linux-kernel - RE: [PATCH v2 3/4] x86, head

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Message-ID: <493994B35A117E4F832F97C4719C4C04011505C394@orsmsx505.amr.corp.intel.com>
Date:	Tue, 17 May 2011 19:57:17 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Matthew Garrett <mjg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <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>
Subject: RE: [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP

> -----Original Message-----
> From: H. Peter Anvin [mailto:hpa@...or.com]
> Sent: Tuesday, May 17, 2011 4:13 PM
> To: Yu, Fenghua
> Cc: Matthew Garrett; Ingo Molnar; Thomas Gleixner; Mallick, Asit K;
> Linus Torvalds; Avi Kivity; Arjan van de Ven; Andrew Morton; Andi
> Kleen; linux-kernel
> Subject: Re: [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP
> 
> On 05/17/2011 04:08 PM, Yu, Fenghua wrote:
> >>
> >> Are EFI runtime service pages currently set up appropriately?
> >
> > They are not set up yet. efi init is called after this.
> >
> > But at this time there is no user space code yet. So there is no SMEP
> violation chance until later when any user space page table is setup.
> >
> 
> Are EFI runtime pages set up with U=0?  I would argue it is a bug if
> they aren't, but we want to make sure that there isn't such a bug.
> 
> 	-hpa

The runtime services are ioremapped. So they should be U=0.

Thanks.

-Fenghua
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