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The Linux kernel configuration item CONFIG_VFIO_NOIOMMU:

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VFIO is built on the ability to isolate devices using the IOMMU. Only with an IOMMU can userspace access to DMA capable devices be considered secure. VFIO No-IOMMU mode enables IOMMU groups for devices without IOMMU backing for the purpose of re-using the VFIO infrastructure in a non-secure mode. Use of this mode will result in an unsupportable kernel and will therefore taint the kernel. Device assignment to virtual machines is also not possible with this mode since there is no IOMMU to provide DMA translation.

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