Re: [Xen-devel] rhel6 guest fail to do save?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 13, 2011 at 04:22:36PM -0500, Don Dutile wrote:
> Pasi Kärkkäinen wrote:
> > On Thu, Jan 13, 2011 at 07:36:02AM +0000, Ian Campbell wrote:
> >> On Wed, 2011-01-12 at 17:16 +0000, Ian Jackson wrote: 
> >>> Zhang, Yang Z writes ("RE: [Xen-devel] rhel6 guest fail to do save?"):
> >>>> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> >>>>> I think people have generally been able to save/restore with rhel6,
> >>>>> but there are some issues with live migration between different MHz 
> >>>>> CPUs,
> >>>>> for example: https://bugzilla.redhat.com/show_bug.cgi?id=663755
> >>> ...
> >>>> Sorry, I mean the HVM.
> >>> This is known not to work.  It fails in my automatic tests.
> >>>
> >>> The current RHEL6 kernel has enough pv-on-hvm drivers to get the
> >>> toolstack to try to negotiate with the guest during save, but not
> >>> enough (or not working enough) drivers to actually complete the
> >>> negotiation.  So the toolstack times out and the migrate/save fails.
> >> Does any of the pv-on-hvm functionality work at all in RHEL6?
> >>
> >> Perhaps setting "platform_pci = 0" in the guest configuration would work
> >> around this issue? In particular if RHEL6 has no useful pv-on-hvm
> >> functionality in the first place then nothing is lost.
> >>
> > 
> > RHEL6 is supposed to have working PV-on-HVM drivers,
> > based on Stefano's patches.
> > 
> > Redhat has tested them with RHEL5 dom0, afaik.
> > 
> Correct. xen-emul-unplug doesn't work, though, due to late
> patch that broke that bit of it.
> A fair number of upstream patches for pv-hvm & save/restore
> have been backported to the next rhel6 update, so hoping this
> state of missing pieces in rhel6 pv-on-hvm will be short-lived.
> oh, added benefit: the patches should improve rhel6 (pv-on)hvm
> on non-RHEL5 dom0's as well.
> 

Great! Thanks for the reply!

-- Pasi


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