From 48bb5d3c401679e41e7a7f06ca31b3e54a6168f7 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 18 Aug 2010 18:54:34 +0300 Subject: [PATCH] KVM: x86 emulator: implement RDTSC (opcode 0F 31) Signed-off-by: Avi Kivity --- arch/x86/kvm/emulate.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7f7fc646678a..ed192d220201 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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 */ -- 2.34.1