void virtio_gpu_ctrl_response(VirtIOGPU *g,
                              struct virtio_gpu_ctrl_command *cmd,
                              struct virtio_gpu_ctrl_hdr *resp,
                              size_t resp_len)
{
    size_t s;

    if (cmd->cmd_hdr.flags & VIRTIO_GPU_FLAG_FENCE) {
        resp->flags |= VIRTIO_GPU_FLAG_FENCE;
        resp->fence_id = cmd->cmd_hdr.fence_id;
        resp->ctx_id = cmd->cmd_hdr.ctx_id;
    }
    s = iov_from_buf(cmd->elem.in_sg, cmd->elem.in_num, 0, resp, resp_len);
    if (s != resp_len) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: response size incorrect %zu vs %zu\n",
                      __func__, s, resp_len);
    }
    virtqueue_push(cmd->vq, &cmd->elem, s);
    virtio_notify(VIRTIO_DEVICE(g), cmd->vq);
    cmd->finished = true;
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.