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This change enables save and restore for TPU/VFIO such that they can be saved on one device and restored on another. The change tracks open VFIO/TPU FDs and, during save, captures the PCI Bus:Device:Function (BDF) and IOMMU group numbers so they can be properly remapped. During restore, it remaps these old IDs to new IDs based on the restored container's device configuration and reopens the necessary host file descriptors. The remapping information is passed via the context to the afterLoad methods of the VFIO/TPU FD implementations. PiperOrigin-RevId: 944046973