[PATCH v2 0/4] PCI, iommu: Factor 'untrusted' check for ATS enablement

Jean-Philippe Brucker jean-philippe at linaro.org
Wed May 20 15:21:59 UTC 2020


IOMMU drivers currently check themselves if a device is untrusted
(plugged into an external-facing port) before enabling ATS. Move the
check to drivers/pci. The only functional change should be to the AMD
IOMMU driver. With this change all IOMMU drivers block 'Translated' PCIe
transactions and Translation Requests from untrusted devices.

Since v1 [1] I added tags, addressed comments on patches 1 and 3, and
fixed a regression in patch 3.

[1] https://lore.kernel.org/linux-iommu/20200515104359.1178606-1-jean-philippe@linaro.org/

Jean-Philippe Brucker (4):
  PCI/ATS: Only enable ATS for trusted devices
  iommu/amd: Use pci_ats_supported()
  iommu/arm-smmu-v3: Use pci_ats_supported()
  iommu/vt-d: Use pci_ats_supported()

 include/linux/pci-ats.h     |  3 +++
 drivers/iommu/amd_iommu.c   | 12 ++++--------
 drivers/iommu/arm-smmu-v3.c | 20 +++++++-------------
 drivers/iommu/intel-iommu.c |  9 +++------
 drivers/pci/ats.c           | 18 +++++++++++++++++-
 5 files changed, 34 insertions(+), 28 deletions(-)

-- 
2.26.2



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