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d987f63a45
libvirt's qemu driver doesn't have direct access to the config on the guest side of a network interface, and currently doesn't have any method in place to even inform the guest of the desired config. In the future, an unenforceable attempt to set the guest-side IP info could be made by adding a static host entry to the appropriate dnsmasq configuration (or changing the default dhcp client address on the qemu commandline for type='user' interfaces), or enhancing the guest agent to allow setting an IP address, but for now it can't have any effect, and we don't want to give the illusion that it does. To prevent the "disappearance" of any existing configs with ip address/route info (due to parser failure), this check is added in the newly implemented qemuDomainDeviceDefValidate(), which is only called when a domain is defined or started, *not* when it is reread from disk at libvirtd startup.
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>