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Rather than performing all config accesses via ioports, map in a 24-bit memory-mapped configuration space directly below the PCI MMIO region. This will allow architectures to support PCI without having to support legacy ioports in the guest kernel. Instead, kvm tool can forward the config accesses directly to the relevant ioport config callbacks. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>