Re: [libvirt] [PATCH 3/3] qemu: Forbid user aliases for USB controllers

https://bugzilla.redhat.com/show_bug.cgi?id=1552127 These are bit different than other devices. Their alias also specify the name of the bus. For instance, if there are these 'joined' USB devices: <controller type='usb' index='0' model='ich9-ehci1'> <alias name='ua-myUSB'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/> </controller> which translates to cmd line as: -device ich9-usb-ehci1,id=ua-myUSB,bus=pci.0,addr=0x4.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x4 The problem is that UHCI is still trying to serve 'usb.0' bus. Rather than trying to come up with some complicated algorithm to make everything work, lets forbid user aliases for USB controllers.