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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 5D7C6C0650F for ; Tue, 30 Jul 2019 18:04:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3517D206A2 for ; Tue, 30 Jul 2019 18:04:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387816AbfG3SEO (ORCPT ); Tue, 30 Jul 2019 14:04:14 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:15928 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729978AbfG3SEN (ORCPT ); Tue, 30 Jul 2019 14:04:13 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6UI2wC0099805 for ; Tue, 30 Jul 2019 14:04:11 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0b-001b2d01.pphosted.com with ESMTP id 2u2tamh7p9-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 30 Jul 2019 14:04:11 -0400 Received: from localhost by e06smtp02.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) Tue, 30 Jul 2019 19:04:04 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6UI43V029360352 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 30 Jul 2019 18:04:04 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C01ED4C052; Tue, 30 Jul 2019 18:04:03 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 616CE4C040; Tue, 30 Jul 2019 18:04:02 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.144.206]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 30 Jul 2019 18:04:02 +0000 (GMT) Subject: Re: [PATCH 2/2] KVM: selftests: Enable dirty_log_test on s390x To: Thomas Huth , kvm@vger.kernel.org, Janosch Frank Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, David Hildenbrand , Cornelia Huck , Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Shuah Khan , Peter Xu References: <20190730100112.18205-1-thuth@redhat.com> <20190730100112.18205-3-thuth@redhat.com> <02c5c7b4-c45e-4573-d2c3-ebfa2cd2c9d1@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <02c5c7b4-c45e-4573-d2c3-ebfa2cd2c9d1@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19073018-0008-0000-0000-000003024C05 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19073018-0009-0000-0000-0000226FEEC7 Message-Id: <341c3705-c2cb-9e87-cc03-42e0cefba308@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-30_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907300188 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30.07.19 19:11, Thomas Huth wrote: > On 30/07/2019 16.57, Christian Borntraeger wrote: >> >> >> On 30.07.19 12:01, Thomas Huth wrote: >>> To run the dirty_log_test on s390x, we have to make sure that we >>> access the dirty log bitmap with little endian byte ordering and >>> we have to properly align the memslot of the guest. >>> Also all dirty bits of a segment are set once on s390x when one >>> of the pages of a segment are written to for the first time, so >>> we have to make sure that we touch all pages during the first >>> iteration to keep the test in sync here. >> >> While this fixes the test (and the migration does work fine), it still >> means that s390x overindicates the dirty bit for sparsely populated >> 1M segments. It is just a performance issue, but maybe we should try >> to get this fixed. > > I hope you don't expect me to fix this - the gmap code is really not my > turf... No, this is clearly on our turf. > >> Not sure what to do here to remember us about this, >> adding this as expected fail? > > There is no such thing like an expected failure in KVM selftests - > that's only available in kvm-unit-tests. > > So the only option that I currently see is to add a printf("TODO: ...") > on s390x here... would that work for you? Maybe just keep this as is - we should just not forget about it.