static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOSerial *vser;
    VirtIOSerialPort *port;

    vser = VIRTIO_SERIAL(vdev);
    port = find_port_by_vq(vser, vq);

    if (!port || !port->host_connected) {
        discard_vq_data(vq, vdev);
        return;
    }

    if (!port->throttled) {
        do_flush_queued_data(port, vq, vdev);
        return;
    }
}
static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOSerial *vser;
    VirtIOSerialPort *port;

    vser = VIRTIO_SERIAL(vdev);
    port = find_port_by_vq(vser, vq);

    if (!port || !port->host_connected) {
        discard_vq_data(vq, vdev);
        return;
    }

    if (!port->throttled) {
        do_flush_queued_data(port, vq, vdev);
        return;
    }
}