Vnx-install-modify-qemuconf

If you have just installed libvirt, the parameters to be modified should be commented in the configuration file. So, you just can copy/paste this commands to modify it:

echo 'security_driver = "none"'                                     >> /etc/libvirt/qemu.conf
echo 'user = "root"'                                                >> /etc/libvirt/qemu.conf
echo 'group = "root"'                                               >> /etc/libvirt/qemu.conf
echo 'cgroup_device_acl = ['                                        >> /etc/libvirt/qemu.conf
echo '   "/dev/null", "/dev/full", "/dev/zero",'                    >> /etc/libvirt/qemu.conf
echo '   "/dev/random", "/dev/urandom",'                            >> /etc/libvirt/qemu.conf
echo '   "/dev/ptmx", "/dev/kvm", "/dev/kqemu",'                    >> /etc/libvirt/qemu.conf
echo '   "/dev/rtc", "/dev/hpet", "/dev/vfio/vfio", "/dev/net/tun"' >> /etc/libvirt/qemu.conf
echo ']                                                             >> /etc/libvirt/qemu.conf