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

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Date:	Fri, 04 Dec 2015 14:57:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
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 December 4, 2015 2:48:37 PM PST, Borislav Petkov <bp@...en8.de> wrote:
>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!

Yes, we can't keep them from being stupid, and they clearly are being so in the first place, but we can at least make it a bit easier to not be.  Since it is so easy to do that dumb thing let's not make it harder.
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