The first change completes a several years old but still incomplete change. As mentioned there, reverting the original change may also be an option. The second change works around some odd libxl behavior, as described in [1]. As per a response to that mail addressing the issue in libxl may also be possible, but it's not clear to me who would get to doing so at which point in time. Hence the kernel side alternative is being proposed here.
As to Konrad being on the Cc list: I find it puzzling that he's listed under "XEN PCI SUBSYSTEM", but pciback isn't considered part of this. 1: redo VF placement in the virtual topology 2: reconfigure also from backend watch handler Jan [1] https://lists.xen.org/archives/html/xen-devel/2021-03/msg00956.html
