[PATCH v2 14/30] KVM: x86: hyper-v: Honor HV_ACCESS_FREQUENCY_MSRS privilege bit

From: Vitaly Kuznetsov
Date: Fri May 21 2021 - 05:54:41 EST


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@xxxxxxxxxx>
---
arch/x86/kvm/hyperv.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index a41ad21768ed..8821981e17d3 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1244,6 +1244,10 @@ 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;
}
--
2.31.1