iommufd: Fault-capable hwpt attach/detach/replace

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Add iopf-capable hw page table attach/detach/replace helpers. The pointer
to iommufd_device is stored in the domain attachment handle, so that it
can be echo'ed back in the iopf_group.

The iopf-capable hw page tables can only be attached to devices that
support the IOMMU_DEV_FEAT_IOPF feature. On the first attachment of an
iopf-capable hw_pagetable to the device, the IOPF feature is enabled on
the device. Similarly, after the last iopf-capable hwpt is detached from
the device, the IOPF feature is disabled on the device.

The current implementation allows a replacement between iopf-capable and
non-iopf-capable hw page tables. This matches the nested translation use
case, where a parent domain is attached by default and can then be
replaced with a nested user domain with iopf support.

Link: https://lore.kernel.org/r/20240702063444.105814-8-baolu.lu@linux.intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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This commit is contained in:

Lu Baolu 2024-07-02 14:34:41 +08:00 • committed by Jason Gunthorpe

parent 07838f7fd5

commit b7d8833677

3 changed files with 235 additions and 3 deletions

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7

drivers/iommu/iommufd/device.c

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190

drivers/iommu/iommufd/fault.c

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41

drivers/iommu/iommufd/iommufd_private.h

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