Using CPU & Memory Hotplug for VM Vertical Scaling

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" summary

KubeVirt uses CPU and memory hotplug for vertical scaling on x86 Linux guests: changing vCPU from 2 to 4 triggers live migration to a target pod where libvirt hotplug adds CPUs, and increasing guest memory from 1Gi to 2Gi updates requested and current after online resize. Memory cannot be reduced below the boot size. API uses a cluster-level VM roll strategy (live vs staged); future work targets in‑place pod updates to avoid live migration and VMI subresources for scaling and metrics.

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" chapters (5)

1. 0:00Introduction
2. 1:06CPU & memory hotplug
3. 3:59API design challenges
4. 7:10Future plans for hotplug
5. 10:30Q&A

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