Re: [Xen-devel] Question re live migrate on Xen 4.2 re different cpu capabilities

[Alex Bligh <alex@xxxxxxxxxxx>]

Ian, Olaf,

--On 7 February 2013 09:47:01 +0000 Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
wrote:
> On Thu, 2013-02-07 at 09:19 +0000, Olaf Hering wrote:
> > On Thu, Feb 07, Alex Bligh wrote:
> >
> > > Is there any way to do similarly in Xen? Or is Xen live migrate
> > > effectively restricted to live migrate between identical CPUs?
> >
> > Its mentionend somewhere in the docs that both cpus must be sufficient
> > compatible. Use the cpuid= setting in the domU config file to enforce
> > this.
> You can also level down an entire host using the cpuid_mask_* command
> line options described in
> http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
Thanks - that's really helpful. Looking at the documentation for cpuid=
I can't see an obvious way of saying 'mask everything except the
least common denominator of features' using the libxl method, without
having prior knowledge of what each version of xen supports. I'm not
even clear how to do this on the xend method (obviously I want to
pass long bitstrings of zeros, but how many?). Am I missing something?

--
Alex Bligh

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