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    Subject[PATCH v5 00/22] SMMUv3 Nested Stage Setup
    Date
    This series allows a virtualizer to program the nested stage mode.
    This is useful when both the host and the guest are exposed with
    an SMMUv3 and a PCI device is assigned to the guest using VFIO.

    In this mode, the physical IOMMU must be programmed to translate
    the two stages: the one set up by the guest (IOVA -> GPA) and the
    one set up by the host VFIO driver as part of the assignment process
    (GPA -> HPA).

    On Intel, this is traditionnaly achieved by combining the 2 stages
    into a single physical stage. However this relies on the capability
    to trap on each guest translation structure update. This is possible
    by using the VTD Caching Mode. Unfortunately the ARM SMMUv3 does
    not offer a similar mechanism.

    However, the ARM SMMUv3 architecture supports 2 physical stages! Those
    were devised exactly with that use case in mind. Assuming the HW
    implements both stages (optional), the guest now can use stage 1
    while the host uses stage 2.

    This assumes the virtualizer has means to propagate guest settings
    to the host SMMUv3 driver. This series brings this VFIO/IOMMU
    infrastructure. Those services are:
    - bind the guest stage 1 configuration to the stream table entry
    - propagate guest TLB invalidations
    - bind MSI IOVAs
    - propagate faults collected at physical level up to the virtualizer

    This series largely reuses the user API and infrastructure originally
    devised for SVA/SVM and patches submitted by Jacob, Yi Liu, Tianyu in
    [1-2] and Jean-Philippe [3-4].

    Best Regards

    Eric

    This series can be found at:
    https://github.com/eauger/linux/tree/v5.0-2stage-v5

    References:
    [1] [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual
    Address (SVA)
    https://lwn.net/Articles/754331/
    [2] [RFC PATCH 0/8] Shared Virtual Memory virtualization for VT-d
    (VFIO part)
    https://lists.linuxfoundation.org/pipermail/iommu/2017-April/021475.html
    [3] [v2,00/40] Shared Virtual Addressing for the IOMMU
    https://patchwork.ozlabs.org/cover/912129/
    [4] [PATCH v3 00/10] Shared Virtual Addressing for the IOMMU
    https://patchwork.kernel.org/cover/10608299/

    History:
    v4 -> v5:
    - fix bug reported by Vincent: fault handler unregistration now happens in
    vfio_pci_release
    - IOMMU_FAULT_PERM_* moved outside of struct definition + small
    uapi changes suggested by Kean-Philippe (except fetch_addr)
    - iommu: introduce device fault report API: removed the PRI part.
    - see individual logs for more details
    - reset the ste abort flag on detach

    v3 -> v4:
    - took into account Alex, jean-Philippe and Robin's comments on v3
    - rework of the smmuv3 driver integration
    - add tear down ops for msi binding and PASID table binding
    - fix S1 fault propagation
    - put fault reporting patches at the beginning of the series following
    Jean-Philippe's request
    - update of the cache invalidate and fault API uapis
    - VFIO fault reporting rework with 2 separate regions and one mmappable
    segment for the fault queue
    - moved to PATCH

    v2 -> v3:
    - When registering the S1 MSI binding we now store the device handle. This
    addresses Robin's comment about discimination of devices beonging to
    different S1 groups and using different physical MSI doorbells.
    - Change the fault reporting API: use VFIO_PCI_DMA_FAULT_IRQ_INDEX to
    set the eventfd and expose the faults through an mmappable fault region

    v1 -> v2:
    - Added the fault reporting capability
    - asid properly passed on invalidation (fix assignment of multiple
    devices)
    - see individual change logs for more info


    Eric Auger (13):
    iommu: Introduce bind/unbind_guest_msi
    vfio: VFIO_IOMMU_BIND/UNBIND_MSI
    iommu/smmuv3: Get prepared for nested stage support
    iommu/smmuv3: Implement attach/detach_pasid_table
    iommu/smmuv3: Implement cache_invalidate
    dma-iommu: Implement NESTED_MSI cookie
    iommu/smmuv3: Implement bind/unbind_guest_msi
    iommu/smmuv3: Report non recoverable faults
    vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type
    vfio-pci: Register an iommu fault handler
    vfio_pci: Allow to mmap the fault queue
    vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX
    vfio: Document nested stage control

    Jacob Pan (4):
    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

    Jean-Philippe Brucker (2):
    iommu/arm-smmu-v3: Link domains and devices
    iommu/arm-smmu-v3: Maintain a SID->device structure

    Liu, Yi L (3):
    iommu: Introduce cache_invalidate API
    vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE
    vfio: VFIO_IOMMU_CACHE_INVALIDATE

    Documentation/vfio.txt | 83 ++++
    drivers/iommu/arm-smmu-v3.c | 581 ++++++++++++++++++++++++++--
    drivers/iommu/dma-iommu.c | 145 ++++++-
    drivers/iommu/iommu.c | 201 +++++++++-
    drivers/vfio/pci/vfio_pci.c | 214 ++++++++++
    drivers/vfio/pci/vfio_pci_intrs.c | 19 +
    drivers/vfio/pci/vfio_pci_private.h | 18 +
    drivers/vfio/pci/vfio_pci_rdwr.c | 73 ++++
    drivers/vfio/vfio_iommu_type1.c | 158 ++++++++
    include/linux/device.h | 3 +
    include/linux/dma-iommu.h | 18 +
    include/linux/iommu.h | 143 +++++++
    include/uapi/linux/iommu.h | 233 +++++++++++
    include/uapi/linux/vfio.h | 102 +++++
    14 files changed, 1957 insertions(+), 34 deletions(-)
    create mode 100644 include/uapi/linux/iommu.h

    --
    2.20.1

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