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The history of USB controller for ppc64 guest is complex and goes back to libvirt 1.3.1 where the fun started. Prior Libvirt 1.3.1 if no model for USB controller was specified we've simply passed "-usb" on QEMU command line. Since Libvirt 1.3.1 there is a patch (8156493d8db) that fixes this issue by using "-device pci-ohci,..." but it breaks migration with older Libvirts which was agreed that's acceptable. However this patch didn't reflect this change in the domain XML and the model was still missing. Since Libvirt 2.2.0 there is a patch (f55eaccb0c5) that fixes the issue with not setting the USB model into domain XML which we need to know about to not break the migration and since the default model was *pci-ohci* it was used as default in this patch as well. This patch tries to take all the previous changes into account and also change the default for newly defined domains that don't specify any model for USB controller. The VIR_DOMAIN_DEF_PARSE_ABI_UPDATE is set only if new domain is defined or new device is added into a domain which means that in all other cases we will use the old *pci-ohci* model instead of the better and not broken *nec-usb-xhci* model. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1373184 Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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>