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

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Message-ID: <20110517070527.GD22305@elte.hu>
Date:	Tue, 17 May 2011 09:05:27 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Fenghua Yu <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	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>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v2 0/4] Enable SMEP CPU Feature


* H. Peter Anvin <hpa@...or.com> wrote:

> On 05/16/2011 02:34 PM, Fenghua Yu wrote:
> > 
> > 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.
> > 
> 
> Hi Avi,
> 
> Could you comment on if this needs to be a gating factor?

I think KVM would benefit from the native kernel playing guinea pig whether 
SMEP is really, truly 100% trouble-free to enable by default (for Linux) ;-)

Some programmable configurability seems necessary on the KVM side, as KVM has 
no control over how sane the guest kernel is.

Thanks,

	Ingo
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