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| author | Avi Kivity <avi@redhat.com> | 2010-08-18 19:54:34 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 12:51:14 +0400 |
| commit | 48bb5d3c401679e41e7a7f06ca31b3e54a6168f7 (patch) | |
| tree | 0dd588a481026f84755307fdc98fca155d353c5d /arch/x86/kvm/emulate.c | |
| parent | 7077aec0bcd2f827aeb84ccc56c6f4367c376436 (diff) | |
| download | linux-48bb5d3c401679e41e7a7f06ca31b3e54a6168f7.tar.xz | |
KVM: x86 emulator: implement RDTSC (opcode 0F 31)
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | 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 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 */ |