diff options
| author | Avi Kivity <avi@redhat.com> | 2012-06-07 14:11:36 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-09 14:19:00 +0300 |
| commit | 6d6eede4a0492c7478d44d7c8fae80c3bcf529d9 (patch) | |
| tree | 21f6c08dd13c8dddf4c64e29a0f77e7f230b75b5 /arch/x86/kvm/emulate.c | |
| parent | 0017f93a2776597b798ec1a9594e41dfd96d3c11 (diff) | |
KVM: x86 emulator: emulate cpuid
Opcode 0F A2.
Used by Linux during the mode change trampoline while in a state that is
not virtualizable on vmx without unrestricted_guest, so we need to emulate
it is emulate_invalid_guest_state=1.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index ba1f8ecaab5..db95a55d593 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3142,6 +3142,20 @@ static int em_bsr(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int em_cpuid(struct x86_emulate_ctxt *ctxt) +{ + u32 eax, ebx, ecx, edx; + + eax = ctxt->regs[VCPU_REGS_RAX]; + ecx = ctxt->regs[VCPU_REGS_RCX]; + ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); + ctxt->regs[VCPU_REGS_RAX] = eax; + ctxt->regs[VCPU_REGS_RBX] = ebx; + ctxt->regs[VCPU_REGS_RCX] = ecx; + ctxt->regs[VCPU_REGS_RDX] = edx; + return X86EMUL_CONTINUE; +} + static bool valid_cr(int nr) { switch (nr) { @@ -3634,7 +3648,7 @@ static struct opcode twobyte_table[256] = { X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)), /* 0xA0 - 0xA7 */ I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg), - DI(ImplicitOps, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt), + II(ImplicitOps, em_cpuid, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt), D(DstMem | SrcReg | Src2ImmByte | ModRM), D(DstMem | SrcReg | Src2CL | ModRM), N, N, /* 0xA8 - 0xAF */ |