Comment 9 for bug 1561497

Issue still present when attempting to create MIPS guest via virt-manager, and adding additional environments with same issue (virt-install and openstack nova leveraging libvirt). Attempts were made across multiple paths still receiving same error message 'XML error: No PCI buses available' when trying to define a VM using mips64el architecture.

System Information:

Description: Ubuntu Focal Fossa
Release: 20.04.3 LTS
Linux version 5.4.0-88-generic (buildd@lgw01-amd64-008) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #99-Ubuntu SMP Thu Sep 23 17:29:00 UTC 2021 (Ubuntu 5.4.0-88.99-generic 5.4.140)

Binary Information:

/usr/sbin/libvirtd
libvirtd (libvirt) 6.0.0

XML and Trace Errors:

- virt-install attempt
### https://pastebin.com/nuPPieaw
Error Message: ERROR XML error: No PCI buses available

- virt-manager attempt
### https://pastebin.com/camUditW
Error Message: libvirt.libvirtError: XML error: No PCI buses available

- openstack attempt
### https://pastebin.com/3Tsj7Cxz
### https://pastebin.com/6VunTvpy
Error Message: libvirt.libvirtError: XML error: No PCI buses available

reference for original patch details: https://listman.redhat.com/archives/libvir-list/2016-May/msg00197.html
reference for original ubuntu bug details: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1561497