Re: [Xen-devel] [PATCH v2 0/3] VPMU fixes

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Thursday, December 03, 2015 6:36 PM
> 
> >>> On 03.12.15 at 07:16, <kevin.tian@xxxxxxxxx> wrote:
> >>  From: Dietmar Hahn [mailto:dietmar.hahn@xxxxxxxxxxxxxx]
> >> Sent: Wednesday, December 02, 2015 5:21 PM
> >>
> >> Am Mittwoch 02 Dezember 2015, 02:20:49 schrieb Tian, Kevin:
> >> > > From: Boris Ostrovsky [mailto:boris.ostrovsky@xxxxxxxxxx]
> >> > > Sent: Wednesday, December 02, 2015 12:50 AM
> >> > >
> >> > > * Limit VPMU support to PMU versions 2, 3 and 4 (emulated at version 3 
> >> > > level)
> >> > > * Always implement family 6 VPMU quirk.
> >> > >   ==>  Intel folks: is the quirk needed for all family 6 processors or 
> >> > > can we
> >> > >                     limit it to certain models?
> >> >
> >> > Let me confirm this information internally. btw could you provide a link
> >> > where you find out the original quirk information?
> >>
> >> http://old-list-archives.xenproject.org/xen-devel/2010-11/msg01157.html
> >> Dietmar.
> >
> > Looks there's no formal errata recorded from original thread. Since the
> > patch sustains original behavior, I'm OK with this assumption.
> 
> Except that the Link Dietmar provided makes it even more
> likely that this could be limited to certain models (since in that
> original patch version it covered just two). See also the vague
> statement in 75a92f551a ("Currently only a few Intel models
> have VPMU workaround turned on. It").
> 

Well, I'm not sure about the whole history. If you look at Boris's
patch, the code already assumes quirk for all family 6 before his
change. 

Thanks
Kevin

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