We can also expose Hyper-V frequency MSRs when reenlightenment feature is enabled and TSC frequency is known, Hyper-V on KVM will provide stable TSC page clocksources to its guests.
Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com> --- - Expose frequency MSRs only when either INVTSC or Reenlightenment is provided [Paolo Bonzini] --- target/i386/kvm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 75f4e1d69e..2c3c19d690 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -651,7 +651,8 @@ static int hyperv_handle_properties(CPUState *cs) env->features[FEAT_HYPERV_EAX] |= HV_TIME_REF_COUNT_AVAILABLE; env->features[FEAT_HYPERV_EAX] |= HV_REFERENCE_TSC_AVAILABLE; - if (has_msr_hv_frequencies && tsc_is_stable_and_known(env)) { + if (has_msr_hv_frequencies && env->tsc_khz && + (tsc_is_stable_and_known(env) || cpu->hyperv_reenlightenment)) { env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_FREQUENCY_MSRS; env->features[FEAT_HYPERV_EDX] |= HV_FREQUENCY_MSRS_AVAILABLE; } -- 2.14.3