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Date: Tue, 22 Jul 2014 18:17:17 +0530
From: Amit Shah <amit.shah@redhat.com>
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Subject: Re: [Qemu-devel] Live migrate,
 inconsistent machine types - new machine type to fix?
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To: Alex Bligh <alex@alex.org.uk>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On (Tue) 22 Jul 2014 [13:19:43], Alex Bligh wrote:
> 
> On 22 Jul 2014, at 13:12, Paolo Bonzini <pbonzini@redhat.com> wrote:
> 
> > There's something similar going on with PIIX4_PM but I don't remember
> > the details.
> 
> From memory:
> 
> * qemu-1.0 uses the v2 format
> * qemu-kvm-1.0 uses the v3 format but advertises itself as v2
> * qemu-2.1 uses the v3 format

Yea; I vaguely recall that happening.  Quite unfortunate.

> I don't quite understand whether Amit's checker is designed to pick
> up all three situations as different, or whether it (quite reasonably)
> expects people to play ball with version numbers.

This is what it says:

Section "PIIX4_PM" Section "PIIX4_PM" Description "piix4_pm": minimum version error: 2 < 3


Which means qemu-2.1 expects a minimum version of 3, but qemu-kvm-1.0
is sending it version 2.  Now even though they may be compatible,
version-number-wise they're not, as the dest qemu will also complain
about.

		Amit