VHOST_TEST_VQ
vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
*privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
vq = &n->vqs[VHOST_TEST_VQ];
struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];