Date: Tue, 17 May 2011 09:05:27 +0200
From: Ingo Molnar <mingo@elte.hu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>, Thomas Gleixner <tglx@linutronix.de>,
        Asit K Mallick <asit.k.mallick@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Avi Kivity <avi@redhat.com>, Arjan van de Ven <arjan@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andi Kleen <andi@firstfloor.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH v2 0/4] Enable SMEP CPU Feature
Message-ID: <20110517070527.GD22305@elte.hu>
References: <1305581685-5144-1-git-send-email-fenghua.yu@intel.com>
 <4DD19C81.8000902@zytor.com>
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* H. Peter Anvin <hpa@zytor.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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