linux-kernel - [REGRESSION] S3 resume on SandyBridge doesn't work with NX protection (5bd5a45)

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Date:	Wed, 19 Jan 2011 18:37:11 +0100
From:	Matthias Hopf <mhopf@...e.de>
To:	Matthieu CASTET <castet.matthieu@...e.fr>,
	Lin Ming <ming.m.lin@...el.com>,
	Oliver Neukum <oneukum@...e.de>, rjw@...k.pl
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Michal Marek <mmarek@...e.cz>, Yinghai Lu <yinghai@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Borislav Petkov <bp@...en8.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	Xuxian Jiang <jiang@...ncsu.edu>,
	Dave Airlie <airlied@...hat.com>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [REGRESSION] S3 resume on SandyBridge doesn't work with NX
 protection (5bd5a45)

Git commit 5bd5a45 in Linus' tree "x86: Add NX protection for kernel data"
apparently breaks resume on SandyBridge machines. This is supposed to be
fixed with commit 691513f "x86: Resume trampoline must be executable",
but even git master (v2.6.38-rc1) shows the same symptoms.

After suspend to S3, the machine doesn't resume upon wakeup, but boots
normally instead. Reverting git commits 691513f, 84e1c6b, and especially
5bd5a45 (trivial except for a single hunk) makes resume work again.

lspci -vvv output is attached.


(for internal reference: machine NUE874)

Matthias

-- 
Matthias Hopf <mhopf@...e.de>      __        __   __
Maxfeldstr. 5 / 90409 Nuernberg   (_   | |  (_   |__          mat@...opf.de
Phone +49-911-74053-715           __)  |_|  __)  |__  R & D   www.mshopf.de

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