linux-kernel - Re: x86, amd: Get multi-node CPU info from NodeId MSR instead of PCI config space

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Message-ID: <20091016130000.GC24518@elte.hu>
Date:	Fri, 16 Oct 2009 15:00:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <herrmann.der.user@...glemail.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: x86, amd: Get multi-node CPU info from NodeId MSR instead of
	PCI config space


* Andreas Herrmann <herrmann.der.user@...glemail.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?

	Ingo
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