RE: [PATCH v8 02/10] iommufd: Add IOMMU_HWPT_INVALIDATE

Tian, Kevin
2023-12-28T06:07:17Z

> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Thursday, December 28, 2023 12:14 AM
>
> In nested translation, the stage-1 page table is user-managed but cached
> by the IOMMU hardware, so an update on present page table entries in the
> stage-1 page table should be followed with a cache invalidation.
>
> Add an IOMMU_HWPT_INVALIDATE ioctl to support such a cache
> invalidation.
> It takes hwpt_id to specify the iommu_domain, and a multi-entry array to
> support multiple invalidation data in one ioctl.
>
> enum iommu_hwpt_invalidate_data_type is defined to tag the data type of
> the entries in the multi-entry array.
>
> Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>

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