On Thu, Feb 25, 2021 at 02:26:51PM +0800, Lu Baolu wrote: > When the first level page table is used for IOVA translation, it only > supports Read-Only and Read-Write permissions. The Write-Only permission > is not supported as the PRESENT bit (implying Read permission) should > always set. When using second level, we still give separate permissions > that allows WriteOnly which seems inconsistent and awkward. There is no > use case we can think off, hence remove that configuration to make it > consistent.
No use-case for WriteOnly mappings? How about DMA_FROM_DEVICE mappings? _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
