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[Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just becaus

To: Len Brown <lenb@xxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 18 Jun 2009 12:14:40 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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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.

    J

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