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Learn how to preserve IOMMU state during kernel live updates to maintain device continuity for virtual machines in this 15-minute conference talk from the Linux Plumbers Conference. Explore the critical challenge of maintaining DMA operations when devices owned by virtual machines continue operating during kernel updates, where traditional kexec reboots would reinitialize the IOMMU and cause loss of all state and pre-existing DMA mappings. Discover the technical approach to preserving IOMMUFDs and IOMMU domains, understand what specific state information must be saved and the mechanisms behind the preservation process, examine how the preserved state gets restored in the new kernel environment, and review verification methods to ensure successful state preservation and device operation continuity across kernel updates.
