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

From: Beth Kon
Subject: Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
Date: Thu, 27 Aug 2009 22:20:33 -0400
User-agent: Thunderbird (X11/20090608)

Avi Kivity wrote:
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.

I was thinking of the HPET advertising one or more of these new ioapic interrupts so that it could support non-legacy operation. It can't at the moment because there are no interrupt lines available. I haven't looked into the details of what would remain to be done to make this happen, but does it sound reasonable? Sounds like at a minimum acpi needs some work.

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