From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from list by lists.gnu.org with archive (Exim 4.90_1) id 1rpTLY-0003YV-I2 for mharc-qemu-trivial@gnu.org; Wed, 27 Mar 2024 09:29:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rpTLU-0003SE-E4 for qemu-trivial@nongnu.org; Wed, 27 Mar 2024 09:29:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rpTLS-0005tk-Eo for qemu-trivial@nongnu.org; Wed, 27 Mar 2024 09:29:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1711546173; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1R2fhnB6WSz93d8jDJMNiZ3/P8mtlL0m04nl8sywi7c=; b=D4ciQZL0tmXq5/NdIhhYSS3LYNpz3OVB2KINVFX7XrSbfVlpwF0evttOgbhaSvezwoHf3U OAl7PkJGbmf/gSSKi4929fZel8/VGBw6hglguQUpuUgagarq7TzSvKdyFE87GwNfJl+PlX 8yKb0PSOMsz61dE4hiSxfCcvPD44+KE= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-320-OXBsQmNnMUKnlZMPxr-TEQ-1; Wed, 27 Mar 2024 09:29:30 -0400 X-MC-Unique: OXBsQmNnMUKnlZMPxr-TEQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DAD431C2CDE0; Wed, 27 Mar 2024 13:29:29 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.186]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5235D200A384; Wed, 27 Mar 2024 13:29:28 +0000 (UTC) Date: Wed, 27 Mar 2024 13:29:22 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Peter Maydell Cc: Igor Mammedov , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Thomas Huth , qemu-devel@nongnu.org, Bernhard Beschow , pbonzini@redhat.com, devel@lists.libvirt.org, richard.henderson@linaro.org, mst@redhat.com, qemu-trivial@nongnu.org Subject: Re: [PATCH for-9.0] docs/about: Mark the iaspc machine type as deprecated Message-ID: Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= References: <20240326125104.90103-1-imammedo@redhat.com> <8dbba6ae-5910-4a62-9a08-a56e20dfb480@linaro.org> <20240326171632.3cc7533d@imammedo.users.ipa.redhat.com> <20240327140917.69d86539@imammedo.users.ipa.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/2.2.12 (2023-09-09) X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-trivial@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Mar 2024 13:29:38 -0000 On Wed, Mar 27, 2024 at 01:27:58PM +0000, Peter Maydell wrote: > On Wed, 27 Mar 2024 at 13:23, Daniel P. Berrangé wrote: > > > > On Wed, Mar 27, 2024 at 02:09:17PM +0100, Igor Mammedov wrote: > > > On Wed, 27 Mar 2024 10:49:43 +0000 > > > Daniel P. Berrangé wrote: > > > It's question of whether we are willing to do unthinkable, > > > i.e. to break QEMU <-> guest ABI for isapc case by removing > > > corresponding fwcfg entries. > > > > There has never been any ABI stability requirement for 'isapc' > > as it is not a versioned machine type. > > > > > With migration ignored it shouldn't be a problem. > > > Question is: does anyone care about migration with isapc? > > > If not, I'd gladly axe smbios legacy parts in 9.1 > > > > Migration is irrelevant unless someone steps forward to > > commit to long term versioning of the machine type. > > But migration is also how we implement savevm/loadvm, > which are useful even when the machine type is not versioned. > So please don't put in migration blockers or similar that would > break that. Yep, that's valid use case within the scope of a single QEMU release. We just can't guarantee it across versions. Often it'll probably work but it is liable to break at times. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|