You  need to reinstall the host after having  enabled the nested feature and obviously reboot the host so as it will boot with the new kernel feature.

Le 26 févr. 2021 19:57, miguel.garcia@toshibagcs.com a écrit :

Hi all,

We are trying to run virtual box in a vm that is running over ovirt platform. I had followed the instruction to enable nested virtualization on host as described in this document https://ostechnix.com/how-to-enable-nested-virtualization-in-kvm-in-linux/

However I was not able to enable nested virtualization to the vm since nothing is listed from virsh console. Also tryed to edit vm configuration lookig up for "cpu mode" or "copy cpu configuration as host"

Also from oVirt admin portal I had enabled host for nested virtualization through Compute > Host > selected Host > edit > Kernel Nested virtualization checked.

But the host still returns:
$ cat /sys/module/kvm_intel/parameters/nested
N
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