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Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER


From: Paul Brook
Subject: Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER
Date: Thu, 28 May 2009 14:20:07 +0100
User-agent: KMail/1.11.2 (Linux/2.6.29-2-amd64; KDE/4.2.2; x86_64; ; )

> > IMHO think the only sane response is "don't do that". Trying to support
> > migration between different qemu versions just isn't worth the pain.
>
> I think that further more, we shouldn't make a change like altering
> the PCI device class in the stable branch, only in the unstable
> branch. If we restrict the stable branch to bug fixes, then it ought
> to be (more?) practical to support save under 0.10 and restore under
> 0.11, without needing to support the hard problem of save under 0.10
> and restore under 1.00 (or whatever next major release branch is)

0.11 is the next major release series. The current stable releases are 0.10.x.
I agree we shouldn't be making this sort of change on the stable branch, 
precisely because it's reasonable to expect stable releases to be backwards 
compatible.

Paul




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