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KVM: do not #GP on perf MSR writes when vPMU is disabled

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Return to behaviour perf MSR had before introducing vPMU in case vPMU
is disabled. Some guests access those registers unconditionally and do
not expect it to fail.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2012-01-15 14:17:22 +02:00 committed by Avi Kivity
parent c2226fc9e8
commit 5753785fa9
1 changed files with 22 additions and 0 deletions
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22
arch/x86/kvm/x86.c
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@ -1495,6 +1495,8 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
bool pr = false;
switch (msr) {
case MSR_EFER:
return set_efer(vcpu, data);
@ -1635,6 +1637,18 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
case MSR_P6_PERFCTR0:
case MSR_P6_PERFCTR1:
pr = true;
case MSR_P6_EVNTSEL0:
case MSR_P6_EVNTSEL1:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_set_msr(vcpu, msr, data);
if (pr || data != 0)
pr_unimpl(vcpu, "disabled perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
case MSR_K7_CLK_CTL:
/*
* Ignore all writes to this no longer documented MSR.
@ -1835,6 +1849,14 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_FAM10H_MMIO_CONF_BASE:
data = 0;
break;
case MSR_P6_PERFCTR0:
case MSR_P6_PERFCTR1:
case MSR_P6_EVNTSEL0:
case MSR_P6_EVNTSEL1:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_get_msr(vcpu, msr, pdata);
data = 0;
break;
case MSR_IA32_UCODE_REV:
data = 0x100000000ULL;
break;