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 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 ~ 11] Separate SVA and IOPF. Make IOPF a generic page fault handling framework. 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-v3 Change log: v3: - 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@xxxxxxxxxxxxxxx/ - 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 avaible for use cases other than SVA. v1: https://lore.kernel.org/linux-iommu/20230711010642.19707-1-baolu.lu@xxxxxxxxxxxxxxx/ Lu Baolu (11): 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: Prepare for separating SVA and IOPF iommu: Move iopf_handler() to iommu-sva.c iommu: Make iommu_queue_iopf() more generic iommu: Add debugging on domain lifetime for iopf iommu: Separate SVA and IOPF in Makefile and Kconfig include/linux/iommu.h | 202 ++++++++++++++--- 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 | 47 ++-- drivers/iommu/intel/iommu.c | 25 +-- drivers/iommu/intel/svm.c | 1 - drivers/iommu/io-pgfault.c | 208 ++++++++---------- drivers/iommu/iommu-sva.c | 49 ++++- drivers/iommu/iommu.c | 132 +++-------- MAINTAINERS | 1 - drivers/iommu/Kconfig | 4 + drivers/iommu/Makefile | 3 +- drivers/iommu/intel/Kconfig | 1 + 14 files changed, 362 insertions(+), 557 deletions(-) delete mode 100644 drivers/iommu/iommu-sva.h delete mode 100644 include/uapi/linux/iommu.h -- 2.34.1
