[Qemu-devel] Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2

[Peter Lieven <pl@dlh.net>]

Avi Kivity wrote:
> On 06/08/2010 03:49 PM, Peter Lieven wrote:
>>>
>>> And finally, perhaps you have NX disabled in the bios of one of the 
>>> machines?
>>>
>>> What does 'dmesg | grep NX' show on both hosts?
>>>
>>
>> nx was disabled on one of the nodes. 
>
> That explains the problem.
>
>> i will retry the case later today and send info register output.
>> what is the recommended value for nx (and why)?
>
> Enabled (so you get no-execute memory protection).
mhh, i am at the moment back to 2.6.34. here i do not see the nx flag in 
the guest
of both 32-bit and 64-bit linux.
>
>> and why was it working with 2.6.34 and is not with 2.6.35-rc2?
>
> We fixed a different bug.  But you shouldn't live migrate from a 
> machine with nx to a machine without nx, unless you use -cpu ...,-nx 
> on both nodes.
>


-- 
Mit freundlichen Grüßen/Kind Regards

Peter Lieven

..........................................................................................................

   KAMP Netzwerkdienste GmbH
   Vestische Str. 89-91 | 46117 Oberhausen
   Tel: +49 (0) 208.89 402-50 | Fax: +49 (0) 208.89 402-40
   mailto:pl@kamp.de | http://www.kamp.de

   Geschäftsführer: Heiner Lante | Michael Lante
   Amtsgericht Duisburg | HRB Nr. 12154
   USt-Id-Nr.: DE 120607556

.........................................................................................................