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> -----Original Message-----
> From: Daniel P. Berrange [mailto:berrange at redhat.com]
> Sent: Wednesday, March 4, 2015 9:56 AM
> To: Jiang, Yunhong
> Cc: openstack-dev at lists.openstack.org; Xu, Hejie
> Subject: Re: [nova][libvirt] The None and 'none' for CONF.libvirt.cpu_mode
> 
> On Wed, Mar 04, 2015 at 05:24:53PM +0000, Jiang, Yunhong wrote:
> > Daniel, thanks for your clarification.
> >
> > Another related question is, what will be the guest's real cpu model
> > is the cpu_model is None? This is about a reported regression at
> 
> The guest CPU will be unspecified - it will be some arbitrary
> hypervisor decided default which nova cannot know.
> 
> > https://bugs.launchpad.net/nova/+bug/1082414 . When the
> > instance.vcpu_model.mode is None, we should compare the source/target
> > cpu model, as the suggestion from Tony, am I right?
> 
> If CPU model is none, best we can do is compare the *host* CPU of
> the two hosts to make sure the host doesn't loose any features, as
> we have no way of knowing what features the guest is relying on.

Thanks for clarification. I will cook a patch for this issue.

--jyh

> 
> Regards,
> Daniel
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