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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sun, 30 Jun 2013 16:32:09 +1000
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Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFCv3 kvm irqfd: support
 msimessage to irq translation in PHB
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To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Anthony Liguori <aliguori@us.ibm.com>, "Michael S . Tsirkin" <mst@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel <qemu-devel@nongnu.org>, Alex Williamson <alex.williamson@redhat.com>, qemu-ppc@nongnu.org, Anthony Liguori <anthony@codemonkey.ws>, Paolo Bonzini <pbonzini@redhat.com>, Paul Mackerras <paulus@samba.org>, David Gibson <david@gibson.dropbear.id.au>

On Sun, 2013-06-30 at 10:59 +1000, Alexey Kardashevskiy wrote:
> > 1) A PCI bus function to do the MSI -> virq mapping
> > 2) On x86 (and e500), this is implemented by calling kvm_irqchip_add_msi_route()
> > 3) On pseries, this just returns msi->data
> > 
> > Perhaps (2) can just be the default PCI bus implementation to simplify things.
> 
> 
> hw/pci/pci.c does not have any kvm code yet and I would like not to be the
> first person who tries adding this there :)
> But ok, I'll do it.

Unless I'm confused (which is very possible) I seem to remember that there was
duplication of that MSI / KVM mapping between virtio-pci and vfio as well,
so it makes sense to move it to the PCI code.

Cheers,
Ben.