linux-kernel - Re: [PATCH v3 1/6] virtio_balloon: transitional interface

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Message-ID: <20150401135244.5a8d7ad1.cornelia.huck@de.ibm.com>
Date:	Wed, 1 Apr 2015 13:52:44 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	virtio-dev@...ts.oasis-open.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v3 1/6] virtio_balloon: transitional interface

On Wed, 1 Apr 2015 12:49:02 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Wed, Apr 01, 2015 at 12:35:45PM +0200, Michael S. Tsirkin wrote:
> > Virtio 1.0 doesn't include a modern balloon device.
> > But it's not a big change to support a transitional
> > balloon device: this has the advantage of supporting
> > existing drivers, transparently.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  include/uapi/linux/virtio_balloon.h | 11 ++++++++--
> >  drivers/virtio/virtio_balloon.c     | 43 +++++++++++++++++++++++++++++--------
> >  2 files changed, 43 insertions(+), 11 deletions(-)
> 
> So all in all 32 LOC added, and 9 out of these
> deal with endian-ness differences.
> 
> Seems like a small cost for guests to pay for a clean spec, no?
> 

I'm not opposed to this per se, but I'm not totally convinced of the
usefulness :)

Seeing the qemu side would be helpful.

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