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When cgroups is enabled, access to block devices is likely to be restricted to a whitelist. Prior to saving a guest to a block device, it is necessary to add the block device to the whitelist. This is not required upon restore, since QEMU reads from stdin * src/qemu/qemu_driver.c: Add block device to cgroups whitelist if neccessary during domain save.
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>