VTINPUT_EVENTQ
&sc->vsc_eventqueue, &sc->vsc_queues[VTINPUT_EVENTQ]);
sc->vsc_queues[VTINPUT_EVENTQ].vq_qsize = VTINPUT_RINGSZ;
sc->vsc_queues[VTINPUT_EVENTQ].vq_notify = pci_vtinput_notify_eventq;