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Re: [Xen-devel] Re: [Qemu-devel] [PATCH 0/7] merge some xen bits into qe

From: Samuel Thibault
Subject: Re: [Xen-devel] Re: [Qemu-devel] [PATCH 0/7] merge some xen bits into qemu
Date: Wed, 6 Aug 2008 13:50:55 +0100
User-agent: Mutt/1.5.12-2006-07-14

Markus Armbruster, le Wed 06 Aug 2008 08:43:49 -0400, a écrit :
> It *is* quite move, becauses it accomplishes a lot: it goes from a
> heavily modified fork of an oldish version all the way to merge with
> upstream, as far as PV is concerned.

Then why doing it in qemu before having it tested in the xen unstable
tree?  That's not the way I usually see merging happen.

> For what it's worth, I went over significant parts of Gerd's patch
> (all the generic stuff + pvfb) with a fine comb, comparing it to what
> we have now.  I consider it sound.

I'm not saying it's not fine.  I had a look and the code looked fine
indeed.  But what I'm afraid of is the delta with Ian would have to
bear when merging: is it save/restore safe, does it work with PCI
pass-through, VT-D, etc.?

> If that's where we want to go, we can of course still argue whether we
> should go in leaps or baby steps, and whether Gerd's leap lands in
> quite the right spot.

Baby steps are much easier to review.  That's how things are usually
done, and here it looks to me like it is feasible to achieve in Xen (and
have it tested) before event thinking about importing a pile of code in
qemu where it won't receive as much testing as the xen-unstable tree


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