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After libvirt issues the balloon resize command, the current balloon size needs to be changed to the maximum memory size since the vCPUs were not started and thus the balloon driver could not return the memory. Since GetXMLDesc and other APIs return the balloon size without updating it in case they are not able to obtain the job and the memory balloon does not support the asynchronous event the sizing might be incorrect.
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>