RE: [PATCH v4 10/17] iommufd: IOCTLs for the io_pagetable

Tian, Kevin
2022-11-14T07:46:49Z

> From: Jason Gunthorpe <jgg@nvidia.com>
> Sent: Tuesday, November 8, 2022 8:49 AM
>
> Connect the IOAS to its IOCTL interface. This exposes most of the
> functionality in the io_pagetable to userspace.
>
> This is intended to be the core of the generic interface that IOMMUFD will
> provide. Every IOMMU driver should be able to implement an
> iommu_domain
> that is compatible with this generic mechanism.
>
> It is also designed to be easy to use for simple non virtual machine
> monitor users, like DPDK:
> - Universal simple support for all IOMMUs (no PPC special path)
> - An IOVA allocator that considers the aperture and the allowed/reserved
> ranges
> - io_pagetable allows any number of iommu_domains to be connected to
> the
> IOAS
> - Automatic allocation and re-use of iommu_domains
>
> Along with room in the design to add non-generic features to cater to
> specific HW functionality.
>
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>

with kernel-doc warning fixed:

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