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 lists1p.gnu.org (lists1p.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 3FB12C61DC2 for ; Thu, 27 Aug 2026 12:26:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wzZBU-00077h-Fa; Thu, 27 Aug 2026 08:26:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wzZBS-00076P-Fu for qemu-devel@nongnu.org; Thu, 27 Aug 2026 08:26:18 -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 1wzZBO-0003t6-UO for qemu-devel@nongnu.org; Thu, 27 Aug 2026 08:26:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1787833574; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Zkv3VOsmEi3W4EvqWCfKcDrMC80ZeCPkmQbK7/rUWSg=; b=TVJjgI/WtlWwHM6beQrCAJ5pvcxu4Y5rWFeewtN3W5jerAmvLqKTaLPWu3lLdphMAseKY0 wwGrkvVXsALiSJAdn7eb5gR+RXY98yD+frNlHJWXcCuWZgoG9x4GrwLNM2IWjPOpNsfBYX 0zcI1OEJa29B3wz07rwq3MkfndTeSQw= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-361-L3oEfgQlO5qAnQpqgc_cUQ-1; Thu, 27 Aug 2026 08:26:10 -0400 X-MC-Unique: L3oEfgQlO5qAnQpqgc_cUQ-1 X-Mimecast-MFC-AGG-ID: L3oEfgQlO5qAnQpqgc_cUQ_1787833565 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 11E6D1953987; Thu, 27 Aug 2026 12:26:03 +0000 (UTC) Received: from redhat.com (headnet05.pony-001.prod.iad2.dc.redhat.com [10.2.32.117]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 213A71955F70; Thu, 27 Aug 2026 12:25:51 +0000 (UTC) Date: Thu, 27 Aug 2026 13:25:49 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Yonggang Luo , qemu-devel@nongnu.org, Xianglai Li , Alistair Francis , Chinmay Rath , Sunil V L , qemu-riscv@nongnu.org, Alexander Bulekov , Zhao Liu , Eric Farman , Laurent Vivier , Peter Maydell , Chao Liu , Liu Zhiwei , Palmer Dabbelt , Song Gao <17746591750@163.com>, Harsh Prateek Bora , Glenn Miles , Daniel Henrique Barboza , Pierrick Bouvier , qemu-s390x@nongnu.org, Jiaxun Yang , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , "Michael S. Tsirkin" , Stefan Hajnoczi , Alex =?utf-8?Q?Benn=C3=A9e?= , David Hildenbrand , qemu-ppc@nongnu.org, qemu-arm@nongnu.org, Igor Mammedov , Aleksandar Rikalo , Nicholas Piggin , Cornelia Huck , Richard Henderson , Ilya Leoshkevich , Fabiano Rosas , Aurelien Jarno , Paolo Bonzini , Ani Sinha , Bibo Mao , =?utf-8?Q?Marc-Andr=C3=A9?= Lureau , Matthew Rosato , Weiwei Li , Darren Kenny Subject: Re: [PATCH 10/12] target-info: add -target and program-name selection Message-ID: References: <20260823150731.896-1-luoyonggang@gmail.com> <20260823150731.896-11-luoyonggang@gmail.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/2.4.0 (2026-06-19) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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, RCVD_IN_SBL_CSS=3.335, 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 Wed, Aug 26, 2026 at 01:46:17PM +0100, Daniel P. Berrangé wrote: > On Sun, Aug 23, 2026 at 11:07:28PM +0800, Yonggang Luo wrote: > > - Parse -target before TargetInfo is fixed; CLI overrides the program > > basename. > > - Tokens are target_name or target_name-be / -le; -target help lists > > registered names in sorted order. > > - When -target is omitted, infer the token from g_get_prgname(): strip > > .exe, take the longest dash-separated registered suffix, and retry > > without a trailing w for Windows GUI binaries. > > - A basename that matches no registered token falls through to the > > unique default. Combined binaries with no suffix require -target > > when more than one default TargetInfo is registered. > > IMHO this -target argument and the target interference from > program name is a mistaken direction. We're being led off > course by the attempt to make the new qemu-system be identical > to qemu-system-$TARGET. > > If we ignore historical compat and treat qemu-system as a > clean break, then I'd suggest that 'target' is not a concept > to be exposed to the user at all. > > The user cares about the machine (and CPUs) they want to run, > and their choice in this respect is what should determine the > target(s) QEMU needs to enable. We should take > > qemu-system --machine vexpress-a15 > > that tells us we need the arm target. If we need to distinguish > arm7 vs aarch64, then the choice of -cpu should determine 32 > bs 64 bit. > > This extends better into the future world where we have > machine type that could involve CPUs from multiple targets. > > IOW machine config option / QOM class is what we should pivot > off rather than a global target config option. I forgot to mention that this is also pretty important for making introspection work, as we need to be able to say 'qemu-system --machine none -qmp ...' and connect to QMP to introspect the binary. Having to add a '--target ' into that mix is undesirable, as it creates a chicken & egg problem. You don't know what targets are built into qemu-system without introspecting it and you can't introspect it without selecting a target to introspect. 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 :|