linux-kernel - Re: [PATCH v2 17/24] virtio_config: disallow native type fields

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Date:   Tue, 4 Aug 2020 16:50:39 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 17/24] virtio_config: disallow native type fields

On Mon, 3 Aug 2020 16:59:57 -0400
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> Transitional devices should all use __virtioXX types.

I think they should use __leXX for those fields that are not present
with legacy devices?

> Modern ones should use __leXX.
> _uXX type would be a bug.
> Let's prevent that.

That sounds right, though.

> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/linux/virtio_config.h | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index 64da491936f7..c68f58f3bf34 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -319,9 +319,8 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
>  	__virtio_pick_type(x, __u8, __u8,					\
>  		__virtio_pick_endian(x, __virtio16, __virtio32, __virtio64,	\
>  			__virtio_pick_endian(x, __le16, __le32, __le64,		\
> -				__virtio_pick_endian(x, __u16, __u32, __u64,	\
> -					/* No other type allowed */		\
> -					(void)0)))))
> +				/* No other type allowed */			\
> +				(void)0))))
>  
>  #endif
>