[PATCH ats_vtd v5 00/22] ATS support for VT-d

[CLEMENT MATHIEU--DRIF]

From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>

This series belongs to a list of series that add SVM support for VT-d.

As a starting point, we use the series called 'intel_iommu: Enable stage-1 
translation' (rfc2) by Zhenzhong Duan and Yi Liu.

Here we focus on the implementation of ATS support in the IOMMU and on a 
PCI-level
API for ATS to be used by virtual devices.

This work is based on the VT-d specification version 4.1 (March 2023).
Here is a link to a GitHub repository where you can find the following elements 
:
    - Qemu with all the patches for SVM
        - ATS
        - PRI
        - Device IOTLB invalidations
        - Requests with already translated addresses
    - A demo device
    - A simple driver for the demo device
    - A userspace program (for testing and demonstration purposes)

https://github.com/BullSequana/Qemu-in-guest-SVM-demo

v2
    - handle huge pages better by detecting the page table level at which the 
translation errors occur
    - Changes after review by ZhenZhong Duan :
        - Set the access bit after checking permissions
        - helper for PASID and ATS : make the commit message more accurate 
('present' replaced with 'enabled')
        - pcie_pasid_init: add PCI_PASID_CAP_WIDTH_SHIFT and use it instead of 
PCI_EXT_CAP_PASID_SIZEOF for shifting the pasid width when preparing the 
capability register
        - pci: do not check pci_bus_bypass_iommu after calling 
pci_device_get_iommu_bus_devfn
        - do not alter formatting of IOMMUTLBEntry declaration
        - vtd_iova_fl_check_canonical : directly use s->aw_bits instead of aw 
for the sake of clarity

v3
    - rebase on new version of Zhenzhong's flts implementation
    - fix the atc lookup operation (check the mask before returning an entry)
    - add a unit test for the ATC
    - store a user pointer in the iommu notifiers to simplify the 
implementation of svm devices
    Changes after review by Zhenzhong :
        - store the input pasid instead of rid2pasid when returning an entry 
after a translation
        - split the ATC implementation and its unit tests

v4
    Changes after internal review
        - Fix the nowrite optimization, an ATS translation without the nowrite 
flag should not fail when the write permission is not set

v5
    Changes after review by Philippe :
        - change the type of 'level' to unsigned in vtd_lookup_iotlb



Clément Mathieu--Drif (22):
  intel_iommu: fix FRCD construction macro.
  intel_iommu: make types match
  intel_iommu: return page walk level even when the translation fails
  intel_iommu: do not consider wait_desc as an invalid descriptor
  memory: add permissions in IOMMUAccessFlags
  pcie: add helper to declare PASID capability for a pcie device
  pcie: helper functions to check if PASID and ATS are enabled
  intel_iommu: declare supported PASID size
  pci: cache the bus mastering status in the device
  pci: add IOMMU operations to get address spaces and memory regions
    with PASID
  memory: store user data pointer in the IOMMU notifiers
  pci: add a pci-level initialization function for iommu notifiers
  intel_iommu: implement the get_address_space_pasid iommu operation
  intel_iommu: implement the get_memory_region_pasid iommu operation
  memory: Allow to store the PASID in IOMMUTLBEntry
  intel_iommu: fill the PASID field when creating an instance of
    IOMMUTLBEntry
  atc: generic ATC that can be used by PCIe devices that support SVM
  atc: add unit tests
  memory: add an API for ATS support
  pci: add a pci-level API for ATS
  intel_iommu: set the address mask even when a translation fails
  intel_iommu: add support for ATS

 hw/i386/intel_iommu.c                     | 142 +++++-
 hw/i386/intel_iommu_internal.h            |   6 +-
 hw/pci/pci.c                              | 127 +++++-
 hw/pci/pcie.c                             |  42 ++
 include/exec/memory.h                     |  51 ++-
 include/hw/i386/intel_iommu.h             |   2 +-
 include/hw/pci/pci.h                      | 101 +++++
 include/hw/pci/pci_device.h               |   1 +
 include/hw/pci/pcie.h                     |   9 +-
 include/hw/pci/pcie_regs.h                |   3 +
 include/standard-headers/linux/pci_regs.h |   1 +
 system/memory.c                           |  20 +
 tests/unit/meson.build                    |   1 +
 tests/unit/test-atc.c                     | 527 ++++++++++++++++++++++
 util/atc.c                                | 211 +++++++++
 util/atc.h                                | 117 +++++
 util/meson.build                          |   1 +
 17 files changed, 1330 insertions(+), 32 deletions(-)
 create mode 100644 tests/unit/test-atc.c
 create mode 100644 util/atc.c
 create mode 100644 util/atc.h

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2.45.1