This is version 3 of the core changes for Shared Virtual Addressing in the IOMMU. It provides an API for sharing process address spaces with devices, using for example PCI PASID and PRI.
This time I didn't append the VFIO and SMMUv3 example users. A smaller series is easier for me to manage and may be less intimidating for reviewers. If you're adding or updating SVA support to your IOMMU or device driver, you can find my complete patch stack at [1] for inspiration. Changes to patches 1-9 address feedback from v2 [2]. Mostly small tweaks and comments, that I tried to detail on each patch. I added patch 10/10 from Jordan Crouse, for managing PASID without sharing process address spaces. This interface might get superseded by auxiliary domains [3], since they are more suitable than io_mm for Intel vt-d's mdev virtualization. Auxiliary domains reuse existing iommu_map/ iommu_unmap/etc ops instead of introducing new ones, so even though it's more invasive, I tend to prefer that solution. But since we need something for testing right now, I'm appending patch 10 to the series. The series depends on Jacob Pan's patches for fault reporting [4]. iommu: introduce device fault data driver core: add per device iommu param iommu: add a timeout parameter for prq response iommu: introduce device fault report API iommu: introduce page response function [1] git://linux-arm.org/linux-jpb.git sva/v3 [2] https://www.spinics.net/lists/kvm/msg168742.html [3] https://lwn.net/ml/linux-kernel/20180830040922.30426-1-baolu...@linux.intel.com/ [4] https://lwn.net/ml/linux-kernel/1526072055-86990-1-git-send-email-jacob.jun.pan%40linux.intel.com/ Jean-Philippe Brucker (10): iommu: Introduce Shared Virtual Addressing API iommu/sva: Bind process address spaces to devices iommu/sva: Manage process address spaces iommu/sva: Add a mm_exit callback for device drivers iommu/sva: Track mm changes with an MMU notifier iommu/sva: Search mm by PASID iommu: Add a page fault handler iommu/iopf: Handle mm faults iommu/sva: Register page fault handler iommu/sva: Add support for private PASIDs drivers/iommu/Kconfig | 9 + drivers/iommu/Makefile | 2 + drivers/iommu/io-pgfault.c | 464 ++++++++++++++++++ drivers/iommu/iommu-sva.c | 967 +++++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 143 +++++- include/linux/iommu.h | 289 ++++++++++- 6 files changed, 1855 insertions(+), 19 deletions(-) create mode 100644 drivers/iommu/io-pgfault.c create mode 100644 drivers/iommu/iommu-sva.c -- 2.18.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
