linux-kernel - Re: [RFC][PATCH 0/2 -mm] kexec based hibernation

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Message-ID: <20070827131549.GA4104@ucw.cz>
Date:	Mon, 27 Aug 2007 13:15:49 +0000
From:	Pavel Machek <pavel@....cz>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Huang, Ying" <ying.huang@...el.com>, vgoyal@...ibm.com,
	nigel@...el.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/2 -mm] kexec based hibernation

Hi!

> >> > Does this make sense?
> >> 
> >> Yes, this is a sensible optimization. But I think it may be better to
> >> make bootloader load kernel D directly into a specified memory location.
> >> For example, we can add a option to "kernel" command of grub. 
> >> 
> >> And, I think we can do more in bootloader. Such as we can prepare
> >> two
> >
> > Yes, that would be nice.
> >
> > It will mean quite a bit of work, but I guess it should be the long
> > term goal. Loading restore kernel directly from bootloader means:
> >
> > 1) it is fast -- no need to boot another kernel
> >
> > 2) it is "classical" way of doing things
> >
> > On the other hand, we loose flexibility that way:
> >
> > 1) it locks you onto one bootloader
> >
> > 2) you no longer have userland there to do uncompression, decryption,
> > etc..
> 
> True although for the uncompression and decryption those aren't exactly foreign
> requirements for bootloaders.

Well, uncompression yes, but crypto? What is that, some kind of
trusted computing thingie?

We do RSA for uswsusp, that may be a bit of problem for a bootloader,
but I'm glad bootloaders are bloated already :-).

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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