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[Qemu-devel] Re: The State of the SaveVM format
From: |
Juan Quintela |
Subject: |
[Qemu-devel] Re: The State of the SaveVM format |
Date: |
Wed, 09 Sep 2009 11:22:50 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) |
"Michael S. Tsirkin" <address@hidden> wrote:
> On Wed, Sep 09, 2009 at 10:47:27AM +0200, Juan Quintela wrote:
>> More problems: Going from newer versions to old versions
>> - I think that everybody thinks that this is a nice to have, but that it
>> will took a lot to make it work, and there are more urgent things to
>> do.
>
> It's actually easy if you make whatever is new in the new version an
> optional feature. Then to save in an old format, qemu is started with
> the feature disabled.
That only works if invariants are maintained. That is not true in
general. And furthermore, you are deciding that if you find a bug, and
fix needs a new field -> just live with the bug. If you can recreate
the state without the new field, then _why_ did you added it in the 1st place?
Later, Juan.