linux-kernel - Re: [PATCH RFC 3/3] virtio_ccw: rev 1 devices set VIRTIO_F_VERSION

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Date:	Thu, 4 Dec 2014 20:15:12 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	virtualization@...ts.linux-foundation.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org
Subject: Re: [PATCH RFC 3/3] virtio_ccw: rev 1 devices set VIRTIO_F_VERSION_1

On Thu, Dec 04, 2014 at 06:59:14PM +0100, Cornelia Huck wrote:
> On Thu, 4 Dec 2014 19:26:50 +0200
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
> 
> > What does it mean if rev 1 device does not set
> > VIRTIO_F_VERSION_1? E.g. is it native endian?
> > 
> > Let's not even try to drive such devices:
> > skip attempts to finalize features or set status.
> 
> Why not set status_failed?

It might be cleanest to just teach core that finalize_features
can fail.
I'll look into this.

> > virtio core will detect this and bail out.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  drivers/s390/kvm/virtio_ccw.c | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> > 
> 
> I'm not sure yet whether I like this approach. I'll think about it over
> the weekend.
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