spapr-pci: enable irqfd for INTx
This enables IRQFD for LSI (level triggered INTx interrupts) by adding a spapr_route_intx_pin_to_irq() callback to the sPAPR PCI host bus. This callback is called to know the global interrupt number to link resampling fd with IRQFD's fd in KVM. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: NAlexander Graf <agraf@suse.de>
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