Explore the complexities of implementing virtual CPU hotplug functionality on System-on-Chip (SoC) based systems, with a focus on ARM64 architecture, in this 25-minute conference talk presented by Salil Mehta from Huawei at a Linux Foundation event. Gain insights into the necessity of virtual CPU hotplug, delve into the challenges faced during implementation, and understand the limitations imposed by various components. Learn about known issues, including unwiring of interrupt setups, and discover workarounds developed for KVM. Examine recent attempts to address these challenges, analyze problems encountered in upstream development, and get a glimpse of future work in this critical area of virtualization technology.