On Fri, Aug 21, 2020 at 03:15:34PM +0200, Jean-Philippe Brucker wrote:
> Add a topology description to the virtio-iommu driver and enable x86
> platforms.
> 
> Since [v2] we have made some progress on adding ACPI support for
> virtio-iommu, which is the preferred boot method on x86. It will be a
> new vendor-agnostic table describing para-virtual topologies in a
> minimal format. However some platforms don't use either ACPI or DT for
> booting (for example microvm), and will need the alternative topology
> description method proposed here. In addition, since the process to get
> a new ACPI table will take a long time, this provides a boot method even
> to ACPI-based platforms, if only temporarily for testing and
> development.

OK should I park this in next now? Seems appropriate ...

> v3:
> * Add patch 1 that moves virtio-iommu to a subfolder.
> * Split the rest:
>   * Patch 2 adds topology-helper.c, which will be shared with the ACPI
>     support.
>   * Patch 4 adds definitions.
>   * Patch 5 adds parser in topology.c.
> * Address other comments.
> 
> Linux and QEMU patches available at:
> https://jpbrucker.net/git/linux virtio-iommu/devel
> https://jpbrucker.net/git/qemu virtio-iommu/devel
> 
> [spec] https://lists.oasis-open.org/archives/virtio-dev/202008/msg00067.html
> [v2] 
> https://lore.kernel.org/linux-iommu/20200228172537.377327-1-jean-phili...@linaro.org/
> [v1] 
> https://lore.kernel.org/linux-iommu/20200214160413.1475396-1-jean-phili...@linaro.org/
> [rfc] 
> https://lore.kernel.org/linux-iommu/20191122105000.800410-1-jean-phili...@linaro.org/
> 
> Jean-Philippe Brucker (6):
>   iommu/virtio: Move to drivers/iommu/virtio/
>   iommu/virtio: Add topology helpers
>   PCI: Add DMA configuration for virtual platforms
>   iommu/virtio: Add topology definitions
>   iommu/virtio: Support topology description in config space
>   iommu/virtio: Enable x86 support
> 
>  drivers/iommu/Kconfig                     |  18 +-
>  drivers/iommu/Makefile                    |   3 +-
>  drivers/iommu/virtio/Makefile             |   4 +
>  drivers/iommu/virtio/topology-helpers.h   |  50 +++++
>  include/linux/virt_iommu.h                |  15 ++
>  include/uapi/linux/virtio_iommu.h         |  44 ++++
>  drivers/iommu/virtio/topology-helpers.c   | 196 ++++++++++++++++
>  drivers/iommu/virtio/topology.c           | 259 ++++++++++++++++++++++
>  drivers/iommu/{ => virtio}/virtio-iommu.c |   4 +
>  drivers/pci/pci-driver.c                  |   5 +
>  MAINTAINERS                               |   3 +-
>  11 files changed, 597 insertions(+), 4 deletions(-)
>  create mode 100644 drivers/iommu/virtio/Makefile
>  create mode 100644 drivers/iommu/virtio/topology-helpers.h
>  create mode 100644 include/linux/virt_iommu.h
>  create mode 100644 drivers/iommu/virtio/topology-helpers.c
>  create mode 100644 drivers/iommu/virtio/topology.c
>  rename drivers/iommu/{ => virtio}/virtio-iommu.c (99%)
> 
> -- 
> 2.28.0
> 
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> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

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