virtio-rng: Wrap in vmstate

Forcibly convert it to a vmstate wrapper;  proper conversion
comes later.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/virtio-rng.c

@@ -120,22 +120,12 @@ static uint64_t get_features(VirtIODevice *vdev, uint64_t f, Error **errp)
     return f;
 }
 
-static void virtio_rng_save(QEMUFile *f, void *opaque)
-{
-    VirtIODevice *vdev = opaque;
-
-    virtio_save(vdev, f);
-}
-
-static int virtio_rng_load(QEMUFile *f, void *opaque, int version_id)
+static int virtio_rng_load(QEMUFile *f, void *opaque, size_t size)
 {
     VirtIORNG *vrng = opaque;
     int ret;
 
-    if (version_id != 1) {
-        return -EINVAL;
-    }
-    ret = virtio_load(VIRTIO_DEVICE(vrng), f, version_id);
+    ret = virtio_load(VIRTIO_DEVICE(vrng), f, 1);
     if (ret != 0) {
         return ret;
     }
@@ -214,8 +204,6 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
     vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                                check_rate_limit, vrng);
     vrng->activate_timer = true;
-    register_savevm(dev, "virtio-rng", -1, 1, virtio_rng_save,
-                    virtio_rng_load, vrng);
 }
 
 static void virtio_rng_device_unrealize(DeviceState *dev, Error **errp)
@@ -225,10 +213,11 @@ static void virtio_rng_device_unrealize(DeviceState *dev, Error **errp)
 
     timer_del(vrng->rate_limit_timer);
     timer_free(vrng->rate_limit_timer);
-    unregister_savevm(dev, "virtio-rng", vrng);
     virtio_cleanup(vdev);
 }
 
+VMSTATE_VIRTIO_DEVICE(rng, 1, virtio_rng_load, virtio_vmstate_save);
+
 static Property virtio_rng_properties[] = {
     /* Set a default rate limit of 2^47 bytes per minute or roughly 2TB/s.  If
      * you have an entropy source capable of generating more entropy than this
@@ -246,6 +235,7 @@ static void virtio_rng_class_init(ObjectClass *klass, void *data)
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 
     dc->props = virtio_rng_properties;
+    dc->vmsd = &vmstate_virtio_rng;
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     vdc->realize = virtio_rng_device_realize;
     vdc->unrealize = virtio_rng_device_unrealize;