Re: [Xen-devel] Is: cpuid creation of PV guests is not correct. Was:Re: [PATCH v6 00/10] vnuma introduction

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2014-07-22 at 15:43 -0400, Konrad Rzeszutek Wilk wrote:
> > I.e., no matter how I pin the vcpus, the guest sees the 4 vcpus as if
> > they were all SMT siblings, within the same core, sharing all cache
> > levels.
> 
> My recollection was that the setting of these CPUID values is
> tied in how the toolstack sees it - and since the toolstack
> runs in the initial domain - that is where it picks this data up.
> 
> This problem had been discussed by Andrew Cooper at some point
> (Hackathon? Emails? IRC?) and moved under the 'fix cpuid creation/parsing'.
> 
> I think that this issue should not affect Elena's patchset - 
> as the vNUMA is an innocent bystander that gets affected by this.
> 
Agreed. Let's live with the WARN for now or, if that is annoying (e.g.
for testing/benchmarking) with whatever (local!) hack one needs.

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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