linux-kernel - Re: perf, x86: only do lbr init if bts is available

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Message-ID: <1337880069.9698.70.camel@twins>
Date:	Thu, 24 May 2012 19:21:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Gleb Natapov <gleb@...hat.com>, Avi Kivity <avi@...hat.com>
Subject: Re: perf, x86: only do lbr init if bts is available

On Thu, 2012-05-24 at 19:18 +0200, Peter Zijlstra wrote:

> Right, as Stephane already noted, LBR is not an CPUID enumerated
> feature, hence the only thing you can do is go by model. So if you set
> qemu -cpu host but fail to implement all the architectural MSRs that go
> with that model you get to keep the pieces.

s/architectural//

They're called Model-Specific-Registers for a reason ;-)
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