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If there's a memory leak in qemu or qemu is exploited the host's system will sooner or later start trashing instead of killing the bad process. This however has impact on performance and other guests as well. Therefore we should set a reasonable RSS limit even when user hasn't set any. It's better to be secure by default.
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>