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The implicit IDE, USB, and video controllers provided by the PIIX3 chipset in the pc-* machinetypes are not present on other machinetypes, so we shouldn't be doing the special checking for them. This patch places those validation checks into a separate function that is only called for machine types that have a PIIX3 chip (which happens to be the i440fx-based pc-* machine types). One qemuxml2argv test data file had to be changed - the pseries-usb-multi test had included a piix3-usb-uhci device, which was being placed at a specific address, and also had slot 2 auto reserved for a video device, but the pseries virtual machine doesn't actually have a PIIX3 chip, so even if there was a piix3-usb-uhci driver for it, the device wouldn't need to reside at slot 1 function 2. I just changed the .argv file to have the generic slot info for the two devices that results when the special PIIX3 code isn't executed.
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>