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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable 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 368CEC433E0 for ; Tue, 7 Jul 2020 11:14:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1DAA920702 for ; Tue, 7 Jul 2020 11:14:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728309AbgGGLN7 (ORCPT ); Tue, 7 Jul 2020 07:13:59 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:36036 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725944AbgGGLN7 (ORCPT ); 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Tue, 07 Jul 2020 11:13:47 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 067BB8ah58720686 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 7 Jul 2020 11:11:08 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D56854C04E; Tue, 7 Jul 2020 11:12:29 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D8EE4C052; Tue, 7 Jul 2020 11:12:29 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.8.102]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 7 Jul 2020 11:12:28 +0000 (GMT) Subject: Re: [PATCH v4 2/2] s390: virtio: PV needs VIRTIO I/O device protection To: Pierre Morel , linux-kernel@vger.kernel.org Cc: pasic@linux.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: <1594111477-15401-1-git-send-email-pmorel@linux.ibm.com> <1594111477-15401-3-git-send-email-pmorel@linux.ibm.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <1594111477-15401-3-git-send-email-pmorel@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-07_06:2020-07-07,2020-07-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 phishscore=0 mlxlogscore=999 mlxscore=0 cotscore=-2147483648 lowpriorityscore=0 bulkscore=0 adultscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2007070081 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 07.07.20 10:44, Pierre Morel wrote: > S390, protecting the guest memory against unauthorized host access > needs to enforce VIRTIO I/O device protection through the use of > VIRTIO_F_VERSION_1 and VIRTIO_F_IOMMU_PLATFORM. > > Signed-off-by: Pierre Morel > --- > arch/s390/kernel/uv.c | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c > index c296e5c8dbf9..106330f6eda1 100644 > --- a/arch/s390/kernel/uv.c > +++ b/arch/s390/kernel/uv.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -413,3 +414,27 @@ static int __init uv_info_init(void) > } > device_initcall(uv_info_init); > #endif > + > +/* > + * arch_validate_virtio_iommu_platform > + * @dev: the VIRTIO device being added > + * > + * Return value: returns -ENODEV if any features of the > + * device breaks the protected virtualization > + * 0 otherwise. > + */ > +int arch_validate_virtio_features(struct virtio_device *dev) > +{ > + if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) { > + dev_warn(&dev->dev, "device must provide VIRTIO_F_VERSION_1\n"); I think you only want to warn if is_prot_virt_guest is true? We certainly want to be able to run as a guest of older hypervisors with virtio 0.95, no? > + return is_prot_virt_guest() ? -ENODEV : 0; > + } > + > + if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) { > + dev_warn(&dev->dev, > + "device must provide VIRTIO_F_IOMMU_PLATFORM\n"); same here. > + return is_prot_virt_guest() ? -ENODEV : 0; > + } > + > + return 0; > +} >