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

[Avi Kivity]

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).

> 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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