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Date: Tue, 08 Jun 2010 15:28:22 +0200
From: Peter Lieven <pl@dlh.net>
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Subject: [Qemu-devel] Re: Live Migration of 32-bit Linux guest broken
	since	2.6.35-rc2
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To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org

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).
do you have a guideline which flags should be identical to ensure proper 
live migration?
i would like to do an automatic compare before life migration to avoid 
crashes.

thanks
peter

>
>> 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

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