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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 7C6CFC35247 for ; Wed, 5 Feb 2020 18:29:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4172C20674 for ; Wed, 5 Feb 2020 18:29:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727192AbgBES3T (ORCPT ); Wed, 5 Feb 2020 13:29:19 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:58724 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727081AbgBES3T (ORCPT ); Wed, 5 Feb 2020 13:29:19 -0500 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 015IOMa7007670 for ; Wed, 5 Feb 2020 13:29:18 -0500 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xyhmn9q9x-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 05 Feb 2020 13:29:17 -0500 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) Wed, 5 Feb 2020 18:29:12 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 015ITBFk22216850 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 5 Feb 2020 18:29:11 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 66C33A404D; Wed, 5 Feb 2020 18:29:11 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E4BAFA4040; Wed, 5 Feb 2020 18:29:10 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.26.20]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 5 Feb 2020 18:29:10 +0000 (GMT) Subject: Re: [RFCv2 11/37] KVM: s390/mm: Make pages accessible before destroying the guest To: Cornelia Huck Cc: Janosch Frank , KVM , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , Andrea Arcangeli References: <20200203131957.383915-1-borntraeger@de.ibm.com> <20200203131957.383915-12-borntraeger@de.ibm.com> <20200205113520.1a90f3d1.cohuck@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20200205113520.1a90f3d1.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20020518-0008-0000-0000-000003500896 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20020518-0009-0000-0000-00004A709A15 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-05_06:2020-02-04,2020-02-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=478 impostorscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 clxscore=1015 malwarescore=0 suspectscore=0 phishscore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002050140 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 05.02.20 11:35, Cornelia Huck wrote: > On Mon, 3 Feb 2020 08:19:31 -0500 > Christian Borntraeger wrote: > >> Before we destroy the secure configuration, we better make all >> pages accessible again. This also happens during reboot, where we reboot >> into a non-secure guest that then can go again into a secure mode. As > > s/a secure/secure/ ack > >> this "new" secure guest will have a new ID we cannot reuse the old page >> state. >> >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/include/asm/pgtable.h | 1 + >> arch/s390/kvm/pv.c | 2 ++ >> arch/s390/mm/gmap.c | 35 +++++++++++++++++++++++++++++++++ >> 3 files changed, 38 insertions(+) > > (...) > >> +void s390_reset_acc(struct mm_struct *mm) >> +{ >> + /* >> + * we might be called during >> + * reset: we walk the pages and clear >> + * close of all kvm file descriptor: we walk the pages and clear > > s/descriptor/descriptors/ ack > >> + * exit of process on fd closure: vma already gone, do nothing >> + */ >> + if (!mmget_not_zero(mm)) >> + return; >> + down_read(&mm->mmap_sem); >> + walk_page_range(mm, 0, TASK_SIZE, &reset_acc_walk_ops, NULL); >> + up_read(&mm->mmap_sem); >> + mmput(mm); >> +} >> +EXPORT_SYMBOL_GPL(s390_reset_acc); > > Reviewed-by: Cornelia Huck >