Re: Re: Xen-unstable save error

[Michal Novotny <minovotn@redhat.com>]

On 06/22/2010 12:01 PM, Keir Fraser wrote:
> On 22/06/2010 07:48, "Jan Beulich"<JBeulich@novell.com>  wrote:
>
>    
>>>>> On 22.06.10 at 08:23, Michal Novotny<minovotn@redhat.com>  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@redhat.com>, RHCE
Virtualization Team (xen userspace), Red Hat