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=-0.8 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 38E24C43382 for ; Thu, 27 Sep 2018 11:59:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D45AA20833 for ; Thu, 27 Sep 2018 11:59:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D45AA20833 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 S1727318AbeI0SRb (ORCPT ); Thu, 27 Sep 2018 14:17:31 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:51016 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727213AbeI0SRa (ORCPT ); Thu, 27 Sep 2018 14:17:30 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w8RBxFIv014965 for ; Thu, 27 Sep 2018 07:59:32 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2mrxt7g122-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 27 Sep 2018 07:59:31 -0400 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) Thu, 27 Sep 2018 12:59:27 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w8RBxPEh48955424 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 27 Sep 2018 11:59:25 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 30DF452051; Thu, 27 Sep 2018 14:59:06 +0100 (BST) Received: from oc7455500831.ibm.com (unknown [9.152.224.20]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 54E2E5204F; Thu, 27 Sep 2018 14:59:04 +0100 (BST) Subject: Re: [PATCH v11 26/26] s390: doc: detailed specifications for AP virtualization To: Cornelia Huck , Halil Pasic Cc: Alex Williamson , Tony Krowiak , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, frankja@linux.ibm.com, Tony Krowiak References: <20180925231641.4954-1-akrowiak@linux.vnet.ibm.com> <20180925231641.4954-27-akrowiak@linux.vnet.ibm.com> <20180926164222.74731b74@t450s.home> <20180927135141.0fa87f2c.cohuck@redhat.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: <20180927135141.0fa87f2c.cohuck@redhat.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18092711-0016-0000-0000-0000020B4D8A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18092711-0017-0000-0000-000032627333 Message-Id: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-09-27_06:,, 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-1809270119 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/27/2018 01:51 PM, Cornelia Huck wrote: > On Thu, 27 Sep 2018 13:29:43 +0200 > Halil Pasic wrote: > >> On 09/27/2018 12:42 AM, Alex Williamson wrote: >>> On Tue, 25 Sep 2018 19:16:41 -0400 >>> Tony Krowiak wrote: >>>> + This is how the matrix is configured for Guest2: >>>> + >>>> + echo 5 > assign_adapter >>>> + echo 0x47 > assign_domain >>>> + echo 0xff > assign_domain >>>> + >>>> + This is how the matrix is configured for Guest3: >>>> + >>>> + echo 6 > assign_adapter >>>> + echo 0x47 > assign_domain >>>> + echo 0xff > assign_domain >>>> + >>> >>> I'm curious why this interface didn't adopt the +/- notation invented >>> above for consistency. Too difficult to do rollbacks with a string on >>> entries? >>> >> >> I remember that we did discuss that possibility around v9, but I can't >> tell why did we decide to not implement it. Maybe Tony has an answer. > > IIRC, that was a discussion on the base ap driver interfaces rather > than vfio-ap. > >> >> Anyway, if we were to do that, we would use different attribute names >> (e.g. just domain_mask, or something similar instead of >> (assign|unassign)_xxx). So I think such an interface can still be added >> on top of the existing one. Having that said having multiple interfaces >> for the very same thing is usually not so nice IMHO. > > Nod to all of your points. > > As we do the configuration while the guest is not running anyway, the > different interfaces probably do not make that much difference in > practice. It should be fine to stick to the current interface for now > and only add a new one if we really think it is significantly better. Tony, can you maybe provide a quick on-top patch that clarifies Alex comments regarding the documentation? (State that is is big endian, fixup the small things etc). I can then either fold it in or provide it as an on top patch depending on how much has changed.