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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 D7B55C4321D for ; Thu, 23 Aug 2018 11:17:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E59A2154C for ; Thu, 23 Aug 2018 11:17:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E59A2154C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=de.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731302AbeHWOrJ (ORCPT ); Thu, 23 Aug 2018 10:47:09 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:49550 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728620AbeHWOrJ (ORCPT ); Thu, 23 Aug 2018 10:47:09 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7NBE9JS170432 for ; Thu, 23 Aug 2018 07:17:54 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0b-001b2d01.pphosted.com with ESMTP id 2m1uf118vh-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 23 Aug 2018 07:17:54 -0400 Received: from localhost by e06smtp01.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) Thu, 23 Aug 2018 12:17:49 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7NBHmxR34734118 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Aug 2018 11:17:48 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8ADCE52052; Thu, 23 Aug 2018 14:17:47 +0100 (BST) Received: from oc7330422307.ibm.com (unknown [9.152.224.87]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 2960D5204F; Thu, 23 Aug 2018 14:17:47 +0100 (BST) Subject: Re: [PATCH v3 2/3] KVM: s390: vsie: Do the CRYCB validation first To: Pierre Morel , david@redhat.com Cc: linux-kernel@vger.kernel.org, cohuck@redhat.com, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@linux.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com References: <1535019956-23539-1-git-send-email-pmorel@linux.ibm.com> <1535019956-23539-3-git-send-email-pmorel@linux.ibm.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1535019956-23539-3-git-send-email-pmorel@linux.ibm.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18082311-4275-0000-0000-000002AE1F0D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082311-4276-0000-0000-000037B727CF Message-Id: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-23_05:,, 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=8.0.1-1807170000 definitions=main-1808230121 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/23/2018 12:25 PM, Pierre Morel wrote: > When entering the SIE the CRYCB validation better > be done independently of the instruction's > availability. Maybe something like We need to handle the validity checks for the crycb, no matter what the settings for the keywrappings are. So lets move the keywrapping checks after we have done the validy checks. ? > > Signed-off-by: Pierre Morel > --- > arch/s390/kvm/vsie.c | 11 ++++++----- > 1 file changed, 6 insertions(+), 5 deletions(-) > > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index 12b9707..38ea5da 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -161,17 +161,18 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) > /* format-1 is supported with message-security-assist extension 3 */ > if (!test_kvm_facility(vcpu->kvm, 76)) > return 0; > - /* we may only allow it if enabled for guest 2 */ > - ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & > - (ECB3_AES | ECB3_DEA); > - if (!ecb3_flags) > - return 0; > > if ((crycb_addr & PAGE_MASK) != ((crycb_addr + 128) & PAGE_MASK)) > return set_validity_icpt(scb_s, 0x003CU); > else if (!crycb_addr) > return set_validity_icpt(scb_s, 0x0039U); > > + /* we may only allow it if enabled for guest 2 */ > + ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & > + (ECB3_AES | ECB3_DEA); > + if (!ecb3_flags) > + return 0; > + > /* copy only the wrapping keys */ > if (read_guest_real(vcpu, crycb_addr + 72, > vsie_page->crycb.dea_wrapping_key_mask, 56)) >