Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there'sno local APIC

From: Jeremy Fitzhardinge
Date: Thu Jun 18 2009 - 15:14:58 EST

On 06/18/09 09:08, Len Brown wrote:
>> In principle, the local APIC and the I/O APIC are distinct (but related)
>> components, which can be independently present.
> bzzzzt, but thanks for playing:-)

Perhaps I should have expressed that a bit more clearly: you could, if
mad, build a machine with I/O APICs and some other mechanism for
delivering the interrupts to CPUs. In practice, I doubt anyone ever
has, or ever would.

The only actual exception I know of is Xen's replacement of the physical
local APIC with a paravirtualized interrupt interface.

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