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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no 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 76F2FC33CA9 for ; Mon, 13 Jan 2020 15:24:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 53646207FD for ; Mon, 13 Jan 2020 15:24:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729031AbgAMPYt (ORCPT ); Mon, 13 Jan 2020 10:24:49 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44032 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728558AbgAMPYt (ORCPT ); Mon, 13 Jan 2020 10:24:49 -0500 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00DFIIRX001621 for ; Mon, 13 Jan 2020 10:24:48 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xfvqm909u-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 13 Jan 2020 10:24:47 -0500 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 13 Jan 2020 15:24:43 -0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00DFOf8T37290086 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 Jan 2020 15:24:41 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7E1E042049; Mon, 13 Jan 2020 15:24:41 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A75B4205E; Mon, 13 Jan 2020 15:24:41 +0000 (GMT) Received: from p-imbrenda (unknown [9.152.224.108]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 13 Jan 2020 15:24:41 +0000 (GMT) Date: Mon, 13 Jan 2020 16:24:39 +0100 From: Claudio Imbrenda To: David Hildenbrand Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, thuth@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com Subject: Re: [kvm-unit-tests PATCH v7 4/4] s390x: SCLP unit test In-Reply-To: <3db7eaf7-6020-365b-c849-9961e483352e@redhat.com> References: <20200110184050.191506-1-imbrenda@linux.ibm.com> <20200110184050.191506-5-imbrenda@linux.ibm.com> <8d7fb5c4-9e2c-e28a-16c0-658afcc8178d@redhat.com> <20200113133325.417bf657@p-imbrenda> <1b86b00a-261e-3d8c-fa52-c30e67463ad5@redhat.com> <20200113135832.1c6d3bb8@p-imbrenda> <22b5ce6a-18af-edec-efc6-e03450faddf8@redhat.com> <20200113150504.3fd218d5@p-imbrenda> <3db7eaf7-6020-365b-c849-9961e483352e@redhat.com> Organization: IBM X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20011315-4275-0000-0000-000003972CDF X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20011315-4276-0000-0000-000038AB234B Message-Id: <20200113162439.7ae81f84@p-imbrenda> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-13_04:2020-01-13,2020-01-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 priorityscore=1501 adultscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 mlxlogscore=819 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001130125 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Archived-At: List-Archive: List-Post: On Mon, 13 Jan 2020 15:43:28 +0100 David Hildenbrand wrote: > On 13.01.20 15:05, Claudio Imbrenda wrote: > > On Mon, 13 Jan 2020 14:10:10 +0100 > > David Hildenbrand wrote: > > > > [...] > > > >> :) I'm confused by the fact that you "expect_pgm_int()" but > >> actually don't expect one ... > >> > >> Please enlighten me why this isn't > >> > >> + sclp_mark_busy(); > >> + h->length = 8; > >> + sclp_setup_int(); > >> + > >> + asm volatile( > >> + " .insn rre,0xb2204200,%1,%2\n" /* servc > >> %1,%2 */ > >> + " ipm %0\n" > >> + " srl %0,28" > >> + : "=&d" (cc) : "d" (valid_code), "a" > >> (__pa(pagebuf)) > >> + : "cc", "memory"); > >> + if (!cc) > >> + sclp_wait_busy(); > >> + report(cc == 0, "Instruction format ignored bits"); > >> > >> I feel like I am missing something important. > > > > because if we take an unexpected pgm interrupt: > > * the interrupt handler will write stuff on the console using SCLP > > * it will wait for the busy flag to be cleared before doing so > > * thus it will hang. > > > > this would be solved by adding special logic to the pgm interrupt > > handler (as we have discussed in your previous email) > > > > I see, so the issue should hold for all SCLP checks where we don't > expect an exception ... hmmm which is why my wrapper in the unit test is so complicated :)