Hello! There's one more problem (see inline).
> points to a char device.
> to be uncommented when in use.
> +		rte_panic("%d hugepage files exceed the maximum of %d for "
> +	 * if dev is alive. so finally we need two real event_fds.
> + * Merge those virtually adjacent memsegs into one region.
> +	 * vhost side.
This is a bug. With VHOST_USER hw->backfd is not initialized (i suppose contains 0), and attemting this on stdin does nothing good.
>   * rest are per-device feature bits.