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

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Message-ID: <4D3A05DC.4000208@free.fr>
Date:	Fri, 21 Jan 2011 23:17:00 +0100
From:	matthieu castet <castet.matthieu@...e.fr>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Lin Ming <ming.m.lin@...el.com>, Oliver Neukum <oneukum@...e.de>,
	rjw@...k.pl, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.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: Re: [REGRESSION] S3 resume on SandyBridge doesn't work with NX protection
 (5bd5a45)

H. Peter Anvin a écrit :
> On 01/20/2011 01:18 PM, matthieu castet wrote:
>> PS :
>> x86 trampoline is a mess. There are many (wakeup, smpboot) and differ between 32 and 64 bit.
>> H. Peter Anvin, aren't you rewriting them ?
> 
> Yes, working on it, starting with the framework used to install them.
> 
> They can't all be unified; they are used for different purposes and have
> different requirements (for one thing, 32 vs 64 bits require different
> trampoline code), but the install framework patchset is almost done, and
> the recent change of keeping the 1:1 pagetable set around is also a
> dramatic cleanup.
Of course, but for example on x64, using smp trampoline to exit rm wakecode help
to merge code in one place.

Also the start of 32/64 bits trampoline (rm part) is really similar. The main difference is the verify_cpu
check, but can't it be called latter (when we switch to 64 bits ) ?

In the end we could have something like

wakeup_code:
(common rm 16 bit code)
call trampoline

trampoline:
(common rm 16 bit code)
call startup_32_vector (either startup_32_smp for 32 bits (exit trampoline) or startup_32 for 64 bit).

startup_32:
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