iommu: Add config option to set passthrough as default

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This allows the default behavior to be controlled by a kernel config
option instead of changing the commandline for the kernel to include
"iommu.passthrough=on" or "iommu=pt" on machines where this is desired.

Likewise, for machines where this config option is enabled, it can be
disabled at boot time with "iommu.passthrough=off" or "iommu=nopt".

Also corrected iommu=pt documentation for IA-64, since it has no code that
parses iommu= at all.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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This commit is contained in:

Olof Johansson 2018-07-20 11:02:23 -07:00 • committed by Joerg Roedel

parent c52c72d3de

commit 58d1131777

4 changed files with 25 additions and 1 deletions

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3

Documentation/admin-guide/kernel-parameters.txt

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8

arch/x86/kernel/pci-dma.c

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11

drivers/iommu/Kconfig

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4

drivers/iommu/iommu.c

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