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

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Message-ID: <1210830110.23707.141.camel@caritas-dev.intel.com>
Date:	Thu, 15 May 2008 13:41:50 +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, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -mm] kexec jump -v9

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.

Best Regards,
Huang Ying
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