1 files changed, 1169 insertions, 0 deletions

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
new file mode 100644
index 000000000000..5a936988eb24
--- /dev/null
+++ b/arch/arm/kvm/arm.c
@@ -0,0 +1,1169 @@
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/kvm.h>
+#include <trace/events/kvm.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+#include <asm/unified.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/mman.h>
+#include <asm/cputype.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/virt.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_coproc.h>
+#include <asm/kvm_psci.h>
+#include <asm/opcodes.h>
+
+#ifdef REQUIRES_VIRT
+__asm__(".arch_extension        virt");
+#endif
+
+static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
+static struct vfp_hard_struct __percpu *kvm_host_vfp_state;
+static unsigned long hyp_default_vectors;
+
+/* Per-CPU variable containing the currently running vcpu. */
+static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
+
+/* The VMID used in the VTTBR */
+static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
+static u8 kvm_next_vmid;
+static DEFINE_SPINLOCK(kvm_vmid_lock);
+
+static bool vgic_present;
+
+static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
+{
+        BUG_ON(preemptible());
+        __get_cpu_var(kvm_arm_running_vcpu) = vcpu;
+}
+
+/**
+ * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
+ * Must be called from non-preemptible context
+ */
+struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
+{
+        BUG_ON(preemptible());
+        return __get_cpu_var(kvm_arm_running_vcpu);
+}
+
+/**
+ * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
+ */
+struct kvm_vcpu __percpu **kvm_get_running_vcpus(void)
+{
+        return &kvm_arm_running_vcpu;
+}
+
+int kvm_arch_hardware_enable(void *garbage)
+{
+        return 0;
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+        return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+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;
+}
+
+void kvm_arch_sync_events(struct kvm *kvm)
+{
+}
+
+/**
+ * kvm_arch_init_vm - initializes a VM data structure
+ * @kvm:        pointer to the KVM struct
+ */
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+        int ret = 0;
+
+        if (type)
+                return -EINVAL;
+
+        ret = kvm_alloc_stage2_pgd(kvm);
+        if (ret)
+                goto out_fail_alloc;
+
+        ret = create_hyp_mappings(kvm, kvm + 1);
+        if (ret)
+                goto out_free_stage2_pgd;
+
+        /* Mark the initial VMID generation invalid */
+        kvm->arch.vmid_gen = 0;
+
+        return ret;
+out_free_stage2_pgd:
+        kvm_free_stage2_pgd(kvm);
+out_fail_alloc:
+        return ret;
+}
+
+int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+        return VM_FAULT_SIGBUS;
+}
+
+void kvm_arch_free_memslot(struct kvm_memory_slot *free,
+                           struct kvm_memory_slot *dont)
+{
+}
+
+int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
+{
+        return 0;
+}
+
+/**
+ * kvm_arch_destroy_vm - destroy the VM data structure
+ * @kvm:        pointer to the KVM struct
+ */
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+        int i;
+
+        kvm_free_stage2_pgd(kvm);
+
+        for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+                if (kvm->vcpus[i]) {
+                        kvm_arch_vcpu_free(kvm->vcpus[i]);
+                        kvm->vcpus[i] = NULL;
+                }
+        }
+}
+
+int kvm_dev_ioctl_check_extension(long ext)
+{
+        int r;
+        switch (ext) {
+        case KVM_CAP_IRQCHIP:
+                r = vgic_present;
+                break;
+        case KVM_CAP_USER_MEMORY:
+        case KVM_CAP_SYNC_MMU:
+        case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+        case KVM_CAP_ONE_REG:
+        case KVM_CAP_ARM_PSCI:
+                r = 1;
+                break;
+        case KVM_CAP_COALESCED_MMIO:
+                r = KVM_COALESCED_MMIO_PAGE_OFFSET;
+                break;
+        case KVM_CAP_ARM_SET_DEVICE_ADDR:
+                r = 1;
+        case KVM_CAP_NR_VCPUS:
+                r = num_online_cpus();
+                break;
+        case KVM_CAP_MAX_VCPUS:
+                r = KVM_MAX_VCPUS;
+                break;
+        default:
+                r = 0;
+                break;
+        }
+        return r;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+                        unsigned int ioctl, unsigned long arg)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_set_memory_region(struct kvm *kvm,
+                               struct kvm_userspace_memory_region *mem,
+                               struct kvm_memory_slot old,
+                               int user_alloc)
+{
+        return 0;
+}
+
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+                                   struct kvm_memory_slot *memslot,
+                                   struct kvm_memory_slot old,
+                                   struct kvm_userspace_memory_region *mem,
+                                   bool user_alloc)
+{
+        return 0;
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+                                   struct kvm_userspace_memory_region *mem,
+                                   struct kvm_memory_slot old,
+                                   bool user_alloc)
+{
+}
+
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
+{
+}
+
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                   struct kvm_memory_slot *slot)
+{
+}
+
+struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+{
+        int err;
+        struct kvm_vcpu *vcpu;
+
+        vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+        if (!vcpu) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        err = kvm_vcpu_init(vcpu, kvm, id);
+        if (err)
+                goto free_vcpu;
+
+        err = create_hyp_mappings(vcpu, vcpu + 1);
+        if (err)
+                goto vcpu_uninit;
+
+        return vcpu;
+vcpu_uninit:
+        kvm_vcpu_uninit(vcpu);
+free_vcpu:
+        kmem_cache_free(kvm_vcpu_cache, vcpu);
+out:
+        return ERR_PTR(err);
+}
+
+int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+        return 0;
+}
+
+void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+{
+        kvm_mmu_free_memory_caches(vcpu);
+        kvm_timer_vcpu_terminate(vcpu);
+        kmem_cache_free(kvm_vcpu_cache, vcpu);
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+        kvm_arch_vcpu_free(vcpu);
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+        return 0;
+}
+
+int __attribute_const__ kvm_target_cpu(void)
+{
+        unsigned long implementor = read_cpuid_implementor();
+        unsigned long part_number = read_cpuid_part_number();
+
+        if (implementor != ARM_CPU_IMP_ARM)
+                return -EINVAL;
+
+        switch (part_number) {
+        case ARM_CPU_PART_CORTEX_A15:
+                return KVM_ARM_TARGET_CORTEX_A15;
+        default:
+                return -EINVAL;
+        }
+}
+
+int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+        int ret;
+
+        /* Force users to call KVM_ARM_VCPU_INIT */
+        vcpu->arch.target = -1;
+
+        /* Set up VGIC */
+        ret = kvm_vgic_vcpu_init(vcpu);
+        if (ret)
+                return ret;
+
+        /* Set up the timer */
+        kvm_timer_vcpu_init(vcpu);
+
+        return 0;
+}
+
+void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+        vcpu->cpu = cpu;
+        vcpu->arch.vfp_host = this_cpu_ptr(kvm_host_vfp_state);
+
+        /*
+         * Check whether this vcpu requires the cache to be flushed on
+         * this physical CPU. This is a consequence of doing dcache
+         * operations by set/way on this vcpu. We do it here to be in
+         * a non-preemptible section.
+         */
+        if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
+                flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
+
+        kvm_arm_set_running_vcpu(vcpu);
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+        kvm_arm_set_running_vcpu(NULL);
+}
+
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+                                        struct kvm_guest_debug *dbg)
+{
+        return -EINVAL;
+}
+
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+                                    struct kvm_mp_state *mp_state)
+{
+        return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+                                    struct kvm_mp_state *mp_state)
+{
+        return -EINVAL;
+}
+
+/**
+ * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
+ * @v:          The VCPU pointer
+ *
+ * If the guest CPU is not waiting for interrupts or an interrupt line is
+ * asserted, the CPU is by definition runnable.
+ */
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
+{
+        return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
+}
+
+/* Just ensure a guest exit from a particular CPU */
+static void exit_vm_noop(void *info)
+{
+}
+
+void force_vm_exit(const cpumask_t *mask)
+{
+        smp_call_function_many(mask, exit_vm_noop, NULL, true);
+}
+
+/**
+ * need_new_vmid_gen - check that the VMID is still valid
+ * @kvm: The VM's VMID to checkt
+ *
+ * return true if there is a new generation of VMIDs being used
+ *
+ * The hardware supports only 256 values with the value zero reserved for the
+ * host, so we check if an assigned value belongs to a previous generation,
+ * which which requires us to assign a new value. If we're the first to use a
+ * VMID for the new generation, we must flush necessary caches and TLBs on all
+ * CPUs.
+ */
+static bool need_new_vmid_gen(struct kvm *kvm)
+{
+        return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
+}
+
+/**
+ * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
+ * @kvm The guest that we are about to run
+ *
+ * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
+ * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
+ * caches and TLBs.
+ */
+static void update_vttbr(struct kvm *kvm)
+{
+        phys_addr_t pgd_phys;
+        u64 vmid;
+
+        if (!need_new_vmid_gen(kvm))
+                return;
+
+        spin_lock(&kvm_vmid_lock);
+
+        /*
+         * We need to re-check the vmid_gen here to ensure that if another vcpu
+         * already allocated a valid vmid for this vm, then this vcpu should
+         * use the same vmid.
+         */
+        if (!need_new_vmid_gen(kvm)) {
+                spin_unlock(&kvm_vmid_lock);
+                return;
+        }
+
+        /* First user of a new VMID generation? */
+        if (unlikely(kvm_next_vmid == 0)) {
+                atomic64_inc(&kvm_vmid_gen);
+                kvm_next_vmid = 1;
+
+                /*
+                 * On SMP we know no other CPUs can use this CPU's or each
+                 * other's VMID after force_vm_exit returns since the
+                 * kvm_vmid_lock blocks them from reentry to the guest.
+                 */
+                force_vm_exit(cpu_all_mask);
+                /*
+                 * Now broadcast TLB + ICACHE invalidation over the inner
+                 * shareable domain to make sure all data structures are
+                 * clean.
+                 */
+                kvm_call_hyp(__kvm_flush_vm_context);
+        }
+
+        kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
+        kvm->arch.vmid = kvm_next_vmid;
+        kvm_next_vmid++;
+
+        /* update vttbr to be used with the new vmid */
+        pgd_phys = virt_to_phys(kvm->arch.pgd);
+        vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
+        kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
+        kvm->arch.vttbr |= vmid;
+
+        spin_unlock(&kvm_vmid_lock);
+}
+
+static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        /* SVC called from Hyp mode should never get here */
+        kvm_debug("SVC called from Hyp mode shouldn't go here\n");
+        BUG();
+        return -EINVAL; /* Squash warning */
+}
+
+static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
+                      vcpu->arch.hsr & HSR_HVC_IMM_MASK);
+
+        if (kvm_psci_call(vcpu))
+                return 1;
+
+        kvm_inject_undefined(vcpu);
+        return 1;
+}
+
+static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        if (kvm_psci_call(vcpu))
+                return 1;
+
+        kvm_inject_undefined(vcpu);
+        return 1;
+}
+
+static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        /* The hypervisor should never cause aborts */
+        kvm_err("Prefetch Abort taken from Hyp mode at %#08x (HSR: %#08x)\n",
+                vcpu->arch.hxfar, vcpu->arch.hsr);
+        return -EFAULT;
+}
+
+static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        /* This is either an error in the ws. code or an external abort */
+        kvm_err("Data Abort taken from Hyp mode at %#08x (HSR: %#08x)\n",
+                vcpu->arch.hxfar, vcpu->arch.hsr);
+        return -EFAULT;
+}
+
+typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
+static exit_handle_fn arm_exit_handlers[] = {
+        [HSR_EC_WFI]            = kvm_handle_wfi,
+        [HSR_EC_CP15_32]        = kvm_handle_cp15_32,
+        [HSR_EC_CP15_64]        = kvm_handle_cp15_64,
+        [HSR_EC_CP14_MR]        = kvm_handle_cp14_access,
+        [HSR_EC_CP14_LS]        = kvm_handle_cp14_load_store,
+        [HSR_EC_CP14_64]        = kvm_handle_cp14_access,
+        [HSR_EC_CP_0_13]        = kvm_handle_cp_0_13_access,
+        [HSR_EC_CP10_ID]        = kvm_handle_cp10_id,
+        [HSR_EC_SVC_HYP]        = handle_svc_hyp,
+        [HSR_EC_HVC]            = handle_hvc,
+        [HSR_EC_SMC]            = handle_smc,
+        [HSR_EC_IABT]           = kvm_handle_guest_abort,
+        [HSR_EC_IABT_HYP]       = handle_pabt_hyp,
+        [HSR_EC_DABT]           = kvm_handle_guest_abort,
+        [HSR_EC_DABT_HYP]       = handle_dabt_hyp,
+};
+
+/*
+ * A conditional instruction is allowed to trap, even though it
+ * wouldn't be executed.  So let's re-implement the hardware, in
+ * software!
+ */
+static bool kvm_condition_valid(struct kvm_vcpu *vcpu)
+{
+        unsigned long cpsr, cond, insn;
+
+        /*
+         * Exception Code 0 can only happen if we set HCR.TGE to 1, to
+         * catch undefined instructions, and then we won't get past
+         * the arm_exit_handlers test anyway.
+         */
+        BUG_ON(((vcpu->arch.hsr & HSR_EC) >> HSR_EC_SHIFT) == 0);
+
+        /* Top two bits non-zero?  Unconditional. */
+        if (vcpu->arch.hsr >> 30)
+                return true;
+
+        cpsr = *vcpu_cpsr(vcpu);
+
+        /* Is condition field valid? */
+        if ((vcpu->arch.hsr & HSR_CV) >> HSR_CV_SHIFT)
+                cond = (vcpu->arch.hsr & HSR_COND) >> HSR_COND_SHIFT;
+        else {
+                /* This can happen in Thumb mode: examine IT state. */
+                unsigned long it;
+
+                it = ((cpsr >> 8) & 0xFC) | ((cpsr >> 25) & 0x3);
+
+                /* it == 0 => unconditional. */
+                if (it == 0)
+                        return true;
+
+                /* The cond for this insn works out as the top 4 bits. */
+                cond = (it >> 4);
+        }
+
+        /* Shift makes it look like an ARM-mode instruction */
+        insn = cond << 28;
+        return arm_check_condition(insn, cpsr) != ARM_OPCODE_CONDTEST_FAIL;
+}
+
+/*
+ * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
+ * proper exit to QEMU.
+ */
+static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
+                       int exception_index)
+{
+        unsigned long hsr_ec;
+
+        switch (exception_index) {
+        case ARM_EXCEPTION_IRQ:
+                return 1;
+        case ARM_EXCEPTION_UNDEFINED:
+                kvm_err("Undefined exception in Hyp mode at: %#08x\n",
+                        vcpu->arch.hyp_pc);
+                BUG();
+                panic("KVM: Hypervisor undefined exception!\n");
+        case ARM_EXCEPTION_DATA_ABORT:
+        case ARM_EXCEPTION_PREF_ABORT:
+        case ARM_EXCEPTION_HVC:
+                hsr_ec = (vcpu->arch.hsr & HSR_EC) >> HSR_EC_SHIFT;
+
+                if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers)
+                    || !arm_exit_handlers[hsr_ec]) {
+                        kvm_err("Unkown exception class: %#08lx, "
+                                "hsr: %#08x\n", hsr_ec,
+                                (unsigned int)vcpu->arch.hsr);
+                        BUG();
+                }
+
+                /*
+                 * See ARM ARM B1.14.1: "Hyp traps on instructions
+                 * that fail their condition code check"
+                 */
+                if (!kvm_condition_valid(vcpu)) {
+                        bool is_wide = vcpu->arch.hsr & HSR_IL;
+                        kvm_skip_instr(vcpu, is_wide);
+                        return 1;
+                }
+
+                return arm_exit_handlers[hsr_ec](vcpu, run);
+        default:
+                kvm_pr_unimpl("Unsupported exception type: %d",
+                              exception_index);
+                run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+                return 0;
+        }
+}
+
+static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
+{
+        if (likely(vcpu->arch.has_run_once))
+                return 0;
+
+        vcpu->arch.has_run_once = true;
+
+        /*
+         * Initialize the VGIC before running a vcpu the first time on
+         * this VM.
+         */
+        if (irqchip_in_kernel(vcpu->kvm) &&
+            unlikely(!vgic_initialized(vcpu->kvm))) {
+                int ret = kvm_vgic_init(vcpu->kvm);
+                if (ret)
+                        return ret;
+        }
+
+        /*
+         * Handle the "start in power-off" case by calling into the
+         * PSCI code.
+         */
+        if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) {
+                *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF;
+                kvm_psci_call(vcpu);
+        }
+
+        return 0;
+}
+
+static void vcpu_pause(struct kvm_vcpu *vcpu)
+{
+        wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
+
+        wait_event_interruptible(*wq, !vcpu->arch.pause);
+}
+
+/**
+ * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
+ * @vcpu:       The VCPU pointer
+ * @run:        The kvm_run structure pointer used for userspace state exchange
+ *
+ * This function is called through the VCPU_RUN ioctl called from user space. It
+ * will execute VM code in a loop until the time slice for the process is used
+ * or some emulation is needed from user space in which case the function will
+ * return with return value 0 and with the kvm_run structure filled in with the
+ * required data for the requested emulation.
+ */
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+        int ret;
+        sigset_t sigsaved;
+
+        /* Make sure they initialize the vcpu with KVM_ARM_VCPU_INIT */
+        if (unlikely(vcpu->arch.target < 0))
+                return -ENOEXEC;
+
+        ret = kvm_vcpu_first_run_init(vcpu);
+        if (ret)
+                return ret;
+
+        if (run->exit_reason == KVM_EXIT_MMIO) {
+                ret = kvm_handle_mmio_return(vcpu, vcpu->run);
+                if (ret)
+                        return ret;
+        }
+
+        if (vcpu->sigset_active)
+                sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
+
+        ret = 1;
+        run->exit_reason = KVM_EXIT_UNKNOWN;
+        while (ret > 0) {
+                /*
+                 * Check conditions before entering the guest
+                 */
+                cond_resched();
+
+                update_vttbr(vcpu->kvm);
+
+                if (vcpu->arch.pause)
+                        vcpu_pause(vcpu);
+
+                kvm_vgic_flush_hwstate(vcpu);
+                kvm_timer_flush_hwstate(vcpu);
+
+                local_irq_disable();
+
+                /*
+                 * Re-check atomic conditions
+                 */
+                if (signal_pending(current)) {
+                        ret = -EINTR;
+                        run->exit_reason = KVM_EXIT_INTR;
+                }
+
+                if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
+                        local_irq_enable();
+                        kvm_timer_sync_hwstate(vcpu);
+                        kvm_vgic_sync_hwstate(vcpu);
+                        continue;
+                }
+
+                /**************************************************************
+                 * Enter the guest
+                 */
+                trace_kvm_entry(*vcpu_pc(vcpu));
+                kvm_guest_enter();
+                vcpu->mode = IN_GUEST_MODE;
+
+                ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
+
+                vcpu->mode = OUTSIDE_GUEST_MODE;
+                vcpu->arch.last_pcpu = smp_processor_id();
+                kvm_guest_exit();
+                trace_kvm_exit(*vcpu_pc(vcpu));
+                /*
+                 * We may have taken a host interrupt in HYP mode (ie
+                 * while executing the guest). This interrupt is still
+                 * pending, as we haven't serviced it yet!
+                 *
+                 * We're now back in SVC mode, with interrupts
+                 * disabled.  Enabling the interrupts now will have
+                 * the effect of taking the interrupt again, in SVC
+                 * mode this time.
+                 */
+                local_irq_enable();
+
+                /*
+                 * Back from guest
+                 *************************************************************/
+
+                kvm_timer_sync_hwstate(vcpu);
+                kvm_vgic_sync_hwstate(vcpu);
+
+                ret = handle_exit(vcpu, run, ret);
+        }
+
+        if (vcpu->sigset_active)
+                sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+        return ret;
+}
+
+static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
+{
+        int bit_index;
+        bool set;
+        unsigned long *ptr;
+
+        if (number == KVM_ARM_IRQ_CPU_IRQ)
+                bit_index = __ffs(HCR_VI);
+        else /* KVM_ARM_IRQ_CPU_FIQ */
+                bit_index = __ffs(HCR_VF);
+
+        ptr = (unsigned long *)&vcpu->arch.irq_lines;
+        if (level)
+                set = test_and_set_bit(bit_index, ptr);
+        else
+                set = test_and_clear_bit(bit_index, ptr);
+
+        /*
+         * If we didn't change anything, no need to wake up or kick other CPUs
+         */
+        if (set == level)
+                return 0;
+
+        /*
+         * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
+         * trigger a world-switch round on the running physical CPU to set the
+         * virtual IRQ/FIQ fields in the HCR appropriately.
+         */
+        kvm_vcpu_kick(vcpu);
+
+        return 0;
+}
+
+int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level)
+{
+        u32 irq = irq_level->irq;
+        unsigned int irq_type, vcpu_idx, irq_num;
+        int nrcpus = atomic_read(&kvm->online_vcpus);
+        struct kvm_vcpu *vcpu = NULL;
+        bool level = irq_level->level;
+
+        irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
+        vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
+        irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
+
+        trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
+
+        switch (irq_type) {
+        case KVM_ARM_IRQ_TYPE_CPU:
+                if (irqchip_in_kernel(kvm))
+                        return -ENXIO;
+
+                if (vcpu_idx >= nrcpus)
+                        return -EINVAL;
+
+                vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+                if (!vcpu)
+                        return -EINVAL;
+
+                if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
+                        return -EINVAL;
+
+                return vcpu_interrupt_line(vcpu, irq_num, level);
+        case KVM_ARM_IRQ_TYPE_PPI:
+                if (!irqchip_in_kernel(kvm))
+                        return -ENXIO;
+
+                if (vcpu_idx >= nrcpus)
+                        return -EINVAL;
+
+                vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+                if (!vcpu)
+                        return -EINVAL;
+
+                if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
+                        return -EINVAL;
+
+                return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
+        case KVM_ARM_IRQ_TYPE_SPI:
+                if (!irqchip_in_kernel(kvm))
+                        return -ENXIO;
+
+                if (irq_num < VGIC_NR_PRIVATE_IRQS ||
+                    irq_num > KVM_ARM_IRQ_GIC_MAX)
+                        return -EINVAL;
+
+                return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
+        }
+
+        return -EINVAL;
+}
+
+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;
+
+        switch (ioctl) {
+        case KVM_ARM_VCPU_INIT: {
+                struct kvm_vcpu_init init;
+
+                if (copy_from_user(&init, argp, sizeof(init)))
+                        return -EFAULT;
+
+                return kvm_vcpu_set_target(vcpu, &init);
+
+        }
+        case KVM_SET_ONE_REG:
+        case KVM_GET_ONE_REG: {
+                struct kvm_one_reg reg;
+                if (copy_from_user(&reg, argp, sizeof(reg)))
+                        return -EFAULT;
+                if (ioctl == KVM_SET_ONE_REG)
+                        return kvm_arm_set_reg(vcpu, &reg);
+                else
+                        return kvm_arm_get_reg(vcpu, &reg);
+        }
+        case KVM_GET_REG_LIST: {
+                struct kvm_reg_list __user *user_list = argp;
+                struct kvm_reg_list reg_list;
+                unsigned n;
+
+                if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
+                        return -EFAULT;
+                n = reg_list.n;
+                reg_list.n = kvm_arm_num_regs(vcpu);
+                if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
+                        return -EFAULT;
+                if (n < reg_list.n)
+                        return -E2BIG;
+                return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
+        }
+        default:
+                return -EINVAL;
+        }
+}
+
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+{
+        return -EINVAL;
+}
+
+static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
+                                        struct kvm_arm_device_addr *dev_addr)
+{
+        unsigned long dev_id, type;
+
+        dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
+                KVM_ARM_DEVICE_ID_SHIFT;
+        type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
+                KVM_ARM_DEVICE_TYPE_SHIFT;
+
+        switch (dev_id) {
+        case KVM_ARM_DEVICE_VGIC_V2:
+                if (!vgic_present)
+                        return -ENXIO;
+                return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
+        default:
+                return -ENODEV;
+        }
+}
+
+long kvm_arch_vm_ioctl(struct file *filp,
+                       unsigned int ioctl, unsigned long arg)
+{
+        struct kvm *kvm = filp->private_data;
+        void __user *argp = (void __user *)arg;
+
+        switch (ioctl) {
+        case KVM_CREATE_IRQCHIP: {
+                if (vgic_present)
+                        return kvm_vgic_create(kvm);
+                else
+                        return -ENXIO;
+        }
+        case KVM_ARM_SET_DEVICE_ADDR: {
+                struct kvm_arm_device_addr dev_addr;
+
+                if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
+                        return -EFAULT;
+                return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
+        }
+        default:
+                return -EINVAL;
+        }
+}
+
+static void cpu_init_hyp_mode(void *vector)
+{
+        unsigned long long pgd_ptr;
+        unsigned long pgd_low, pgd_high;
+        unsigned long hyp_stack_ptr;
+        unsigned long stack_page;
+        unsigned long vector_ptr;
+
+        /* Switch from the HYP stub to our own HYP init vector */
+        __hyp_set_vectors((unsigned long)vector);
+
+        pgd_ptr = (unsigned long long)kvm_mmu_get_httbr();
+        pgd_low = (pgd_ptr & ((1ULL << 32) - 1));
+        pgd_high = (pgd_ptr >> 32ULL);
+        stack_page = __get_cpu_var(kvm_arm_hyp_stack_page);
+        hyp_stack_ptr = stack_page + PAGE_SIZE;
+        vector_ptr = (unsigned long)__kvm_hyp_vector;
+
+        /*
+         * Call initialization code, and switch to the full blown
+         * HYP code. The init code doesn't need to preserve these registers as
+         * r1-r3 and r12 are already callee save according to the AAPCS.
+         * Note that we slightly misuse the prototype by casing the pgd_low to
+         * a void *.
+         */
+        kvm_call_hyp((void *)pgd_low, pgd_high, hyp_stack_ptr, vector_ptr);
+}
+
+/**
+ * Inits Hyp-mode on all online CPUs
+ */
+static int init_hyp_mode(void)
+{
+        phys_addr_t init_phys_addr;
+        int cpu;
+        int err = 0;
+
+        /*
+         * Allocate Hyp PGD and setup Hyp identity mapping
+         */
+        err = kvm_mmu_init();
+        if (err)
+                goto out_err;
+
+        /*
+         * It is probably enough to obtain the default on one
+         * CPU. It's unlikely to be different on the others.
+         */
+        hyp_default_vectors = __hyp_get_vectors();
+
+        /*
+         * Allocate stack pages for Hypervisor-mode
+         */
+        for_each_possible_cpu(cpu) {
+                unsigned long stack_page;
+
+                stack_page = __get_free_page(GFP_KERNEL);
+                if (!stack_page) {
+                        err = -ENOMEM;
+                        goto out_free_stack_pages;
+                }
+
+                per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
+        }
+
+        /*
+         * Execute the init code on each CPU.
+         *
+         * Note: The stack is not mapped yet, so don't do anything else than
+         * initializing the hypervisor mode on each CPU using a local stack
+         * space for temporary storage.
+         */
+        init_phys_addr = virt_to_phys(__kvm_hyp_init);
+        for_each_online_cpu(cpu) {
+                smp_call_function_single(cpu, cpu_init_hyp_mode,
+                                         (void *)(long)init_phys_addr, 1);
+        }
+
+        /*
+         * Unmap the identity mapping
+         */
+        kvm_clear_hyp_idmap();
+
+        /*
+         * Map the Hyp-code called directly from the host
+         */
+        err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
+        if (err) {
+                kvm_err("Cannot map world-switch code\n");
+                goto out_free_mappings;
+        }
+
+        /*
+         * Map the Hyp stack pages
+         */
+        for_each_possible_cpu(cpu) {
+                char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
+                err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
+
+                if (err) {
+                        kvm_err("Cannot map hyp stack\n");
+                        goto out_free_mappings;
+                }
+        }
+
+        /*
+         * Map the host VFP structures
+         */
+        kvm_host_vfp_state = alloc_percpu(struct vfp_hard_struct);
+        if (!kvm_host_vfp_state) {
+                err = -ENOMEM;
+                kvm_err("Cannot allocate host VFP state\n");
+                goto out_free_mappings;
+        }
+
+        for_each_possible_cpu(cpu) {
+                struct vfp_hard_struct *vfp;
+
+                vfp = per_cpu_ptr(kvm_host_vfp_state, cpu);
+                err = create_hyp_mappings(vfp, vfp + 1);
+
+                if (err) {
+                        kvm_err("Cannot map host VFP state: %d\n", err);
+                        goto out_free_vfp;
+                }
+        }
+
+        /*
+         * Init HYP view of VGIC
+         */
+        err = kvm_vgic_hyp_init();
+        if (err)
+                goto out_free_vfp;
+
+#ifdef CONFIG_KVM_ARM_VGIC
+                vgic_present = true;
+#endif
+
+        /*
+         * Init HYP architected timer support
+         */
+        err = kvm_timer_hyp_init();
+        if (err)
+                goto out_free_mappings;
+
+        kvm_info("Hyp mode initialized successfully\n");
+        return 0;
+out_free_vfp:
+        free_percpu(kvm_host_vfp_state);
+out_free_mappings:
+        free_hyp_pmds();
+out_free_stack_pages:
+        for_each_possible_cpu(cpu)
+                free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+out_err:
+        kvm_err("error initializing Hyp mode: %d\n", err);
+        return err;
+}
+
+/**
+ * Initialize Hyp-mode and memory mappings on all CPUs.
+ */
+int kvm_arch_init(void *opaque)
+{
+        int err;
+
+        if (!is_hyp_mode_available()) {
+                kvm_err("HYP mode not available\n");
+                return -ENODEV;
+        }
+
+        if (kvm_target_cpu() < 0) {
+                kvm_err("Target CPU not supported!\n");
+                return -ENODEV;
+        }
+
+        err = init_hyp_mode();
+        if (err)
+                goto out_err;
+
+        kvm_coproc_table_init();
+        return 0;
+out_err:
+        return err;
+}
+
+/* NOP: Compiling as a module not supported */
+void kvm_arch_exit(void)
+{
+}
+
+static int arm_init(void)
+{
+        int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+        return rc;
+}
+
+module_init(arm_init);