RE: [PATCH v3 11/15] iommufd: Add a HW pagetable object

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> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Wednesday, October 26, 2022 2:12 AM
> 
> The hw_pagetable object exposes the internal struct iommu_domain's to
> userspace. An iommu_domain is required when any DMA device attaches to
> an
> IOAS to control the io page table through the iommu driver.
> 
> For compatibility with VFIO the hw_pagetable is automatically created when
> a DMA device is attached to the IOAS. If a compatible iommu_domain
> already
> exists then the hw_pagetable associated with it is used for the
> attachment.
> 
> In the initial series there is no iommufd uAPI for the hw_pagetable
> object. The next patch provides driver facing APIs for IO page table
> attachment that allows drivers to accept either an IOAS or a hw_pagetable
> ID and for the driver to return the hw_pagetable ID that was auto-selected
> from an IOAS. The expectation is the driver will provide uAPI through its
> own FD for attaching its device to iommufd. This allows userspace to learn
> the mapping of devices to iommu_domains and to override the automatic
> attachment.
> 
> The future HW specific interface will allow userspace to create
> hw_pagetable objects using iommu_domains with IOMMU driver specific
> parameters. This infrastructure will allow linking those domains to IOAS's
> and devices.
> 
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

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




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