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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 am trying to address in this series. The major refactoring includes: - [PATCH 01 ~ 04] Move include/uapi/linux/iommu.h to include/linux/iommu.h. Remove the unrecoverable fault data definition. - [PATCH 05 ~ 06] Remove iommu_[un]register_device_fault_handler(). - [PATCH 07 ~ 10] Separate SVA and IOPF. Make IOPF a generic page fault handling framework. - [PATCH 11 ~ 16] Improve iopf framework. This is also available at github [2]. [1] https://lore.kernel.org/linux-iommu/20230530053724.232765-1-baolu.lu@linux.intel.com/ [2] https://github.com/LuBaolu/intel-iommu/commits/preparatory-io-pgfault-delivery-v11 Change log: v11: - Cleanup IOMMU_PAGE_RESP_PASID_VALID flag bit. - Cleanup code comments. v10: https://lore.kernel.org/linux-iommu/20240122054308.23901-1-baolu.lu@linux.intel.com/ - Make iopf_group_response() return void, as nobody can do anything with the failure. - Make iommu_report_device_fault() automatically respond to unhandleable faults and change its return type to void. - PATCH 01 ~ 14 are in good shapes now. v9: https://lore.kernel.org/linux-iommu/20231220012332.168188-1-baolu.lu@linux.intel.com/ - Protecting the assignment of dev->iommu->fault_param with RCU. - Extending the fault parameter's lifetime to the entire path of iopf handling. - Since iopf_queue_flush_dev() can only be called before iopf_queue_remove_device(), there's no need to hold a reference count. - Improve iopf_queue_remove_device() as per Jason's comments on the device removal sequence from the iopf queue. This will likely require changes to the iommu drivers, which are supposed to be addressed in separate series. - Track the iopf_group as a whole instead of the last fault within the group to simplify the fault report and response paths. - PATCH 01 ~ 11 are in good shapes now. v8: https://lore.kernel.org/linux-iommu/20231207064308.313316-1-baolu.lu@linux.intel.com/ - Drop PATCH 12/12 as it is no longer necessary to drain page requests page requests during PASID translation changes. - Separate PATCH 11/12 into two distinct patches. The first patch refines locking scheme for protecting per-device fault data, while the second patch replaces mutex with RCU to enhance locking efficiency. - PATCH 01 ~ 10 are in good shapes now. v7: https://lore.kernel.org/linux-iommu/20231115030226.16700-1-baolu.lu@linux.intel.com/ - Rebase to v6.7-rc1. - Export iopf_group_response() for global use. - Release lock when calling iopf handler. - The whole series has been verified to work for SVA case on Intel platforms by Zhao Yan. Add her Tested-by to affected patches. v6: https://lore.kernel.org/linux-iommu/20230928042734.16134-1-baolu.lu@linux.intel.com/ - [PATCH 09/12] Check IS_ERR() against the iommu domain. [Jingqi/Jason] - [PATCH 12/12] Rename the comments and name of iopf_queue_flush_dev(), no functionality changes. [Kevin] - All patches rebased on the latest iommu/core branch. v5: https://lore.kernel.org/linux-iommu/20230914085638.17307-1-baolu.lu@linux.intel.com/ - Consolidate per-device fault data management. (New patch 11) - Improve iopf_queue_flush_dev(). (New patch 12) v4: https://lore.kernel.org/linux-iommu/20230825023026.132919-1-baolu.lu@linux.intel.com/ - Merge iommu_fault_event and iopf_fault. They are duplicate. - Move iommu_report_device_fault() and iommu_page_response() to io-pgfault.c. - Move iommu_sva_domain_alloc() to iommu-sva.c. - Add group->domain and use it directly in sva fault handler. - Misc code refactoring and refining. v3: https://lore.kernel.org/linux-iommu/20230817234047.195194-1-baolu.lu@linux.intel.com/ - Convert the fault data structures from uAPI to kAPI. - Merge iopf_device_param into iommu_fault_param. - Add debugging on domain lifetime for iopf. - Remove patch "iommu: Change the return value of dev_iommu_get()". - Remove patch "iommu: Add helper to set iopf handler for domain". - Misc code refactoring and refining. v2: https://lore.kernel.org/linux-iommu/20230727054837.147050-1-baolu.lu@linux.intel.com/ - Remove unrecoverable fault data definition as suggested by Kevin. - Drop the per-device fault cookie code considering that doesn't make much sense for SVA. - Make the IOMMU page fault handling framework generic. So that it can available for use cases other than SVA. v1: https://lore.kernel.org/linux-iommu/20230711010642.19707-1-baolu.lu@linux.intel.com/ Lu Baolu (16): iommu: Move iommu fault data to linux/iommu.h iommu/arm-smmu-v3: Remove unrecoverable faults reporting iommu: Remove unrecoverable fault data iommu: Cleanup iopf data structure definitions iommu: Merge iopf_device_param into iommu_fault_param iommu: Remove iommu_[un]register_device_fault_handler() iommu: Merge iommu_fault_event and iopf_fault iommu: Prepare for separating SVA and IOPF iommu: Make iommu_queue_iopf() more generic iommu: Separate SVA and IOPF iommu: Refine locking for per-device fault data management iommu: Use refcount for fault data access iommu: Improve iopf_queue_remove_device() iommu: Track iopf group instead of last fault iommu: Make iopf_group_response() return void iommu: Make iommu_report_device_fault() return void include/linux/iommu.h | 262 +++++++--- drivers/iommu/intel/iommu.h | 4 +- drivers/iommu/iommu-sva.h | 71 --- include/uapi/linux/iommu.h | 161 ------ .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 14 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 103 ++-- drivers/iommu/intel/iommu.c | 28 +- drivers/iommu/intel/svm.c | 41 +- drivers/iommu/io-pgfault.c | 473 ++++++++++-------- drivers/iommu/iommu-sva.c | 71 ++- drivers/iommu/iommu.c | 233 --------- MAINTAINERS | 1 - drivers/iommu/Kconfig | 4 + drivers/iommu/Makefile | 3 +- drivers/iommu/intel/Kconfig | 1 + 15 files changed, 583 insertions(+), 887 deletions(-) delete mode 100644 drivers/iommu/iommu-sva.h delete mode 100644 include/uapi/linux/iommu.h