Comment 2 for bug 1823458

Note as mentioned in the description, it appears this was fixed upstream by commit e7c83a885f8, which is included starting in version 2.9. However, this commit depends on at least commit 5345fdb4467, and likely more other previous commits, which make widespread code changes and are unsuitable to backport. Therefore this seems like it should be specifically worked around in the Xenial qemu codebase.