Visible, yes, but not in live migration, or in 'info i8254', or
similar. We can live migrate between qcow2 and qed (using block
migration), we should be able to do the same for the two i8254
implementations.
I'm not happy about separate implementations, but that's a minor
details. We can change it 2n+1 times without anybody noticing. Not
so about ABI stuff.
Imagine getting a sosreport that includes a dump of the device tree.
You really want to see something in there that tells you it's an
in-kernel PIT and not the userspace one.
Sure. Not the device tree though. The command line would give all
the information?
Then it's a one off option. We really want as much info as possible
stored in the device tree.
Or 'info i8254' can say something about the implementation. I don't
want to have the user say 'info i8254-kvm'.
info doesn't take a qdev device so yes, it can show whatever we want it
to show.
Regards,
Anthony Liguori
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