[Xen-devel] [RFC for-4.5 00/12] IOMMU support for ARM

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hello,

This patch series add support for IOMMU on ARM. It have also added ARM SMMU
driver which is used for instance on Midway.

The IOMMU architecture for ARM is relying on the page table is shared between
the processor and each IOMMU.

The patch series is divided following:
    - #1: fixing grant-table with IOMMU. Will be necessary for ARM later
    - #2-#3: Make static some vtd functions
    - #4-#5: Adding new device tree functions
    - #6-#9: Prepare IOMMU code to add support for ARM
    - #10-#11: Add IOMMU architecture for ARM
    - #12: Add SMMU drivers

For now the 1:1 workaround is not removed because a same platform can have
DMA-capable device which are under an IOMMU and some not. It's a problem for
the swiotlb which needs to know if the device is procted or not when foreign
mapping is mapped in dom0.

When I talked with Stefano, 2 solutions came:
    - Having a property in each "protected" device
    - List in the hypervisor node the procted devices

I didn't yet decide which solution I will use.

Any comments, questions are welcomed.

Sincerely yours,

Julien Grall (12):
  xen/common: grant-table: only call IOMMU if paging mode translate is
    disabled
  xen/passthrough: vtd: Don't export iommu_domain_teardown
  xen/passthrough: vtd: Don't export iommu_set_pgd
  xen/dts: Add dt_property_read_bool
  xen/dts: Add dt_parse_phandle_with_args and dt_parse_phandle
  xen/passthrough: rework dom0_pvh_reqs to use it also on ARM
  xen/passthrough: iommu: Don't need to map dom0 page when the PT is
    shared
  xen/passthrough: iommu: Split generic IOMMU code
  xen/passthrough: iommu: Introduce arch specific code
  xen/passthrough: Introduce IOMMU ARM architure
  MAINTAINERS: Add drivers/passthrough/arm
  drivers/passthrough: arm: Add support for SMMU drivers

 MAINTAINERS                                 |    1 +
 xen/arch/arm/Rules.mk                       |    1 +
 xen/arch/arm/domain.c                       |    7 +
 xen/arch/arm/domain_build.c                 |    2 +
 xen/arch/arm/p2m.c                          |    4 +
 xen/arch/arm/setup.c                        |    2 +
 xen/arch/x86/domctl.c                       |    6 +-
 xen/arch/x86/hvm/io.c                       |    2 +-
 xen/arch/x86/tboot.c                        |    3 +-
 xen/common/device_tree.c                    |  157 ++-
 xen/common/grant_table.c                    |    7 +-
 xen/drivers/passthrough/Makefile            |    7 +-
 xen/drivers/passthrough/amd/iommu_cmd.c     |    2 +-
 xen/drivers/passthrough/amd/iommu_guest.c   |    8 +-
 xen/drivers/passthrough/amd/iommu_map.c     |   56 +-
 xen/drivers/passthrough/amd/pci_amd_iommu.c |   53 +-
 xen/drivers/passthrough/arm/Makefile        |    2 +
 xen/drivers/passthrough/arm/iommu.c         |   65 +
 xen/drivers/passthrough/arm/smmu.c          | 1701 +++++++++++++++++++++++++++
 xen/drivers/passthrough/iommu.c             |  525 +--------
 xen/drivers/passthrough/iommu_pci.c         |  468 ++++++++
 xen/drivers/passthrough/iommu_x86.c         |  106 ++
 xen/drivers/passthrough/vtd/iommu.c         |  124 +-
 xen/include/asm-arm/device.h                |    3 +-
 xen/include/asm-arm/domain.h                |    2 +
 xen/include/asm-arm/hvm/iommu.h             |   10 +
 xen/include/asm-arm/iommu.h                 |   36 +
 xen/include/asm-x86/hvm/iommu.h             |   29 +
 xen/include/asm-x86/iommu.h                 |   50 +
 xen/include/xen/device_tree.h               |   75 ++
 xen/include/xen/hvm/iommu.h                 |   27 +-
 xen/include/xen/iommu.h                     |   51 +-
 32 files changed, 2891 insertions(+), 701 deletions(-)
 create mode 100644 xen/drivers/passthrough/arm/Makefile
 create mode 100644 xen/drivers/passthrough/arm/iommu.c
 create mode 100644 xen/drivers/passthrough/arm/smmu.c
 create mode 100644 xen/drivers/passthrough/iommu_pci.c
 create mode 100644 xen/drivers/passthrough/iommu_x86.c
 create mode 100644 xen/include/asm-arm/hvm/iommu.h
 create mode 100644 xen/include/asm-arm/iommu.h
 create mode 100644 xen/include/asm-x86/iommu.h

-- 
1.7.10.4


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