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Date: Fri, 26 Apr 2013 09:54:54 -0400
From: Luiz Capitulino <lcapitulino@redhat.com>
Message-ID: <20130426095454.68e7bdae@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH for-1.5] qmp: add
 query-drive-mirror-capabilities
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To: Markus Armbruster <armbru@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

On Fri, 26 Apr 2013 15:40:25 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> Paolo Bonzini <pbonzini@redhat.com> 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.