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 CE54DC2D0B1 for ; Tue, 4 Feb 2020 12:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A175D21744 for ; Tue, 4 Feb 2020 12:03:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727228AbgBDMDk (ORCPT ); Tue, 4 Feb 2020 07:03:40 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:24222 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727119AbgBDMDk (ORCPT ); Tue, 4 Feb 2020 07:03:40 -0500 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 014C2hJ2042004 for ; Tue, 4 Feb 2020 07:03:39 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2xx93747ah-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 04 Feb 2020 07:03:38 -0500 Received: from localhost by e06smtp03.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, 4 Feb 2020 12:03:34 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 014C3X4k52953334 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 4 Feb 2020 12:03:33 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 137F64C050; Tue, 4 Feb 2020 12:03:33 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C74164C052; Tue, 4 Feb 2020 12:03:32 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.61]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 4 Feb 2020 12:03:32 +0000 (GMT) Subject: Re: [RFCv2 06/37] s390: add (non)secure page access exceptions handlers To: Thomas Huth , Janosch Frank Cc: KVM , Cornelia Huck , David Hildenbrand , Ulrich Weigand , Claudio Imbrenda , Andrea Arcangeli References: <20200203131957.383915-1-borntraeger@de.ibm.com> <20200203131957.383915-7-borntraeger@de.ibm.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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20020412-0012-0000-0000-000003839057 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20020412-0013-0000-0000-000021BFF71E Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-04_03:2020-02-04,2020-02-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=911 mlxscore=0 malwarescore=0 clxscore=1015 adultscore=0 bulkscore=0 phishscore=0 spamscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2002040083 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 04.02.20 11:37, Thomas Huth wrote: > On 03/02/2020 14.19, Christian Borntraeger wrote: >> From: Vasily Gorbik >> >> Add exceptions handlers performing transparent transition of non-secure >> pages to secure (import) upon guest access and secure pages to >> non-secure (export) upon hypervisor access. >> >> Signed-off-by: Vasily Gorbik >> Signed-off-by: Janosch Frank >> [adding checks for failures] >> Signed-off-by: Claudio Imbrenda >> [further changes like adding a check for gmap fault] > > Who did which modification here? According to > Documentation/process/submitting-patches.rst the square brackets should > go in front of the S-o-b of the person who did the change, e.g.: > > Signed-off-by: Random J Developer > [lucky@maintainer.example.org: struct foo moved from foo.c to foo.h] > Signed-off-by: Lucky K Maintainer > > It would be nice if you could stick to that scheme. will fix > >> --- >> arch/s390/kernel/pgm_check.S | 4 +- >> arch/s390/mm/fault.c | 87 ++++++++++++++++++++++++++++++++++++ >> 2 files changed, 89 insertions(+), 2 deletions(-) > [...] >> +void do_non_secure_storage_access(struct pt_regs *regs) >> +{ >> + unsigned long gaddr = regs->int_parm_long & __FAIL_ADDR_MASK; >> + struct gmap *gmap = (struct gmap *)S390_lowcore.gmap; >> + struct uv_cb_cts uvcb = { >> + .header.cmd = UVC_CMD_CONV_TO_SEC_STOR, >> + .header.len = sizeof(uvcb), >> + .guest_handle = gmap->se_handle, >> + .gaddr = gaddr, >> + }; >> + int rc; >> + >> + if (get_fault_type(regs) != GMAP_FAULT) { >> + do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP); >> + WARN_ON_ONCE(1); >> + return; >> + } >> + >> + rc = uv_make_secure(gmap, gaddr, &uvcb, 0); >> + if (rc == -EINVAL && uvcb.header.rc != 0x104) >> + send_sig(SIGSEGV, current, 0); >> +} > > What about the other rc beside 0x104 that could happen here? They go > unnoticed? > > Thomas >