virtio_find_single_vq
vi->vq = virtio_find_single_vq(vdev, random_recv_done, "input");
vi->vq = virtio_find_single_vq(vdev, virtio_i2c_msg_done, "msg");
struct virtqueue *vq = virtio_find_single_vq(vdev,
cfv->vq_tx = virtio_find_single_vq(vdev, cfv_release_cb, "output");
vpmem->req_vq = virtio_find_single_vq(vpmem->vdev,
vq = virtio_find_single_vq(priv->vdev, virtio_spi_msg_done, "spi-rq");
vq = virtio_find_single_vq(vm->vdev, virtio_mem_handle_response,
chan->vq = virtio_find_single_vq(vdev, req_done, "requests");