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

[Peter Lieven]

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.


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Mit freundlichen Grüßen/Kind Regards

Peter Lieven

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