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

From: Ingo Molnar
Date: Fri Oct 25 2013 - 06:57:51 EST

* Fenghua Yu <fenghua.yu@xxxxxxxxx> wrote:

> From: Fenghua Yu <fenghua.yu@xxxxxxxxx>
> 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?


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