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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 0D2EAC433E0 for ; Thu, 9 Jul 2020 14:47:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3FA52074B for ; Thu, 9 Jul 2020 14:47:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727856AbgGIOrs (ORCPT ); Thu, 9 Jul 2020 10:47:48 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:35306 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726517AbgGIOrs (ORCPT ); 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Thu, 09 Jul 2020 14:47:36 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 069ElXWW57868576 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 9 Jul 2020 14:47:33 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B5E29AE055; Thu, 9 Jul 2020 14:47:33 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D72AAE051; Thu, 9 Jul 2020 14:47:33 +0000 (GMT) Received: from oc2783563651 (unknown [9.145.152.61]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 9 Jul 2020 14:47:32 +0000 (GMT) Date: Thu, 9 Jul 2020 16:47:00 +0200 From: Halil Pasic To: Pierre Morel Cc: Cornelia Huck , linux-kernel@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, mst@redhat.com, jasowang@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 Subject: Re: [PATCH v5 2/2] s390: virtio: PV needs VIRTIO I/O device protection Message-ID: <20200709164700.09a83069.pasic@linux.ibm.com> In-Reply-To: <270d8674-0f73-0a38-a2a7-fbc1caa44301@linux.ibm.com> References: <1594283959-13742-1-git-send-email-pmorel@linux.ibm.com> <1594283959-13742-3-git-send-email-pmorel@linux.ibm.com> <20200709105733.6d68fa53.cohuck@redhat.com> <270d8674-0f73-0a38-a2a7-fbc1caa44301@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-09_08:2020-07-09,2020-07-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 malwarescore=0 priorityscore=1501 spamscore=0 suspectscore=0 phishscore=0 mlxscore=0 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007090104 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 9 Jul 2020 12:51:58 +0200 Pierre Morel wrote: > >> +int arch_validate_virtio_features(struct virtio_device *dev) > >> +{ > >> + if (!is_prot_virt_guest()) > >> + return 0; > >> + > >> + if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) { > >> + dev_warn(&dev->dev, "device must provide VIRTIO_F_VERSION_1\n"); > > > > I'd probably use "legacy virtio not supported with protected > > virtualization". > > > >> + return -ENODEV; > >> + } > >> + > >> + if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) { > >> + dev_warn(&dev->dev, > >> + "device must provide VIRTIO_F_IOMMU_PLATFORM\n"); > > > > "support for limited memory access required for protected > > virtualization" > > > > ? > > > > Mentioning the feature flag is shorter in both cases, though. > > And I think easier to look for in case of debugging purpose. > I change it if there is more demands. Not all our end users are kernel and/or qemu developers. I find the messages from v4 less technical, more informative, and way better. Regards, Halil