[CentOS-virt] libvirt/kvm changes /dev/ttyS0

Fri Sep 19 14:15:02 UTC 2014
lhecking at users.sourceforge.net <lhecking at users.sourceforge.net>

>  When I launch the vm, setroubleshootd goes into overdrive and creates massive
>  logs, and /var/log/messages starts growing significantly also. The reason is
>  that as soon as the vm starts, ownership and context of /dev/ttyS0 on the host
>  are being reset. Why is that, and how can I prevent it from happening?
>  Should be:
> crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyS0
>  Changes to:
> crw-rw----. qemu qemu unconfined_u:object_r:svirt_image_t:s0:c9,c796 /dev/ttyS0
 One way of doing this: https://bugzilla.redhat.com/show_bug.cgi?id=596553#c4
 (no. 1). This avoids resetting of group ownership to root instead of dialout.

 In addition, I had to add qemu to the disk group to access the /dev/dm* device
 that serves as vm disk.

 Also found qemu_use_comm and set it to on, for what it's worth ...