[PATCH 0/5] [B-OEM]iommu: add kernel dma protection

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1820153

[Impact]
OS can use IOMMU to defend against DMA attacks from a PCI device like thunderbolt one.
Intel adds DMA_CTRL_PLATFORM_OPT_IN_FLAG flag in DMAR ACPI table.
Use this flag to enable IOMMU and use _DSD to identify untrusted PCI devices.

[Fix]
Enable IOMMU when BIOS supports DMA opt in flag and ExternalFacingPort in _DSD.
Disable ATS on the untrusted PCI device.

[Test]
Tested on 2 Intel platforms that supports DMA opt in flag with a thunderbolt dock station.
iommu enabled as expected with this fix.

[Regression Potential]
Upstream fix, Verified on supported platforms, no affection on not supported platforms.
Backported changes are fairly minimal.

These patches are included in 5.0 kernel, disco is good.

Erik Schmauss (1):
  ACPICA: AML parser: attempt to continue loading table after error

Lu Baolu (1):
  iommu/vt-d: Force IOMMU on for platform opt in hint

Mika Westerberg (3):
  PCI / ACPI: Identify untrusted PCI devices
  iommu/vt-d: Do not enable ATS for untrusted devices
  thunderbolt: Export IOMMU based DMA protection support to userspace

 .../ABI/testing/sysfs-bus-thunderbolt         |  9 +++
 Documentation/admin-guide/thunderbolt.rst     | 20 +++++++
 drivers/acpi/acpica/psloop.c                  | 51 ++++++++++++++++-
 drivers/acpi/acpica/psobject.c                | 30 ++++++++++
 drivers/acpi/property.c                       | 11 ++++
 drivers/iommu/dmar.c                          | 25 +++++++++
 drivers/iommu/intel-iommu.c                   | 56 ++++++++++++++++++-
 drivers/pci/pci-acpi.c                        | 19 +++++++
 drivers/pci/probe.c                           | 15 +++++
 drivers/thunderbolt/domain.c                  | 17 ++++++
 include/linux/dmar.h                          |  8 +++
 include/linux/pci.h                           |  8 +++
 12 files changed, 265 insertions(+), 4 deletions(-)

-- 
2.17.1