virtio_vdpa: support the arg sizes of find_vqs()

Virtio vdpa support the new parameter sizes of find_vqs().
Signed-off-by: Bo Liu <liubo03@inspur.com>
Message-Id: <20220810085151.7251-1-liubo03@inspur.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/virtio/virtio_vdpa.c

@@ -131,7 +131,7 @@ static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
 static struct virtqueue *
 virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		     void (*callback)(struct virtqueue *vq),
-		     const char *name, bool ctx)
+		     const char *name, u32 size, bool ctx)
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
@@ -168,14 +168,17 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		goto error_new_virtqueue;
 	}
 
+	if (!size || size > max_num)
+		size = max_num;
+
 	if (ops->get_vq_num_min)
 		min_num = ops->get_vq_num_min(vdpa);
 
-	may_reduce_num = (max_num == min_num) ? false : true;
+	may_reduce_num = (size == min_num) ? false : true;
 
 	/* Create the vring */
 	align = ops->get_vq_align(vdpa);
-	vq = vring_create_virtqueue(index, max_num, align, vdev,
+	vq = vring_create_virtqueue(index, size, align, vdev,
 				    true, may_reduce_num, ctx,
 				    virtio_vdpa_notify, callback, name);
 	if (!vq) {
@@ -285,9 +288,9 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 			continue;
 		}
 
-		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
-					      callbacks[i], names[i], ctx ?
-					      ctx[i] : false);
+		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++, callbacks[i],
+						  names[i], sizes ? sizes[i] : 0,
+						  ctx ? ctx[i] : false);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto err_setup_vq;