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

[Avi Kivity]

On 06/08/2010 04:28 PM, Peter Lieven wrote:
> > > 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.

All of them [1].  If you have an asymmetric machine, you can disable 
those flags with the -cpu switch.

Note the default qemu cpu disables many flags, so if one machine has 
sse4.2 and the other doesn't, migration will still work without 
disabling anything.


[1] Rather, all flags understood by qemu and kvm that are enabled by the 
cpu model that you gave to qemu with -cpu.

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