linux-kernel - Re: [PATCH] x86: use PCI method for enabling AMD extended config space before MSR method

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Message-ID: <20110106172834.GN4739@erda.amd.com>
Date:	Thu, 6 Jan 2011 18:28:34 +0100
From:	Robert Richter <robert.richter@....com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"Roedel, Joerg" <Joerg.Roedel@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: use PCI method for enabling AMD extended config
 space before MSR method

On 06.01.11 18:20:04, Robert Richter wrote:
> On 06.01.11 11:57:35, Jan Beulich wrote:
> > While both methods should work equivalently well for the native case,
> > the Xen Dom0 case can't reliably work with the MSR one, since there's
> > no guarantee that the virtual CPUs it has available fully cover all
> > necessary physical ones.
> > 
> > As per the suggestion of Robert Richter the patch only adds the PCI
> > method, but leaves the MSR one as a fallback to cover new systems the
> > PCI IDs of which may not have got added to the code base yet.
> > 
> > Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> > Cc: Robert Richter <robert.richter@....com>
> > Cc: Joerg Roedel <Joerg.Roedel@....com>
> > Cc: Andreas Herrmann <Andreas.Herrmann3@....com>
> > Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> > 
> > ---
> >  arch/x86/include/asm/amd_nb.h |    7 ++++++
> >  arch/x86/kernel/amd_nb.c      |    7 ++++++
> >  arch/x86/kernel/aperture_64.c |   44 +++++++++++++++---------------------------
> >  arch/x86/pci/amd_bus.c        |   30 ++++++++++++++++++++++++++++
> >  4 files changed, 60 insertions(+), 28 deletions(-)

Btw, the patch should be relative to tip/x86/amd-nb as there would be
conflicts otherwise due to other changes.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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