Kernel-based Virtual Machine (KVM) provides a possibility to use the Oracle (or Redhat/CentOS) Linux kernel as a hypervisor.
In my example, I will configure the KVM virtualization on top of the guest vm running OEL 7.4. The guest VM is running on top of the VMWare Workstation 12.
To enable the virtualization layer select VM settings and navigate to the Processor settings. Enable the setting „Virtualize Intel VT-x/EPT or AMD-V/RVI.“
The Guest VM is now enabled for the using of the nested virtualization (such kvm). Start the Guest VM.