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

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Date:	Thu, 18 Jun 2009 12:48:11 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's
 no local APIC

On 06/18/09 12:27, Eric W. Biederman wrote:
>> The only actual exception I know of is Xen's replacement of the physical
>> local APIC with a paravirtualized interrupt interface.
>>     
>
> No one ever has.  Xen doesn't have I/O APICs either.  Not in any real
> sense.  Xen just has devices that looking like I/O apics if you don't
> look close.
>   

Well, if acpi_pci_irq_lookup() and friends return the right things
without having parsed the MADT and set up the secondary state, then we
should be fine either way.

acpi_irq_model gets tested in all sorts of random places, so I wonder if
we'll need to set it to ACPI_IRQ_MODEL_IOAPIC (or something else?) to
make things work properly.

Hm, and principle we just get the SCI gsi from the FADT, but there's all
that other mucking about with it in the MADT processing... Wonder what
needs to happen there...

    J
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