linux-kernel - Re: [git-pull -tip V2] x86: msr architecture debug code

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Date:	Thu, 5 Mar 2009 13:21:57 +0100
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip V2] x86: msr architecture debug code

On Thu, Mar 05, 2009 at 02:19:56AM +0530, Jaswinder Singh Rajput wrote:
> On Thu, 2009-03-05 at 00:46 +0530, Jaswinder Singh Rajput wrote:
> 
> > The following changes since commit 1d10914bf2c8a1164aef6c341e6c3518a91b8374:
> >   Ingo Molnar (1):
> >         Merge branch 'core/percpu'
> > 
> > are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip-cpu.git master
> > 
> > Jaswinder Singh Rajput (1):
> >       x86: msr architecture debug code

Hi,

Why do we need this in-kernel?
We have already access to MSRs via /dev/cpu/*/msr

Did you have a look at x86info.  (see
http://www.codemonkey.org.uk/projects/x86info/)
Recent versions contain a tool called lsmsr -- which shows you MSRs
and also decodes some bits, e.g.

# lsmsr IntPendingMessage -V 3 -c 1
IntPendingMessage    = 0x00000000082100b0
  IOMsgAddr=0xb0
  IOMsgData=0x21
  IntrPndMsgDis=0
  IntrPndMsg=0
  IORd=0
  SmiOnCmpHalt=0x1
  C1eOnCmpHalt=0

The tool just lacks some detailed MSR definitions for non-AMD CPUs.
Feel free to add them ... (and to fix bugs if encountered ;-)

Of course I've applied your patch to do a sniff test and found the
following:

- I've just one directory in debugfs
  x86/cpu/msr/cpu0
  The system has a quad-core CPU. So I guess there should be 4
  directories -- one for each core.

- The file showing MTRRs is misspelled (mttr instead of mtrr).


Regards,
Andreas


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