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@xxxxxxxxxx/ 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
