• Symptom and Cause:
    If you use an old server as your compute node, you may fail to create a VM instance or cannot log in to the console of the VM instance due to the earlier CPU model. The following figure shows this symptom and cause.



  • Solution:
    If this situation reproduces, try the following:
    1. Add ept=0 to the first line in kvm-nested.conf. For example,
      options kvm_intel nested=1 ept=0
#vim /etc/modprobe.d/kvm-nested.conf
    2. Stop the VM instance that is in the running state, and remove kvm_intel:
      #rmmod kvm_intel
    3. Reattach kvm_intel:
      #modprobe kvm-intel ept=0 unrestricted_guest=0