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To support PCIe P2P between VFIO devices, we populate IOMMU mappings for
the non-emulated MMIO regions of all VFIO devices via
`VFIO_IOMMU_MAP_DMA` (f0c1f8d), but the patch did not properly update
the IOMMU mappings with BAR reprogramming.
Fixes: #7027
Signed-off-by: Bo Chen <bchen@crusoe.ai>