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

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Message-ID: <m1skwjghen.fsf@frodo.ebiederm.org>
Date:	Thu, 15 May 2008 18:35:28 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Huang, Ying" <ying.huang@...el.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

Vivek Goyal <vgoyal@...hat.com> writes:

> ioapic_suspend() is not putting APICs in Legacy mode and that's why
> we are seeing the issue. It only saves the IOAPIC routing table entries
> and these entries are restored during ioapic_resume().
>
> But I think somebody has to put APICs in legacy mode for normal 
> hibernation also. Not sure who does it. May be BIOS, so that during
> resume, second kernel can get the timer interrupts.

I doubt anything cares in the suspend to ram case. There should just
be a small BIOS trampoline to get back to linux when the processor
restarts.  And you don't need interrupts for any of that. 

Eric
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