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The USB-specific cgroup setup had been inserted inline in qemuDomainAttachHostUsbDevice and qemuSetupCgroup, but now there is a common cgroup setup function called for all hostdevs, so it makes sens to put the usb-specific setup there and just rely on that function being called. The one thing I'm uncertain of here (and a reason for not pushing until after release) is that previously hostdev->missing was checked only when starting a domain (and cgroup setup for the device skipped if missing was true), but with this consolidation, it is now checked in the case of hotplug as well. I don't know if this will have any practical effect (does it make sense to hotplug a "missing" usb device?)
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>