linux-kernel - Re: [PATCH] x86/rapl: Do not load in a guest

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Date:	Fri, 4 Dec 2015 10:16:10 -0800
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Amy Wiles <amy.l.wiles@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hannes Reinecke <hare@...e.de>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH] x86/rapl: Do not load in a guest

On Fri, 4 Dec 2015 19:04:26 +0100
Borislav Petkov <bp@...en8.de> wrote:

> > This is good for the first level RAPL detection. The only way is to
> > base detection on known CPU models.  
> 
> ...and yet Hannes sees it on a minnowboard. CCed.
> 
> The CPU model-based detection is ugly and does not always work, as
> you see.
CPU model detection is the first level checking. The error is about no
valid domains (e.g. counters not working). So the error on minnowboard
board could be a real problem if you expect to use RAPL.

Jacob
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