Re: [Qemu-devel] live migration between qemu-kvm 1.0 and 0.15

[Avi Kivity <avi@redhat.com>]

On 03/27/2012 06:39 PM, Anthony Liguori wrote:
>
> So, since we're approaching 1.1, we should really discuss release
> criteria for 1.1 with respect to live migration.  I'd prefer to avoid
> surprises in this release.

Agree strongly.

>
> My expectation is that migration works from:
>
> qemu-1.0 -M 1.0     =>    qemu-1.1 -M 1.1

Why do you expect that?  Maybe you meant -M 1.0 at the end?

> qemu-1.1 -M 1.0     <=    qemu-1.1 -M 1.0
>
> I would expect that migration works from:
>
> qemu-0.15 -M 0.15   =>   qemu-1.1 -M 0.15
>

Ack.

> I'm okay if this fails gracefully:
>
> qemu-1.1 -M 0.15    <=   qemu-0.15 -M 0.15

RHEL has more stringent requirements (going back to its heavily patched
0.12).  I think we should have the infrastructure that allow one to add
the hacks to make this work, even if we don't actually do the compat
work for the release (I think it's fine for qemu to support just one
version going back; and unreasonable to require it to go as far back as
RHEL).

-- 
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