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qemu user session shared filesystem

asked 2015-11-28 00:59:25 -0500

dimitrisk gravatar image

updated 2015-11-28 14:05:47 -0500

Hi there,

This is all with F23 host and guest(s):

I've been using a number of user session VMs for a while. I need to share files from my (non-root) host user's home directory with (also non-root, preferably) users in the guests. So far I've been using sshfs.

I'd like to switch to using virtio-9p as sshfs/SFTP does seem to be slowing things down. I (think I) have managed to get around the SELinux hurdle by setting the host shared directory's SELinux context to the virt_content_t type - I see no SELinux warnings when I read or (try to) write to the shared directory from the guest.

However, trying to write to the shared directory from the guest always results in a "permission denied" error.

I've tried all the combinations of the "security model" option, with no change in behavior. Any ideas will be much appreciated.

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answered 2015-11-28 15:04:21 -0500

dimitrisk gravatar image

Answering (tentatively) my own question here: I must have missed this SELinux context/access mode combo earlier.

The filesystem export is defined in the VM (added through virt-manager) as:

<filesystem type='mount' accessmode='squash'>
  <source dir='/home/d/wkto_share'/>
  <target dir='/wkto_share'/>
  <alias name='fs0'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>

The host-side shared dir is labeled with:

drwxrwxr-x. 2 d d unconfined_u:object_r:svirt_home_t:s0 4096 Nov 28 12:47 wkto_share

It's in the guest's /etc/fstab as:

/wkto_share                               /home/d/wkto_share      9p      defaults,noauto

I now seem to have read/write access from both host and guest side.

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Asked: 2015-11-28 00:58:47 -0500

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Last updated: Nov 28 '15