linux-kernel - Re: [PATCH 2/2] kexec jump -v10: save/restore device state

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Date:	Wed, 28 May 2008 08:57:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"Huang, Ying" <ying.huang@...el.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, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH 2/2] kexec jump -v10: save/restore device state

On Thu, May 22, 2008 at 05:38:19PM +0800, Huang, Ying wrote:

[..]
> Known issues:
> 
> - Can not work with the new devices hibernation operations in
>   2.6.26-rc2-mm1 so far. Working on this now.
> 
> - APIC is not put into legacy mode during kexec, so kexec may failed
>   (no IRQ) if APIC is not put into legacy mode.
> 
> - The suspend/resume callback of device drivers are used to put
>   devices into quiescent state. This will unnecessarily (possibly
>   harmfully) put devices into low power state. This is intended to be
>   solved by separating device quiesce/unquiesce callback from the
>   device suspend/resume callback.
> 
> - Because the segment number supported by sys_kexec_load is limited,
>   hibernation image with many segments may not be load. This is
>   planned to be eliminated by adding a new flag to sys_kexec_load to
>   make a image can be loaded with multiple sys_kexec_load invoking.
> 
> 

These two patches look good to me. I think once you have worked out
issues with IOAPIC and generated patches for compatibility with
new suspend/resume callbacks, these patches are good enough to get
some testing going on in -mm tree.

I will also test out -v10 very soon.

Thanks
Vivek
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