linux-kernel - Re: [PATCH] virtio: acknowledge all features before access

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Message-ID: <871r15dl76.fsf@redhat.com>
Date:   Tue, 18 Jan 2022 18:10:05 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Halil Pasic <pasic@...ux.ibm.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] virtio: acknowledge all features before access

On Tue, Jan 18 2022, "Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Mon, Jan 17, 2022 at 01:38:42PM +0100, Cornelia Huck wrote:
>> On Mon, Jan 17 2022, "Michael S. Tsirkin" <mst@...hat.com> wrote:
>> 
>> > On Mon, Jan 17, 2022 at 02:31:49PM +0800, Jason Wang wrote:
>> >> 
>> >> 在 2022/1/15 上午4:09, Michael S. Tsirkin 写道:
>> >> > @@ -495,6 +494,10 @@ int virtio_device_restore(struct virtio_device *dev)
>> >> >   	/* We have a driver! */
>> >> >   	virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER);
>> >> > +	ret = dev->config->finalize_features(dev);
>> >> > +	if (ret)
>> >> > +		goto err;
>> >> 
>> >> 
>> >> Is this part of code related?
>> >> 
>> >> Thanks
>> >> 
>> >
>> > Yes. virtio_finalize_features no longer calls dev->config->finalize_features.
>> >
>> > I think the dev->config->finalize_features callback is actually
>> > a misnomer now, it just sends the features to device,
>> > finalize is FEATURES_OK. Renaming that is a bigger
>> > patch though, and I'd like this one to be cherry-pickable
>> > to stable.
>> 
>> Do we want to add a comment before the calls to ->finalize_features()
>> (/* write features to device */) and adapt the comment in virtio_ring.h?
>> Should still be stable-friendly, and giving the callback a better name
>> can be a follow-up patch.
>
> Sorry which comment in virtio_ring.h?
> Could not find anything.

Typo; I ment virtio_config.h...

>
>> >
>> >> > +
>> >> >   	ret = virtio_finalize_features(dev);
>> >> >   	if (ret)
>> >> >   		goto err;