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KVM: x86 emulator: implement RDTSC (opcode 0F 31)

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Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-18 18:54:34 +03:00
parent 7077aec0bc
commit 48bb5d3c40
1 changed files with 18 additions and 1 deletions
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19
arch/x86/kvm/emulate.c
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@ -2279,6 +2279,22 @@ static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
return em_imul(ctxt);
}
static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
{
unsigned cpl = ctxt->ops->cpl(ctxt->vcpu);
struct decode_cache *c = &ctxt->decode;
u64 tsc = 0;
if (cpl > 0 && (ctxt->ops->get_cr(4, ctxt->vcpu) & X86_CR4_TSD)) {
emulate_gp(ctxt, 0);
return X86EMUL_PROPAGATE_FAULT;
}
ctxt->ops->get_msr(ctxt->vcpu, MSR_IA32_TSC, &tsc);
c->regs[VCPU_REGS_RAX] = (u32)tsc;
c->regs[VCPU_REGS_RDX] = tsc >> 32;
return X86EMUL_CONTINUE;
}
#define D(_y) { .flags = (_y) }
#define N D(0)
#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@ -2469,7 +2485,8 @@ static struct opcode twobyte_table[256] = {
N, N, N, N,
N, N, N, N, N, N, N, N,
/* 0x30 - 0x3F */
D(ImplicitOps | Priv), N, D(ImplicitOps | Priv), N,
D(ImplicitOps | Priv), I(ImplicitOps, em_rdtsc),
D(ImplicitOps | Priv), N,
D(ImplicitOps), D(ImplicitOps | Priv), N, N,
N, N, N, N, N, N, N, N,
/* 0x40 - 0x4F */