Re: [Xen-devel] Re: Xen-unstable save error

[Michal Novotny <minovotn@xxxxxxxxxx>]

On 06/22/2010 12:01 PM, Keir Fraser wrote:
> On 22/06/2010 07:48, "Jan Beulich"<JBeulich@xxxxxxxxxx>  wrote:
>
>    
> > > > > On 22.06.10 at 08:23, Michal Novotny<minovotn@xxxxxxxxxx>  wrote:
> > > > >            
> > > Jan, as we were solving this with Keir on the list I was unable to save
> > > the HVM guest properly and reverting your c/s 21615 helped and with your
> > > patch reverted it was working fine. Any idea why there were so type
> > > failures for all the pages of HVM guest?
> > >        
> > Not really, and I think you will need to find out by instrumenting the
> > hypercall implementation (XEN_DOMCTL_getpageframeinfo{2,3}) -
> > really, type failures should only happen for grant frames and I/O
> > memory pages (as you can see in the code, for the function to
> > report XTAB either the MFN must be invalid, must be a Xen frame,
> > or it must be impossible to obtain a reference to the page - all of
> > which shouldn't hold for the majority of a HVM guest's pages).
> >      
> Michal, is it possible you are running new tools against a slightly older
> hypervisor? The tools changes had a corresponding, non-version-checked,
> modification to a hypercall. Without running the modified hypervisor, HVM
> save would indeed behave very oddly!
>
>   -- Keir
>
>
>    
Keir, I don't think so since the hypervisor datetime in /boot is the 
same like for kernel and tools.
Michal

--
Michal Novotny<minovotn@xxxxxxxxxx>, RHCE
Virtualization Team (xen userspace), Red Hat


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