From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E07CFC3F68F for ; Fri, 24 Jan 2020 18:59:17 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A24DF2071E for ; Fri, 24 Jan 2020 18:59:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AmXHJAmb" DMARC-Filter: 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(int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B7DC81800D78; Fri, 24 Jan 2020 18:58:30 +0000 (UTC) Received: from [10.10.124.155] (ovpn-124-155.rdu2.redhat.com [10.10.124.155]) by smtp.corp.redhat.com (Postfix) with ESMTP id E9F0186802; Fri, 24 Jan 2020 18:58:23 +0000 (UTC) Subject: Re: Making QEMU easier for management tools and applications To: "Dr. David Alan Gilbert" References: <878slyej29.fsf@dusky.pond.sub.org> <20200123190145.GI657556@redhat.com> <2561a069-ce5f-3c30-b04e-db7cd2fcdc85@redhat.com> <871rrp474i.fsf@dusky.pond.sub.org> <20200124102743.GB824327@redhat.com> <20200124143841.GG4732@dhcp-200-226.str.redhat.com> <20200124183036.GD2969@work-vm> <50637c89-1c5d-ef1b-4c8c-f23de732bcbc@redhat.com> <20200124185208.GB2970@work-vm> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= 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charset=utf-8 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , Eduardo Habkost , Cleber Rosa , "Denis V. Lunev" , Stefan Hajnoczi , Markus Armbruster , qemu-devel , Paolo Bonzini , =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , Dominik Csapak Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 1/24/20 1:52 PM, Dr. David Alan Gilbert wrote: > * John Snow (jsnow@redhat.com) wrote: >> >> >> On 1/24/20 1:30 PM, Dr. David Alan Gilbert wrote: >>> However, I caution that too many people think that QMP has all the type >>> of diagnostic stuff people want - it's just way too hard and beuracratic >>> to add a simple diagnostic command to QMP, when you just want to add >>> something to print some diagnostics out for your corner of qemu. >> >> I'm not sure I follow, do you mean bureaucratic in contrast to... HMP? > > I mean, someone who adds a QMP command is expected to be a lot more > careful about the long term stability and proper structures etc etc. > Where for HMP, if someone wants to add a command that's useful to the > diagnostics of their part of QEMU and doesn't break anything else, then > fine. > > Dave It sounds like we want a formalized notion of "x-debug-" for QMP commands where we use feature flags to explicitly mark a command interface as a debugging interface. (We use such a command for bitmap iotests, to compute checksums of bitmaps to ensure they migrate correctly. We make no guarantee that this is stable or useful.) I'm not sure if it's wise or not, but we could disable these commands entirely unless you configure with --enable-qmp-debugging. Might ease that pain of migrating everything onto QMP. --js