Public bug reported:
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.
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1961567
Title:
attached PCI devices may change addresses after reboot
Status in OpenStack Compute (nova):
New
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
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