yahoo-eng-team team mailing list archive

[Johannes Kulik <2099663@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
When creating a flavor with `hw:maxphysaddr_mode='passthrough'`, spawning a VM with that flavor fails in our env.

Steps to reproduce
==================
* set `hw:maxphysaddr_mode='passthrough' on a flavor's extra_specs
* spawn a VM with that flavor


Expected result
===============
VM spawns.

Actual result
=============
We found an exception in the logs.

Environment
===========
We're running Nova 2023.2 (bobcat) with the libvirt + KVM hypervisor.

Logs & Configs
==============
```
  File "/var/lib/openstack/lib/python3.10/site-packages/nova/virt/libvirt/config.py", line 792, in parse_dom
   self.bits = int(xmldoc.get("bits"))
TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'
```

Side note: Setting `hw:maxphysaddr_bits` doesn't work with mode `passthrough`, so this is not a workaround:
> CPU maximum physical address bits number specification cannot be used with mode='passthrough'

** Affects: nova
     Importance: Undecided
         Status: In Progress

-- 
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https://bugs.launchpad.net/bugs/2099663

Title:
  Failure spawning VMs with hw:maxphysaddr_mode passthrough

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Description
  ===========
  When creating a flavor with `hw:maxphysaddr_mode='passthrough'`, spawning a VM with that flavor fails in our env.

  Steps to reproduce
  ==================
  * set `hw:maxphysaddr_mode='passthrough' on a flavor's extra_specs
  * spawn a VM with that flavor

  
  Expected result
  ===============
  VM spawns.

  Actual result
  =============
  We found an exception in the logs.

  Environment
  ===========
  We're running Nova 2023.2 (bobcat) with the libvirt + KVM hypervisor.

  Logs & Configs
  ==============
  ```
    File "/var/lib/openstack/lib/python3.10/site-packages/nova/virt/libvirt/config.py", line 792, in parse_dom
     self.bits = int(xmldoc.get("bits"))
  TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'
  ```

  Side note: Setting `hw:maxphysaddr_bits` doesn't work with mode `passthrough`, so this is not a workaround:
  > CPU maximum physical address bits number specification cannot be used with mode='passthrough'

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