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

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>