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

From: Vitaly Kuznetsov
Date: Mon Apr 19 2021 - 12:02:11 EST


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@xxxxxxxxxx>
---
arch/x86/kvm/hyperv.c | 3 +++
1 file changed, 3 insertions(+)

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;
}
--
2.30.2