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 X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53390C433E0 for ; Thu, 25 Jun 2020 10:58:23 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 20F9B2076E for ; Thu, 25 Jun 2020 10:58:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LWzVJofr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 20F9B2076E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44376 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1joPaI-00072s-E3 for qemu-devel@archiver.kernel.org; Thu, 25 Jun 2020 06:58:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44610) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1joPZK-0006IC-KM for qemu-devel@nongnu.org; Thu, 25 Jun 2020 06:57:23 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:34121 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1joPZH-0004mB-Jr for qemu-devel@nongnu.org; Thu, 25 Jun 2020 06:57:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593082638; 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=9LOuAAvMFJTIqju4tZJuvxvrDYRtU6gvUd+SO24yG6s=; b=LWzVJofrCJDWBWcAtG0rBVwGDPL6jBrXCsJrqde9AKgcEZyFFbNA0m0Ia+ShlLxRSsaaDb 6eyVmqHeSNYy206izkEsXVVirKRgmJB4qAsHyzkNeelH41dJHAVyg8UXaGdVitC2C8hXMQ vPnLsAlWMy3FnQ9wGhr082aIpvMa5aE= 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-78-hwmQ6aAENveFcuIHnVDkpg-1; Thu, 25 Jun 2020 06:57:16 -0400 X-MC-Unique: hwmQ6aAENveFcuIHnVDkpg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C3D9B804002; Thu, 25 Jun 2020 10:57:15 +0000 (UTC) Received: from thuth.remote.csb (ovpn-112-150.ams2.redhat.com [10.36.112.150]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 96A3B5D9C5; Thu, 25 Jun 2020 10:57:08 +0000 (UTC) Subject: Re: [PATCH v5 05/12] pc-bios: s390x: Remove unneeded dasd-ipl.c reset psw mask changes To: Janosch Frank , qemu-devel@nongnu.org References: <20200624075226.92728-1-frankja@linux.ibm.com> <20200624075226.92728-6-frankja@linux.ibm.com> From: Thomas Huth Message-ID: <95c7fe36-02fe-d430-5ae7-04e3ce38e3fb@redhat.com> Date: Thu, 25 Jun 2020 12:57:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200624075226.92728-6-frankja@linux.ibm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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-Transfer-Encoding: 7bit Received-SPF: pass client-ip=205.139.110.61; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 00:45:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: "Jason J . Herne" , borntraeger@de.ibm.com, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 24/06/2020 09.52, Janosch Frank wrote: > jump_to_low_kernel() and the functions that it calls will already or > 64 bit addressing into the reset psw mask when executing > jump_to_IPL_2() after the diag308 subcode 1. Hmm, the jump_to_IPL_code() also sets the 64-bit addressing bits ... but jump_to_low_kernel() has some logic that tests for the bits before that function is called: /* Trying to get PSW at zero address */ if (*((uint64_t *)0) & RESET_PSW_MASK) { jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff); } Could it be that the code in dasd-ipl.c has been written with that if-statement in mind? Thomas > The kernel proper is then branched to rather than doing a full PSW > change. > > Signed-off-by: Janosch Frank > --- > pc-bios/s390-ccw/dasd-ipl.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c > index 0fc879bb8e..e8f2846740 100644 > --- a/pc-bios/s390-ccw/dasd-ipl.c > +++ b/pc-bios/s390-ccw/dasd-ipl.c > @@ -206,7 +206,6 @@ static void run_ipl2(SubChannelId schid, uint16_t cutype, uint32_t addr) > */ > void dasd_ipl(SubChannelId schid, uint16_t cutype) > { > - PSWLegacy *pswl = (PSWLegacy *) 0x00; > uint32_t ipl2_addr; > > /* Construct Read IPL CCW and run it to read IPL1 from boot disk */ > @@ -229,7 +228,5 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype) > run_ipl2(schid, cutype, ipl2_addr); > > /* Transfer control to the guest operating system */ > - pswl->mask |= PSW_MASK_EAMODE; /* Force z-mode */ > - pswl->addr |= PSW_MASK_BAMODE; /* ... */ > jump_to_low_kernel(); > } >