[PATCH v3 07/16] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE

[Jason Gunthorpe]

On Wed, Oct 09, 2024 at 09:38:19AM -0700, Nicolin Chen wrote:
> With a vIOMMU object, use space can flush any IOMMU related cache that can
> be directed using the vIOMMU object. It is similar to 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 at nvidia.com>
> Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
> ---
>  include/uapi/linux/iommufd.h            |  9 ++++---
>  drivers/iommu/iommufd/hw_pagetable.c    | 32 +++++++++++++++++++------
>  tools/testing/selftests/iommu/iommufd.c |  4 ++--
>  3 files changed, 33 insertions(+), 12 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason