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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 1FD1DC433DF for ; Mon, 29 Jun 2020 18:51:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0869B204EC for ; Mon, 29 Jun 2020 18:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729578AbgF2SvQ (ORCPT ); Mon, 29 Jun 2020 14:51:16 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:6078 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727968AbgF2Sux (ORCPT ); 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Mon, 29 Jun 2020 13:22:40 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05TDMbSC17301516 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 29 Jun 2020 13:22:37 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4875A4C04E; Mon, 29 Jun 2020 13:22:37 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A03E4C040; Mon, 29 Jun 2020 13:21:47 +0000 (GMT) Received: from oc3016276355.ibm.com (unknown [9.145.28.234]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 29 Jun 2020 13:21:44 +0000 (GMT) Subject: Re: [PATCH v3 1/1] s390: virtio: let arch accept devices without IOMMU feature To: Halil Pasic Cc: linux-kernel@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, mst@redhat.com, jasowang@redhat.com, cohuck@redhat.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, virtualization@lists.linux-foundation.org, thomas.lendacky@amd.com, david@gibson.dropbear.id.au, linuxram@us.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com References: <1592390637-17441-1-git-send-email-pmorel@linux.ibm.com> <1592390637-17441-2-git-send-email-pmorel@linux.ibm.com> <20200618002956.5f179de4.pasic@linux.ibm.com> From: Pierre Morel Message-ID: <10b0c837-7609-fb87-857e-5c364b06ab8b@linux.ibm.com> Date: Mon, 29 Jun 2020 15:21:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200618002956.5f179de4.pasic@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-29_11:2020-06-29,2020-06-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 cotscore=-2147483648 malwarescore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 mlxlogscore=539 clxscore=1015 bulkscore=0 phishscore=0 impostorscore=0 priorityscore=1501 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006290089 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-06-18 00:29, Halil Pasic wrote: > On Wed, 17 Jun 2020 12:43:57 +0200 > Pierre Morel wrote: > >> An architecture protecting the guest memory against unauthorized host >> access may want to enforce VIRTIO I/O device protection through the >> use of VIRTIO_F_IOMMU_PLATFORM. >> >> Let's give a chance to the architecture to accept or not devices >> without VIRTIO_F_IOMMU_PLATFORM. >> > [..] > > > I'm still not really satisfied with your commit message, furthermore > I did some thinking about the abstraction you introduce here. I will > give a short analysis of that, but first things first. Your patch does > the job of preventing calamity, and the details can be changed any time, > thus: > > Acked-by: Halil Pasic Thanks, Connie already answered the other points you raised and I have nothing to add on it. Regards, Pierre -- Pierre Morel IBM Lab Boeblingen