(This issue is based on an OSP 17.0 bug report by Alex Stupnikov:
"Nova errors out due to libvirt failing to parse PCI device VPD (virtual private data" — https://bugzilla.redhat.com/show_bug.cgi?id=2259641)

Description
---------------
This is a hardware-specific bug; libvirt failing to parse PCI device VPD (virtual private data) for some hardware:

    <vendor_field index='Z'>6<1</vendor_field>

Which results in:

    lxml.etree.XMLSyntaxError: StartTag: invalid element name

Root cause
---------------

Daniel Berrangé and Peter Krempa from libvirt confirmed that it's a libvirt bug.

Dan writes: "we (libvirt) are using virBufferAsprintf instead of virBufferEscapeString"

So the issue here to be libvirt not escaping a string.

Version details
--------------------

Affected versions (from the OSP container running the libvirt daemon and the guests):

$ podman exec -it nova_virtqemud virsh version
    Compiled against library: libvirt 9.0.0
    Using library: libvirt 9.0.0
    Using API: QEMU 9.0.0
    Running hypervisor: QEMU 7.2.0}}