diff mbox series

[07/30] KVM: x86: hyper-v: Honor HV_MSR_TIME_REF_COUNT_AVAILABLE privilege bit

Message ID 20210419160127.192712-8-vkuznets@redhat.com (mailing list archive)
State New
Headers show
Series KVM: x86: hyper-v: Fine-grained access check to Hyper-V hypercalls and MSRs | expand

Commit Message

Vitaly Kuznetsov April 19, 2021, 4:01 p.m. UTC
HV_X64_MSR_TIME_REF_COUNT is only available to guest when
HV_MSR_TIME_REF_COUNT_AVAILABLE bit is exposed.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/hyperv.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 152d991ed033..0b2261a50ee8 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1207,6 +1207,9 @@  static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr)
 	case HV_X64_MSR_VP_RUNTIME:
 		return hv_vcpu->cpuid_cache.features_eax &
 			HV_MSR_VP_RUNTIME_AVAILABLE;
+	case HV_X64_MSR_TIME_REF_COUNT:
+		return hv_vcpu->cpuid_cache.features_eax &
+			HV_MSR_TIME_REF_COUNT_AVAILABLE;
 	default:
 		break;
 	}