Comment 3 for bug 1445386

on the host:

➜ tmp>echo foo > share1/bar
➜ tmp>echo foo > share2/bar
➜ tmp>ls -la share*
share1:
total 4
drwxrwxr-x 1 muelli muelli 6 Apr 24 11:22 ./
drwxrwxr-x 1 muelli muelli 30 Apr 24 11:17 ../
-rw-rw-r-- 1 muelli muelli 4 Apr 24 11:28 bar

share2:
total 4
drwxrwxr-x 1 muelli muelli 6 Apr 24 11:22 ./
drwxrwxr-x 1 muelli muelli 30 Apr 24 11:17 ../
-rw-rw-r-- 1 muelli muelli 4 Apr 24 11:28 bar
➜ tmp>pwd
/home/muelli/tmp
➜ tmp>

and then on the guest:

root@ubuntu:~# mkdir /tmp/mnt1
root@ubuntu:~# mkdir /tmp/mnt2
root@ubuntu:~# mount /hostshare1 -t 9p -o trans=virtio,version9p2000.L,access=any,posixacl /tmp/mnt1/
root@ubuntu:~# mount /hostshare2 -t 9p -o trans=virtio,version9p2000.L,access=any,posixacl /tmp/mnt2/
root@ubuntu:~# ls -la /tmp/mnt*/
/tmp/mnt1/:
total 8
drwxrwxr-x 1 foo foo 6 Apr 24 11:22 .
drwxrwxrwt 4 root root 4096 Apr 24 11:27 ..
-rw-rw-r-- 1 foo foo 4 Apr 24 11:28 bar

/tmp/mnt2/:
total 8
drwxrwxr-x 1 foo foo 6 Apr 24 11:22 .
drwxrwxrwt 4 root root 4096 Apr 24 11:27 ..
-rw-rw-r-- 1 foo foo 4 Apr 24 11:28 bar
root@ubuntu:~# cat /tmp/mnt*/bar
foo
foo
root@ubuntu:~# echo baz > /tmp/mnt1/baz
-bash: /tmp/mnt1/baz: Permission denied
root@ubuntu:~# echo baz > /tmp/mnt2/baz
-bash: /tmp/mnt2/baz: Permission denied

so reading seems to work, but writing not. I can imagine that to be a problem with the permissions of the folder being written to. However, changing the group of the folders to libvirtd didn't help.