I ran into this issue as well so make a blog post about my efforts https://www.thegoldfish.org/2017/04/nested-virtualization-in-centos-6/ Summary is I needed to add a pass through command in libvirt to get qemu to start with the enable-nesting option https://libvirt.org/drvqemu.html#qemucommand -- View this message in context: http://centos.1050465.n5.nabble.com/CentOS-How-to-enable-the-svm-cpu-flag-inside-a-vm-tp5745040p5747856.html Sent from the CentOS mailing list archive at Nabble.com.