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 CB07DC43381 for ; Thu, 28 Feb 2019 11:03:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 956A3218AE for ; Thu, 28 Feb 2019 11:03:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731850AbfB1LDt (ORCPT ); Thu, 28 Feb 2019 06:03:49 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40328 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731068AbfB1LDs (ORCPT ); Thu, 28 Feb 2019 06:03:48 -0500 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1SB2RYc105810 for ; Thu, 28 Feb 2019 06:03:46 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2qxe7s0m3t-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 28 Feb 2019 06:03:46 -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) Thu, 28 Feb 2019 11:03:40 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x1SB3dRA25362656 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 28 Feb 2019 11:03:39 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DAA0542045; Thu, 28 Feb 2019 11:03:38 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4FA0142041; Thu, 28 Feb 2019 11:03:38 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.49]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 28 Feb 2019 11:03:38 +0000 (GMT) Subject: Re: [PATCH v4 1/7] s390: ap: kvm: add PQAP interception for AQIC From: Christian Borntraeger To: Tony Krowiak , pmorel@linux.ibm.com Cc: alex.williamson@redhat.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, pasic@linux.ibm.com, david@redhat.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, freude@linux.ibm.com, mimu@linux.ibm.com References: <1550849400-27152-1-git-send-email-pmorel@linux.ibm.com> <1550849400-27152-2-git-send-email-pmorel@linux.ibm.com> <9f1d9241-39b9-adbc-d0e9-cb702e609cbc@linux.ibm.com> <4dc59125-7f96-cba8-651b-382ed8f8bff8@linux.ibm.com> <8526f468-9a4d-68d2-3868-0dad5ce16f46@linux.ibm.com> <6058a017-6404-af3c-62ef-2452214ac97c@de.ibm.com> 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: <6058a017-6404-af3c-62ef-2452214ac97c@de.ibm.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 19022811-0012-0000-0000-000002FB3F5B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19022811-0013-0000-0000-00002132EB05 Message-Id: <2391adc2-6611-034c-61c5-feb46e2a751b@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-02-28_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=886 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902280077 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28.02.2019 10:42, Christian Borntraeger wrote: [...] >> Okay, let's go back to the genesis of this discussion; namely, my >> suggestion about moving the fc == 0x03 check into the hook code. If >> the vfio_ap module is not loaded, there will be no hook code. In that >> case, the check for the hook will fail and ultimately response code >> 0x01 will be set in the status word (which may not be the right thing >> to do?). You have not stated a single good reason for keeping this >> check, but I'm done with this silly argument. It certainly doesn't >> hurt anything. > > The instruction handler must handle the basic checks for the > instruction itself as outlined above. > > Do we want to allow QEMU to fully emulate everything (the ECA_APIE case being off)? > The we should pass along everything to QEMU, but this is already done with the > ECA_APIE check, correct? > > Do we agree that when we are beyond the ECA_APIE check, that we do not emulate > in QEMU and we have enabled the AP instructions interpretion? > If yes then this has some implication: > > 1. ECA is on and we should only get PQAP interception for specific FC (namely 3). > 2. What we certainly should check is the facility bit of the guest (65) and reject fc==3 > right away with a specification exception. I do not want the hook to mess with > the kvm cpu model. @Pierre would be good to actually check test_kvm_facility(vcpu->kvm, 65)) > 3. What shall we do when fc == 0x3? We can certainly do the check here OR in the > hook. As long as we have only fc==3 this does not matter. > > Correct? Thinking more about that, I think we should inject a specification exception for all unknown FCc != 0x3. That would also qualify for keeping it in the instruction handler.