linux-kernel - Re: [PATCH 06/34] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation v2

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Message-ID: <20121023133527.GA16230@one.firstfloor.org>
Date:	Tue, 23 Oct 2012 15:35:27 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, acme@...hat.com, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>, avi@...hat.com,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 06/34] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation v2

> So I forgot how all this worked, but will the KVM emulation not pass
> this straight down to the hardware?

Pass down to perf. 

> 
> Don't we have a problem where we're emulating arch perfmon v1 on AMD
> hardware? On AMD hardware those bits do have meaning.

Ah they do? I wasn't aware. I can add a cpuid check for Intel I suppose.

-andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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