From: "H. Peter Anvin" <hpa@zytor.com>
To: "Yu, Fenghua" <fenghua.yu@intel.com>
Cc: Matthew Garrett <mjg@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
"Mallick, Asit K" <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>
Subject: Re: [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP
Date: Tue, 17 May 2011 16:12:53 -0700 [thread overview]
Message-ID: <4DD300F5.9070101@zytor.com> (raw)
In-Reply-To: <493994B35A117E4F832F97C4719C4C04011505C272@orsmsx505.amr.corp.intel.com>
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
next prev parent reply other threads:[~2011-05-17 23:14 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 21:34 [PATCH v2 0/4] Enable SMEP CPU Feature Fenghua Yu
2011-05-16 21:34 ` [PATCH v2 1/4] x86, cpu: Add CPU flags for SMEP Fenghua Yu
2011-05-17 1:56 ` H. Peter Anvin
2011-05-16 21:34 ` [PATCH v2 2/4] x86, cpu: Add SMEP CPU feature in CR4 Fenghua Yu
2011-05-16 21:34 ` [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP Fenghua Yu
2011-05-17 2:10 ` Matthew Garrett
2011-05-17 23:08 ` Yu, Fenghua
2011-05-17 23:12 ` H. Peter Anvin [this message]
2011-05-18 2:57 ` Yu, Fenghua
2011-05-16 21:34 ` [PATCH v2 4/4] x86/kernel/common.c: Disable SMEP by kernel option nosmep Fenghua Yu
2011-05-16 22:01 ` Thomas Gleixner
2011-05-16 21:52 ` [PATCH v2 0/4] Enable SMEP CPU Feature H. Peter Anvin
2011-05-17 7:05 ` Ingo Molnar
2011-05-17 9:15 ` Avi Kivity
2011-05-17 9:29 ` Ingo Molnar
2011-05-17 9:32 ` Avi Kivity
2011-05-17 10:46 ` Ingo Molnar
2011-05-17 11:34 ` Avi Kivity
2011-05-17 11:38 ` Ingo Molnar
2011-05-17 11:44 ` Avi Kivity
2011-05-17 11:47 ` Avi Kivity
2011-05-17 11:49 ` Pekka Enberg
2011-05-17 11:50 ` Ingo Molnar
2011-05-19 6:10 ` Tian, Kevin
2011-05-19 6:41 ` Shan, Haitao
2011-05-20 8:21 ` Ingo Molnar
2011-05-17 7:03 ` Ingo Molnar
2011-05-17 9:16 ` Avi Kivity
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