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The libxl driver reports different values of maximum memory depending on state of a domain. If inactive, maximum memory value is reported correctly. When active, maximum memory is derived from max_pages value returned by the XEN_SYSCTL_getdomaininfolist sysctl operation. But max_pages can be changed by toolstacks and does not necessarily represent the maximum memory a domain can use during its active lifetime. A better location for determining a domain's maximum memory is the /local/domain/<id>/memory/static-max node in xenstore. This value is set from the libxl_domain_build_info.max_memkb field when creating the domain. Currently it cannot be changed nor can its value be exceeded by a balloon operation. From libvirt's perspective, always reporting maximum memory with virDomainDefGetMemoryTotal() will produce the same results as reading the static-max node in xenstore. Signed-off-by: Jim Fehlig <jfehlig@suse.com>
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>