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iommu/amd: Add amd_iommu=force_enable option

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Add this option to enable the IOMMU on platforms like AMD Stoney,
where the kernel usually disables it because it may cause problems in
some scenarios.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20210603130203.29016-1-joro@8bytes.org
This commit is contained in:
Joerg Roedel
2021-06-03 15:02:03 +02:00
parent 4b21a503ad
commit b1e650db2c
2 changed files with 11 additions and 1 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -301,6 +301,9 @@
allowed anymore to lift isolation
requirements as needed. This option
does not override iommu=pt
force_enable - Force enable the IOMMU on platforms known
to be buggy with IOMMU enabled. Use this
option with care.
amd_iommu_dump= [HW,X86-64]
Enable AMD IOMMU driver option to dump the ACPI table