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* KVM: Purify x86_decode_insn() error case managementLaurent Vivier2008-01-30
| | | | | | | The only valid case is on protected page access, other cases are errors. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86_emulator: no writeback for btQing He2008-01-30
| | | | | Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: Remove no_wb, use dst.type = OP_NONE insteadLaurent Vivier2008-01-30
| | | | | | | Remove no_wb, use dst.type = OP_NONE instead, idea stollen from xen-3.1 Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: remove _eflags and use directly ctxt->eflags.Laurent Vivier2008-01-30
| | | | | | | | | Remove _eflags and use directly ctxt->eflags. Caching eflags is not needed as it is restored to vcpu by kvm_main.c:emulate_instruction() from ctxt->eflags only if emulation doesn't fail. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: split some decoding into functions for readabilityLaurent Vivier2008-01-30
| | | | | | | | To improve readability, move push, writeback, and grp 1a/2/3/4/5/9 emulation parts into functions. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: MMU: Ignore reserved bits in cr3 in non-pae modeRyan Harper2008-01-30
| | | | | | | | | | This patch removes the fault injected when the guest attempts to set reserved bits in cr3. X86 hardware doesn't generate a fault when setting reserved bits. The result of this patch is that vmware-server, running within a kvm guest, boots and runs memtest from an iso. Signed-off-by: Ryan Harper <ryanh@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: MMU: Make flooding detection work when guest page faults are bypassedAvi Kivity2008-01-30
| | | | | | | | | When we allow guest page faults to reach the guests directly, we lose the fault tracking which allows us to detect demand paging. So we provide an alternate mechnism by clearing the accessed bit when we set a pte, and checking it later to see if the guest actually used it. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Allow not-present guest page faults to bypass kvmAvi Kivity2008-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | There are two classes of page faults trapped by kvm: - host page faults, where the fault is needed to allow kvm to install the shadow pte or update the guest accessed and dirty bits - guest page faults, where the guest has faulted and kvm simply injects the fault back into the guest to handle The second class, guest page faults, is pure overhead. We can eliminate some of it on vmx using the following evil trick: - when we set up a shadow page table entry, if the corresponding guest pte is not present, set up the shadow pte as not present - if the guest pte _is_ present, mark the shadow pte as present but also set one of the reserved bits in the shadow pte - tell the vmx hardware not to trap faults which have the present bit clear With this, normal page-not-present faults go directly to the guest, bypassing kvm entirely. Unfortunately, this trick only works on Intel hardware, as AMD lacks a way to discriminate among page faults based on error code. It is also a little risky since it uses reserved bits which might become unreserved in the future, so a module parameter is provided to disable it. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: VMX: Further reduce efer reloadsAvi Kivity2008-01-30
| | | | | | | | | | | | | KVM avoids reloading the efer msr when the difference between the guest and host values consist of the long mode bits (which are switched by hardware) and the NX bit (which is emulated by the KVM MMU). This patch also allows KVM to ignore SCE (syscall enable) when the guest is running in 32-bit mode. This is because the syscall instruction is not available in 32-bit mode on Intel processors, so the SCE bit is effectively meaningless. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Call x86_decode_insn() only when neededLaurent Vivier2008-01-30
| | | | | | | | | Move emulate_ctxt to kvm_vcpu to keep emulate context when we exit from kvm module. Call x86_decode_insn() only when needed. Modify x86_emulate_insn() to not modify the context if it must be re-entered. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn()Laurent Vivier2008-01-30
| | | | | | | | emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn(). x86_emulate_insn() is x86_emulate_memop() without the decoding part. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: move all decoding process to function x86_decode_insn()Laurent Vivier2008-01-30
| | | | | | | Split the decoding process into a new function x86_decode_insn(). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: move all x86_emulate_memop() to a structureLaurent Vivier2008-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move all x86_emulate_memop() common variables between decode and execute to a structure decode_cache. This will help in later separating decode and emulate. struct decode_cache { u8 twobyte; u8 b; u8 lock_prefix; u8 rep_prefix; u8 op_bytes; u8 ad_bytes; struct operand src; struct operand dst; unsigned long *override_base; unsigned int d; unsigned long regs[NR_VCPU_REGS]; unsigned long eip; /* modrm */ u8 modrm; u8 modrm_mod; u8 modrm_reg; u8 modrm_rm; u8 use_modrm_ea; unsigned long modrm_ea; unsigned long modrm_val; }; Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: remove unused functionsLaurent Vivier2008-01-30
| | | | | | | Remove #ifdef functions never used Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Refactor hypercall infrastructure (v3)Anthony Liguori2008-01-30
| | | | | | | | | | | | | | | | | | This patch refactors the current hypercall infrastructure to better support live migration and SMP. It eliminates the hypercall page by trapping the UD exception that would occur if you used the wrong hypercall instruction for the underlying architecture and replacing it with the right one lazily. A fall-out of this patch is that the unhandled hypercalls no longer trap to userspace. There is very little reason though to use a hypercall to communicate with userspace as PIO or MMIO can be used. There is no code in tree that uses userspace hypercalls. [avi: fix #ud injection on vmx] Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: Add vmmcall/vmcall to x86_emulate (v3)Anthony Liguori2008-01-30
| | | | | | | | Add vmmcall/vmcall to x86_emulate. Future patch will implement functionality for these instructions. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* x86: get rid of _MASK flagsGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | There's no need for the *_MASK flags (TF_MASK, IF_MASK, etc), found in processor.h (both _32 and _64). They have a one-to-one mapping with the EFLAGS value. This patch removes the definitions, and use the already existent X86_EFLAGS_ version when applicable. [ roland@redhat.com: KVM build fixes. ] Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify struct desc_ptrGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | This patch unifies struct desc_ptr between i386 and x86_64. They can be expressed in the exact same way in C code, only having to change the name of one of them. As Xgt_desc_struct is ugly and big, this is the one that goes away. There's also a padding field in i386, but it is not really needed in the C structure definition. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* Driver core: change sysdev classes to use dynamic kobject namesKay Sievers2008-01-24
| | | | | | | | | | All kobjects require a dynamically allocated name now. We no longer need to keep track if the name is statically assigned, we can just unconditionally free() all kobject names on cleanup. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* KVM: SVM: Fix FPU leak while emulating cltsAmit Shah2007-11-27
| | | | | | | | | | The clts code didn't use set_cr0 properly, so our lazy FPU processing wasn't being done by the clts instruction at all. (this isn't called on Intel as the hardware does the decode for us) Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: SVM: Unload guest fpu on vcpu_put()Avi Kivity2007-11-27
| | | | | | | Not unloading the guest fpu can cause fpu leaks from guest to guest (or host to guest). Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: Use emulator_write_emulated and not emulator_write_stdAmit Shah2007-11-27
| | | | | | | | | | emulator_write_std() is not implemented, and calling write_emulated should work just as well in place of write_std. Fixes emulator failures with the push r/m instruction. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix the saving of of the eip valueIzik Eidus2007-11-27
| | | | | | | | this make sure that no matter what is the operand size, all the value of the eip will be saved Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix JMP_RELIzik Eidus2007-11-27
| | | | | | | | | Change JMP_REL to call to register_address_increment(): the operands size should not effect the calculation of the eip, instead the ad_bytes should affect it. Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: SVM: Intercept the 'invd' and 'wbinvd' instructionsAvi Kivity2007-11-08
| | | | | | | | | 'invd' can destroy host data, and 'wbinvd' allows the guest to induce long (milliseconds) latencies. Noted by Ben Serebrin. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: invd instructionAvi Kivity2007-11-08
| | | | | | Emulate the 'invd' instruction (opcode 0f 08). Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: SVM: Defer nmi processing until switch to host state is completeAvi Kivity2007-11-08
| | | | | | | | If we stgi() too soon, nmis can reach the processor even though interrupts are disabled, catching it in a half-switched state. Delay the stgi() until we're done switching. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: SVM: Fix SMP with kernel apicAvi Kivity2007-11-08
| | | | | | AP processor needs to reset to the SIPI vector, not normal INIT. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix 'push imm8' emulationAvi Kivity2007-11-08
| | | | | | | | 'push imm8' found itself in the wrong switch somehow, so it is never executed. This fixes Windows 2003 installation. Signed-off-by: Avi Kivity <avi@qumranet.com>
* Consolidate host virtualization support under Virtualization menuRusty Russell2007-10-23
| | | | | | | Move lguest under the virtualization menu. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Avi Kivity <avi@qumranet.com>
* KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs()Laurent Vivier2007-10-22
| | | | | | | | In kvm_flush_remote_tlbs(), replace a loop using smp_call_function_single() by a single call to smp_call_function_mask() (which is new for x86_64). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Improve local apic timer wraparound handlingKevin Pedretti2007-10-22
| | | | | | | | | | Better handle wrap-around cases when reading the APIC CCR (current count register). Also, if ICR is 0, CCR should also be 0... previously reading CCR before setting ICR would result in a large kinda-random number. Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Fix local apic timer divide by zeroKevin Pedretti2007-10-22
| | | | | | | | | | | | | | kvm_lapic_reset() was initializing apic->timer.divide_count to 0, which could potentially lead to a divide by zero error in apic_get_tmcct(). Any guest that reads the APIC's CCR (current count) register before setting DCR (divide configuration) would trigger a divide by zero exception in the host kernel, leading to a host-OS crash. This patch results in apic->timer.divide_count being initialized to 2 at reset, eliminating the bug (DCR=0 at reset, meaning divide by 2). Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Move kvm_guest_exit() after local_irq_enable()Laurent Vivier2007-10-22
| | | | | | | | | | We need to make sure that the timer interrupt happens before we clear PF_VCPU, so the accounting code actually sees guest mode. http://lkml.org/lkml/2007/10/15/114 Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix access registers for instructions with ModR/M byte ↵Aurelien Jarno2007-10-22
| | | | | | | | | | | | | | and Mod = 3 The patch belows changes the access type to register from memory for instructions that are declared as SrcMem or DstMem, but have a ModR/M byte with Mod = 3. It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU, which are needed for FreeBSD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: VMX: Force vm86 mode if setting flags during real modeAvi Kivity2007-10-22
| | | | | | | When resetting from userspace, we need to handle the flags being cleared even after we are in real mode. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: implement 'movnti mem, reg'Sheng Yang2007-10-22
| | | | | | | | | Implement emulation of instruction: movnti m32/m64, r32/r64 opcode: 0x0f 0xc3 Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: VMX: Reset mmu context when entering real modeEddie Dong2007-10-22
| | | | | | | | | | | | | Resetting an SMP guest will force AP enter real mode (RESET) with paging enabled in protected mode. While current enter_rmode() can only handle mode switch from nonpaging mode to real mode which leads to SMP reboot failure. Fix by reloading the mmu context on entering real mode. Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: VMX: Handle NMIs before enabling interrupts and preemptionAvi Kivity2007-10-22
| | | | | | | This makes sure we handle NMI on the current cpu, and that we don't service maskable interrupts before non-maskable ones. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: MMU: Set shadow pte atomically in mmu_pte_write_zap_pte()Izik Eidus2007-10-22
| | | | | | | Setting shadow page table entry should be set atomicly using set_shadow_pte(). Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix repne/repnz decodingLaurent Vivier2007-10-22
| | | | | | | | | | | | | The repnz/repne instructions must set rep_prefix to 1 like rep/repe/repz. This patch correct the disk probe problem met with OpenBSD. This issue appears with commit e70669abd4e60dfea3ac1639848e20e2b8dd1255 because before it, the decoding was done internally to kvm and after it is done by x86_emulate.c (which doesn't do it correctly). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix merge screwup due to emulator splitNitin A Kamble2007-10-22
| | | | | | | | This code has gone to wrong place in the file. Moving it back to right location. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* sched: guest CPU accounting: maintain guest state in KVMLaurent Vivier2007-10-15
| | | | | | | | | | Modify KVM to update guest time accounting. [ mingo@elte.hu: ported to 2.6.24 KVM. ] Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Acked-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* KVM: Skip pio instruction when it is emulated, not executedAvi Kivity2007-10-13
| | | | | | | | | | | If we defer updating rip until pio instructions are executed, we have a problem with reset: a pio reset updates rip, and when the instruction completes we skip the emulated instruction, pointing rip somewhere completely unrelated. Fix by updating rip when we see decode the instruction, not after emulation. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: popfNitin A Kamble2007-10-13
| | | | | | | | | Implement emulation of instruction: popf opcode: 0x9d Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: fix src, dst value initializationNitin A Kamble2007-10-13
| | | | | | | | Some operand fetches are less than the machine word size and can result in stale bits if used together with operands of different sizes. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: jmp absNitin A Kamble2007-10-13
| | | | | | | | | Implement emulation of instruction: jump absolute r/m opcode: 0xff /4 Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: leaNitin A Kamble2007-10-13
| | | | | | | | | Implement emulation of instruction lea r16/r32, m opcode: 0x8d: Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: X86 emulator: jump conditional shortNitin A Kamble2007-10-13
| | | | | | | | | Implement emulation of more jump conditional instructions jcc shortrel opcodes: 0x70 - 0x7f Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: x86 emulator: imlpement jump conditional relativeNitin A Kamble2007-10-13
| | | | | | | | | Implement emulation of instruction: jump conditional rel opcodes: 0x0f 0x80 - 0x0f 0x8f Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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