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PassthroughConfigname: CONFIG_IOMMU_DEFAULT_PASSTHROUGH default domain type
L->Passthrough
In linux kernel since version 3.10 (release Date:2013-06-30)
Trusted devices are identity-mapped, giving them unrestricted accessto 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 lOMMU driver, the effectiveruntime default will fall back tO IOMMU DEFAULT DMA STRICT

./drivers/iommu/Kconfig:140:	  "iommu.passthrough=1" (historically "iommu=pt") on the command line.

iommu=ptiommu.passthrough=1是一样的。

linux对iommu=pt内核命令行参数解析的流程

arch/x86/kernel/pci-dma.c:189:ear

本文标签: 内核 参数 iommu PT