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From: | Paolo Bonzini |
Subject: | [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate |
Date: | Wed, 15 Dec 2010 18:12:25 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.12) Gecko/20101103 Fedora/1.0-0.33.b2pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.6 |
On 12/15/2010 11:00 AM, Michael S. Tsirkin wrote:
Indeed, subsections are for data that is rarely needed so that there's some chance (sometimes ~100%) of migration working seemlessly.If a subsection arrives that qemu does not know about, won't migratin fail?
Yes, that's why rarely needed => some high chance of migration working (though no certainty).
In this case it's either no-bump-and-live-with-the-consequences, or changing the version id.This was discussed to death already. version ids have the problem that they don't play nicely with downstreams.
Downstream version bumps don't play nicely with upstream, so downstream does have a reason for always-necessary subsections. But upstream can bump the version id as much as they care.
Paolo
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