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Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts
Date: Mon, 23 Nov 2009 15:21:24 +0100
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On 11/23/2009 02:51 PM, Eduardo Habkost wrote:
Right, but I wouldn't be surprised if a user complains that "I know that
my guest don't use that VM feature, so I want to be able to migrate to
an older version anyway".

That's a bit more tricky. What if the older version doesn't support sound (just making up an example) and you know that you're not using a client that plays sound, but still the sound card is part of the machine? I think there is no doubt that the migration (or save/restore) should be aborted in that case.

I would not generalize very much, the problem that Dor posed is very specific and probably quite rare. However, it's real.


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