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The qemu driver accesses fields in the virDomainNetDef directly, but with the advent of the virDomainActualNetDef, some pieces of information may be found in a different place (the ActualNetDef) if the network connection is of type='network' and that network is of forward type='bridge|private|vepa|passthrough'. The previous patch added functions to mask this difference from callers - they hide the decision making process and just pick the value from the proper place. This patch uses those functions in the qemu driver as a first step in making qemu work with the new network types. At this point, the virDomainActualNetDef is guaranteed always NULL, so the GetActualX() function will return exactly what the def->X that's being replaced would have returned (ie bisecting is not compromised). There is one place (in qemu_driver.c) where the internal details of the NetDef are directly manipulated by the code, so the GetActual functions cannot be used there without extra additional code; that file will be treated in a separate patch.
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>