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

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Message-ID: <CAE9FiQV5zpTiskB_RwXT8XGNfgTGSwc3AAFqCBusq1t4-OSJHw@mail.gmail.com>
Date:	Tue, 18 Dec 2012 12:55:17 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Jan Kiszka <jan.kiszka@....de>
Cc:	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 18, 2012 at 12:49 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 12/18/2012 12:43 PM, Yinghai Lu wrote:

>
> That is putting the cart before the horse.  What is the specific requirement
> with kgdb here (I didn't see any email on that, please don't have private
> back conversations)?  Either way, however, kgdb is a tool to debug the
> kernel... having it a barrier for proper functionality of the kernel is not
> acceptable.

did not hear back from Jason or Jan.

Looks like last mail in LKML from Jason is about Oct 20

looks like kgdb is want DB, BP, and PF are set at first.

and just after that early_param for kgdbwait will get into to hold the kernel.

then command from kgdb could dump ram etc.
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