[PATCH 0/3] Add support for ACPI VIOT

Jean-Philippe Brucker
2021-03-16T19:18:46Z

Add a driver for the ACPI VIOT table, which enables virtio-iommu on
non-devicetree platforms, including x86. This series depends on the
ACPICA changes of patch 1, which will be included in next release [1]
and pulled into Linux.

The Virtual I/O Translation table (VIOT) describes the topology of
para-virtual I/O translation devices and the endpoints they manage.
It was recently approved for inclusion into the ACPI standard [2].
A provisional version of the specification can be found at [3].

After discussing non-devicetree support for virtio-iommu at length
[4][5][6] we concluded that it should use this new ACPI table. And for
platforms that don't implement either devicetree or ACPI, a structure
that uses roughly the same format [6] can be built into the device.

[1] https://github.com/acpica/acpica/pull/666
[2] https://lore.kernel.org/linux-iommu/20210218233943.GH702808@redhat.com/
[3] https://jpbrucker.net/virtio-iommu/viot/viot-v9.pdf
[4] https://lore.kernel.org/linux-iommu/20191122105000.800410-1-jean-philippe@linaro.org/
[5] https://lore.kernel.org/linux-iommu/20200228172537.377327-1-jean-philippe@linaro.org/
[6] https://lore.kernel.org/linux-iommu/20200821131540.2801801-1-jean-philippe@linaro.org/

Jean-Philippe Brucker (3):
ACPICA: iASL: Add definitions for the VIOT table
ACPI: Add driver for the VIOT table
iommu/virtio: Enable x86 support

drivers/acpi/Kconfig | 3 +
drivers/iommu/Kconfig | 4 +-
drivers/acpi/Makefile | 2 +
include/acpi/actbl3.h | 67 ++++++
include/linux/acpi_viot.h | 26 +++
drivers/acpi/bus.c | 2 +
drivers/acpi/scan.c | 6 +
drivers/acpi/viot.c | 406 +++++++++++++++++++++++++++++++++++
drivers/iommu/virtio-iommu.c | 3 +
MAINTAINERS | 8 +
10 files changed, 526 insertions(+), 1 deletion(-)
create mode 100644 include/linux/acpi_viot.h
create mode 100644 drivers/acpi/viot.c

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2.30.2