linux-kernel - Re: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX protection for kernel data)

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Date:	Tue, 23 Nov 2010 23:55:27 +0100
From:	mat <castet.matthieu@...e.fr>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	Xuxian Jiang <jiang@...ncsu.edu>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>, tglx <tglx@...utronix.de>
Subject: Re: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX protection
 for kernel data)

Le Mon, 22 Nov 2010 17:42:47 +0100,
Andi Kleen <andi@...stfloor.org> a écrit :

> > That seems to be a S3 specific code path, that won't fix anything.
> > Simply do:
> > 
> > echo 0 > /sys/devices/system/cpu/cpu1/online;
> > echo 1 > /sys/devices/system/cpu/cpu1/online;
> > 
> > and your machine will explode..
> 
> The SMP startup trampoline is copied I believe
> and only executed in real mode without page tables.
> 
> So it's perhaps not the trampoline, but the early startup 
> code that ends up being broken.
yes :
acpi wakeup code and smp trampoline are copied in low memory (first
1MB).

So they can't end up int the kernel data mapping ?

So it should something else.

I will try to investigate on this.

Matthieu
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