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Date: Fri, 16 Oct 2009 15:05:10 +0200
From: Andreas Herrmann <herrmann.der.user@googlemail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       linux-kernel@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: Re: x86, amd: Get multi-node CPU info from NodeId MSR instead of
 PCI config space
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On Fri, Oct 16, 2009 at 03:00:00PM +0200, Ingo Molnar wrote:
> 
> * Andreas Herrmann <herrmann.der.user@googlemail.com> wrote:
> 
> > > are there any such CPUs?
> > 
> > Only Magny-Cours so far.
> > 
> > > I.e. we want to know the effect of this patch on various models of 
> > > AMD CPUs - is the change really .32 safe? Does it solve any problem 
> > > that makes it .32 material versus being for .33?
> > 
> > IMHO getting rid of the PCI config space accesses as soon as possible 
> > is a benefit, I think.
> 
> Agreed.
> 
> Is the patch an identity transformation? Or are there CPUs where the 
> information from the PCI config space is different from the MSR derived 
> one?

On production hardware it's an identity transformation.


Regards,
Andreas