linux-kernel - Re: [PATCH V2 2/3] perf protect LBR when Intel PT is enabled.

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Date:	Thu, 3 Jul 2014 19:07:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kan.liang@...el.com, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH V2 2/3] perf protect LBR when Intel PT is enabled.

On Thu, Jul 03, 2014 at 05:52:37PM +0200, Andi Kleen wrote:
> > If there's active LBR users out there, we should refuse to enable PT and
> > vice versa. 
> 
> This doesn't work, e.g. hardware debuggers can take over at any time.

Tough cookies. Hardware debuggers get to deal with whatever crap they
cause.

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