iommufd/selftest: Convert cache invalidation mocks to the core array loop

The vIOMMU and the nested-domain selftest invalidation mocks each used to
walk the whole request array on their own, with the vIOMMU mock even
allocating a buffer sized to the entire array in order to do so first.

The iommufd core now iterates the request array itself and re-invokes the
op with the not-yet-handled sub-array, so handle just a single request per
call out of the front of that sub-array and report one handled entry via
the array->entry_num. Drop both of the loops and the kzalloc_objs() in the
viommu callback function, and keep returning a success for an empty array
as a probe of the selftest data type.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://patch.msgid.link/535f3b97e16c437f1df0c988a96229f623142ee9.1788127877.git.nicolinc@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

0 files changed, 0 insertions, 0 deletions