Re: [PATCH] virtio-blk: support polling I/O

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On Sat, Mar 12, 2022 at 12:28:32AM +0900, Suwan Kim wrote:
> diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h
> index d888f013d9ff..3fcaf937afe1 100644
> --- a/include/uapi/linux/virtio_blk.h
> +++ b/include/uapi/linux/virtio_blk.h
> @@ -119,8 +119,9 @@ struct virtio_blk_config {
>  	 * deallocation of one or more of the sectors.
>  	 */
>  	__u8 write_zeroes_may_unmap;
> +	__u8 unused1;
>  
> -	__u8 unused1[3];
> +	__virtio16 num_poll_queues;
>  } __attribute__((packed));

Same as any virtio UAPI change, this has to go through the virtio TC.
In particular I don't think gating a new config field on
an existing feature flag is a good idea.

>  /*
> -- 
> 2.26.3

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