Re: [kvmarm] [RFC PATCH 0/3] KVM: ARM: Get rid of hardcoded VGIC addresses

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Il 26/10/2012 12:37, Benjamin Herrenschmidt ha scritto:
>> > Wiring which MSI-X interrupts go to which source controllers.  If you
>> > have one source controller per PCI bridge, you need to tell the kernel
>> > the mapping between MSI messages interrupts and PCI bridges, and update
>> > it whenever the MSI masking changes.
> Not sure I get it. Are you talking in the context of PCI pass-through ?

Not just that, it's also for emulated devices that do MSI-X (virtio-pci
does).

> > The other problem is configuring the redirection table.  If you need >64
> > sources you need ioctls like KVM_GET/SET_IRQCHIP_ONE_REG.
> Well, all of that is totally specific to the IO-APIC design &
> limitations as far as I can tell. What is the "redirection table" ?

The wiring between source and presentation controllers, roughly.  I
suppose that's what Paul referred to when he said there's 64 bits of
config info per source in the source controllers.

Paolo
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