Challenges Revisited in Supporting Virtual CPU Hotplug on Non-Supporting Architectures

Explore the challenges and progress in supporting Virtual CPU Hotplug on architectures lacking physical CPU Hotplug capabilities in this 33-minute KVM Forum talk. Delve into the history of CPU Hotplug, its use cases, and the demand from cloud vendors for alternatives to x86 systems. Examine the previously perceived challenges and rejected solutions, followed by an update on advancements made in guest kernels, QEMU virtualizers, host KVM, and firmware/ACPI. Gain insights into the remaining obstacles, recent upstream attempts, and participate in a Q&A session. This presentation serves as a follow-up to the KVMForum2020 talk, offering a comprehensive look at the evolving landscape of Virtual CPU Hotplug support across different architectures.

Challenges Revisited in Supporting Virt CPU Hotplug on architectures that don't Support CPU Hotplug