This is not a bug. we intentionally do not provide any device ordering guarnetees.
this has been requested several times in the past however we cannot provide this enverant since libvirt does not guretee the addresses it will assign will be stable and the behavior is not portable across different hyperviors. the device role tagging feature was designed to provide an alternitive. https://specs.openstack.org/openstack/nova-specs/specs/mitaka/approved/virt-device-role-tagging.html ** Changed in: nova Status: In Progress => Won't Fix -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1961567 Title: attached PCI devices may change addresses after reboot Status in OpenStack Compute (nova): Won't Fix Bug description: When attaching PCI devices to the instance (e.g. via PCI passthru), the final order and addresses of devices as seen from inside the instance can change between reboots: E.g. these are the snippets from qemu command line args as seen thru `ps`: -device vfio-pci,host=5e:00.1,id=hostdev0,bus=pci.0,addr=0x6 -device vfio-pci,host=5e:00.0,id=hostdev1,bus=pci.0,addr=0x7 after hard reboot: -device vfio-pci,host=5e:00.0,id=hostdev0,bus=pci.0,addr=0x6 -device vfio-pci,host=5e:00.1,id=hostdev1,bus=pci.0,addr=0x7 For some VNF workloads this poses a problem. Instead of forcing the app authors to build complex udev setups inside instances, let's simply order the list always by the pci address. Note that this particular issue was caught in Queens release running under Python2. Unfortunately I do not have means to reproduce that on newer OpenStack, but even if it turns out this is auto-fixed by oredered-by-default dicts in py3.7+, we still support py36. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1961567/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
