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Re: [Qemu-block] [Qemu-devel] [PATCH v10 09/16] block: Add QMP support f

From: Alberto Garcia
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH v10 09/16] block: Add QMP support for streaming to an intermediate layer
Date: Wed, 12 Oct 2016 11:28:43 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Tue 11 Oct 2016 06:32:39 PM CEST, Markus Armbruster wrote:

>>> 3) QEMU could advertise that feature to the client. This is probably
>>> simpler than trying to figure it out from the API. I guess that's
>>> the idea of 'qmp_capabilities'?
>> I think that was the idea, though it was never used. If we had used
>> it, I'm not sure how long the capabilities list would be today. :-)
> QMP capabilities are for changes in the QMP protocol, not for changes
> in commands, events and types.  The protocol has been good enough so
> far, thus no capabilities.

I see. Wouldn't it make sense in general to have a way to ask QEMU
whether some certain feature is supported?


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