linux-kernel - Re: [RFC][PATCH -mmotm 1/4] Add static function calls of pstore to kexec path

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Date:	Tue, 19 Jul 2011 15:20:25 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Seiji Aguchi <seiji.aguchi@....com>,
	Matthew Garrett <mjg@...hat.com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Americo Wang <xiyou.wangcong@...il.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jarod Wilson <jwilson@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [RFC][PATCH -mmotm 1/4] Add static function calls of pstore to
 kexec path

On Tue, Jul 19, 2011 at 03:02:12PM -0400, Vivek Goyal wrote:
> > Another interesting question is do we need to log anything in the kdump
> > path?  Isn't kdump generating the same info?  What added value do we get
> > over kdump?
> 
> I had the same question. The argument is that kdump can fail and they
> can not afford to not capture any info at all. So before kdump executes
> they want to save some state to NVRAM.
> 
> I am wondering that saving this info to NVRAM, can it be done early in
> second kernel? I guess we are not supposed to take any EFI services in
> second kernel so it might not be possible.

Actually the write to NVRAM wouldn't be so bad if ERST supported it.  It
would just be an equvialent to a memcpy.  Currently it uses a complicated
state machine to a persistent storage which complicates things.  As a
result I get nervous if ERST firmware issues would block us from executing
kdump.

Cheers,
Don
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