a bird told me IOMMU is insufficient protection even *if* used properly…
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Sufficient or not, it's necessary. Especially if you allow gpu programming or similar.
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"Mastering the DMA and IOMMU APIs" covers some of the problems they're using IOMMU for in mainline. Not security https://events.linuxfoundation.org/sites/events/files/slides/20140429-dma.pdf …
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IOMMU support in Linux is not so great, lots of bugs -- security advantages questionable at best given driver implmentation quality
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IIrc we at voidlinux had problems with Intel's iommu on certain chipsets.
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