[PATCH 0/6] 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.

With a simple configuration the table contains a virtio-iommu-pci node
and a pci-range node:

        qemu-system-aarch64 -M virt -bios QEMU_EFI.fd
          -device virtio-iommu ...

        $ iasl -d ...
        [000h 0000   4]                    Signature : "VIOT"

        [024h 0036   2]                   Node count : 0002
        [026h 0038   2]                  Node offset : 0030

        [030h 0048   1]                         Type : 03 [VirtIO-PCI IOMMU]
        [032h 0050   2]                       Length : 0010
        [034h 0052   2]                  PCI Segment : 0000
        [036h 0054   2]               PCI BDF number : 0030

        [040h 0064   1]                         Type : 01 [PCI Range]
        [042h 0066   2]                       Length : 0018
        [044h 0068   4]               Endpoint start : 00000000
        [048h 0072   2]            PCI Segment start : 0000
        [04Ah 0074   2]              PCI Segment end : 0000
        [04Ch 0076   2]                PCI BDF start : 0000
        [04Eh 0078   2]                  PCI BDF end : 00FF
        [050h 0080   2]                  Output node : 0030

With a more complex topology multiple PCI Range nodes describe the system:

        qemu-system-aarch64 -bios QEMU_EFI.fd -device virtio-iommu
          -M virt,default_bus_bypass_iommu=true
          -device pxb-pcie,bus_nr=0x10,id=pcie.1000,bus=pcie.0
          -device pxb-pcie,bus_nr=0x20,id=pcie.2000,bus=pcie.0,bypass_iommu=true
          -device pxb-pcie,bus_nr=0x30,id=pcie.3000,bus=pcie.0

        [024h 0036   2]                   Node count : 0003
        [026h 0038   2]                  Node offset : 0030

        [030h 0048   1]                         Type : 03 [VirtIO-PCI IOMMU]
        [032h 0050   2]                       Length : 0010
        [034h 0052   2]                  PCI Segment : 0000
        [036h 0054   2]               PCI BDF number : 0020

        [040h 0064   1]                         Type : 01 [PCI Range]
        [042h 0066   2]                       Length : 0018
        [044h 0068   4]               Endpoint start : 00003000
        [048h 0072   2]            PCI Segment start : 0000
        [04Ah 0074   2]              PCI Segment end : 0000
        [04Ch 0076   2]                PCI BDF start : 3000
        [04Eh 0078   2]                  PCI BDF end : 32FF
        [050h 0080   2]                  Output node : 0030

        [058h 0088   1]                         Type : 01 [PCI Range]
        [05Ah 0090   2]                       Length : 0018
        [05Ch 0092   4]               Endpoint start : 00001000
        [060h 0096   2]            PCI Segment start : 0000
        [062h 0098   2]              PCI Segment end : 0000
        [064h 0100   2]                PCI BDF start : 1000
        [066h 0102   2]                  PCI BDF end : 11FF
        [068h 0104   2]                  Output node : 0030


The VIOT table description will be in the next release of ACPI.
In the meantime you can find a description at
https://jpbrucker.net/virtio-iommu/viot/viot-v9.pdf
Linux support for VIOT was added in version 5.14

Eric Auger (1):
  pc: Allow instantiating a virtio-iommu device

Jean-Philippe Brucker (5):
  acpi: Add VIOT structure definitions
  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
  pc: Add VIOT table for virtio-iommu

 hw/acpi/viot.h               | 13 ++++++
 include/hw/acpi/acpi-defs.h  | 60 ++++++++++++++++++++++++++
 include/hw/i386/pc.h         |  2 +
 hw/acpi/viot.c               | 82 ++++++++++++++++++++++++++++++++++++
 hw/arm/virt-acpi-build.c     |  7 +++
 hw/arm/virt.c                | 10 +----
 hw/i386/acpi-build.c         |  5 +++
 hw/i386/pc.c                 | 18 +++++++-
 hw/virtio/virtio-iommu-pci.c |  7 ---
 hw/acpi/Kconfig              |  4 ++
 hw/acpi/meson.build          |  1 +
 hw/arm/Kconfig               |  1 +
 hw/i386/Kconfig              |  1 +
 13 files changed, 195 insertions(+), 16 deletions(-)
 create mode 100644 hw/acpi/viot.h
 create mode 100644 hw/acpi/viot.c

-- 
2.32.0