linux-kernel - Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6

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Message-ID: <20140205195305.GM2936@laptop.programming.kicks-ass.net>
Date:	Wed, 5 Feb 2014 20:53:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vince@...ter.net>
Cc:	junk@...af.co.uk, alan@...rguk.ukuu.org.uk,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf,x86,p6: Add userspace RDPMC quirk for P6

On Wed, Feb 05, 2014 at 02:29:36PM -0500, Vince Weaver wrote:
> from the document you linked it looks like it was fixed by the Pentium 
> Pro stepping sB1 (6.1.9).

OK, I'll add a boot_cpu_data.x86_mask >= 0xB1 test.

> Has someone actually hit this bug?  People used PAPI/perfctr on these 
> machines for years, and it uses rdpmc by default so I would think it would 
> show up if it were an issue.  I should check the perfctr code to see if it 
> had some sort of check.

Yeah, the reporter had a boot fail due to this.
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