[Xen-devel] [PATCH v2 00/13] paravirtual IOMMU interface

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

The idea of a paravirtual IOMMU interface was last discussed on xen-devel
several years ago and narrowed down on a draft specification [1].
There was also an RFC patch series posted with an implementation, however
this was never followed through.

In this patch series I have tried to simplify the interface and therefore
have moved away from the draft specification. There is not yet any
new specification but hopefully the interface in the introduced iommu_op
header file will be understandable without such a specification.

For testing purposes, I have implemented patches to a Linux PV dom0 to set
up a 1:1 BFN:GFN mapping for normal RAM at start of day and implement
a new set of DMA ops based on direct map and standard swiotlb. 'Foreign'
GFNs (i.e. grant maps) are then mapped and unmapped dynamically. See [2]
for the code.

[1] https://lists.xenproject.org/archives/html/xen-devel/2016-02/msg01428.html
[2] 
http://xenbits.xen.org/gitweb/?p=people/pauldu/linux.git;a=shortlog;h=refs/heads/pv-iommu9

Paul Durrant (13):
  grant_table: use term 'mfn' for machine frame numbers...
  iommu: introduce the concept of BFN...
  iommu: make use of type-safe BFN and MFN in exported functions
  iommu: push use of type-safe BFN and MFN into iommu_ops
  iommu: don't domain_crash() inside iommu_map/unmap_page()
  public / x86: introduce __HYPERCALL_iommu_op
  iommu: track reserved ranges using a rangeset
  x86: add iommu_op to query reserved ranges
  vtd: add lookup_page method to iommu_ops
  x86: add iommu_op to enable modification of IOMMU mappings
  memory: add get_paged_gfn() as a wrapper...
  x86: add iommu_ops to modify and flush IOMMU mappings
  x86: extend the map and unmap iommu_ops to support grant references

 tools/flask/policy/modules/xen.if             |   1 +
 xen/arch/arm/p2m.c                            |   8 +-
 xen/arch/x86/Makefile                         |   1 +
 xen/arch/x86/hvm/emulate.c                    |  32 +-
 xen/arch/x86/hvm/hvm.c                        |  16 +-
 xen/arch/x86/hvm/hypercall.c                  |   1 +
 xen/arch/x86/hypercall.c                      |   1 +
 xen/arch/x86/iommu_op.c                       | 545 ++++++++++++++++++++++++++
 xen/arch/x86/mm.c                             |  14 +-
 xen/arch/x86/mm/p2m-ept.c                     |  18 +-
 xen/arch/x86/mm/p2m-pt.c                      |  52 ++-
 xen/arch/x86/mm/p2m.c                         |  42 +-
 xen/arch/x86/pv/hypercall.c                   |   1 +
 xen/arch/x86/x86_64/mm.c                      |   5 +-
 xen/common/grant_table.c                      | 335 +++++++++++-----
 xen/common/memory.c                           |  52 ++-
 xen/drivers/passthrough/amd/iommu_cmd.c       |  18 +-
 xen/drivers/passthrough/amd/iommu_map.c       |  86 ++--
 xen/drivers/passthrough/amd/pci_amd_iommu.c   |   4 +-
 xen/drivers/passthrough/arm/smmu.c            |  23 +-
 xen/drivers/passthrough/iommu.c               |  66 ++--
 xen/drivers/passthrough/vtd/iommu.c           |  95 +++--
 xen/drivers/passthrough/vtd/iommu.h           |   1 +
 xen/drivers/passthrough/vtd/x86/vtd.c         |  23 +-
 xen/drivers/passthrough/x86/iommu.c           |   7 +-
 xen/include/Makefile                          |   2 +
 xen/include/asm-arm/p2m.h                     |   3 +
 xen/include/asm-x86/hvm/svm/amd-iommu-proto.h |   8 +-
 xen/include/asm-x86/p2m.h                     |   2 +
 xen/include/public/iommu_op.h                 | 171 ++++++++
 xen/include/public/xen.h                      |   1 +
 xen/include/xen/grant_table.h                 |   7 +
 xen/include/xen/hypercall.h                   |  12 +
 xen/include/xen/iommu.h                       |  66 +++-
 xen/include/xen/mm.h                          |  10 +-
 xen/include/xlat.lst                          |   6 +
 xen/include/xsm/dummy.h                       |   6 +
 xen/include/xsm/xsm.h                         |   6 +
 xen/xsm/dummy.c                               |   1 +
 xen/xsm/flask/hooks.c                         |   6 +
 xen/xsm/flask/policy/access_vectors           |   2 +
 41 files changed, 1440 insertions(+), 316 deletions(-)
 create mode 100644 xen/arch/x86/iommu_op.c
 create mode 100644 xen/include/public/iommu_op.h
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
-- 
2.11.0


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