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

[Avi Kivity]

On 06/08/2010 04:38 PM, Peter Lieven wrote:
> Avi Kivity wrote:
> > 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.
> which cpu model do you suggest for 4 core xeon cpus? -cpu host ?

-cpu host is good if you have identical machines and don't plan to add 
new ones.

> how important is the match of the virtualization extensions?

The virtualization extensions on Intel aren't exposed to the guest, so 
they don't need to match.

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