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 BC32E109318E for ; Fri, 20 Mar 2026 08:55:41 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w3VdE-0003MB-DN; Fri, 20 Mar 2026 04:55:00 -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 1w3VdC-0003Lt-Dl for qemu-devel@nongnu.org; Fri, 20 Mar 2026 04:54:58 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w3Vd9-0001Tj-Ev for qemu-devel@nongnu.org; Fri, 20 Mar 2026 04:54:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1773996893; 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=igIg84ihIrwBcafUy0gr3URY7yCRsQi0aXdQlqRC/54=; b=aHJR2Q2Hj9a8ZMikKbRLOGf2++Pk6V2wpjCzaEHirmCRPeqXhAmBo+A2Rw5VbWK6HYBHZp HsnxWAEKXIp2DfCDUcWIsQoXvv7cXS9CNZ3UX90Q2gvZVPLOoIWHhZJEexFTmDM3gaqKda MI0qvNM2BLIaUmt4j0CF/TtsJ3O5H6E= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-687-MXsFAsWENIy97m_QN-1iXg-1; Fri, 20 Mar 2026 04:54:51 -0400 X-MC-Unique: MXsFAsWENIy97m_QN-1iXg-1 X-Mimecast-MFC-AGG-ID: MXsFAsWENIy97m_QN-1iXg_1773996890 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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 mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 9696818002CD; Fri, 20 Mar 2026 08:54:49 +0000 (UTC) Received: from redhat.com (unknown [10.44.33.255]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 57DA030002DF; Fri, 20 Mar 2026 08:54:47 +0000 (UTC) Date: Fri, 20 Mar 2026 08:54:44 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Michael Tokarev Cc: QEMU Development Subject: Re: QEMU requires a 64-bit CPU host architecture? Message-ID: References: <2c0d6ae0-eb06-4eed-87fe-0954ae59d951@tls.msk.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <2c0d6ae0-eb06-4eed-87fe-0954ae59d951@tls.msk.ru> User-Agent: Mutt/2.2.14 (2025-02-20) X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, 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-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 20, 2026 at 09:45:20AM +0300, Michael Tokarev wrote: > Hi! > > Is it intentional that qemu does not build utilities on 32bit hosts > anymore? Yes, per this note: https://www.qemu.org/docs/master/about/removed-features.html#bit-host-operating-systems-removed-in-11-0 > I understand system/user emulation on a 32bit host, where there are > quite some real difficulties with address space sizes. > > But what's wrong with building qemu-img et al on a 32bit host? It > doesn't require 64bit address space.. While the acclerator burden was one big factor, there were other code removals enabled by dropping 32-bit hosts, such as removal of 64-bit atomics emulation, and removal of some back compat definitions for 32-bit kernels, and simplifying assumptions about CPU features in other code, all of which leak out into common code used by qemu-img & similar tools. Keeping an arbitrary, and continually changing, subset of QEMU supporting 32-bit while most code dropped 64-bit would not be fun situation for maintainers, even with CI to try to detect problems. 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 :|