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When support for auto-creating tap devices was added to <interface type='ethernet'> in commit 9c17d6, the code assumed that virNetDevTapCreate() would honor the VIR_NETDEV_TAP__CREATE_IFUP flag that is supported by virNetDevTapCreateInBridgePort(). That isn't the case - the latter function performs several operations, and one of them is setting the tap device online. But virNetDevTapCreate() *only* creates the tap device, and relies on the caller to do everything else, so qemuInterfaceEthernetConnect() needs to call virNetDevSetOnline() after the device is successfully created.
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>