# cat /sys/module/kvm_intel/parameters/nested
Make sure KVM is intalled on the machine, if output is N, then Nested Virtualization is disabled, to enable the feature, set options kvm-intel nested=1 in /etc/modprobe.d/kvm-nested.conf
# echo "options kvm-intel nested=1" > /etc/modprobe.d/kvm-nested.conf
Reboot the machine, and verify like above command.
On the xml configuration, ensure cpu mode is host-passthrough
To use nested virtualization, the host CPU must have the necessary feature flags:
For Intel - vmx (Hardware Virtualization) and ept (Extended Page Tables)
For AMD - svm (equivalent to vmx) and npt (equivalent to ept)
Check that flag on /proc/cpuinfo
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