vm_normalize_hrtime
vm_normalize_hrtime(vatpit->vm, src->time_target);
out->vh_time_base = vm_normalize_hrtime(vhpet->vm, vhpet->base_time);
vm_normalize_hrtime(vhpet->vm,
vm_normalize_hrtime(vlapic->vm, vlapic->timer_fire_when);
out->vpt_time_base = vm_normalize_hrtime(vpmtmr->vm, vpmtmr->base_time);
out->vr_base_clock = vm_normalize_hrtime(vrtc->vm, vrtc->base_clock);
out->vr_last_period = vm_normalize_hrtime(vrtc->vm, vrtc->last_period);
hrtime_t vm_normalize_hrtime(struct vm *, hrtime_t);
MAX(vm_normalize_hrtime(vm, vm->suspend_when), 0);