Re: [PATCH v2 09/19] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT_INVALIDATE

Jason Gunthorpe
2024-09-05T16:11:56Z

On Tue, Aug 27, 2024 at 09:59:46AM -0700, Nicolin Chen wrote:
> With a VIOMMU object, use space can flush any IOMMU related cache that can
> be directed using the viommu. It is similar to IOMMU_HWPT_INVALIDATE uAPI,
> but can cover a wider range than IOTLB, such as device cache or 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. Driver
> can define a different structure for VIOMMU invalidations v.s. HWPT ones.
>
> Update the uAPI, kdoc, and selftest case accordingly.
>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> ---
> drivers/iommu/iommufd/hw_pagetable.c | 32 +++++++++++++++++++------
> include/uapi/linux/iommufd.h | 9 ++++---
> tools/testing/selftests/iommu/iommufd.c | 4 ++--
> 3 files changed, 33 insertions(+), 12 deletions(-)

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

Jason