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Re: [Qemu-devel] [PATCH 06/10] parallel: adding vmstate for save/restore
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 06/10] parallel: adding vmstate for save/restore |
Date: |
Wed, 10 Sep 2014 15:09:01 +0300 |
On Tue, Sep 09, 2014 at 03:40:07PM +0200, Paolo Bonzini wrote:
> Il 09/09/2014 15:32, Juan Quintela ha scritto:
> > This breaks migration with old machine type, but as far as I can see,
> > parallel is only added when used, and if we are using it, we need this,
> > right?
>
> Yes.
Presumably, your next statement means that guests can typically recover
if parallel state is discarded in migration?
> But again, it only breaks backwards migration, which is not
> supported upstream.
>
> Paolo
Upstream doesn't provide support for old versions period.
We do our best to make it easy for downstreams to support
cross version migration and they care about both direction,
so I don't see why make an exception here.
So if guests can recover, it seems worth it to
stay bug for bug compatible for old machine types.
> > If my understanding is correct:
> >
> > Acked-by: Juan Quintela <address@hidden>
> >
>
- Re: [Qemu-devel] [PATCH 01/10] vl: use QLIST_FOREACH_SAFE to visit change state handlers, (continued)
[Qemu-devel] [PATCH 06/10] parallel: adding vmstate for save/restore, Paolo Bonzini, 2014/09/09
[Qemu-devel] [PATCH 05/10] fdc: adding vmstate for save/restore, Paolo Bonzini, 2014/09/09
[Qemu-devel] [PATCH 07/10] serial: fixing vmstate for save/restore, Paolo Bonzini, 2014/09/09
Re: [Qemu-devel] [PATCH 07/10] serial: fixing vmstate for save/restore, Paolo Bonzini, 2014/09/10
[Qemu-devel] [PATCH 08/10] pckbd: adding new fields to vmstate, Paolo Bonzini, 2014/09/09