_hazard(); + write_c0_entryhi(old_ctx); + mtc0_tlbw_hazard(); + + local_irq_restore(flags); +} +EXPORT_SYMBOL(kvm_local_flush_tlb_all); + +/** + * kvm_mips_migrate_count() - Migrate timer. + * @vcpu: Virtual CPU. + * + * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it + * if it was running prior to being cancelled. + * + * Must be called when the VCPU is migrated to a different CPU to ensure that + * timer expiry during guest execution interrupts the guest and causes the + * interrupt to be delivered in a timely manner. + */ +static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) +{ + if (hrtimer_cancel(&vcpu->arch.comparecount_timer)) + hrtimer_restart(&vcpu->arch.comparecount_timer); +} + +/* Restore ASID once we are scheduled back after preemption */ +void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + unsigned long flags; + int newasid = 0; + + kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); + + /* Alocate new kernel and user ASIDs if needed */ + + local_irq_save(flags); + + if (((vcpu->arch. + guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) { + kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); + vcpu->arch.guest_kernel_asid[cpu] = + vcpu->arch.guest_kernel_mm.context.asid[cpu]; + kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); + vcpu->arch.guest_user_asid[cpu] = + vcpu->arch.guest_user_mm.context.asid[cpu]; + newasid++; + + kvm_debug("[%d]: cpu_context: %#lx\n", cpu, + cpu_context(cpu, current->mm)); + kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", + cpu, vcpu->arch.guest_kernel_asid[cpu]); + kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, + vcpu->arch.guest_user_asid[cpu]); + } + + if (vcpu->arch.last_sched_cpu != cpu) { + kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", + vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); + /* + * Migrate the timer interrupt to the current CPU so that it + * always interrupts the guest and synchronously triggers a + * guest timer interrupt. + */ + kvm_mips_migrate_count(vcpu); + } + + if (!newasid) { + /* + * If we preempted while the guest was executing, then reload + * the pre-empted ASID + */ + if (current->flags & PF_VCPU) { + write_c0_entryhi(vcpu->arch. + preempt_entryhi & ASID_MASK); + ehb(); + } + } else { + /* New ASIDs were allocated for the VM */ + + /* + * Were we in guest context? If so then the pre-empted ASID is + * no longer valid, we need to set it to what it should be based + * on the mode of the Guest (Kernel/User) + */ + if (current->flags & PF_VCPU) { + if (KVM_GUEST_KERNEL_MODE(vcpu)) + write_c0_entryhi(vcpu->arch. + guest_kernel_asid[cpu] & + ASID_MASK); + else + write_c0_entryhi(vcpu->arch. + guest_user_asid[cpu] & + ASID_MASK); + ehb(); + } + } + + local_irq_restore(flags); + +} +EXPORT_SYMBOL(kvm_arch_vcpu_load); + +/* ASID can change if another task is scheduled during preemption */ +void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) +{ + unsigned long flags; + uint32_t cpu; + + local_irq_save(flags); + + cpu = smp_processor_id(); + + vcpu->arch.preempt_entryhi = read_c0_entryhi(); + vcpu->arch.last_sched_cpu = cpu; + + if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & + ASID_VERSION_MASK)) { + kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, + cpu_context(cpu, current->mm)); + drop_mmu_context(current->mm, cpu); + } + write_c0_entryhi(cpu_asid(cpu, current->mm)); + ehb(); + + local_irq_restore(flags); +} +EXPORT_SYMBOL(kvm_arch_vcpu_put); + +uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned long paddr, flags, vpn2, asid; + uint32_t inst; + int index; + + if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 || + KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { + local_irq_save(flags); + index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc); + if (index >= 0) { + inst = *(opc); + } else { + vpn2 = (unsigned long) opc & VPN2_MASK; + asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK; + index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid); + if (index < 0) { + kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", + __func__, opc, vcpu, read_c0_entryhi()); + kvm_mips_dump_host_tlbs(); + local_irq_restore(flags); + return KVM_INVALID_INST; + } + kvm_mips_handle_mapped_seg_tlb_fault(vcpu, + &vcpu->arch. + guest_tlb[index], + NULL, NULL); + inst = *(opc); + } + local_irq_restore(flags); + } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { + paddr = + kvm_mips_translate_guest_kseg0_to_hpa(vcpu, + (unsigned long) opc); + inst = *(uint32_t *) CKSEG0ADDR(paddr); + } else { + kvm_err("%s: illegal address: %p\n", __func__, opc); + return KVM_INVALID_INST; + } + + return inst; +} +EXPORT_SYMBOL(kvm_get_inst); diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c new file mode 100644 index 000000000000..fd7257b70e65 --- /dev/null +++ b/arch/mips/kvm/trap_emul.c @@ -0,0 +1,492 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Deliver/Emulate exceptions to the guest kernel + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Sanjay Lal + */ + +#include +#include +#include +#include + +#include + +#include "opcode.h" +#include "interrupt.h" + +static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva) +{ + gpa_t gpa; + uint32_t kseg = KSEGX(gva); + + if ((kseg == CKSEG0) || (kseg == CKSEG1)) + gpa = CPHYSADDR(gva); + else { + kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva); + kvm_mips_dump_host_tlbs(); + gpa = KVM_INVALID_ADDR; + } + + kvm_debug("%s: gva %#lx, gpa: %#llx\n", __func__, gva, gpa); + + return gpa; +} + +static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) + er = kvm_mips_emulate_fpu_exc(cause, opc, run, vcpu); + else + er = kvm_mips_emulate_inst(cause, opc, run, vcpu); + + switch (er) { + case EMULATE_DONE: + ret = RESUME_GUEST; + break; + + case EMULATE_FAIL: + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + break; + + case EMULATE_WAIT: + run->exit_reason = KVM_EXIT_INTR; + ret = RESUME_HOST; + break; + + default: + BUG(); + } + return ret; +} + +static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 + || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { + kvm_debug("USER/KSEG23 ADDR TLB MOD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + er = kvm_mips_handle_tlbmod(cause, opc, run, vcpu); + + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { + /* + * XXXKYMA: The guest kernel does not expect to get this fault + * when we are not using HIGHMEM. Need to address this in a + * HIGHMEM kernel + */ + kvm_err("TLB MOD fault not handled, cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + kvm_mips_dump_host_tlbs(); + kvm_arch_vcpu_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } else { + kvm_err("Illegal TLB Mod fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + kvm_mips_dump_host_tlbs(); + kvm_arch_vcpu_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) + && KVM_GUEST_KERNEL_MODE(vcpu)) { + if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 + || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { + kvm_debug("USER ADDR TLB LD fault: cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { + /* + * All KSEG0 faults are handled by KVM, as the guest kernel does + * not expect to ever get them + */ + if (kvm_mips_handle_kseg0_tlb_fault + (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else { + kvm_err("Illegal TLB LD fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + kvm_mips_dump_host_tlbs(); + kvm_arch_vcpu_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) + && KVM_GUEST_KERNEL_MODE(vcpu)) { + if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0 + || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) { + kvm_debug("USER ADDR TLB ST fault: PC: %#lx, BadVaddr: %#lx\n", + vcpu->arch.pc, badvaddr); + + /* + * User Address (UA) fault, this could happen if + * (1) TLB entry not present/valid in both Guest and shadow host + * TLBs, in this case we pass on the fault to the guest + * kernel and let it handle it. + * (2) TLB entry is present in the Guest TLB but not in the + * shadow, in this case we inject the TLB from the Guest TLB + * into the shadow host TLB + */ + + er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu); + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) { + if (kvm_mips_handle_kseg0_tlb_fault + (vcpu->arch.host_cp0_badvaddr, vcpu) < 0) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + } else { + kvm_err("Illegal TLB ST fault address , cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + kvm_mips_dump_host_tlbs(); + kvm_arch_vcpu_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (KVM_GUEST_KERNEL_MODE(vcpu) + && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) { + kvm_debug("Emulate Store to MMIO space\n"); + er = kvm_mips_emulate_inst(cause, opc, run, vcpu); + if (er == EMULATE_FAIL) { + kvm_err("Emulate Store to MMIO space failed\n"); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } else { + run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } + } else { + kvm_err("Address Error (STORE): cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + if (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1) { + kvm_debug("Emulate Load from MMIO space @ %#lx\n", badvaddr); + er = kvm_mips_emulate_inst(cause, opc, run, vcpu); + if (er == EMULATE_FAIL) { + kvm_err("Emulate Load from MMIO space failed\n"); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } else { + run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } + } else { + kvm_err("Address Error (LOAD): cause %#lx, PC: %p, BadVaddr: %#lx\n", + cause, opc, badvaddr); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + er = EMULATE_FAIL; + } + return ret; +} + +static int kvm_trap_emul_handle_syscall(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + er = kvm_mips_emulate_syscall(cause, opc, run, vcpu); + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_res_inst(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + er = kvm_mips_handle_ri(cause, opc, run, vcpu); + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_handle_break(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc; + unsigned long cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + er = kvm_mips_emulate_bp_exc(cause, opc, run, vcpu); + if (er == EMULATE_DONE) + ret = RESUME_GUEST; + else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_emul_vm_init(struct kvm *kvm) +{ + return 0; +} + +static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu) +{ + return 0; +} + +static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + uint32_t config1; + int vcpu_id = vcpu->vcpu_id; + + /* + * Arch specific stuff, set up config registers properly so that the + * guest will come up as expected, for now we simulate a MIPS 24kc + */ + kvm_write_c0_guest_prid(cop0, 0x00019300); + kvm_write_c0_guest_config(cop0, + MIPS_CONFIG0 | (0x1 << CP0C0_AR) | + (MMU_TYPE_R4000 << CP0C0_MT)); + + /* Read the cache characteristics from the host Config1 Register */ + config1 = (read_c0_config1() & ~0x7f); + + /* Set up MMU size */ + config1 &= ~(0x3f << 25); + config1 |= ((KVM_MIPS_GUEST_TLB_SIZE - 1) << 25); + + /* We unset some bits that we aren't emulating */ + config1 &= + ~((1 << CP0C1_C2) | (1 << CP0C1_MD) | (1 << CP0C1_PC) | + (1 << CP0C1_WR) | (1 << CP0C1_CA)); + kvm_write_c0_guest_config1(cop0, config1); + + kvm_write_c0_guest_config2(cop0, MIPS_CONFIG2); + /* MIPS_CONFIG2 | (read_c0_config2() & 0xfff) */ + kvm_write_c0_guest_config3(cop0, MIPS_CONFIG3 | (0 << CP0C3_VInt) | + (1 << CP0C3_ULRI)); + + /* Set Wait IE/IXMT Ignore in Config7, IAR, AR */ + kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10)); + + /* + * Setup IntCtl defaults, compatibilty mode for timer interrupts (HW5) + */ + kvm_write_c0_guest_intctl(cop0, 0xFC000000); + + /* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */ + kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 | (vcpu_id & 0xFF)); + + return 0; +} + +static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, + s64 *v) +{ + switch (reg->id) { + case KVM_REG_MIPS_CP0_COUNT: + *v = kvm_mips_read_count(vcpu); + break; + case KVM_REG_MIPS_COUNT_CTL: + *v = vcpu->arch.count_ctl; + break; + case KVM_REG_MIPS_COUNT_RESUME: + *v = ktime_to_ns(vcpu->arch.count_resume); + break; + case KVM_REG_MIPS_COUNT_HZ: + *v = vcpu->arch.count_hz; + break; + default: + return -EINVAL; + } + return 0; +} + +static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, + s64 v) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + int ret = 0; + + switch (reg->id) { + case KVM_REG_MIPS_CP0_COUNT: + kvm_mips_write_count(vcpu, v); + break; + case KVM_REG_MIPS_CP0_COMPARE: + kvm_mips_write_compare(vcpu, v); + break; + case KVM_REG_MIPS_CP0_CAUSE: + /* + * If the timer is stopped or started (DC bit) it must look + * atomic with changes to the interrupt pending bits (TI, IRQ5). + * A timer interrupt should not happen in between. + */ + if ((kvm_read_c0_guest_cause(cop0) ^ v) & CAUSEF_DC) { + if (v & CAUSEF_DC) { + /* disable timer first */ + kvm_mips_count_disable_cause(vcpu); + kvm_change_c0_guest_cause(cop0, ~CAUSEF_DC, v); + } else { + /* enable timer last */ + kvm_change_c0_guest_cause(cop0, ~CAUSEF_DC, v); + kvm_mips_count_enable_cause(vcpu); + } + } else { + kvm_write_c0_guest_cause(cop0, v); + } + break; + case KVM_REG_MIPS_COUNT_CTL: + ret = kvm_mips_set_count_ctl(vcpu, v); + break; + case KVM_REG_MIPS_COUNT_RESUME: + ret = kvm_mips_set_count_resume(vcpu, v); + break; + case KVM_REG_MIPS_COUNT_HZ: + ret = kvm_mips_set_count_hz(vcpu, v); + break; + default: + return -EINVAL; + } + return ret; +} + +static struct kvm_mips_callbacks kvm_trap_emul_callbacks = { + /* exit handlers */ + .handle_cop_unusable = kvm_trap_emul_handle_cop_unusable, + .handle_tlb_mod = kvm_trap_emul_handle_tlb_mod, + .handle_tlb_st_miss = kvm_trap_emul_handle_tlb_st_miss, + .handle_tlb_ld_miss = kvm_trap_emul_handle_tlb_ld_miss, + .handle_addr_err_st = kvm_trap_emul_handle_addr_err_st, + .handle_addr_err_ld = kvm_trap_emul_handle_addr_err_ld, + .handle_syscall = kvm_trap_emul_handle_syscall, + .handle_res_inst = kvm_trap_emul_handle_res_inst, + .handle_break = kvm_trap_emul_handle_break, + + .vm_init = kvm_trap_emul_vm_init, + .vcpu_init = kvm_trap_emul_vcpu_init, + .vcpu_setup = kvm_trap_emul_vcpu_setup, + .gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb, + .queue_timer_int = kvm_mips_queue_timer_int_cb, + .dequeue_timer_int = kvm_mips_dequeue_timer_int_cb, + .queue_io_int = kvm_mips_queue_io_int_cb, + .dequeue_io_int = kvm_mips_dequeue_io_int_cb, + .irq_deliver = kvm_mips_irq_deliver_cb, + .irq_clear = kvm_mips_irq_clear_cb, + .get_one_reg = kvm_trap_emul_get_one_reg, + .set_one_reg = kvm_trap_emul_set_one_reg, +}; + +int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) +{ + *install_callbacks = &kvm_trap_emul_callbacks; + return 0; +} -- cgit v1.2.2 From db2fb7f202ba1d1b2c6532b359b7c763bf17fe72 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:39 -0700 Subject: MIPS: KVM: Skip memory cleaning in kvm_mips_commpage_init() The commpage is allocated using kzalloc(), so there's no need of cleaning the memory of the kvm_mips_commpage struct and its internal mips_coproc. Reviewed-by: James Hogan Signed-off-by: Deng-Cheng Zhu Signed-off-by: Paolo Bonzini --- arch/mips/kvm/commpage.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/commpage.c b/arch/mips/kvm/commpage.c index 61b9c043ea09..2d6e976d1add 100644 --- a/arch/mips/kvm/commpage.c +++ b/arch/mips/kvm/commpage.c @@ -28,9 +28,6 @@ void kvm_mips_commpage_init(struct kvm_vcpu *vcpu) { struct kvm_mips_commpage *page = vcpu->arch.kseg0_commpage; - memset(page, 0, sizeof(struct kvm_mips_commpage)); - /* Specific init values for fields */ vcpu->arch.cop0 = &page->cop0; - memset(vcpu->arch.cop0, 0, sizeof(struct mips_coproc)); } -- cgit v1.2.2 From ab76228a48d434d67cf72f8753307db104e81cc6 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Thu, 26 Jun 2014 12:11:40 -0700 Subject: MIPS: KVM: Remove dead code of TLB index error in kvm_mips_emul_tlbwr() It's impossible to fall into the error handling of the TLB index after being masked by (KVM_MIPS_GUEST_TLB_SIZE - 1). Remove the dead code. Reported-by: James Hogan Signed-off-by: Deng-Cheng Zhu Reviewed-by: James Hogan Signed-off-by: Paolo Bonzini --- arch/mips/kvm/emulate.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'arch/mips/kvm') diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index 1a6068892e66..fb3e8dfd1ff6 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -846,11 +846,6 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) get_random_bytes(&index, sizeof(index)); index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); - if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { - kvm_err("%s: illegal index: %d\n", __func__, index); - return EMULATE_FAIL; - } - tlb = &vcpu->arch.guest_tlb[index]; /* -- cgit v1.2.2