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

[Olaf Hering <olaf@xxxxxxxxx>]

On Fri, Feb 08, Konrad Rzeszutek Wilk wrote:

> I recall seeing that libvirt had some of this figured out. It would
> know which CPUID flags each CPU family had - and you could actually
> set ('I am a Westmere CPU') or it would use the lowest common CPU
> family support for all the guest.
> 
> Granted that means you need to know _which_ of the machines has the
> lowest common CPU family first. Or you set the guest to say 'Core' .
> 
> Anyhow, perhaps looking at libvirt and implementing something similar
> in 'xl' would be beneficial for these issues?

I havent looked at the code, but I can imagine it does that via qemu.
But it would be nice thing to have proper cpuid= handling were libvirt
can force a certain cpu type.

Olaf

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