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spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:40338 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lZr64-0004gc-Vo for qemu-devel@archiver.kernel.org; Fri, 23 Apr 2021 04:23:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54428) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lZr5C-0004Br-Vq for qemu-devel@nongnu.org; Fri, 23 Apr 2021 04:22:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:58768) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lZr5B-0002XH-IG for qemu-devel@nongnu.org; Fri, 23 Apr 2021 04:22:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619166156; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ggTQprbA0b3ijcO+Jk0laBwyTy3wsRkBgRKGOyalbAM=; b=UIHb8Cxprh1z5NhpEPc3BcuyX/sp8KM4Wdpuz+bk3hj9WAj4NmB6xPYZRbdf6VM44aWQTP I6tGOl2JlsjDKE/A/HfS1Z2ZcOJRrNP57oiQdFz+a6XNAAnLtIqECG1KvUmPQy+hVBTVLY b4QEUL7ec9vx03TFdBFbBQpxRk6coKI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-564-wIw_Fk3nNXqWKtg5uoCxwQ-1; Fri, 23 Apr 2021 04:22:33 -0400 X-MC-Unique: wIw_Fk3nNXqWKtg5uoCxwQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 21EA5107ACED; Fri, 23 Apr 2021 08:22:32 +0000 (UTC) Received: from thuth.remote.csb (ovpn-112-74.ams2.redhat.com [10.36.112.74]) by smtp.corp.redhat.com (Postfix) with ESMTP id E23F71045D02; Fri, 23 Apr 2021 08:22:29 +0000 (UTC) To: Cornelia Huck References: <089df242-8788-a162-4a75-4c9c9e04a64e@redhat.com> <8afd0f34-7e75-2661-9ea5-3ebadff3b85d@redhat.com> <2ec6e995-6833-1ebd-03c8-a3fede7fddb8@de.ibm.com> <20210422155238.kak7tl3xnup5vod7@steredhat> <20210423064001.fjouibdcwadtgijy@steredhat> <8abfb851-a5d2-8608-fe96-2eb3014adb96@redhat.com> <20210423100708.262eeaf0.cohuck@redhat.com> From: Thomas Huth Subject: Re: Compiling the s390-ccw bios with clang (was: Re: s390-ccw: warning: writing 1 byte into a region of size 0) Message-ID: <856dfa3f-e7ee-b88e-47e4-96d39dba20c3@redhat.com> Date: Fri, 23 Apr 2021 10:22:28 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: <20210423100708.262eeaf0.cohuck@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , Janosch Frank , Richard Henderson , qemu-devel , Christian Borntraeger , qemu-s390x , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 23/04/2021 10.07, Cornelia Huck wrote: > On Fri, 23 Apr 2021 09:57:08 +0200 > Thomas Huth wrote: > >> On 23/04/2021 08.52, Christian Borntraeger wrote: >> [...] >>> We can of course discuss if we compile the BIOS for z10 instead of z900. TCG >>> in the mean time can handle up to z13 and z10 is now also 13 years old. >> >> I'd really like to see us supporting Clang in the s390-ccw bios, too, since >> it provides additional useful compiler warnings ... but switching the -mz900 >> to -mz10 here also means that we could not boot VMs anymore that use a CPU >> that is older than the z10... > > We could still boot a kernel/initrd directly, couldn't we? Yes, but that will certainly require some documentation effort to make it clear to the users that they need to use "-kernel" in case they want to run an older guest... >> Is anybody still using such old CPUs? Should we maybe deprecate all CPUs >> that are older than the z10 in QEMU? Alternatively, we could try to detect >> Clang in the Makefile, and only use -mz10 in that case and continue to use >> -mz900 in the other case...? > > So, the issue with clang is that it compiles to at least a z10, right? Right, Clang does not support anything that is older than a z10. > Any other issues we know about? There are some compiler warnings, and at least network booting seems to be broken... that certainly needs some investigation first... Thomas