Re: [PATCH v6 0/5] iommufd: Iterate the cache invalidation array in the core

[Jason Gunthorpe]

On Sun, Aug 30, 2026 at 03:26:37PM -0700, Nicolin Chen wrote:
> The vIOMMU cache_invalidate() and the nested-HWPT cache_invalidate_user()
> ops are each handed the full user invalidation array and must report, via
> array->entry_num, how many of its entries they handled. That makes every
> driver open-code the same array walk, with real downsides:
[..]
> Nicolin Chen (5):
>   iommu/arm-smmu-v3-iommufd: Reject unsupported bits in invalidation
>     commands
>   iommufd: Iterate the cache invalidation array in the core
>   iommufd/selftest: Convert cache invalidation mocks to the core array
>     loop
>   iommu/arm-smmu-v3-iommufd: Convert cache invalidation to the core
>     array loop
>   iommu/vt-d: Convert nested cache invalidation to the core array loop
> 
>  include/linux/iommu.h                         |   6 +-
>  include/linux/iommufd.h                       |   2 +
>  include/uapi/linux/iommufd.h                  |   4 +-
>  .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c     | 197 ++++++++++++++----
>  drivers/iommu/intel/nested.c                  |  54 ++---
>  drivers/iommu/iommufd/hw_pagetable.c          |  25 ++-
>  drivers/iommu/iommufd/selftest.c              | 147 +++++++------
>  7 files changed, 282 insertions(+), 153 deletions(-)

Will, can I pick this up, or did you want a branch or something?

Thanks,
Jason