RE: [PATCH v5 05/13] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE

From: Nicolin Chen nicolinc@nvidia.com Sent: Saturday, October 26, 2024 7:51 AM

With a vIOMMU object, use space can flush any IOMMU related cache that can be directed via a vIOMMU object. It is similar to the IOMMU_HWPT_INVALIDATE uAPI, but can cover a wider range than IOTLB, e.g. device/desciprtor cache.

Allow hwpt_id of the iommu_hwpt_invalidate structure to carry a viommu_id, and reuse the IOMMU_HWPT_INVALIDATE uAPI for vIOMMU invalidations. Drivers can define different structures for vIOMMU invalidations v.s. HWPT ones.

Update the uAPI, kdoc, and selftest case accordingly.

Reviewed-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com

Reviewed-by: Kevin Tian kevin.tian@intel.com