virtio: new post_load hook
Post load hook in virtio vmsd is called early while device is processed,
and when VirtIODevice core isn't fully initialized. Most device
specific code isn't ready to deal with a device in such state, and
behaves weirdly.
Add a new post_load hook in a device class instead. Devices should use
this unless they specifically want to verify the migration stream as
it's processed, e.g. for bounds checking.
Cc: qemu-stable@nongnu.org
Suggested-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mikhail Sennikovsky <mikhail.sennikovskii@cloud.ionos.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 527df03..54a46e2 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2291,6 +2291,13 @@
}
rcu_read_unlock();
+ if (vdc->post_load) {
+ ret = vdc->post_load(vdev);
+ if (ret) {
+ return ret;
+ }
+ }
+
return 0;
}
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 48e8d04..ca4f9c0 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -158,6 +158,12 @@
*/
void (*save)(VirtIODevice *vdev, QEMUFile *f);
int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
+ /* Post load hook in vmsd is called early while device is processed, and
+ * when VirtIODevice isn't fully initialized. Devices should use this instead,
+ * unless they specifically want to verify the migration stream as it's
+ * processed, e.g. for bounds checking.
+ */
+ int (*post_load)(VirtIODevice *vdev);
const VMStateDescription *vmsd;
} VirtioDeviceClass;
