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Date: Mon, 09 Jun 2014 15:40:56 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v4 28/29] qmp: add query-memdev
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To: Igor Mammedov <imammedo@redhat.com>
Cc: Hu Tao <hutao@cn.fujitsu.com>, "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel@nongnu.org, Eduardo Habkost <ehabkost@redhat.com>, Yasunori Goto <y-goto@jp.fujitsu.com>

Il 09/06/2014 15:32, Igor Mammedov ha scritto:
>>>>> > >> > +{ 'command': 'query-memdev', 'returns': ['Memdev'] }
>>> > > Could we make it union, that returns MemdevRam + MemdevFile
>>> > >
>>> > > MemdevFile will have additional file-only specific properties.
>>> > >
>> >
>> > Which are the file-only properties (in the current definition of Memdev)?
> in current none, but for file backend exposing 'path' property might be useful
> alternatively instead of union we could add 'type' and optional 'path' fields
> to Memdev
>

Yes, I agree.  I think the latest additions to QAPI actually let you do 
that with a QAPI union while keeping backwards-compatible output for 
other fields.  Ok to do this later?  It should be acceptable for soft 
freeze.

Paolo