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| author | Liran Alon <liran.alon@oracle.com> | 2019-03-25 20:10:17 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-04-16 15:37:34 +0200 |
| commit | 672ff6cff80ca43bf3258410d2b887036969df5f (patch) | |
| tree | f0d20fbf2e1af6a187d742b9c67b448d3cca50a3 | |
| parent | x86/kvm: move kvm_load/put_guest_xcr0 into atomic context (diff) | |
| download | linux-672ff6cff80ca43bf3258410d2b887036969df5f.tar.xz linux-672ff6cff80ca43bf3258410d2b887036969df5f.zip | |
KVM: x86: Raise #GP when guest vCPU do not support PMU
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>
| -rw-r--r-- | arch/x86/kvm/pmu.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 58ead7db71a3..e39741997893 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -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) { bool fast_mode = idx & (1u << 31); + struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); struct kvm_pmc *pmc; u64 ctr_val; + if (!pmu->version) + return 1; + if (is_vmware_backdoor_pmc(idx)) return kvm_pmu_rdpmc_vmware(vcpu, idx, data); |