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

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.

> -- Pasi
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