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Same for other vendors. > the caller (e.g. vfio) just tries to map as many contiguous pages as > possible but in the end it's iommu driver to decide the actual size. An iommu_domain with a non-uniform page_size is weird, but it could be made to work as some device-specific thing. The only thing the core codes care about is the minimum alignment, so you'd just have to set it to 4k and mapping the wrong thing to the 2M area would fail. domains with their io page size != PAGE_SIZE are already very special things that require special handling by userspace.. Jason