Re: [Qemu-devel] [PATCH 0/3] spapr: fix backward migration from POWER9 to POWER8 hosts

[David Gibson]

On Fri, May 04, 2018 at 07:58:21AM +0200, Greg Kurz wrote:
> On Fri, 4 May 2018 10:11:02 +1000
> David Gibson <address@hidden> wrote:
> 
> > On Thu, May 03, 2018 at 11:16:10PM +0200, Greg Kurz wrote:
> > > Hi,
> > > 
> > > It is expected to be able to migrate a guest started with
> > > 
> > >      -machine max-cpu-compat=power8
> > > 
> > > from a POWER9 host to a POWER8 host. It works with recent QEMU versions,
> > > but it is badly broken if the destination runs QEMU 2.7 or older.
> > > 
> > > This can cause problems in cloud environments that still have systems with
> > > older QEMU versions, eg, hosts running ubuntu LTS 16.04.4 (QEMU 2.5) which
> > > are likely to stay around until admins could transition to some newer OS.
> > > 
> > > This series was lightly tested, but the patches are simple enough, so I'm
> > > confident they shouldn't break anything :)
> > > 
> > > Please review as I'd like these to go to QEMU 2.11.2 as well.  
> > 
> > Applied to ppc-for-2.13.  As you say, these should probably go to the
> > 2.12 and 2.11 stable trees too.
> > 
> 
> Cc'ing qemu-stable then

Thanks.  I'm about to go on leave, so I won't be around to shepherd
these into the stable trees any time soon.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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