[libvirt] [PATCH]: Implement Qemu/KVM live migration
Daniel Veillard
veillard at redhat.com
Wed Nov 12 08:29:12 UTC 2008
On Tue, Nov 11, 2008 at 10:11:40PM +0000, Daniel P. Berrange wrote:
> On Thu, Nov 06, 2008 at 03:10:29PM +0100, Chris Lalancette wrote:
> > All,
> > Attached is a patch to implement Qemu/KVM live migration in libvirt. Now
> > that upstream Qemu has settled on an interface that is friendly to libvirt (i.e.
> > one that doesn't block the monitor on -incoming), we can implement it here.
> > Note that the bulk of this patch was written by Rich Jones quite a while ago.
> > My hand in it has mostly been to forward port it to current libvirt CVS, tweak
> > it for the new Qemu style, and test it out with a recent KVM (kvm-78, in
> > particular).
> > Note that there is a FIXME in the code. When testing this out with kvm-78,
> > I found that if I let the source side kill the source VM immediately after the
> > "migrate" monitor command completed, the migration to the destination would
> > never complete. This seems to be a bug in Qemu; the migrate monitor command
> > shouldn't return until the migrate is really, truly complete. I'm posting this
> > now so I can get reviews, and start to address review comments while I try to
> > figure out what's going on with Qemu. With my temporary hack of the sleep()
> > call in there, though, I was able to successfully live migrate an F-9 guest
> > between two machines.
> >
> > Signed-off-by: Chris Lalancette <clalance at redhat.com>
>
> Now that the QEMU bug is fixed, I'm inclined to say we should commit this
> migration support - minus the sleep(5) of course. It is well overdue to
> have migration in the QEMU driver, and oVirt guys have sanity checked its
> implementation in their developemnt, so shouldn't be any surprises.
Agreed, +1
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel at veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
More information about the libvir-list
mailing list