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

[Greg Kurz]

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

Cheers,

--
Greg

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