KVM: x86: hyper-v: Honor HV_ACCESS_FREQUENCY_MSRS privilege bit

HV_X64_MSR_TSC_FREQUENCY/HV_X64_MSR_APIC_FREQUENCY are only available to
guest when HV_ACCESS_FREQUENCY_MSRS bit is exposed.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-15-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index a168b72334cc48c85f7bb2d05160dfce801adab5..2a0660b4e779dd313bd199d69f9749f58c02480a 100644 (file)
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1253,6 +1253,10 @@ static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr)
                return hv_vcpu->cpuid_cache.features_eax &
                        HV_MSR_APIC_ACCESS_AVAILABLE;
                break;
+       case HV_X64_MSR_TSC_FREQUENCY:
+       case HV_X64_MSR_APIC_FREQUENCY:
+               return hv_vcpu->cpuid_cache.features_eax &
+                       HV_ACCESS_FREQUENCY_MSRS;
        default:
                break;
        }