linux-kernel - Re: [PATCH v2 0/4] Enable SMEP CPU Feature

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Message-ID: <4DD23CF0.3090108@redhat.com>
Date:	Tue, 17 May 2011 12:16:32 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Fenghua Yu <fenghua.yu@...el.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Enable SMEP CPU Feature

On 05/17/2011 10:03 AM, Ingo Molnar wrote:
> * Fenghua Yu<fenghua.yu@...el.com>  wrote:
>
> >  From: Fenghua Yu<fenghua.yu@...el.com>
> >
> >  Intel new CPU supports SMEP (Supervisor Mode Execution Protection). SMEP
> >  prevents kernel from executing code in application. Updated Intel SDM describes
> >  this CPU feature. The document will be published soon.
> >
> >  Note: This patch set doesn't enable the SMEP feature in KVM. If it's needed,
> >  another patch will be pushed for enabling the feature in KVM.
>
> We can do it separately from native kernel support, but i'm sure Avi would
> agree that SMEP support in KVM would be nice!

Definitely.

> (as long as it's configurable as
> well, there might be guest OSs that break if SMEP is enabled, right?)

As mentioned earlier, the simple thing is to expose smep and let the 
guest enable it itself.

-- 
error compiling committee.c: too many arguments to function

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