Comment 23 for bug 1709877

I agree to your summary.
I was considering this being "open" so long without being a major issue for anyone combined with the required work getting bigger to implement/fix it for real. So of the two choices:

a) having the error statement while trying hotplug be improved saying hotplug is not supported with that version of qemu/libvirt
b) bring in all the necessary changes required for vcpu hotplug in xenial aswell.

b) imho seems like a rabbithole of changes and even potential regression for more important cases. Especially that there is an LTS released where things are fine (18.04)
a) seems to be less invasive and the right situation given the situation.

Therefore after that being "selected", would you mind prepping a change that you'd want us to add for that improved message when people are trying to use Hotplug on Xenial?