linux-kernel - Re: [PATCH v2 1/6] virtio_balloon: transitional interface

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Date:	Wed, 1 Apr 2015 12:22:44 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/6] virtio_balloon: transitional interface

On Wed, 1 Apr 2015 11:43:46 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Wed, Apr 01, 2015 at 07:53:14PM +1030, Rusty Russell wrote:
> > "Michael S. Tsirkin" <mst@...hat.com> writes:
> > > On Wed, Apr 01, 2015 at 02:17:23PM +1030, Rusty Russell wrote:
> > >> I would leave the device *exactly* as is, ugly structure packing and
> > >> all.
> > >
> > > But why?  It's going to be used for years, might as well make it clean?
> > 
> > Because the only spec which currently exists says to do that.
> 
> OK but the only spec which currently exists also says it's a legacy only
> device, so driver must not set VERSION_1.  So surely, we can make minor
> changes when VERSION_1 is set, like we did for other devices.

But we don't plan to replace the other devices, so it makes sense to do
some changes for 1.0.

> 
> Let me post the latest patches I'm working on,
> see what you think then.
> 
> >  We do
> > need a new virtio memballoon spec, but it'll look nothing like this
> > anyway.
> > 
> > Cheers,
> > Rusty.
> 
> I think it's going to have significantly different semantics, too,
> so not much value in making that one work with current
> drivers, right?
> 

So why not just keep virtio-balloon as-is and just specify endianness
etc. for 1.0? Keeps the old drivers going without hacks, and we can
start with a fresh driver for the new virtio-balloon.

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