Yes, it is still possible to create an instance after changing only the
delete method. The generated libvirt domain XML looks like this:
<os>
<type arch='aarch64' machine='virt'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/AAVMF/AAVMF_CODE.fd</loader>
<nvram
template='/usr/share/AAVMF/AAVMF_CODE.fd'>/var/lib/libvirt/qemu/nvram/instance-00000005_VARS.fd</nvram>
<boot dev='hd'/>
</os>
That is, the nvram file is copied from a global template to an instance-
specific file -- it's that file under /var/lib/libvirt/qemu/nvram that
VIR_DOMAIN_UNDEFINE_NVRAM removes. It should arguably be using
template=AAVMF_VARS.fd rather than AAVMF_CODE.fd, but that's unrelated
to this and doesn't really matter.
The most annoying part of this change is feature detection. I think
delete_configuration might have to know to try unsetting flags until the method
works, as older libvirts don't support VIR_DOMAIN_UNDEFINE_NVRAM and I can't
see a way to test at runtime. But in our environment we know the libvirt
version, so we just pass the flag in unconditionally.
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https://bugs.launchpad.net/bugs/1567807
Title:
nova delete doesn't work with EFI booted VMs
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