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Both the hal and udev drivers call virPCI*() functions to the the SRIOV VF/PF info about PCI devices, and the UDEV backend calls virPCI*() to get IOMMU group info. Since there is now a single function call in node_device_linux_sysfs.c to do all of this, replace all that code in the two backends with calls to nodeDeviceSysfsGetPCIRelatedDevCaps(). Note that this results in the HAL driver (probably) unnecessarily calling virPCIDevieAddressGetIOMMUGroupNum(), but in the case that the host doesn't support IOMMU groups, that function turns into a NOP (it returns -2, which causes the caller to skip the call to virPCIDeviceAddressGetIOMMUGroupAddresses()). So in the worst case it is a few extra cycles spent, and in the best case a mythical platform that supported IOMMU groups but used HAL rather than UDEV would gain proper reporting of IOMMU group info.
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>