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Can you elaborate why it works > with dpdk but not qemu? dpdk needs like, say, 64M of aperture and doesn't care what the IOVAs are qemu needs the entire guest memory of aperture and must have IOVAs that are 1:1 with the GPA. So aperture size and location can exclude qemu > Can qemu verify this restriction via existing path or need new uAPI > flag to communicate? It already happens, the aperture/etc is convayed to qemu through IOMMUFD_CMD_IOAS_IOVA_RANGES and if qemu cannot get the IOVA's it needs to create the guest it should fail. Jason