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

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] Re: Live migration protocol, device features, ABIs and other beasts
Date: Wed, 25 Nov 2009 15:10:16 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Lightning/1.0pre Thunderbird/3.0b4


Doesn't work.  If you have a qemu 0.11 machine, a virtio nic and your
guest uses MSI-X you simply can't migrate to qemu 0.10.  End of story.
If you want to be able to migrate to 0.10 you have to start in 0.10
compat mode with MSI-X disabled.  So IMHO it does makes sense to tie the
savevm format to -M pc-<version>.


MSI-X is an orthogonal issue, let's not mix it in.

It isn't. I was making that point with feature=MSI-X. The same argument is true for any other feature: If $feature is new in qemu $newversion and you are using it you can't migrate to qemu $oldversion which hasn't $feature. The versioned machine types turn $feature in $newversion, so migration to $oldversion could work.


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