From: David Stevens <steve...@chromium.org> This patch set includes various fixes for dma-iommu's swiotlb bounce buffers for untrusted devices. There are four fixes for correctness issues, one for a performance issue, and one for general cleanup.
The min_align_mask issue was found when running fio on an untrusted nvme device with bs=512. The other issues were found via code inspection, so I don't have any specific use cases where things were not working, nor any concrete performance numbers. v3 -> v4: - Fold _swiotlb functions into _page functions - Add patch to align swiotlb buffer to iovad granule - Combine if checks in iommu_dma_sync_sg_* functions v2 -> v3: - Add new patch to address min_align_mask bug - Set SKIP_CPU_SYNC flag after syncing in map/unmap - Properly call arch_sync_dma_for_cpu in iommu_dma_sync_sg_for_cpu v1 -> v2: - Split fixes into dedicated patches - Less invasive changes to fix arch_sync when mapping - Leave dev_is_untrusted check for strict iommu David Stevens (6): dma-iommu: fix sync_sg with swiotlb dma-iommu: fix arch_sync_dma for map dma-iommu: skip extra sync during unmap w/swiotlb dma-iommu: Check CONFIG_SWIOTLB more broadly swiotlb: support aligned swiotlb buffers dma-iommu: account for min_align_mask drivers/iommu/dma-iommu.c | 193 +++++++++++++++++--------------------- include/linux/swiotlb.h | 3 +- kernel/dma/swiotlb.c | 11 ++- 3 files changed, 97 insertions(+), 110 deletions(-) -- 2.33.0.rc1.237.g0d66db33f3-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
