KVM and 9p permission issues

Been using Virtualbox to run Nextcloud for a long time and trying to transition to KVM.  The problem I am having is with the data directory which I have outside the VM and located on the cache drive set as cache-only.  In Virtualbox I map that cache-only directory to 'clouddata' which Nextcloud uses just fine after setting user/group to www-data on initial setup.  On the transition to KVM everything works except I am having issues with maintaining user/group and permissions to the data folder map using 9p.  I mount the share in fstab and rebooted, and set the user/group to www-data.  Nextcloud on first read says nothing wrong.  Log out then back in and it complains it either cannot read the data folder or the permissions are not set right.  'ls -la' the data share and everything looks correct.  I really do not want to use cifs to map to the share and I do not want to transition to Docker for this and require three Dockers to do what a single VM can do.  I have a feeling QEMU alters permissions since it runs as nobody, perhaps?  Any ideas or is this a quirk with 9p/QEMU and using user/group other than nobody?  Thanks