[PATCH v4 00/11] virtio-iommu: Add ACPI support

[Jean-Philippe Brucker]

Allow instantiating a virtio-iommu device on ACPI systems by adding a
Virtual I/O Translation table (VIOT). Enable x86 support for VIOT.

Changes since v3 [1]:
* Cleaned the IOMMU-uniqueness checks. Added patch 6 to have a
  single check on x86.
* Added patch 5 that allows to gracefully propagate errors when setting
  resv_mem properties.
* Squashed table blobs into patch 11.
* Addressed all other comments from v3.

Caveats:

* Series depends on "acpi: refactor error prone build_header() and
  packed structures usage in ACPI tables" [2]

* Since virtio-iommu doesn't support boot-bypass at the moment, firmware
  can't access storage behind the IOMMU to load bootloader or kernel.
  This will be solved by another series currently in flight [3]. In the
  meantime you can use a storage device that bypasses the IOMMU such as
  virtio-blk-pci (without iommu_platform property) or a bypass bridge
  (docs/iommu-bypass.txt).

You can find a description of the VIOT table, which will be included in
next ACPI version, here: https://jpbrucker.net/virtio-iommu/viot/viot-v9.pdf

[1] 
https://lore.kernel.org/qemu-devel/20210914142004.2433568-1-jean-philippe@linaro.org/
[2] 
https://lore.kernel.org/qemu-devel/20210924122802.1455362-1-imammedo@redhat.com/
[3] 
https://lore.kernel.org/qemu-devel/20210930185050.262759-1-jean-philippe@linaro.org/

Jean-Philippe Brucker (11):
  hw/acpi: Add VIOT table
  hw/arm/virt-acpi-build: Add VIOT table for virtio-iommu
  hw/arm/virt: Remove device tree restriction for virtio-iommu
  hw/arm/virt: Reject instantiation of multiple IOMMUs
  hw/arm/virt: Use object_property_set instead of qdev_prop_set
  hw/i386: Move vIOMMU uniqueness check into pc.c
  pc: Allow instantiating a virtio-iommu device
  tests/acpi: allow updates of VIOT expected data files
  tests/acpi: add test cases for VIOT
  tests/acpi: add expected blob for VIOT test on virt machine
  tests/acpi: add expected blobs for VIOT test on q35 machine

 hw/acpi/viot.h                 |  13 ++++
 include/hw/i386/pc.h           |   2 +
 hw/acpi/viot.c                 | 112 +++++++++++++++++++++++++++++++++
 hw/arm/virt-acpi-build.c       |   7 +++
 hw/arm/virt.c                  |  20 +++---
 hw/i386/acpi-build.c           |   5 ++
 hw/i386/pc.c                   |  30 ++++++++-
 hw/i386/x86-iommu.c            |   6 --
 hw/virtio/virtio-iommu-pci.c   |   7 ---
 tests/qtest/bios-tables-test.c |  38 +++++++++++
 hw/acpi/Kconfig                |   4 ++
 hw/acpi/meson.build            |   1 +
 hw/arm/Kconfig                 |   1 +
 hw/i386/Kconfig                |   1 +
 tests/data/acpi/q35/DSDT.viot  | Bin 0 -> 9398 bytes
 tests/data/acpi/q35/VIOT.viot  | Bin 0 -> 112 bytes
 tests/data/acpi/virt/VIOT      | Bin 0 -> 88 bytes
 17 files changed, 223 insertions(+), 24 deletions(-)
 create mode 100644 hw/acpi/viot.h
 create mode 100644 hw/acpi/viot.c
 create mode 100644 tests/data/acpi/q35/DSDT.viot
 create mode 100644 tests/data/acpi/q35/VIOT.viot
 create mode 100644 tests/data/acpi/virt/VIOT

-- 
2.33.0