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Mon, 9 Nov 2026 16:42:13 +0000 (UTC) Received: from redhat.com (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id CAC5D18004E9; Mon, 9 Nov 2026 16:42:11 +0000 (UTC) Date: Mon, 9 Nov 2026 16:42:08 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Stefan Hajnoczi Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, Pierrick Bouvier , Kevin Wolf , devel@lists.libvirt.org Subject: Re: [PATCH for-12] qed: deprecate the block driver Message-ID: References: <20261109163431.443983-1-stefanha@redhat.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261109163431.443983-1-stefanha@redhat.com> User-Agent: Mutt/2.4.3 (2026-10-09) X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 5 X-Spam_score: 0.5 X-Spam_bar: / X-Spam_report: (0.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org X-Spam-Status: No, score=-17.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon, Nov 09, 2026 at 09:34:31AM -0700, Stefan Hajnoczi wrote: > It has been unofficially deprecated on the wiki for many years: > https://wiki.qemu.org/Features/QED > > Signed-off-by: Stefan Hajnoczi > --- > docs/about/deprecated.rst | 13 +++++++++++++ > 1 file changed, 13 insertions(+) How about bdrv_qed_open also adding warn_report_once("QED is deprecated, please switch to qcow2"); for the part of the user population who never reads the docs. > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > index 0891bbc44de..ab83626af0b 100644 > --- a/docs/about/deprecated.rst > +++ b/docs/about/deprecated.rst > @@ -526,3 +526,16 @@ If the user requests a modern x86 CPU model (i.e. not one of ``486``, > ``athlon``, ``kvm32``, ``pentium``, ``pentium2``, ``pentium3``or ``qemu32``) > a warning will be displayed until a future QEMU version when such CPUs will > be rejected. > + > +Block drivers > +------------- > + > +QED (since 12.0) > +'''''''''''''''' > + > +The QED disk image format is not actively maintained and qcow2 has exceeded its > +features and performance for many years. Since QED was never widely deployed, > +the format is not required for compatibility reasons. It is unlikely that > +qemu-img users still need to convert images to or from QED. > + > +Use qcow2 instead of QED. > -- > 2.56.0 > With regards, Daniel -- |: https://berrange.com ~~ https://hachyderm.io/@berrange :| |: https://libvirt.org ~~ https://entangle-photo.org :| |: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|