Hi Jean, On 3/16/21 8:16 PM, Jean-Philippe Brucker wrote: > 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.gh702...@redhat.com/ > [3] https://jpbrucker.net/virtio-iommu/viot/viot-v9.pdf > [4] > https://lore.kernel.org/linux-iommu/20191122105000.800410-1-jean-phili...@linaro.org/ > [5] > https://lore.kernel.org/linux-iommu/20200228172537.377327-1-jean-phili...@linaro.org/ > [6] > https://lore.kernel.org/linux-iommu/20200821131540.2801801-1-jean-phili...@linaro.org/
Do you have a qemu branch to share for us to start exercising different kinds of topology? Thanks Eric > > 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 > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
