Shared virtual address (SVA), a.k.a, Shared virtual memory (SVM) on Intel platforms allow address space sharing between device DMA and applications. SVA can reduce programming complexity and enhance security. This series is intended to enable SVA virtualization, i.e. shared guest application address space and physical device DMA address. Only IOMMU portion of the changes are included in this series. Additional support is needed in VFIO and QEMU (will be submitted separately) to complete this functionality.
To make incremental changes and reduce the size of each patchset. This series does not inlcude support for page request services. In VT-d implementation, PASID table is per device and maintained in the host. Guest PASID table is shadowed in VMM where virtual IOMMU is emulated. .-------------. .---------------------------. | vIOMMU | | Guest process CR3, FL only| | | '---------------------------' .----------------/ | PASID Entry |--- PASID cache flush - '-------------' | | | V | | CR3 in GPA '-------------' Guest ------| Shadow |--------------------------|-------- v v v Host .-------------. .----------------------. | pIOMMU | | Bind FL for GVA-GPA | | | '----------------------' .----------------/ | | PASID Entry | V (Nested xlate) '----------------\.------------------------------. | | |SL for GPA-HPA, default domain| | | '------------------------------' '-------------' Where: - FL = First level/stage one page tables - SL = Second level/stage two page tables This work is based on collaboration with other developers on the IOMMU mailing list. Notably, [1] [PATCH v6 00/22] SMMUv3 Nested Stage Setup by Eric Auger https://lkml.org/lkml/2019/3/17/124 [2] [RFC PATCH 2/6] drivers core: Add I/O ASID allocator by Jean-Philippe Brucker https://www.spinics.net/lists/iommu/msg30639.html [3] [RFC PATCH 0/5] iommu: APIs for paravirtual PASID allocation by Lu Baolu https://lkml.org/lkml/2018/11/12/1921 [4] [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual Address (SVA) https://lwn.net/Articles/754331/ There are roughly three parts: 1. Generic PASID allocator [1] with extension to support custom allocator 2. IOMMU cache invalidation passdown from guest to host 3. Guest PASID bind for nested translation All generic IOMMU APIs are reused from [1], which has a v7 just published with no real impact to the patches used here. It is worth noting that unlike sMMU nested stage setup, where PASID table is owned by the guest, VT-d PASID table is owned by the host, individual PASIDs are bound instead of the PASID table. This series is based on the new VT-d 3.0 Specification (https://software.intel.com/sites/default/files/managed/c5/15/vt-directed-io-spec.pdf). This is different than the older series in [4] which was based on the older specification that does not have scalable mode. ChangeLog: - V3 - Addressed thorough review comments from Eric Auger (Thank you!) - Moved IOASID allocator from driver core to IOMMU code per suggestion by Christoph Hellwig (https://lkml.org/lkml/2019/4/26/462) - Rebased on top of Jean's SVA API branch and Eric's v7[1] (git://linux-arm.org/linux-jpb.git sva/api) - All IOMMU APIs are unmodified (except the new bind guest PASID call in patch 9/16) - V2 - Rebased on Joerg's IOMMU x86/vt-d branch v5.1-rc4 - Integrated with Eric Auger's new v7 series for common APIs (https://github.com/eauger/linux/tree/v5.1-rc3-2stage-v7) - Addressed review comments from Andy Shevchenko and Alex Williamson on IOASID custom allocator. - Support multiple custom IOASID allocators (vIOMMUs) and dynamic registration. Jacob Pan (13): iommu: Introduce attach/detach_pasid_table API ioasid: Add custom IOASID allocator iommu/vt-d: Add custom allocator for IOASID iommu/vtd: Optimize tlb invalidation for vIOMMU iommu/vt-d: Replace Intel specific PASID allocator with IOASID iommu: Introduce guest PASID bind function iommu/vt-d: Move domain helper to header iommu/vt-d: Avoid duplicated code for PASID setup iommu/vt-d: Add nested translation helper function iommu/vt-d: Clean up for SVM device list iommu/vt-d: Add bind guest PASID support iommu/vt-d: Support flushing more translation cache types iommu/vt-d: Add svm/sva invalidate function Jean-Philippe Brucker (1): iommu: Add I/O ASID allocator Liu, Yi L (1): iommu: Introduce cache_invalidate API Lu Baolu (1): iommu/vt-d: Enlightened PASID allocation drivers/iommu/Kconfig | 7 ++ drivers/iommu/Makefile | 1 + drivers/iommu/dmar.c | 50 ++++++++ drivers/iommu/intel-iommu.c | 241 ++++++++++++++++++++++++++++++++++-- drivers/iommu/intel-pasid.c | 223 +++++++++++++++++++++++++-------- drivers/iommu/intel-pasid.h | 24 +++- drivers/iommu/intel-svm.c | 293 +++++++++++++++++++++++++++++++++++--------- drivers/iommu/ioasid.c | 265 +++++++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 53 ++++++++ include/linux/intel-iommu.h | 41 ++++++- include/linux/intel-svm.h | 7 ++ include/linux/ioasid.h | 67 ++++++++++ include/linux/iommu.h | 43 ++++++- include/uapi/linux/iommu.h | 140 +++++++++++++++++++++ 14 files changed, 1328 insertions(+), 127 deletions(-) create mode 100644 drivers/iommu/ioasid.c create mode 100644 include/linux/ioasid.h -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu