Thanks for this good report!
And also thanks for providing the workaround for anyone else running into this.
The old types should (tm) not change due to the compat layers that on
any change ensure that former types have the old values set. That is an
issue within qemu.
I don't see yet why that would be specific to windows guests, but maybe
their drivers trigger something Linux wont.
P.S. I know you now got it migrated, still I'd strongly encourage to
bump to a more recent machine type at e.g. a planned service downtime
window or such. You just don't want to carry things forever.
** Changed in: libvirt (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1902654
Title:
failure to migrate virtual machines with pc-i440fx-wily type to ubuntu
20.04
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