Tested against the PPA, I see the change in VMX picked up correctly:
root@b-wily:~# virsh domcapabilities | grep vmx; ll
/var/cache/libvirt/qemu/capabilities/
<feature policy='require' name='vmx'/>
total 38
drwxr-xr-x 2 root root 5 Jun 3 10:16 ./
drwxr-x--- 3 libvirt-qemu kvm 3 May 22 12:36 ../
-rw------- 1 root root 56642 Jun 3 10:16
926803a9278e445ec919c2b6cbd8c1c449c75b26dcb1686b774314180376c725.xml
-rw------- 1 root root 56642 Jun 3 10:16
ad11a0ad669fe8eb7496efebe5a20cc8014d83e6553a9bb0294e73973977ad05.xml
-rw------- 1 root root 58463 Jun 3 10:16
f11008721aacc79c97e592178e61264d75be551864cd79cc41fe820e31262f27.xml
root@b-wily:~# virsh domcapabilities | grep vmx; ll
/var/cache/libvirt/qemu/capabilities/
total 30
drwxr-xr-x 2 root root 5 Jun 3 11:44 ./
drwxr-x--- 3 libvirt-qemu kvm 3 May 22 12:36 ../
-rw------- 1 root root 56628 Jun 3 11:44
926803a9278e445ec919c2b6cbd8c1c449c75b26dcb1686b774314180376c725.xml
-rw------- 1 root root 56642 Jun 3 10:16
ad11a0ad669fe8eb7496efebe5a20cc8014d83e6553a9bb0294e73973977ad05.xml
-rw------- 1 root root 58463 Jun 3 10:16
f11008721aacc79c97e592178e61264d75be551864cd79cc41fe820e31262f27.xml
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https://bugs.launchpad.net/bugs/1830268
Title:
Use changed nested VMX attribute as trigger to refresh libvirt
capability cache
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