CPUID_HV_MSR_TIME_REFCNT
if ((regs[0] & CPUID_HV_MSR_TIME_REFCNT) == 0)
(CPUID_HV_MSR_TIME_REFCNT | CPUID_HV_MSR_REFERENCE_TSC)) !=
(CPUID_HV_MSR_TIME_REFCNT | CPUID_HV_MSR_REFERENCE_TSC) ||
if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {