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 C9FE5C4321D for ; Wed, 22 Aug 2018 16:55:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83A13208E3 for ; Wed, 22 Aug 2018 16:55:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83A13208E3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.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 S1727366AbeHVUV3 (ORCPT ); Wed, 22 Aug 2018 16:21:29 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:54786 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726842AbeHVUV3 (ORCPT ); Wed, 22 Aug 2018 16:21:29 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 393A94021CC1; Wed, 22 Aug 2018 16:55:49 +0000 (UTC) Received: from [10.36.116.89] (ovpn-116-89.ams2.redhat.com [10.36.116.89]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4D85110EE6D9; Wed, 22 Aug 2018 16:55:47 +0000 (UTC) Subject: Re: [PATCH v2 2/5] KVM: s390: vsie: Only accept FORMAT1 CRYCB for guest2 To: Pierre Morel 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, borntraeger@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com References: <1534956717-14087-1-git-send-email-pmorel@linux.ibm.com> <1534956717-14087-3-git-send-email-pmorel@linux.ibm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1534956717-14087-3-git-send-email-pmorel@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Wed, 22 Aug 2018 16:55:49 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Wed, 22 Aug 2018 16:55:49 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'david@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 22.08.2018 18:51, Pierre Morel wrote: > As the comment above the function suggested the shadowing > of the guest2 CRYCB can only accept a format 1 since > AP instructions are not supported in the guest. > > Let's modify the check which allowed to accept a format 2 too. As the bit is ignored without AP/APXA, it is perfectly valid to accept a format 2, we just have to interpret it as format 1 (which is what we do) What am I missing? > > Signed-off-by: Pierre Morel > --- > arch/s390/kvm/vsie.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index 12b9707..56a9d47 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -156,7 +156,9 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) > u8 ecb3_flags; > > scb_s->crycbd = 0; > - if (!(crycbd_o & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) > + if (!(crycbd_o == CRYCB_FORMAT1)) > + return 0; huh, this looks very broken. The address is still in there. > + if (!(vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) > return 0; > /* format-1 is supported with message-security-assist extension 3 */ > if (!test_kvm_facility(vcpu->kvm, 76)) > -- Thanks, David / dhildenb