linux-kernel - Re: [tip:perf/core] x86, tracing, perf: Add trace point for MSR accesses

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Message-ID: <20151204224837.GU21177@pd.tnic>
Date:	Fri, 4 Dec 2015 23:48:37 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>,
	linux-tip-commits@...r.kernel.org, vincent.weaver@...ne.edu,
	eranian@...gle.com, efault@....de, peterz@...radead.org,
	jolsa@...hat.com, torvalds@...ux-foundation.org,
	tglx@...utronix.de, rostedt@...dmis.org, acme@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [tip:perf/core] x86, tracing, perf: Add trace point for MSR
 accesses

On Fri, Dec 04, 2015 at 02:35:38PM -0800, H. Peter Anvin wrote:
> How about this: it is easy too easy to hard code MSR accesses, and the
> last things we need is alien non-GPL drivers doing their own low-level
> hacks bypassing these facilities.

Yeah, that doesn't stop alien, non-GPL drivers from doing

	asm("rdmsr ..)

Hell, they can even do naked byte opcodes " ...0f 32... "

But I see your point, thanks!

-- 
Regards/Gruss,
    Boris.

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