Re: [Qemu-devel] [PATCH for-1.5] qmp: add query-drive-mirror-capabilities

[Luiz Capitulino]

On Fri, 26 Apr 2013 15:40:25 +0200
Markus Armbruster <address@hidden> wrote:

> Paolo Bonzini <address@hidden> writes:
> 
> > Il 25/04/2013 14:26, Luiz Capitulino ha scritto:
> >> That's a good point, although I wonder if a command could have a new
> >> capability that's not mapped to a new argument. IOW, I'd expect most/all
> >> new capabilities to always be mapped to new arguments.
> >
> > A new enum value would also be a new capability, but it's handled better
> > by enabling introspection of enum values.
> 
> An extension that adds neither arguments nor argument values is probably
> an incompatible change, not a proper extension.  Don't do that then.

I think Paolo is referring to a command that takes an enumeration as
an argument, eg. transaction.