Commit dbf1f68410 ("security: do not remember/recall labels for VFIO")
rightly changed the DAC and SELinux labeling parameters to fix a problem
with "VFIO hostdevs" but really only addressed the PCI codepaths.
As a result, we can still encounter this with VFIO MDEVs such as
vfio-ccw and vfio-ap, which can fail on a hotplug:
[test@host ~]# mdevctl stop -u 11f2d2bc-4083-431d-a023-eff72715c4f0
[test@host ~]# mdevctl start -u 11f2d2bc-4083-431d-a023-eff72715c4f0
[test@host ~]# cat disk.xml
<hostdev mode='subsystem' type='mdev' model='vfio-ccw'>
<source>
<address uuid='11f2d2bc-4083-431d-a023-eff72715c4f0'/>
</source>
<address type='ccw' cssid='0xfe' ssid='0x0' devno='0x3c51'/>
</hostdev>
[test@host ~]# virsh attach-device guest ~/disk.xml
error: Failed to attach device from /home/test/disk.xml
error: Requested operation is not valid: Setting different SELinux label on /dev/vfio/3 which is already in use
Make the same changes as reported in commit dbf1f68410, for the mdev paths.
Reported-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
ebd004a03d