HV_X64_MSR_TSC_FREQUENCY/HV_X64_MSR_APIC_FREQUENCY are only available to guest when HV_ACCESS_FREQUENCY_MSRS bit is exposed. Note, writing to HV_X64_MSR_TSC_FREQUENCY/HV_X64_MSR_APIC_FREQUENCY is unsupported so kvm_hv_set_msr() doesn't need an additional check. Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> --- arch/x86/kvm/hyperv.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 9c4454873e00..e92a1109ad9b 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1637,9 +1637,17 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, pdata, host); } case HV_X64_MSR_TSC_FREQUENCY: + if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax & + HV_ACCESS_FREQUENCY_MSRS))) + return 1; + data = (u64)vcpu->arch.virtual_tsc_khz * 1000; break; case HV_X64_MSR_APIC_FREQUENCY: + if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax & + HV_ACCESS_FREQUENCY_MSRS))) + return 1; + data = APIC_BUS_FREQUENCY; break; default: -- 2.30.2
