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Previously there was no way to have a Q35 domain that didn't have these two controllers. This patch skips their creation as long as there are some other kinds of pci controllers at index 1 and 2 (e.g. some pcie-root-port controllers). I'm hoping that soon we won't add them at all, plugging all devices into auto-added pcie-*-port ports instead, but in the meantime this makes it easier to experiment with alternative bus hierarchies.
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>