[Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

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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