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In order to allow <address type='pci'/> with no other attributes to mean "I want a PCI address, but any PCI address will do" (just as having no <address> at all usually indicates), we will need to change several places in the code from a simple "info->type == (or !=) VIR_DOMAIN_DEVICE_ADDRESS_TYPE_(PCI|NONE)" into something slightly more complex, this patch adds to new functions that take a virDomainDeviceInfoPtr and return true/false depending on 1) whether the current state of the info indicates that we "want" a PCI address for this device (virDeviceInfoPCIAddressWanted()) and 2) whether this device already has a valid PCI address (virDeviceInfoPCIAddressPresent()). Both of these functions required the simpler check for whether a pci address is "empty" (i.e. all of its attributes are 0, which can never happen in a real PCI address, since slot 0 of bus 0 of domain 0 is always reserved), so that function is also added.
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>