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Re: [Qemu-devel] [PATCH 19/22] qapi: add QMP put-event command

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 19/22] qapi: add QMP put-event command
Date: Sat, 12 Mar 2011 22:37:34 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Thunderbird/3.1.7

On 03/10/2011 06:42 PM, Anthony Liguori wrote:
Maybe for QMPv2, but for QMPv1, this is going to introduce an extremely incompatible change.

Why?  It's 100% backwards compatible.

It's a very significant change for clients. While technical compatible, it would require a change to the client infrastructure to support the new feature.

Yes. That's generally a good thing, you implement something at the infrastructure level once instead of at a higher level N times.

I'm not saying we shouldn't make a change like this, but we should minimize these type of changes.

I agree, so we should design the protocol well, without planned obsolescence. We'll make some mistakes, but at least they'll be unplanned.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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