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CONFIG_IOMMU_DEFAULT_PASSTHROUGH: Passthrough

General informations

The Linux kernel configuration item CONFIG_IOMMU_DEFAULT_PASSTHROUGH has multiple definitions:

Passthrough found in drivers/iommu/Kconfig

The configuration item CONFIG_IOMMU_DEFAULT_PASSTHROUGH:

Help text

Trusted devices are identity-mapped, giving them unrestricted access to memory with minimal performance overhead. Equivalent to passing "iommu.passthrough=1" (historically "iommu=pt") on the command line.

If this mode is not supported by the IOMMU driver, the effective runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.

IOMMU passthrough by default found in drivers/iommu/Kconfig

The configuration item CONFIG_IOMMU_DEFAULT_PASSTHROUGH:

Help text

Enable passthrough by default, removing the need to pass in iommu.passthrough=on or iommu=pt through command line. If this is enabled, you can still disable with iommu.passthrough=off or iommu=nopt depending on the architecture.

If unsure, say N here.

Hardware

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