linux-kernel - Re: [git-pull -tip] x86: Addition of cpufeatures to friendly access miscellaneous MSRs

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Message-ID: <4A087BF8.9010709@zytor.com>
Date:	Mon, 11 May 2009 12:26:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Robert Richter <robert.richter@....com>
CC:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...nel.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip] x86: Addition of cpufeatures to friendly	access
 miscellaneous MSRs

Robert Richter wrote:
> 
> Anyway, I think this was already decided. So, maybe for debugging we
> should simply read the msrs with rdmsr_safe() and use the exception
> handler to check if the msr is implemented. This would avoid most of
> the otherwise unused cpufeature flags above.
> 

For that use, it's probably the right thing to do.

(FWIW, I agree that dumping MSRs in userspace is the right thing to do. 
  This is being heavily discussed on the util-linux-ng list, as far as I 
can tell.)

	-hpa

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