linux-kernel - Re: [PATCH 1/2] x86-32: Fix crashes with CPU hotplug on AMD machines

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Message-ID: <4C6417AB.1050105@zytor.com>
Date:	Thu, 12 Aug 2010 08:47:55 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...64.org>
CC:	Joerg Roedel <joro@...tes.org>,
	"Roedel, Joerg" <Joerg.Roedel@....com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"Seidel, Conny" <Conny.Seidel@....com>,
	"Sarathy, Bhavna" <Bhavna.Sarathy@....com>,
	"greg@...ah.com" <greg@...ah.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86-32: Fix crashes with CPU hotplug on AMD machines

On 08/12/2010 08:47 AM, Borislav Petkov wrote:
>>
>> Agreed.  I do have a concern about the kernel page tables not being
>> synchronized into trampoline_pg_dir (it's only an issue for 32-bit
>> !PAE), so at the very least we need to keep an eye out for it...
> 
> I've been working on what you suggested and the patch boots on a 32-bit
> PAE kernel but keeps rebooting on non-PAE after setting the stack_start
> on the AP. I could send it out later for you to look at, if you like -
> you should be able to spot what I'm missing :)...
> 

Sounds good.  This is obviously .37-or-higher material.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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