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General informations

The Linux kernel configuration item CONFIG_IOMMU_DEFAULT_DMA_LAZY:

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Trusted devices use translation to restrict their access to only DMA-mapped pages, but with "lazy" batched TLB invalidation. This mode allows higher performance with some IOMMUs due to reduced TLB flushing, but at the cost of reduced isolation since devices may be able to access memory for some time after it has been unmapped. Equivalent to passing "iommu.passthrough=0 iommu.strict=0" 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.



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