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9e2465834f
If the variable store (<nvram>) file is raw qemu can't do a snapshot of it and thus the snapshot fails. QEMU rejects such snapshot by a message which would not be properly interpreted as an error by libvirt. Additionally allowing to use a qcow2 variable store backing file would solve this issue but then it would become eligible to become target of the memory dump. Offline internal snapshot would be incomplete too with either storage format since libvirt does not handle the pflash file in this case. Forbid such snapshot so that we can avoid problems.
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>