Supporting Live Update in VFIO
summary
Work to let VFIO PCI devices keep running across kexec centers on concrete steps: a live-update orchestrator already accepts a vfio cdev fd preservation request so userspace can hand LUO a VFIO FD and get it back after kexec, next preserves IOMMUFD and DMA mappings as IOMMUFD DMA mapping preservation, then preserve core PCI state (BAR addresses, bus numbers, bus-master bits) and eventually device config and SR‑IOV PFs. Interrupts must be disabled by the VMM before kexec (reboot syscall fails otherwise) or filtered at the interrupt/MMU level, and PCI scanning must avoid destructive reprobing by inheriting bus numbers or replaying a PCI snapshot.
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