Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2

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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.



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Mit freundlichen Grüßen/Kind Regards

Peter Lieven

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