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Surprisingly there was a virDomainPCIAddressReleaseAddr() function already, but it was completely unused. Since we don't reserve entire slots at once any more, there is no need to release entire slots either, so we just replace the single call to virDomainPCIAddressReleaseSlot() with a call to virDomainPCIAddressReleaseAddr() and remove the now unused function. The keen observer may be concerned that ...Addr() doesn't call virDomainPCIAddressValidate(), as ...Slot() did. But really the validation was pointless anyway - if the device hadn't been suitable to be connected at that address, it would have failed validation before every being reserved in the first place, so by definition it will pass validation when it is being unplugged. (And anyway, even if something "bad" happened and we managed to have a device incorrectly at the given address, we would still want to be able to free it up for use by a device that *did* validate properly).
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>