[Qemu-devel] [RFC v4 00/16] VIRTIO-IOMMU device

[Eric Auger <eric.auger@redhat.com>]

This series implements the virtio-iommu device.

This v4 is an upgrade to v0.4 spec [1] and applies on QEMU v2.10.0.
- probe request support although no reserved region is returned at
  the moment
- unmap semantics less strict, as specified in v0.4
- device registration, attach/detach revisited
- split into smaller patches to ease review
- propose a way to inform the IOMMU mr about the page_size_mask
  of underlying HW IOMMU, if any
- remove warning associated with the translation of the MSI doorbell

The device gets instantiated using the "-device virtio-iommu-device"
option. It currently works with ARM virt machine only, as the machine
must handle the dt binding between the virtio-mmio "iommu" node and
the PCI host bridge node.

The associated VHOST/VFIO adaptation is available on the branch
below but is not officially delivered as part of this series.

Best Regards

Eric

This series can be found at:
https://github.com/eauger/qemu/tree/v2.10.0-virtio-iommu-v4

References:
[1] [RFC] virtio-iommu version 0.4
    git://linux-arm.org/virtio-iommu.git branch viommu/v0.4

Testing:
- guest kernel with v0.4 virtio-iommu driver (4kB page)
- tested with guest using virtio-pci-net and vhost-net
  (,vhost=on/off,iommu_platform,disable-modern=off,disable-legacy=on  )
- tested with VFIO and guest assigned with 2 VFs
- tested with DPDK on guest with 2 assigned VFs

Not tested:
- hot-plug/hot-unplug of EP: not implemented

History:
v2-> v4:
- see above

v2 -> v3:
- rebase on top of 2.10-rc0 and especially
  [PATCH qemu v9 0/2] memory/iommu: QOM'fy IOMMU MemoryRegion
- add mutex init
- fix as->mappings deletion using g_tree_ref/unref
- when a dev is attached whereas it is already attached to
  another address space, first detach it
- fix some error values
- page_sizes = TARGET_PAGE_MASK;
- I haven't changed the unmap() semantics yet, waiting for the
  next virtio-iommu spec revision.

v1 -> v2:
- fix redifinition of viommu_as typedef

Eric Auger (16):
  update-linux-headers: import virtio_iommu.h
  linux-headers: Update for virtio-iommu
  virtio-iommu: add skeleton
  virtio-iommu: Decode the command payload
  virtio-iommu: Add the iommu regions
  virtio-iommu: Register attached devices
  virtio-iommu: Implement attach/detach command
  virtio-iommu: Implement map/unmap
  virtio-iommu: Implement translate
  virtio-iommu: Implement probe request
  hw/arm/virt: Add 2.11 machine type
  hw/arm/virt: Add virtio-iommu to the virt board
  memory.h: Add set_page_size_mask IOMMUMemoryRegion callback
  hw/vfio/common: Set the IOMMUMemoryRegion supported page sizes
  virtio-iommu: Implement set_page_size_mask
  hw/vfio/common: Do not print error when viommu translates into an mmio
    region

 hw/arm/virt.c                                 | 115 +++-
 hw/vfio/common.c                              |   7 +-
 hw/virtio/Makefile.objs                       |   1 +
 hw/virtio/trace-events                        |  24 +
 hw/virtio/virtio-iommu.c                      | 923 ++++++++++++++++++++++++++
 include/exec/memory.h                         |   4 +
 include/hw/arm/virt.h                         |   5 +
 include/hw/vfio/vfio-common.h                 |   1 +
 include/hw/virtio/virtio-iommu.h              |  61 ++
 include/standard-headers/linux/virtio_ids.h   |   1 +
 include/standard-headers/linux/virtio_iommu.h | 177 +++++
 linux-headers/linux/virtio_iommu.h            |   1 +
 scripts/update-linux-headers.sh               |   3 +
 13 files changed, 1312 insertions(+), 11 deletions(-)
 create mode 100644 hw/virtio/virtio-iommu.c
 create mode 100644 include/hw/virtio/virtio-iommu.h
 create mode 100644 include/standard-headers/linux/virtio_iommu.h
 create mode 100644 linux-headers/linux/virtio_iommu.h

-- 
2.5.5