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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>
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0017f93a27
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6d6eede4a0
1 changed files with 15 additions and 1 deletions
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@ -3142,6 +3142,20 @@ static int em_bsr(struct x86_emulate_ctxt *ctxt)
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return X86EMUL_CONTINUE;
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}
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static int em_cpuid(struct x86_emulate_ctxt *ctxt)
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{
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u32 eax, ebx, ecx, edx;
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eax = ctxt->regs[VCPU_REGS_RAX];
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ecx = ctxt->regs[VCPU_REGS_RCX];
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ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
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ctxt->regs[VCPU_REGS_RAX] = eax;
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ctxt->regs[VCPU_REGS_RBX] = ebx;
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ctxt->regs[VCPU_REGS_RCX] = ecx;
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ctxt->regs[VCPU_REGS_RDX] = edx;
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return X86EMUL_CONTINUE;
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}
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static bool valid_cr(int nr)
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{
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switch (nr) {
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@ -3634,7 +3648,7 @@ static struct opcode twobyte_table[256] = {
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X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
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/* 0xA0 - 0xA7 */
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I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),
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DI(ImplicitOps, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt),
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II(ImplicitOps, em_cpuid, cpuid), I(DstMem | SrcReg | ModRM | BitOp, em_bt),
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D(DstMem | SrcReg | Src2ImmByte | ModRM),
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D(DstMem | SrcReg | Src2CL | ModRM), N, N,
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/* 0xA8 - 0xAF */
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