linux-kernel - Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

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Message-ID: <CAE9FiQWDgKdfA0=6qESAzT1JSLKMht5AYtQnffGyDmECynaMpQ@mail.gmail.com>
Date:	Tue, 25 Dec 2012 12:51:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Jan Kiszka <jan.kiszka@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

On Tue, Dec 25, 2012 at 3:20 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Mon, Dec 24, 2012 at 08:04:18PM -0800, Yinghai Lu wrote:
>> well, I updated for-x86-boot-v7 that stop #PF handler after
>> init_mem_mapping.
>>
>> it has fix for AMD system aka reverting far jmp to ret.
>
> -v7?
>
> You told me yesterday -v8 is the current branch. Do you have -v7 which
> does break KGDB and -v8 which breaks it and both branches are current?
>

-v7: stop #PF handler after init_mem_mapping, so it could break KGDB,
if someone try to use mdump.
-v8: stop #PF handler before x86_64_start_reservations.

Now both have be updated and could work with AMD platform after drop
the change with lretq aka keep lretq.

Yinghai
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