Messages in this thread | | | From | Jacob Pan <> | Subject | [PATCH 00/18] Shared virtual address IOMMU and VT-d support | Date | Mon, 8 Apr 2019 16:59:15 -0700 |
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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
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.
Jacob Pan (15): ioasid: Add custom IOASID allocator ioasid: Convert ioasid_idr to XArray driver core: add per device iommu param iommu: introduce device fault data iommu: introduce device fault report API iommu: Introduce attach/detach_pasid_table API iommu/vt-d: Add custom allocator for IOASID iommu/vt-d: Replace Intel specific PASID allocator with IOASID iommu: Add guest PASID bind function iommu/vt-d: Move domain helper to header iommu/vt-d: Add nested translation support iommu/vt-d: Add bind guest PASID support iommu: add max num of cache and granu types iommu/vt-d: Support flushing more translation cache types iommu/vt-d: Add svm/sva invalidate function
Jean-Philippe Brucker (1): drivers core: Add I/O ASID allocator
Liu, Yi L (1): iommu: Introduce cache_invalidate API
Lu Baolu (1): iommu/vt-d: Enlightened PASID allocation
drivers/base/Kconfig | 7 ++ drivers/base/Makefile | 1 + drivers/base/ioasid.c | 211 +++++++++++++++++++++++++++++++++++++ drivers/iommu/Kconfig | 1 + drivers/iommu/dmar.c | 48 +++++++++ drivers/iommu/intel-iommu.c | 219 ++++++++++++++++++++++++++++++++++++-- drivers/iommu/intel-pasid.c | 191 +++++++++++++++++++++++++++++----- drivers/iommu/intel-pasid.h | 24 ++++- drivers/iommu/intel-svm.c | 217 +++++++++++++++++++++++++++++++++++--- drivers/iommu/iommu.c | 207 +++++++++++++++++++++++++++++++++++- include/linux/device.h | 3 + include/linux/intel-iommu.h | 40 +++++-- include/linux/intel-svm.h | 7 ++ include/linux/ioasid.h | 66 ++++++++++++ include/linux/iommu.h | 127 +++++++++++++++++++++++ include/uapi/linux/iommu.h | 248 ++++++++++++++++++++++++++++++++++++++++++++ 16 files changed, 1559 insertions(+), 58 deletions(-) create mode 100644 drivers/base/ioasid.c create mode 100644 include/linux/ioasid.h create mode 100644 include/uapi/linux/iommu.h
-- 2.7.4
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