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

[Anthony Liguori]

On 03/27/2012 11:46 AM, Avi Kivity wrote:
> 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?

Sorry, I did mean -M 1.0.

> > 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).

This is reasonable to me.

Regards,

Anthony Liguori

>