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

[Will Deacon]

On Wed, Sep 09, 2026 at 01:41:07PM -0300, Jason Gunthorpe wrote:
> 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?

All yours!

Will