Implement the virtio-iommu driver, following specification v0.8 [1]. Changes since v2 [2]: * Patches 2-4 allow virtio-iommu to use the PCI transport, since QEMU would like to phase out the MMIO transport. This produces a complex topology where the programming interface of the IOMMU could appear lower than the endpoints that it translates. It's not unheard of (e.g. AMD IOMMU), and the guest easily copes with this. The "Firmware description" section of the specification has been updated with all combinations of PCI, MMIO and DT, ACPI. * Fix structures layout, they don't need the "packed" attribute anymore. * While we're at it, add domain parameter to DETACH request, and leave some padding. This way the next version, that adds PASID support, won't have to introduce a "DETACH2" request to stay backward compatible. * Require virtio device 1.0+. Remove legacy transport notes from the specification. * Request timeout is now only enabled with DEBUG. * The patch for VFIO Kconfig (previously patch 5/5) is in next. You can find Linux driver and kvmtool device on branches virtio-iommu/v0.8 [3] (currently based on 4.19-rc7 but rebasing onto next only produced a trivial conflict). Branch virtio-iommu/devel contains a few patches that I'd like to send once the base is upstream: * virtio-iommu as a module. It got *much* nicer after Rob's probe deferral rework, but I still have a bug to fix when re-loading the virtio-iommu module. * ACPI support requires a minor IORT spec update (reservation of node ID). I think it should be easier to obtain once the device and drivers are upstream. [1] Virtio-iommu specification v0.8, diff from v0.7, and sources git://linux-arm.org/virtio-iommu.git virtio-iommu/v0.8 http://jpbrucker.net/virtio-iommu/spec/v0.8/virtio-iommu-v0.8.pdf http://jpbrucker.net/virtio-iommu/spec/diffs/virtio-iommu-pdf-diff-v0.7-v0.8.pdf [2] [PATCH v2 0/5] Add virtio-iommu driver https://www.spinics.net/lists/kvm/msg170655.html [3] git://linux-arm.org/linux-jpb.git virtio-iommu/v0.8 git://linux-arm.org/kvmtool-jpb.git virtio-iommu/v0.8 Jean-Philippe Brucker (7): dt-bindings: virtio-mmio: Add IOMMU description dt-bindings: virtio: Add virtio-pci-iommu node PCI: OF: allow endpoints to bypass the iommu PCI: OF: Initialize dev->fwnode appropriately iommu: Add virtio-iommu driver iommu/virtio: Add probe request iommu/virtio: Add event queue .../devicetree/bindings/virtio/iommu.txt | 66 + .../devicetree/bindings/virtio/mmio.txt | 30 + MAINTAINERS | 7 + drivers/iommu/Kconfig | 11 + drivers/iommu/Makefile | 1 + drivers/iommu/virtio-iommu.c | 1171 +++++++++++++++++ drivers/pci/of.c | 14 +- include/uapi/linux/virtio_ids.h | 1 + include/uapi/linux/virtio_iommu.h | 159 +++ 9 files changed, 1457 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/virtio/iommu.txt create mode 100644 drivers/iommu/virtio-iommu.c create mode 100644 include/uapi/linux/virtio_iommu.h -- 2.19.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm