[Bug 1673957] Re: virtfs: mapped-xattr on mount point

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting all older bugs to
"Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1673957

Title:
  virtfs: mapped-xattr on mount point

Status in QEMU:
  Incomplete

Bug description:
  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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