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VFIO requires all of the guest's memory and IO space to be lockable in RAM. The domain's max_balloon is the maximum amount of memory the domain can have (in KiB). We add a generous 1GiB to that for IO space (still much better than KVM device assignment, where the KVM module actually *ignores* the process limits and locks everything anyway), and convert from KiB to bytes. In the case of hotplug, we are changing the limit for the already existing qemu process (prlimit() is used under the hood), and for regular commandline additions of vfio devices, we schedule a call to setrlimit() that will happen after the qemu process is forked.
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>