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This patch provide MMCONFIG address for PCI host bridges, which will be used to support host bridge hotplug. It gets MMCONFIG address by evaluating _CBA method if available. Reviewed-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>