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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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