On Fri, May 04, 2018 at 12:59:15PM +0800, Tiwei Bie wrote:
> diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
> index 308e2096291f..9fb519a9df28 100644
> --- a/include/uapi/linux/virtio_config.h
> +++ b/include/uapi/linux/virtio_config.h
> @@ -49,7 +49,7 @@
>   * transport being used (eg. virtio_ring), the rest are per-device feature
>   * bits. */
>  #define VIRTIO_TRANSPORT_F_START	28
> -#define VIRTIO_TRANSPORT_F_END		34
> +#define VIRTIO_TRANSPORT_F_END		37

Have you updated "2.2 Feature Bits" in the VIRTIO spec?

In 1.0 it says:

 24 to 32
    Feature bits reserved for extensions to the queue and feature negotiation mechanisms

This information is out-of-date.

Stefan