KVM_CLOCK_HOST_TSC
(KVM_CLOCK_TSC_STABLE | KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC)
data->flags |= KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC;
#define EXPECTED_FLAGS (KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC)