Apparently the only rules that need to be added to /etc/apparmor.d/usr.bin.nova-compute for it to work are
/usr/share/osinfo/{,**} r, /usr/share/misc/pci.ids r, /var/lib/usbutils/usb.ids r,
(add them below " /usr/share/qemu/firmware/{,**} r,")
Apparently the only rules that need to be added to /etc/apparmor. d/usr.bin. nova-compute for it to work are
/usr/ share/osinfo/ {,**} r, share/misc/ pci.ids r, lib/usbutils/ usb.ids r,
/usr/
/var/
(add them below " /usr/share/ qemu/firmware/ {,**} r,")