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Re: [Xen-devel] Re: [Qemu-devel] [PATCH 1/2] xenner: add event channel i

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Qemu-devel] [PATCH 1/2] xenner: add event channel implementation.
From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Date: Tue, 26 Aug 2008 09:39:41 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Gerd Hoffmann <kraxel@xxxxxxxxxx>, Anthony Liguori <anthony@xxxxxxxxxxxxx>, qemu-devel@xxxxxxxxxx
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Reply-to: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
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On Mon, Aug 25, 2008 at 07:42:36PM +0100, Keir Fraser wrote:
> On 25/8/08 18:57, "Anthony Liguori" <anthony@xxxxxxxxxxxxx> wrote:
> > Keir Fraser wrote:
> >> On 25/8/08 15:15, "Anthony Liguori" <anthony@xxxxxxxxxxxxx> wrote:
> >> 
> >> With regard to this Xenner patch series, I don't think we have a strong
> >> opinion. The changes are not particularly relevant to us. As long as the
> >> orthogonal qemu-on-xen modes that we *do* care about can coexist happily
> >> alongside, we'll be happy.
> > 
> > Sorry, I was actually referring to the other qemu-dm PV domain support
> > patch series.  That's the one that I'm looking for input from ya'll on.
> > Now that 3.3.0 has been released, it should be possible for you guys to
> > consider merging the patches into qemu-dm, right?
> We'll certainly be sync'ing with upstream qemu now, yes. I'm not sure what
> Ian Jackson's plans are with regard to Gerd's patches. I think he was hoping
> that Gerd would post patches to xen-devel against his tree (being an
> existing and actively maintained and tested Xen patchset) and then we would
> from there submit to upstream. Afaics there's some workflow or patchflow to
> be worked out here: I can't see why we would take Gerd's patches wholesale
> when we have a working patchset already.

The core benefit of this new patchset is increased featureset. The current
Xen fork of QEMU only works for running Xen VMs ontop of the Xen hypervisor,
when invoked by XenD. The new patchset should  support this existing use 
case, but in addition allow running of Xen VMs ontop of the Xen hypervisor,
*without* needing XenD, and also allow running of Xen VMs ontop of KVM 
using Xenner. Supporting all three of those use cases with a codebase that
is in mainline QEMU would be a significant improvement over the existing
patchset both in terms of features & reduced support burden for people
developing and distributing Xen/QEMU.

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