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| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2020-05-20 18:22:01 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-05-27 15:35:41 +0300 |
| commit | 7a441b2110527851f630144ec76ab8409e1d6c61 (patch) | |
| tree | 31988a75f053d89f24a343d2ca8925786e459ec4 /drivers/iommu/arm-smmu-v3.c | |
| parent | 521376741b2c26fe53a1ec24d02da24d477eb739 (diff) | |
| download | linux-7a441b2110527851f630144ec76ab8409e1d6c61.tar.xz | |
iommu/amd: Use pci_ats_supported()
The pci_ats_supported() function checks if a device supports ATS and is
allowed to use it. In addition to checking that the device has an ATS
capability and that the global pci=noats is not set
(pci_ats_disabled()), it also checks if a device is untrusted.
A device is untrusted if it is plugged into an external-facing port such
as Thunderbolt and could be spoofing an existing device to exploit
weaknesses in the IOMMU configuration. By calling pci_ats_supported() we
keep DTE[I]=0 for untrusted devices and abort transactions with
Pretranslated Addresses.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200520152201.3309416-3-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/arm-smmu-v3.c')
0 files changed, 0 insertions, 0 deletions