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

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Date:	Wed, 1 Apr 2015 11:43:46 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/6] virtio_balloon: transitional interface

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.

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?

-- 
MST
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