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As there are two possible approaches to define a domain's memory size - one used with legacy, non-NUMA VMs configured in the <memory> element and per-node based approach on NUMA machines - the user needs to make sure that both are specified correctly in the NUMA case. To avoid this burden on the user I'd like to replace the NUMA case with automatic totaling of the memory size. To achieve this I need to replace direct access to the virDomainMemtune's 'max_balloon' field with two separate getters depending on the desired size. The two sizes are needed as: 1) Startup memory size doesn't include memory modules in some hypervisors. 2) After startup these count as the usable memory size. Note that the comments for the functions are future aware and document state that will be present after a few later patches.
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>