qemu/virt-manager no permisson on shared folder

I have a strange problem. Iam trying to create a shared folder via the add-hardware->filesystem option. For Type and Modus i choose Passtrought and for Driver Path. The Source Path is /free and target is mytag. I mount it with: mount -t 9p -o trans=virtio mytag /mnt/test -oversion=9p2000.L Everything worked without problems. But when i enter /mnt/test and do a ls, i get "ls: Öffnen von Verzeichnis . nicht möglich: Keine Berechtigung" in english something like "ls: cant open folder . no permission"

I set permissions of /free to 777 recursivly but nothing changed. Also tried some other modes in virt-manager but nothing changes. Do you have any clues, what i am doing wrong?

The guest-os ist Ubuntu 12.04 and the host-os is Ubuntu 11.10

Thank you for your help.

You asked for any hints, so here we go.

1. First, -orw in the mount options can help,
2. furthermore the user and group ids should match on both systems (they likely do if you use general users like ftp, www-data etc.)
3. check under which user the vm is started (e.g. kvm or libvirt-qemu - see /etc/libvirt/qemu.conf).
4. apparmor can create closed doors, too, there is various stackoverflow questions and posts on this.