Host: CentOS-7_v1611 (or Fedora 25 -my personal fav) VMs: oVirt nodes v4.1.2 To setup nested KVM, I follow these instructions(https://pve.proxmox.com/wiki/Nested_Virtualization) to check if is enabled do ("kvm_intel" for intel cpu, "kvm_amd" for AMD) -root@proxmox:~# cat /sys/module/kvm_intel/parameters/nested N (N means it's not, to enable ("kvm-intel" for intel, "kvm-amd" for AMD):) # echo "options kvm-intel nested=Y" > /etc/modprobe.d/kvm-intel.conf and reboot or reload the kernel modul modprobe -r kvm_intel modprobe kvm_intel check again -root@proxmox:~# cat /sys/module/kvm_intel/parameters/nested Y Question: what other settings need to be enabled in the guest vm? See "test nested virt" at https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM Do we need this setting in the vm?