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To remember the previously mapped/registered vbar base For the following reasons: register_mmio_emulation_handler() will throw an error if the the same addr_lo is alreayd registered before We are going to remove the base member from struct pci_bar, so we cannot use vdev->bar[idx].base in the code any more In subsequent commits, we will assume vdev_pt_remap_generic_mem_vbar() is called after a new vbar base is set, mainly because of 64-bit mmio bar handling, so we need a separate bar_base_mapped[] array to track the previously mapped vbar bases. Tracked-On: #3241 Signed-off-by: dongshen <dongsheng.x.zhang@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com>