Re: [Xen-devel] [RFC] Enabling live-migrate on HVM on qemu-xen device model

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-12-13 at 15:06 +0000, Alex Bligh wrote:
> But beyond that, my concern is that Xen-4.3 is (as advertised) going
> to have qemu-xen as the default device model; no one needing HVM
> can currently use it at all (if they need live migrate which I guess
> most do). That's a bit of a jump.

> Xen docs currently same qemu-xen is supported. Nowhere does it say
> "save under HVM you can't live migrate". I'd argue lack of live migration
> for HVM *is* a bug.

It's definitely at least a bug in the documentation -- this isn't a
feature which was forgotten about, it was explicitly decided hadn't met
the 4.2 deadline and wasn't going to be ready in time to wait for. This
should have been documented and in the release notes etc, sorry.

We did at least manage to tag it tech preview in
http://wiki.xen.org/wiki/Xen_Release_Features which implies that it is
not yet fully formed.

> If you ignore the JSON stuff, the patch is quite small. We could always
> only enable it as a compile option...



Ian.




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