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If a domain is explicitly configured with <seclabel type="none"/> we correctly ensure that no labeling will be done by setting norelabel=true. However, if no seclabel element is present in domain XML and hypervisor is configured not to confine domains by default, we only set type to "none" without turning off relabeling. Thus if such a domain is being started, security driver wants to relabel resources with default label, which doesn't make any sense. Moreover, with SELinux security driver, the generated image label lacks "s0" sensitivity, which causes setfilecon() fail with EINVAL in enforcing mode.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>