Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e83b9fc..09bec0c 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2275,6 +2275,22 @@ 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) }
@@ -2465,7 +2481,8 @@ 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 */
--
1.7.1
--
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