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

[David Gibson]

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.

-- 
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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