https://nalar.dev/tags/iotlb/ Recent content in IOTLB on Nalar Hugo en-us Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/iommu-iotlb-invalidation-controls-when-dma-remapping-takes-effect/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/iommu-iotlb-invalidation-controls-when-dma-remapping-takes-effect/ <h1 id="iommu-iotlb-invalidation-controls-when-dma-remapping-takes-effect">IOMMU IOTLB Invalidation Controls When DMA Remapping Takes Effect</h1> <p>Changing an IOMMU page-table entry does not necessarily change the translation used by the next DMA request. An IOMMU can cache address translations in an I/O translation lookaside buffer, commonly called an IOTLB. Software must invalidate affected cached state when a mapping is removed or replaced, then observe the invalidation semantics required by that IOMMU before treating the old translation as retired.</p>