virtio-bus: have callers tolerate new host notifier api

Have vhost and dataplane use the new api for transports that
have been converted.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 15 insertions, 5 deletions

diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c
index 1a49f1e4b7..b9a5716501 100644
--- a/hw/scsi/virtio-scsi-dataplane.c
+++ b/hw/scsi/virtio-scsi-dataplane.c
@@ -31,7 +31,8 @@ void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread)
     s->ctx = iothread_get_aio_context(vs->conf.iothread);
 
     /* Don't try if transport does not support notifiers. */
-    if (!k->set_guest_notifiers || !k->set_host_notifier) {
+    if (!k->set_guest_notifiers ||
+        (!k->set_host_notifier && !k->ioeventfd_started)) {
         fprintf(stderr, "virtio-scsi: Failed to set iothread "
                    "(transport does not support notifiers)");
         exit(1);
@@ -73,7 +74,10 @@ static int virtio_scsi_vring_init(VirtIOSCSI *s, VirtQueue *vq, int n,
     int rc;
 
     /* Set up virtqueue notify */
-    rc = k->set_host_notifier(qbus->parent, n, true);
+    rc = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), n, true);
+    if (rc == -ENOSYS) {
+        rc = k->set_host_notifier(qbus->parent, n, true);
+    }
     if (rc != 0) {
         fprintf(stderr, "virtio-scsi: Failed to set host notifier (%d)\n",
                 rc);
@@ -159,7 +163,10 @@ fail_vrings:
     virtio_scsi_clear_aio(s);
     aio_context_release(s->ctx);
     for (i = 0; i < vs->conf.num_queues + 2; i++) {
-        k->set_host_notifier(qbus->parent, i, false);
+        rc = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false);
+        if (rc == -ENOSYS) {
+            k->set_host_notifier(qbus->parent, i, false);
+        }
     }
     k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, false);
 fail_guest_notifiers:
@@ -174,7 +181,7 @@ void virtio_scsi_dataplane_stop(VirtIOSCSI *s)
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s)));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
-    int i;
+    int i, rc;
 
     if (!s->dataplane_started || s->dataplane_stopping) {
         return;
@@ -198,7 +205,10 @@ void virtio_scsi_dataplane_stop(VirtIOSCSI *s)
     aio_context_release(s->ctx);
 
     for (i = 0; i < vs->conf.num_queues + 2; i++) {
-        k->set_host_notifier(qbus->parent, i, false);
+        rc = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false);
+        if (rc == -ENOSYS) {
+            k->set_host_notifier(qbus->parent, i, false);
+        }
     }
 
     /* Clean up guest notifier (irq) */