When a user-managed page table is attached to an IOMMU, it is necessary to deliver IO page faults to user space so that they can be handled appropriately. One use case for this is nested translation, which is currently being discussed in the mailing list. I have posted a RFC series [1] that describes the implementation of delivering page faults to user space through IOMMUFD. This series has received several comments on the IOMMU refactoring, which I have addressed in this series. The major refactoring includes: - Removing include/uapi/linux/iommu.h. - Removing iommu_[un]register_device_fault_handler(). - Making fault_param always available between iommu device probe and release. - Using fault cookie to store temporary data used for processing faults. This is also available at github [2]. I would appreciate your feedback on this series. [1] https://lore.kernel.org/linux-iommu/20230530053724.232765-1-baolu.lu@xxxxxxxxxxxxxxx/ [2] https://github.com/LuBaolu/intel-iommu/commits/preparatory-io-pgfault-delivery-v1 Best regards, baolu Lu Baolu (9): iommu: Move iommu fault data to linux/iommu.h iommu: Add device parameter to iopf handler iommu: Add common code to handle IO page faults iommu: Change the return value of dev_iommu_get() iommu: Make fault_param generic iommu: Remove iommu_[un]register_device_fault_handler() iommu: Add helper to set iopf handler for domain iommu: Add iommu page fault cookie helpers iommu: Use fault cookie to store iopf_param include/linux/iommu.h | 206 +++++++++++++++--- drivers/iommu/iommu-sva.h | 8 +- include/uapi/linux/iommu.h | 161 -------------- .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 13 +- drivers/iommu/intel/iommu.c | 18 +- drivers/iommu/io-pgfault.c | 55 +++-- drivers/iommu/iommu-sva.c | 2 +- drivers/iommu/iommu.c | 199 ++++++++--------- MAINTAINERS | 1 - 9 files changed, 320 insertions(+), 343 deletions(-) delete mode 100644 include/uapi/linux/iommu.h -- 2.34.1
