Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus

[Avi Kivity]

On 08/26/2009 07:03 PM, Gerd Hoffmann wrote:
> On 08/09/09 18:44, Avi Kivity wrote:
> > Instead of calling the IOAPIC from the PIC, raise IOAPIC irqs via the 
> > ISA bus.
> > As a side effect, IOAPIC lines 16-23 are enabled.
>
> Now we probably need some acpi magic to tell the guest OS that there 
> are a few more IRQ lines?

I wanted to route the PCI IRQs to those lines (and have eight links 
instead of four).  Now I don't think it's worthwhile, as every guest 
that is interesting from a performance point of view has MSI support.

So I think we should just leave these lines as is, terminated with a 
4.7K resistor to avoid picking up noise.

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