Implement a virtio-iommu device and translate DMA traffic from vfio and virtio devices. Virtio needed some rework to support scatter-gather accesses to vring and buffers at page granularity. Patch 3 implements the actual virtio-iommu device. Adding --viommu on the command-line now inserts a virtual IOMMU in front of all virtio and vfio devices: $ lkvm run -k Image --console virtio -p console=hvc0 \ --viommu --vfio 0 --vfio 4 --irqchip gicv3-its ... [ 2.998949] virtio_iommu virtio0: probe successful [ 3.007739] virtio_iommu virtio1: probe successful ... [ 3.165023] iommu: Adding device 0000:00:00.0 to group 0 [ 3.536480] iommu: Adding device 10200.virtio to group 1 [ 3.553643] iommu: Adding device 10600.virtio to group 2 [ 3.570687] iommu: Adding device 10800.virtio to group 3 [ 3.627425] iommu: Adding device 10a00.virtio to group 4 [ 7.823689] iommu: Adding device 0000:00:01.0 to group 5 ... Patches 13 and 14 add debug facilities. Some statistics are gathered for each address space and can be queried via the debug builtin: $ lkvm debug -n guest-1210 --iommu stats iommu 0 "viommu-vfio" kicks 1255 requests 1256 ioas 1 maps 7 unmaps 4 resident 2101248 ioas 6 maps 623 unmaps 620 resident 16384 iommu 1 "viommu-virtio" kicks 11426 requests 11431 ioas 2 maps 2836 unmaps 2835 resident 8192 accesses 2836 ... This is based on the VFIO patchset[1], itself based on Andre's ITS work. The VFIO bits have only been tested on a software model and are unlikely to work on actual hardware, but I also tested virtio on an ARM Juno. [1] http://www.spinics.net/lists/kvm/msg147624.html Jean-Philippe Brucker (15): virtio: synchronize virtio-iommu headers with Linux FDT: (re)introduce a dynamic phandle allocator virtio: add virtio-iommu Add a simple IOMMU iommu: describe IOMMU topology in device-trees irq: register MSI doorbell addresses virtio: factor virtqueue initialization virtio: add vIOMMU instance for virtio devices virtio: access vring and buffers through IOMMU mappings virtio-pci: translate MSIs with the virtual IOMMU virtio: set VIRTIO_F_IOMMU_PLATFORM when necessary vfio: add support for virtual IOMMU virtio-iommu: debug via IPC virtio-iommu: implement basic debug commands virtio: use virtio-iommu when available Makefile | 3 + arm/gic.c | 4 + arm/include/arm-common/fdt-arch.h | 2 +- arm/pci.c | 49 ++- builtin-debug.c | 8 +- builtin-run.c | 2 + fdt.c | 35 ++ include/kvm/builtin-debug.h | 6 + include/kvm/devices.h | 4 + include/kvm/fdt.h | 20 + include/kvm/iommu.h | 105 +++++ include/kvm/irq.h | 3 + include/kvm/kvm-config.h | 1 + include/kvm/vfio.h | 2 + include/kvm/virtio-iommu.h | 15 + include/kvm/virtio-mmio.h | 1 + include/kvm/virtio-pci.h | 2 + include/kvm/virtio.h | 137 +++++- include/linux/virtio_config.h | 74 ++++ include/linux/virtio_ids.h | 4 + include/linux/virtio_iommu.h | 142 ++++++ iommu.c | 240 ++++++++++ irq.c | 35 ++ kvm-ipc.c | 43 +- mips/include/kvm/fdt-arch.h | 2 +- powerpc/include/kvm/fdt-arch.h | 2 +- vfio.c | 281 +++++++++++- virtio/9p.c | 7 +- virtio/balloon.c | 7 +- virtio/blk.c | 10 +- virtio/console.c | 7 +- virtio/core.c | 240 ++++++++-- virtio/iommu.c | 902 ++++++++++++++++++++++++++++++++++++++ virtio/mmio.c | 44 +- virtio/net.c | 8 +- virtio/pci.c | 61 ++- virtio/rng.c | 6 +- virtio/scsi.c | 6 +- x86/include/kvm/fdt-arch.h | 2 +- 39 files changed, 2389 insertions(+), 133 deletions(-) create mode 100644 fdt.c create mode 100644 include/kvm/iommu.h create mode 100644 include/kvm/virtio-iommu.h create mode 100644 include/linux/virtio_config.h create mode 100644 include/linux/virtio_iommu.h create mode 100644 iommu.c create mode 100644 virtio/iommu.c -- 2.12.1 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
