linux-kernel - [PATCH v2 07/30] KVM: x86: hyper-v: Honor HV_MSR_TIME_REF_COUNT

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Message-Id: <20210521095204.2161214-8-vkuznets@redhat.com>
Date:   Fri, 21 May 2021 11:51:41 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 07/30] KVM: x86: hyper-v: Honor HV_MSR_TIME_REF_COUNT_AVAILABLE privilege bit

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@...hat.com>
---
 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;
 	}
-- 
2.31.1