@@ -331,6 +331,8 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
{
VirtIOBlockDataPlane *s;
Error *local_err = NULL;
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
*dataplane = NULL;
@@ -338,6 +340,14 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
return;
}
+ /* Don't try if transport does not support notifiers. */
+ if (!k->set_guest_notifiers || !k->set_host_notifier) {
+ error_setg(errp,
+ "device is incompatible with x-data-plane "
+ "(transport does not support notifiers)");
+ return;
+ }
+
/* If dataplane is (re-)enabled while the guest is running there could be
* block jobs that can conflict.
*/