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

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Date:	Fri, 16 May 2008 10:19:34 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.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

On Thu, 2008-05-15 at 22:00 -0400, Vivek Goyal wrote:
[...]
> IMHO, this kind of make more sense to me when keeping C function like
> semantics in mind.
> 
> Both the cases can be treated like calls to functions (calling BIOS function
> and jumping to kernel B). The basic difference between two cases is the
> re-entry point. In BIOS function case, we always re-enter the function at the
> start but in case of kernel B, except first entry, all other entries happen
> at a run time determined address, which needs to be communicated to kernel A.
> 
> I would think that second kernel B just should execute "ret" and new entry
> address of kernel B is passed to kernel A through %eax (return value of
> function).

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.

Best Regards,
Huang Ying

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