iommu/vt-d: Enhance compatibility check for paging domain attach

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The driver now supports domain_alloc_paging, ensuring that a valid device
pointer is provided whenever a paging domain is allocated. Additionally,
the dmar_domain attributes are set up at the time of allocation.

Consistent with the established semantics in the IOMMU core, if a domain is
attached to a device and found to be incompatible with the IOMMU hardware
capabilities, the operation will return an -EINVAL error. This implicitly
advises the caller to allocate a new domain for the device and attempt the
domain attachment again.

Rename prepare_domain_attach_device() to a more meaningful name.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20241021085125.192333-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Lu Baolu 2024-11-04 09:40:23 +08:00 • committed by Joerg Roedel

parent 9ecfcac1fe

commit a98db518dd

4 changed files with 26 additions and 77 deletions

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70

drivers/iommu/intel/iommu.c

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3

drivers/iommu/intel/iommu.h

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2

drivers/iommu/intel/nested.c

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28

drivers/iommu/intel/pasid.c

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