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

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Date:	Sat, 27 Nov 2010 07:39:56 +0800
From:	Lin Ming <lin@...g.vg>
To:	mat <castet.matthieu@...e.fr>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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)

On Sat, Nov 27, 2010 at 1:31 AM, mat <castet.matthieu@...e.fr> wrote:
> Le Tue, 23 Nov 2010 23:55:27 +0100,
> mat <castet.matthieu@...e.fr> a écrit :
>
>> 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.
>>
> Unfortunately on my laptop supporting NX, suspend to ram seems broken
> (even without this patch) and I got only one core, so I am unable to
> test it.
>
> Does cpu suspend/resume is broken ? Or it is only S3 ?
>
> If yes, are there any interesting trace if we suspend only one core with
> sysfs.

Hi,

I am on travel now, will test it when I'm back next week.

Thanks,
Lin Ming

>
> Thanks,
>
> Matthieu
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