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virtfs: mapped-xattr on mount point
With
-virtfs local,path="/tmp",security_model=mapped-xattr,mount_tag="shared2"
in the qemu command line,
shared2 on /mnt/testbis type 9p (rw,sync,dirsync,relatime,trans=virtio,version=9p2000.L,msize=262144)
in the guest mount points, and
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
in the host mount points (with CONFIG_TMPFS_XATTR=y according to zgrep /proc/config.gz), running qemu as user "vm-test", trying to "touch a" in /mnt/testbis on the VM fails with "Operation not supported". In addition, no file or directory actually present in the host's /tmp can be seen in the guest's /mnt/testbis.
When trying to replace "/tmp" with "/tmp/aaa" on the host, with /tmp/aaa owned by root:root, still running qemu as vm-test, trying to run "ls" in the guest's /mnt/testbis fails with the weird "ls: reading directory '.': Cannot allocate memory", while the directory is empty.
After a "chown vm-test /tmp/aaa", the guest can list the files (despite the permissions already allowing it to do so before), but still not write new files: "cannot touch 'b': Operation not supported".
Do you have a pointer as to what is happening?
PS: complete setup is running all this inside a qemu VM that I use for testing, I guess it shouldn't matter but saying it just in case
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