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[Qemu-devel] [Bug 1018530] Re: No write access in a 9p/virtfs shared fol

From: M. Mohan Kumar
Subject: [Qemu-devel] [Bug 1018530] Re: No write access in a 9p/virtfs shared folder
Date: Wed, 11 Jul 2012 06:09:35 -0000


pass-through security model needs root privilege, if you want to run
qemu as non-root user either you have to use mapped security model or
proxy fs driver. But libvirt does not have support for proxy FS driver.
I posted a patch few months ago to libvirt for enabling the same. I will
do the followup with libvirt list to enable proxy FS in libvirt.

So could you please try mapped security model or run  qemu as root user
and update the results?

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  No write access in a 9p/virtfs shared folder

Status in QEMU:
Status in “qemu-kvm” package in Ubuntu:
  Fix Released

Bug description:
  Ubuntu version:  Ubuntu 12.04 LTS
  Kernel: 3.2.0-25-generic
  Version of qemu-kvm: 1.0+noroms-0ubuntu13

  I have created an shared folder for an virtual machine which is
  managed by libvirt.

  <filesystem type='mount' accessmode='passthrough'>
  <source dir='/storage/data'/>
  <target dir='data'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>

  I mounted it in the virtual machine with this command:  mount -t 9p -o 
trans=virtio,version=9p2000.L data /data
  The filesystem permissions of all files an folders in the shared folder are 
set to 777. I expected that I have the full permissions also in the virtual 

  Regardless of the permissions on the filesystem I cannot write or create 
files and folders in the virtual machine. The original filesystem (/storage) is 
  In another shared folder (similar config in libvirt) which is originally NTFS 
I have no problems.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: qemu-kvm 1.0+noroms-0ubuntu13
  ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
  Uname: Linux 3.2.0-25-generic x86_64
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  Date: Wed Jun 27 20:15:20 2012
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Beta amd64 
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-25-generic 
root=/dev/mapper/system-root ro
  SourcePackage: qemu-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/18/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1208
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A99X EVO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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