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

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Message-ID: <4DD300F5.9070101@zytor.com>
Date:	Tue, 17 May 2011 16:12:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.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

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
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