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

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Message-ID: <20151204180426.GM21177@pd.tnic>
Date:	Fri, 4 Dec 2015 19:04:26 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
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>
Subject: Re: [PATCH] x86/rapl: Do not load in a guest

On Fri, Dec 04, 2015 at 09:46:42AM -0800, Jacob Pan wrote:
> Since RAPL is not architectural, consistency of hw support needs lots
> of improvement at the least.

It should have received a CPUID bit, no matter if it is architectural or
not.

> This error message is valid in other than VM. Domain detection error
> already propagated.

Huh, didn't I say that?

> 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.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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