linux-kernel - Re: [PATCH v8 09/19] virtio: stop using legacy struct vring in kernel

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Message-ID: <20200407085123.GA247777@stefanha-x1.localdomain>
Date:   Tue, 7 Apr 2020 09:51:23 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v8 09/19] virtio: stop using legacy struct vring in kernel

On Mon, Apr 06, 2020 at 09:16:46PM -0400, Michael S. Tsirkin wrote:
> struct vring (in the uapi directory) and supporting APIs are kept
> around to solely avoid breaking old userspace builds.
> It's not actually part of the UAPI - it was kept in the UAPI
> header by mistake, and using it in kernel isn't necessary
> and prevents us from making changes safely.
> In particular, the APIs actually assume the legacy layout.
> 
> Add an internal kernel-only struct vring and
> switch everyone to use that.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/block/virtio_blk.c       |  1 +
>  include/linux/virtio.h           |  1 -
>  include/linux/virtio_ring.h      | 10 ++++++++++
>  include/linux/vringh.h           |  1 +
>  include/uapi/linux/virtio_ring.h | 26 ++++++++++++++++----------
>  5 files changed, 28 insertions(+), 11 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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