virtqueue_enable_cb_prepare
msg->poll_idx = virtqueue_enable_cb_prepare(vioch->vqueue);
msg->poll_idx = virtqueue_enable_cb_prepare(vioch->vqueue);
opaque = virtqueue_enable_cb_prepare(sq->vq);
opaque = virtqueue_enable_cb_prepare(vq);
EXPORT_SYMBOL_GPL(virtqueue_enable_cb_prepare);
unsigned int last_used_idx = virtqueue_enable_cb_prepare(_vq);
unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);