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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 684BFC678D4 for ; Fri, 3 Mar 2023 11:39:49 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pY3l2-0005O1-S8; Fri, 03 Mar 2023 06:39:28 -0500 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 1pY3kw-0005J0-L7 for qemu-devel@nongnu.org; Fri, 03 Mar 2023 06:39:23 -0500 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 1pY3ku-0000q7-Be for qemu-devel@nongnu.org; Fri, 03 Mar 2023 06:39:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677843559; 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:in-reply-to:in-reply-to: references:references; bh=Sexof3CaldIYpbgHhQFfPYuNh/PjDrWj3k12Gp1hVDo=; b=QsMuFKRu6YCU9QIvnzrdbhwKgBBlkXTGIaAPOVbpbLOOZxohzycKYIaasqTd2eRLUKHWJo HrF8dk8siFLWH++hzMF/CNrD2TP3LlSCek61jfclFuYmzqRq2g9LPgjaQ1QI/rSxAOIbdv anfSCNm2cGpgHlVLgCGPMJ/pk2D9aCc= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-374-7_OlWQwlO0GNqGzgpw94mw-1; Fri, 03 Mar 2023 06:39:15 -0500 X-MC-Unique: 7_OlWQwlO0GNqGzgpw94mw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5BA9B29AA3B0; Fri, 3 Mar 2023 11:39:15 +0000 (UTC) Received: from redhat.com (unknown [10.33.36.53]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E45B6140EBF4; Fri, 3 Mar 2023 11:39:11 +0000 (UTC) Date: Fri, 3 Mar 2023 11:39:09 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Thomas Huth Cc: Peter Maydell , qemu-devel@nongnu.org, Paolo Bonzini , Markus Armbruster , Alex =?utf-8?Q?Benn=C3=A9e?= , qemu-arm@nongnu.org, Maxim Levitsky , libvir-list@redhat.com, Richard Henderson , xen-devel@lists.xenproject.org, Reinoud Zandijk Subject: Re: [PATCH v2 4/6] docs/about/deprecated: Deprecate the qemu-system-arm binary Message-ID: References: <20230302163106.465559-1-thuth@redhat.com> <20230302163106.465559-5-thuth@redhat.com> <4e6512e4-b159-cbe2-5f74-89fab25208e6@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4e6512e4-b159-cbe2-5f74-89fab25208e6@redhat.com> User-Agent: Mutt/2.2.9 (2022-11-12) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, Mar 03, 2023 at 12:31:42PM +0100, Thomas Huth wrote: > On 03/03/2023 12.16, Peter Maydell wrote: > > On Thu, 2 Mar 2023 at 16:31, Thomas Huth wrote: > > > > > > qemu-system-aarch64 is a proper superset of qemu-system-arm, > > > and the latter was mainly still required for 32-bit KVM support. > > > But this 32-bit KVM arm support has been dropped in the Linux > > > kernel a couple of years ago already, so we don't really need > > > qemu-system-arm anymore, thus deprecated it now. > > > > > > Signed-off-by: Thomas Huth > > > --- > > > docs/about/deprecated.rst | 10 ++++++++++ > > > 1 file changed, 10 insertions(+) > > > > > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > > > index a30aa8dfdf..21ce70b5c9 100644 > > > --- a/docs/about/deprecated.rst > > > +++ b/docs/about/deprecated.rst > > > @@ -45,6 +45,16 @@ run 32-bit guests by selecting a 32-bit CPU model, including KVM support > > > on x86_64 hosts. Thus users are recommended to reconfigure their systems > > > to use the ``qemu-system-x86_64`` binary instead. > > > > > > +``qemu-system-arm`` binary (since 8.0) > > > +'''''''''''''''''''''''''''''''''''''' > > > + > > > +``qemu-system-aarch64`` is a proper superset of ``qemu-system-arm``. > > > > I think this is not quite true -- at the moment if you want > > "every feature we implement, 32-bit" the only way to get > > that is 'qemu-system-arm -cpu max'. The '-cpu max' on > > qemu-system-aarch64 is 64-bit, and we don't implement for TCG > > the "-cpu max,aarch64=off" syntax that we do for KVM that would > > let the user say "no 64-bit support". > > Ok ... so what does that mean now? ... can we continue with this patch, e.g. > after rephrasing the text a little bit, or do we need to implement "-cpu > max,aarch64=off" for TCG first? I think we need to have a way to request the max 32-bit CPU before we deprecate, because deprecation has to tell people what they should use instead. For qemu-system-i686 -cpu max, I guess we have lm=off to hide the 64-bit support, so that's OK from QEMU POV, but will need libvirt enhancement as I don't think we've taken that into account. 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 :|