PPaPaarraraallllelelelll vCPU onlining for arm64
CONFIG_HOTPLUG_PARALLEL was introduced to the kernel to enable parallel booting of CPUs, primarily to accelerate the application of microcode updates on x86. However, much of the logic driving the onlining is implemented in core code and so this talk will cover the grotty details of enabling it for arm64 and reveal whether or not it can accelerate the onlining of vCPUs under KVM.