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KVM: x86: Raise #GP when guest vCPU do not support PMU

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Before this change, reading a VMware pseduo PMC will succeed even when
PMU is not supported by guest. This can easily be seen by running
kvm-unit-test vmware_backdoors with "-cpu host,-pmu" option.

Reviewed-by: Mihai Carabas <mihai.carabas@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2019-03-25 21:10:17 +02:00 • committed by Paolo Bonzini
parent 1811d979c7
commit 672ff6cff8
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/pmu.c
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@ -281,9 +281,13 @@ static int kvm_pmu_rdpmc_vmware(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data) int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
{ {
bool fast_mode = idx & (1u << 31); bool fast_mode = idx & (1u << 31);
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc; struct kvm_pmc *pmc;
u64 ctr_val; u64 ctr_val;
if (!pmu->version)
return 1;
if (is_vmware_backdoor_pmc(idx)) if (is_vmware_backdoor_pmc(idx))
return kvm_pmu_rdpmc_vmware(vcpu, idx, data); return kvm_pmu_rdpmc_vmware(vcpu, idx, data);