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Subject[PATCH RFC v3 00/12] iommu: SVA and IOPF refactoring
Hi folks,

The former part of this series refactors the IOMMU SVA code by assigning
an SVA type of iommu_domain to a shared virtual address and replacing
sva_bind/unbind iommu ops with attach/detach_dev_pasid domain ops.

The latter part changes the existing I/O page fault handling framework
from only serving SVA to a generic one. Any driver or component could
handle the I/O page faults for its domain in its own way by installing
an I/O page fault handler.

This series overlaps with another series posted here [1]. For the
convenience of review, I included all relevant patches in this series.
We will solve the overlap problem later.

This series is also available on github here [2].


Please help review and suggest.

Best regards,

Change log:
- Initial post.

- Add sva domain life cycle management to avoid race between unbind and
page fault handling.
- Use a single domain for each mm.
- Return a single sva handler for the same binding.
- Add a new helper to meet singleton group requirement.
- Rework the SVA domain allocation for arm smmu v3 driver and move the
pasid_bit initialization to device probe.
- Drop the patch "iommu: Handle IO page faults directly".
- Add mmget_not_zero(mm) in SVA page fault handler.

- Rework iommu_group_singleton_lockdown() by adding a flag to the group
that positively indicates the group can never have more than one
member, even after hot plug.
- Abstract the data structs used for iommu sva in a separated patches to
make it easier for review.
- I still keep the RFC prefix in this series as above two significant
changes need at least another round review to be finalized.
- Several misc refinements.

Lu Baolu (12):
iommu: Add pasid_bits field in struct dev_iommu
iommu: Add a flag to indicate immutable singleton group
iommu: Add attach/detach_dev_pasid domain ops
iommu/sva: Basic data structures for SVA
iommu/vt-d: Remove SVM_FLAG_SUPERVISOR_MODE support
iommu/vt-d: Add SVA domain support
arm-smmu-v3/sva: Add SVA domain support
iommu/sva: Use attach/detach_pasid_dev in SVA interfaces
iommu: Remove SVA related callbacks from iommu ops
iommu: Prepare IOMMU domain for IOPF
iommu: Per-domain I/O page fault handling
iommu: Rename iommu-sva-lib.{c,h}

include/linux/intel-iommu.h | 5 +-
include/linux/iommu.h | 107 ++++--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 25 +-
.../iommu/{iommu-sva-lib.h => iommu-sva.h} | 8 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 85 ++---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 28 +-
drivers/iommu/intel/iommu.c | 20 +-
drivers/iommu/intel/svm.c | 135 +++----
drivers/iommu/io-pgfault.c | 71 +---
drivers/iommu/iommu-sva-lib.c | 71 ----
drivers/iommu/iommu-sva.c | 331 ++++++++++++++++++
drivers/iommu/iommu.c | 239 +++++++------
drivers/iommu/Makefile | 2 +-
13 files changed, 706 insertions(+), 421 deletions(-)
rename drivers/iommu/{iommu-sva-lib.h => iommu-sva.h} (88%)
delete mode 100644 drivers/iommu/iommu-sva-lib.c
create mode 100644 drivers/iommu/iommu-sva.c


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