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

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Message-ID: <20131025105742.GA5485@gmail.com>
Date:	Fri, 25 Oct 2013 12:57:42 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Fenghua Yu <fenghua.yu@...el.com>
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


* 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?

Thanks,

	Ingo
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