iommu/amd: Refactor persistent DTE bits programming into amd_iommu_make_clear_dte()

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To help avoid duplicate logic when programing DTE for nested translation.

Note that this commit changes behavior of when the IOMMU driver is
switching domain during attach and the blocking domain, where DTE bit
fields for interrupt pass-through (i.e. Lint0, Lint1, NMI, INIT, ExtInt)
and System management message could be affected. These DTE bits are
specified in the IVRS table for specific devices, and should be persistent.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Suravee Suthikulpanit 2026-01-15 06:08:12 +00:00 • committed by Joerg Roedel

parent 757d2b1fdf

commit 4e1b09d90b

2 changed files with 13 additions and 11 deletions

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13

drivers/iommu/amd/amd_iommu.h

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11

drivers/iommu/amd/iommu.c

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