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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>
This commit is contained in:
Avi Kivity 2012-06-07 14:11:36 +03:00
parent 0017f93a27
commit 6d6eede4a0
1 changed files with 15 additions and 1 deletions
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16
arch/x86/kvm/emulate.c
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@ -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 */