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https://bugzilla.redhat.com/show_bug.cgi?id=947387 If a user configures a domain to use a seclabel of a specific type, but the appropriate driver is not accessible, we should refuse to start the domain. For instance, if user requires selinux, but it is either non present in the system, or is just disabled, we should not start the domain. Moreover, since we are touching only those labels we have a security driver for, the other labels may confuse libvirt when reconnecting to a domain on libvirtd restart. In our selinux example, when starting up a domain, missing security label is okay, as we auto-generate one. But later, when libvirt is re-connecting to a live qemu instance, we parse a state XML, where security label is required and it is an error if missing: error : virSecurityLabelDefParseXML:3228 : XML error: security label is missing This results in a qemu process left behind without any libvirt control.
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>