# Case: If enable in VMware on VM Hot Add CPU / Memory need to make udev conf
nano /etc/udev/rules.d/94-hotplug-cpu-mem.rules 

ACTION=="add", SUBSYSTEM=="cpu", ATTR{online}=="0", ATTR{online}="1"
ACTION=="add", SUBSYSTEM=="memory", ATTR{state}=="offline", ATTR{state}="online"

# Reboot VM and all is ready for use