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General informations

The Linux kernel configuration item CONFIG_IOMMU_DEFAULT_DMA_STRICT:

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Trusted devices use translation to restrict their access to only DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent to passing "iommu.passthrough=0 iommu.strict=1" on the command line.

Untrusted devices always use this mode, with an additional layer of bounce-buffering such that they cannot gain access to any unrelated data within a mapped page.



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