linux-kernel - Re: [PATCH -mm] kexec jump -v9

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Date:	Thu, 15 May 2008 11:42:03 -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, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -mm] kexec jump -v9

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

> Hi, Vivek,
>
> On Wed, 2008-05-14 at 16:52 -0400, Vivek Goyal wrote:
> [...]
>> Ok, I have done some testing on this patch. Currently I have just
>> tested switching back and forth between two kernels and it is working for
>> me.
>> 
>> Just that I had to put LAPIC and IOAPIC in legacy mode for it to work. Few
>> comments/questions are inline.
>
> It seems that for LAPIC and IOAPIC, there is
> lapic_suspend()/lapic_resume() and ioapic_suspend()/ioapic_resume(),
> which will be called before/after kexec jump through
> device_power_down()/device_power_up(). So, the mechanism for
> LAPIC/IOAPIC is there, we may need to check the corresponding
> implementation.

And if you start with the device shutdown path the code is already
there and working.

Eric
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