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

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
Date: Thu, 27 Aug 2009 07:53:53 +0300
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On 08/26/2009 07:30 PM, Gerd Hoffmann wrote:
On 08/26/09 18:06, Avi Kivity wrote:
On 08/26/2009 07:03 PM, Gerd Hoffmann wrote:
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).

Right now we have IRQs 5,10,11 for PCI. Having one more IRQ (so we have one for each link) would be useful IMHO. eight links + eight irqs would be even more useful. What needs to be done for that?

BTW: Seems linux doesn't use IRQ 5 even with lots of PCI devices, instead it makes them share 10+11 ...

We could change the defaults to include 5, but maybe it makes more sense to fix Linux to distribute active PCI IRQs across the resources it has at its disposal.

Now I don't think it's worthwhile, as every guest that
is interesting from a performance point of view has MSI support.

Not all emulated devices have MSI support though ...

They'll be slow regardless. I should be easy to support msi on e1000 though.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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