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Real Q35 hardware has an ICH9 chip that includes several integrated devices at particular addresses (see the file docs/q35-chipset.cfg in the qemu source). libvirt already attempts to put the first two sets of ich9 USB2 controllers it finds at 00:1D.* and 00:1A.* to match the real hardware. This patch does the same for the ich9 "HD audio" device. The main inspiration for this patch is that currently the *only* device in a reasonable "workstation" type virtual machine config that requires a legacy PCI slot is the audio device, Without this patch, the standard Q35 machine created by virt-manager will have a dmi-to-pci-bridge and a pci-bridge just for the sound device; with the patch (and if you change the sound device model from the default "ich6" to "ich9"), the machine definition constructed by virt-manager has absolutely no legacy PCI controllers - any legacy PCI devices (e.g. video and sound) are on pcie-root as integrated devices.
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>