From patchwork Mon Feb 27 11:10:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 13153206 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.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 D0F8BC64ED6 for ; Mon, 27 Feb 2023 11:11:21 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.502369.774129 (Exim 4.92) (envelope-from ) id 1pWbPR-0004ly-Oq; Mon, 27 Feb 2023 11:11:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 502369.774129; Mon, 27 Feb 2023 11:11:09 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pWbPR-0004lC-Hf; Mon, 27 Feb 2023 11:11:09 +0000 Received: by outflank-mailman (input) for mailman id 502369; Mon, 27 Feb 2023 11:11:07 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pWbPP-0004iF-Q8 for xen-devel@lists.xenproject.org; Mon, 27 Feb 2023 11:11:07 +0000 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 6d2912c1-b68f-11ed-88bb-e56d68cac8db; Mon, 27 Feb 2023 12:11:05 +0100 (CET) Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-74-DJ-jRS76Mjy4jXphQxQ3Uw-1; Mon, 27 Feb 2023 06:11:01 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 996A7101A521; Mon, 27 Feb 2023 11:11:00 +0000 (UTC) Received: from thuth.com (unknown [10.45.227.26]) by smtp.corp.redhat.com (Postfix) with ESMTP id 348B440C6EC4; Mon, 27 Feb 2023 11:10:58 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 6d2912c1-b68f-11ed-88bb-e56d68cac8db DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677496264; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KioUJTM1KSsfU9iQtLnRn1SvfePLH+pSeG29+t/WJ4c=; b=foGPiIr6kX+diJGlxiVLlXqr+CVhEjSZywLo57EbubDu1CkSavZz034YU81YT9aiLEcuSm MoGg55Di95uZLtfIieoIPeLlvGe/5JumY1lych27hrvUcUdIZrx4yn/qxHTWTcTuRpDXY4 uVAwJQkgHhfvXU4JS4dUfREfdEMCraY= X-MC-Unique: DJ-jRS76Mjy4jXphQxQ3Uw-1 From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell , Daniel Berrange , Paolo Bonzini Cc: Markus Armbruster , =?utf-8?q?Alex_Benn=C3=A9e?= , qemu-arm@nongnu.org, Maxim Levitsky , libvir-list@redhat.com, Richard Henderson , xen-devel@lists.xenproject.org, Reinoud Zandijk , "Michael S . Tsirkin" , Marcel Apfelbaum Subject: [PATCH 2/2] docs/about: Deprecate 32-bit arm hosts and qemu-system-arm Date: Mon, 27 Feb 2023 12:10:50 +0100 Message-Id: <20230227111050.54083-3-thuth@redhat.com> In-Reply-To: <20230227111050.54083-1-thuth@redhat.com> References: <20230227111050.54083-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 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. Additionally, it's quite unlikely that anybody is still running full system emulation on a 32-bit arm host nowadays. All recent strong arm host machines should support 64-bit now, so we also deprecate the 32-bit hosts here to finally save some precious minutes in our CI. Signed-off-by: Thomas Huth --- docs/about/deprecated.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 98517f5187..a52e45b570 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -208,6 +208,23 @@ QEMU will soon drop the support for 32-bit x86 host systems and the ``qemu-system-i386`` binary. Use ``qemu-system-x86_64`` (which is a proper superset of ``qemu-system-i386``) on a 64-bit host machine instead. +System emulation on 32-bit arm hosts and ``qemu-system-arm`` (since 8.0) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +``qemu-system-aarch64`` is a proper superset of ``qemu-system-arm``. The +latter was mainly a requirement for running KVM on 32-bit arm hosts, but +this 32-bit KVM support has been removed some years ago already (see: +https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=541ad0150ca4 +). Thus the QEMU project will drop the ``qemu-system-arm`` binary in a +future release -- use ``qemu-system-aarch64`` instead. + +Since you need a strong host machine for running full system emulation, +and all recent strong hosts support 64-bit anyway, the QEMU project +also deprecates the support for running any system emulation on 32-bit +arm hosts in general. Use 64-bit arm hosts for system emulation instead. +(Note: "user" mode emulation continuous to be supported on 32-bit arm +hosts, too) + QEMU API (QAPI) events ----------------------