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=-8.3 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 B63ABC35247 for ; Wed, 5 Feb 2020 19:26:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 88E32217F4 for ; Wed, 5 Feb 2020 19:26:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727199AbgBET0I (ORCPT ); Wed, 5 Feb 2020 14:26:08 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:32546 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727085AbgBET0I (ORCPT ); Wed, 5 Feb 2020 14:26:08 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 015JJuV5062867 for ; Wed, 5 Feb 2020 14:26:06 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2xyhmh2ged-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 05 Feb 2020 14:26:06 -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) Wed, 5 Feb 2020 19:26:01 -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 015JQ0Wa58261694 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 5 Feb 2020 19:26:00 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2BF16A4053; Wed, 5 Feb 2020 19:26:00 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AAEE1A404D; Wed, 5 Feb 2020 19:25:59 +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 19:25:59 +0000 (GMT) Subject: Re: [RFCv2 26/37] KVM: s390: protvirt: disallow one_reg 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> <20200203131957.383915-27-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: 8bit X-TM-AS-GCONF: 00 x-cbid: 20020519-0012-0000-0000-00000384057F X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20020519-0013-0000-0000-000021C07101 Message-Id: <15e9a8aa-ddbc-afb8-14e5-ca5556379ff4@de.ibm.com> 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 malwarescore=0 suspectscore=0 spamscore=0 impostorscore=0 mlxlogscore=703 adultscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 mlxscore=0 clxscore=1015 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002050148 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 05.02.20 13:16, Thomas Huth wrote: > On 03/02/2020 14.19, Christian Borntraeger wrote: >> From: Janosch Frank >> >> 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 userspace uses the ONE_REG interface on s390 it is safe >> to disable this for protected guests. >> >> Signed-off-by: Janosch Frank >> --- >> arch/s390/kvm/kvm-s390.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c >> index 6e74c7afae3a..b9692d722c1e 100644 >> --- a/arch/s390/kvm/kvm-s390.c >> +++ b/arch/s390/kvm/kvm-s390.c >> @@ -4641,6 +4641,9 @@ 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; >> r = -EFAULT; >> if (copy_from_user(®, argp, sizeof(reg))) >> break; > > Reviewed-by: Thomas Huth > > PS: > Not sure, but maybe it would be also be good to add a sentence to > Documentation/virt/kvm/api.txt ? Ack: diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt index 4874d42286ca..8239b3665736 100644 --- a/Documentation/virt/kvm/api.txt +++ b/Documentation/virt/kvm/api.txt @@ -1918,7 +1918,8 @@ Parameters: struct kvm_one_reg (in) Returns: 0 on success, negative value on failure 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).  EPERM:    (arm64) register access not allowed before vcpu finalization (These error codes are indicative only: do not rely on a specific error code being returned in a specific situation.) @@ -2311,7 +2312,8 @@ Parameters: struct kvm_one_reg (in and out) Returns: 0 on success, negative value on failure 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)  EPERM:    (arm64) register access not allowed before vcpu finalization (These error codes are indicative only: do not rely on a specific error code being returned in a specific situation.)