On Fri, Apr 23, 2021 at 01:38:31PM +0200, Jean-Philippe Brucker wrote:

Add a driver for the ACPI VIOT table, which provides topology
information for para-virtual platforms. Enable virtio-iommu on
non-devicetree platforms, including x86.

Acked-by: Michael S. Tsirkin <mst@redhat.com>

Mostly ACPI stuff so I assume it's best to merge through that tree.

Since v1 [1]:
* The VIOT header definitions have been picked for v5.13
* Share more code with IORT. Patches 1 and 2 extract the common code
  from IORT.
* Simplify the VIOT driver. Use the existing fwnode infrastructure
  instead of adding hooks to the IOMMU driver.

You can find a QEMU implementation at [2], with extra support for
testing all VIOT nodes including MMIO-based endpoints and IOMMU. This
series, based on linux-next, is at [3]

[1] https://lore.kernel.org/linux-iommu/20210316191652.3401335-1-jean-philippe@linaro.org/ (local)
[2] https://jpbrucker.net/git/qemu/log/?h=virtio-iommu/acpi
[3] https://jpbrucker.net/git/linux/log/?h=virtio-iommu/acpi

Jean-Philippe Brucker (6):
  ACPI: arm64: Move DMA setup operations out of IORT
  ACPI: Move IOMMU setup code out of IORT
  ACPI: Add driver for the VIOT table
  iommu/dma: Pass address limit rather than size to
    iommu_setup_dma_ops()
  iommu/dma: Simplify calls to iommu_setup_dma_ops()
  iommu/virtio: Enable x86 support

 drivers/acpi/Kconfig         |   3 +
 drivers/iommu/Kconfig        |   4 +-
 drivers/acpi/Makefile        |   2 +
 drivers/acpi/arm64/Makefile  |   1 +
 include/acpi/acpi_bus.h      |   3 +
 include/linux/acpi.h         |   3 +
 include/linux/acpi_iort.h    |  14 +-
 include/linux/acpi_viot.h    |  19 ++
 include/linux/dma-iommu.h    |   4 +-
 arch/arm64/mm/dma-mapping.c  |   2 +-
 drivers/acpi/arm64/dma.c     |  50 +++++
 drivers/acpi/arm64/iort.c    | 129 ++-----------
 drivers/acpi/bus.c           |   2 +
 drivers/acpi/scan.c          |  60 +++++-
 drivers/acpi/viot.c          | 350 +++++++++++++++++++++++++++++++++++
 drivers/iommu/amd/iommu.c    |   9 +-
 drivers/iommu/dma-iommu.c    |  17 +-
 drivers/iommu/intel/iommu.c  |  10 +-
 drivers/iommu/virtio-iommu.c |   8 +
 MAINTAINERS                  |   8 +
 20 files changed, 548 insertions(+), 150 deletions(-)
 create mode 100644 include/linux/acpi_viot.h
 create mode 100644 drivers/acpi/arm64/dma.c
 create mode 100644 drivers/acpi/viot.c

-- 
2.31.1

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