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

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Message-ID: <m1tzgzez4f.fsf@frodo.ebiederm.org>
Date:	Thu, 15 May 2008 19:55:44 -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:

> The disadvantage of this solution is that kernel B must know it is
> original kernel (A) or kexeced kernel (B). Different code should be used
> by kernel A and kernel B. And after jump from A to B, jump from B to A,
> when jump from A to B again, kernel A must use different code from the
> first time.

I don't know what the case is for keeping two kernels in memory and switching
between them.

I suspect a small piece of trampoline code between the two kernels could
handle the case. (i.e. purgatory pays attention).

That is a fundamental aspect of the design.  A general purpose infrastructure
with trampoline code to adapt it to whatever situation comes up.

Eric
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