linux-kernel - RE: [PATCH] x86/apic: Disable I/O APIC before shutdown local APIC

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Date:	Wed, 6 Nov 2013 22:32:12 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] x86/apic: Disable I/O APIC before shutdown local APIC

> Ingo Molnar [mailto:mingo.kernel.org@...il.com] wrote:
> Friday, October 25, 2013 3:58 AM
> 
> * Fenghua Yu <fenghua.yu@...el.com> wrote:
> 
> > From: Fenghua Yu <fenghua.yu@...el.com>
> >
> > In reboot and crash path, when shutdown local APIC, I/O APIC is still
> active.
> > This may cause issues because external interrupts can still come in
> and
> > disturb local APIC during shutdown process. To quiet external
> interrupts,
> > disable I/O APIC before shutdown local APIC.
> 
> What specific 'issues' were observed, on what kind of systems?
> 

This patch is a workaround for a to-be-published erratum; the erratum
will be published in a few weeks.

Thanks.

-Fenghua
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