EVTCHNOP_alloc_unbound
rc = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, &arg);
err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,