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When qemuAssignDevicePCISlots() is looking for companion controllers for a USB controller that has no PCI address specified, it initializes a virDevicePCIAddress to 0000:00:00.0, fills it in with the companion's address if one is found, then checks whether or not there was a find based on slot == 0. On a system with a single PCI bus, that is a valid way to check, because slot 0 is reserved, but on most other PCI buses, slot 0 is not reserved, and is open for use by any device. This patch adds a separate bool that is set when a companion is found rather than relying on the faulty information provided with "slot == 0".
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>