linux-kernel - Re: [PATCH] kexec based hibernation: a prototype of kexec multi-stage load

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Message-ID: <m1lk2c4l4i.fsf@frodo.ebiederm.org>
Date:	Wed, 14 May 2008 14:43:41 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Pavel Machek <pavel@....cz>,
	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH] kexec based hibernation: a prototype of kexec multi-stage load

"Huang, Ying" <ying.huang@...el.com> writes:

>> So, IMHO, for first simple implementation, we don't have to pass around
>> any data between kernels except entry point. (Please correct me if I am 
>> wrong). Lets get that implementation in first and then we can get rest
>> of the pieces in place.
>
> Yes. Kernel entry/re-entry point is the only information need to be
> communicated between kernels for just switching between them. So we can
> focus on kexec jump patch firstly.

Then as a preliminary design let's plan on this.

- Pass the rentry point as the return address (using the C ABI).
  We may want to load the stack pointer etc so we can act as
  a direct entry point for new code.

- Look at passing a pointer to the mapping of pages that the kexec
  trampoline uses in arg1 of the C ABI.  Largely the format is defacto
  fixed anyway because we need to pass the structure from C to
  assembly.

Using the standard C ABI makes things much it much easier to pick
a calling convention, and to document it.

Eric
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