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 A70B8C54EAA for ; Mon, 30 Jan 2023 12:03:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pMSsA-0001GN-9q; Mon, 30 Jan 2023 07:02:56 -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 1pMSrQ-0001Dn-7b for qemu-devel@nongnu.org; Mon, 30 Jan 2023 07:02:13 -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 1pMSrH-0006ZG-5s for qemu-devel@nongnu.org; Mon, 30 Jan 2023 07:02:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675080117; 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=twv/PXzL68DGQDF/MtK4QtOC+sukESA0OgGkJvEh5RM=; b=aHJ/EyuyJbE4K0iYFeFVOLCJxvc79GctkWlAL2caBR/GD66//Mv+Rtf1xdmCOfeQCxh1nI N62whO+Hg8Jt1SluagwGlJ68R4yYnZeUgKNfNsOiSpgKZi/xHog7nFrT3MxDhbG+VZWBNg 8aM2cGh3wHiakbYMCXvEggua3P/S4lM= 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-486-NWTMbyjfMtGyWxjI0WH8aA-1; Mon, 30 Jan 2023 07:01:54 -0500 X-MC-Unique: NWTMbyjfMtGyWxjI0WH8aA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A83C53806636; Mon, 30 Jan 2023 12:01:53 +0000 (UTC) Received: from redhat.com (unknown [10.33.36.49]) by smtp.corp.redhat.com (Postfix) with ESMTPS id F1C38492B05; Mon, 30 Jan 2023 12:01:50 +0000 (UTC) Date: Mon, 30 Jan 2023 12:01:48 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Peter Maydell Cc: Thomas Huth , qemu-devel@nongnu.org, Stefan Hajnoczi , Richard Henderson , libvir-list@redhat.com, Paolo Bonzini , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Reinoud Zandijk , Ryo ONODERA , Brad Smith , Stefan Weil Subject: Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems Message-ID: References: <20230130114428.1297295-1-thuth@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.9 (2022-11-12) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=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: 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 Mon, Jan 30, 2023 at 11:47:02AM +0000, Peter Maydell wrote: > On Mon, 30 Jan 2023 at 11:44, Thomas Huth wrote: > > > > Testing 32-bit host OS support takes a lot of precious time during the QEMU > > contiguous integration tests, and considering that many OS vendors stopped > > shipping 32-bit variants of their OS distributions and most hardware from > > the past >10 years is capable of 64-bit > > True for x86, not necessarily true for other architectures. > Are you proposing to deprecate x86 32-bit, or all 32-bit? > I'm not entirely sure about whether we're yet at a point where > I'd want to deprecate-and-drop 32-bit arm host support. Do we have a feeling on which aspects of 32-bit cause us the support burden ? The boring stuff like compiler errors from mismatched integer sizes is mostly quick & easy to detect simply through a cross compile. I vaguely recall someone mentioned problems with atomic ops in the past, or was it 128-bit ints, caused implications for the codebase ? 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 :|