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[v2,0/4] iommu/smmuv3: Add IOMMUFD dirty tracking support for SMMUv3

Message ID 20240222094923.33104-1-shameerali.kolothum.thodi@huawei.com (mailing list archive)
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Series iommu/smmuv3: Add IOMMUFD dirty tracking support for SMMUv3 | expand

Message

Shameerali Kolothum Thodi Feb. 22, 2024, 9:49 a.m. UTC 
Hi,

This is revisiting the earlier attempts [1, 2] to use SMMUv3 HTTU feature
for dirty page tracking. The Intel/AMD support is already mainline.

The code is now based on the new IOMMUFD APIs and is rebased on
Jason's SMMUv3 driver refactor series[3].

Basic sanity tests are done using an emulation setup and on a test
hardware setup. Block page split/merge(BBML) is not part of this
series. I am planning to send it separately.

v1 --> v2:
https://lore.kernel.org/linux-iommu/20231128094940.1344-1-shameerali.kolothum.thodi@huawei.com/

Addressed review comments from Jason and Joao(Thanks)
   -Moved dirty_ops setting to domain finalise(patch #3)
   -Only enable DBM for stage 1 if domain_alloc_user() requests it.
   -Changed IO page table walker(patch #2) and tested with 4KB/16KB/64KB
    with l1/l2/l3 traversal.(The earlier one had a bug where it fails to
    walk L3 level).
   -Rearranged patches a bit to improve bi-sectability.
   -Rebased on top of Jason's v5 of SMMUv3 new API series git.

Please take a look and let me know your feedback.
Thanks,
Shameer

1. https://lore.kernel.org/lkml/20210413085457.25400-1-zhukeqian1@huawei.com/
2. https://lore.kernel.org/linux-iommu/20230518204650.14541-1-joao.m.martins@oracle.com/
3. https://github.com/jgunthorpe/linux/commits/smmuv3_newapi

Jean-Philippe Brucker (1):
  iommu/arm-smmu-v3: Add feature detection for HTTU

Joao Martins (1):
  iommu/arm-smmu-v3: Add support for dirty tracking in domain alloc

Kunkun Jiang (1):
  iommu/arm-smmu-v3: Enable HTTU for stage1 with io-pgtable mapping

Shameer Kolothum (1):
  iommu/io-pgtable-arm: Add read_and_clear_dirty() support

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 142 +++++++++++++++++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |   8 ++
 drivers/iommu/io-pgtable-arm.c              | 133 +++++++++++++++++-
 include/linux/io-pgtable.h                  |   4 +
 4 files changed, 263 insertions(+), 24 deletions(-)