With the setup described in BZ https://bugzilla.redhat.com/show_bug.cgi?id=2103649

where the 2 assigned PFs end up in the same iommu group on the guest (by mistake in that case due to the bug, but this can actually happen if the 2 assigned devices are pluged downstream to a PCIe to PCI bridge), we get spurious qemu errors:

2022-12-07T13:47:03.661326Z qemu-system-x86_64: VFIO_MAP_DMA failed: File exists
2022-12-07T13:47:03.661333Z qemu-system-x86_64: vfio_dma_map(0x556cc5e0acf0, 0xbfbd1000, 0x1000, 0x7f1692853000) = -17 (File exists)

This is due to a bug in the QEMU virtio-iommu device where the replay and remap function only do MAP without prior UNMAP, causing this attempt dma map onto an existing mapping.