Comment 15 for bug 1830268

I wanted to wait until the Bionic upload would show up as well.
But it didn't and I don't want to stall this more than needed.
So verifying cosmic:

root@c:~# virsh domcapabilities | grep vmx; ll /var/cache/libvirt/qemu/capabilities/
      <feature policy='require' name='vmx'/>
total 27
drwxr-xr-x 2 root root 5 Jun 13 10:31 ./
drwxr-x--- 3 libvirt-qemu kvm 3 Jun 13 10:30 ../
-rw------- 1 root root 35567 Jun 13 10:30 926803a9278e445ec919c2b6cbd8c1c449c75b26dcb1686b774314180376c725.xml
-rw------- 1 root root 56905 Jun 13 10:31 ad11a0ad669fe8eb7496efebe5a20cc8014d83e6553a9bb0294e73973977ad05.xml
-rw------- 1 root root 37388 Jun 13 10:30 f11008721aacc79c97e592178e61264d75be551864cd79cc41fe820e31262f27.xml
root@c:~# cat /proc/cpuinfo ^C
root@c:~# cat /sys/module/kvm_intel/parameters/nested
cat: /sys/module/kvm_intel/parameters/nested: No such file or directory
root@c:~# cat /sys/module/kvm_intel/parameters/nested; virsh domcapabilities | grep vmx; ll /var/cache/libvirt/qemu/capabilities/
N
total 27
drwxr-xr-x 2 root root 5 Jun 13 10:32 ./
drwxr-x--- 3 libvirt-qemu kvm 3 Jun 13 10:30 ../
-rw------- 1 root root 35567 Jun 13 10:30 926803a9278e445ec919c2b6cbd8c1c449c75b26dcb1686b774314180376c725.xml
-rw------- 1 root root 56891 Jun 13 10:32 ad11a0ad669fe8eb7496efebe5a20cc8014d83e6553a9bb0294e73973977ad05.xml
-rw------- 1 root root 37388 Jun 13 10:30 f11008721aacc79c97e592178e61264d75be551864cd79cc41fe820e31262f27.xml
root@c:~# cat /sys/module/kvm_intel/parameters/nested; virsh domcapabilities | grep vmx; ll /var/cache/libvirt/qemu/capabilities/
Y
      <feature policy='require' name='vmx'/>
total 27
drwxr-xr-x 2 root root 5 Jun 13 10:32 ./
drwxr-x--- 3 libvirt-qemu kvm 3 Jun 13 10:30 ../
-rw------- 1 root root 35567 Jun 13 10:30 926803a9278e445ec919c2b6cbd8c1c449c75b26dcb1686b774314180376c725.xml
-rw------- 1 root root 56905 Jun 13 10:32 ad11a0ad669fe8eb7496efebe5a20cc8014d83e6553a9bb0294e73973977ad05.xml
-rw------- 1 root root 37388 Jun 13 10:30 f11008721aacc79c97e592178e61264d75be551864cd79cc41fe820e31262f27.xml

The file refreshes on change of the nested attribute.