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Date: Wed, 22 Jun 2016 12:54:32 +0100
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 6/6] hw/arm/virt: Set minimum_page_bits
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Andrew Jones <drjones@redhat.com>, Patch Tracking <patches@linaro.org>, Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>, QEMU Developers <qemu-devel@nongnu.org>, qemu-arm <qemu-arm@nongnu.org>, Paolo Bonzini <pbonzini@redhat.com>

* Peter Maydell (peter.maydell@linaro.org) wrote:
> On 22 June 2016 at 12:35, Dr. David Alan Gilbert <dgilbert@redhat.com> wrote:
> > Yes, my hope is that any versioned machine type should migrate to
> > a newer qemu with the same machine type set.
> >
> > There are really two separate things that we state with the machine
> > versioning:
> >   a) that the guest view is the same
> >   b) that the migration format is the same
> 
> Well, this is true for PC.

PC, ppc/spapr, and I think s390.

> But my impression when we started
> applying versioned machine types to ARM virt was that it was
> signing up to (a) but not (yet) (b)...

So that would make ARM special; the problem is we have no way
to communicate to the user that it's special.

Dave

> 
> thanks
> -- PMM
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK