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=-8.2 required=3.0 tests=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 49D2EC34026 for ; Tue, 18 Feb 2020 08:57:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1D9CB206E2 for ; Tue, 18 Feb 2020 08:57:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726339AbgBRI5j (ORCPT ); Tue, 18 Feb 2020 03:57:39 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:33384 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726225AbgBRI5j (ORCPT ); Tue, 18 Feb 2020 03:57:39 -0500 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 01I8oI8c180065 for ; Tue, 18 Feb 2020 03:57:38 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2y6cbab63k-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 18 Feb 2020 03:57:37 -0500 Received: from localhost by e06smtp04.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, 18 Feb 2020 08:57:32 -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 01I8vS7j14876872 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 18 Feb 2020 08:57:28 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B6BB64204D; Tue, 18 Feb 2020 08:57:28 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2A28742042; Tue, 18 Feb 2020 08:57:28 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.58.100]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 18 Feb 2020 08:57:28 +0000 (GMT) Subject: Re: [PATCH v2 25/42] KVM: s390: protvirt: disallow one_reg To: David Hildenbrand , Janosch Frank Cc: KVM , Cornelia Huck , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Janosch Frank References: <20200214222658.12946-1-borntraeger@de.ibm.com> <20200214222658.12946-26-borntraeger@de.ibm.com> <031b7db2-c255-e32d-782d-d4769dcb6ee8@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <031b7db2-c255-e32d-782d-d4769dcb6ee8@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20021808-0016-0000-0000-000002E7DEAF X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20021808-0017-0000-0000-0000334AF181 Message-Id: <9efa7a3f-bcf6-1775-e35b-05c9666b13b8@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-18_01:2020-02-17,2020-02-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 suspectscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 clxscore=1015 phishscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002180072 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 18.02.20 09:40, David Hildenbrand wrote: > On 14.02.20 23:26, Christian Borntraeger wrote: >> From: Janosch Frank > > "KVM: s390: protvirt: disallow KVM_GET_ONE_REG/KVM_SET_ONE_REG" > >> >> A lot of the registers are controlled by the Ultravisor and never >> visible to KVM. Some fields in the sie control block are overlayed, like >> gbea. As no known userspace uses the ONE_REG interface on s390 if sync >> regs are available, no functionality is lost if it is disabled for >> protected guests. >> >> Signed-off-by: Janosch Frank >> Reviewed-by: Thomas Huth >> Reviewed-by: Cornelia Huck >> [borntraeger@de.ibm.com: patch merging, splitting, fixing] >> Signed-off-by: Christian Borntraeger >> --- >> Documentation/virt/kvm/api.rst | 6 ++++-- >> arch/s390/kvm/kvm-s390.c | 3 +++ >> 2 files changed, 7 insertions(+), 2 deletions(-) >> >> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst >> index cb58714fe60d..a82166e5f7d9 100644 >> --- a/Documentation/virt/kvm/api.rst >> +++ b/Documentation/virt/kvm/api.rst >> @@ -2117,7 +2117,8 @@ Errors: >> >> ====== ============================================================ >>  ENOENT   no such register >> -  EINVAL   invalid register ID, or no such register >> +  EINVAL   invalid register ID, or no such register, ONE_REG forbidden >> + for protected guests (s390) > > "invalid register ID, no such register, or used with VMs in protected > virtualization mode on s390" ? ack. > >>  EPERM    (arm64) register access not allowed before vcpu finalization >> ====== ============================================================ >> >> @@ -2552,7 +2553,8 @@ Errors include: >> >> ======== ============================================================ >>  ENOENT   no such register >> -  EINVAL   invalid register ID, or no such register >> +  EINVAL   invalid register ID, or no such register, ONE_REG forbidden >> + for protected guests (s390) > > dito ack > >>  EPERM    (arm64) register access not allowed before vcpu finalization >> ======== ============================================================ >> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c >> index 8db82aaf1275..d20a7fa9d480 100644 >> --- a/arch/s390/kvm/kvm-s390.c >> +++ b/arch/s390/kvm/kvm-s390.c >> @@ -4638,6 +4638,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp, >> case KVM_SET_ONE_REG: >> case KVM_GET_ONE_REG: { >> struct kvm_one_reg reg; >> + r = -EINVAL; >> + if (kvm_s390_pv_is_protected(vcpu->kvm)) >> + break; > > I assume races will be dealt with in your next series. yes. This is running under vcpu_mutex and we will hold that lock when doing the gear shift. > >> r = -EFAULT; >> if (copy_from_user(®, argp, sizeof(reg))) >> break; >> > > With the two nits fixed > > Reviewed-by: David Hildenbrand >