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Tsirkin" Cc: linux-kernel@vger.kernel.org, pasic@linux.ibm.com, borntraeger@de.ibm.com, frankja@linux.ibm.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 References: <1592390637-17441-1-git-send-email-pmorel@linux.ibm.com> <1592390637-17441-2-git-send-email-pmorel@linux.ibm.com> <20200629115651-mutt-send-email-mst@kernel.org> <20200629180526.41d0732b.cohuck@redhat.com> From: Pierre Morel Message-ID: <26ecd4c6-837b-1ce6-170b-a0155e4dd4d4@linux.ibm.com> Date: Thu, 2 Jul 2020 15:03:51 +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: <20200629180526.41d0732b.cohuck@redhat.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=2.50.10434:6.0.235,18.0.687 definitions=2020-07-02_08:2020-07-02,2020-07-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 cotscore=-2147483648 spamscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 phishscore=0 mlxlogscore=881 suspectscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2007020094 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-06-29 18:05, Cornelia Huck wrote: > On Mon, 29 Jun 2020 11:57:14 -0400 > "Michael S. Tsirkin" wrote: > >> On Wed, Jun 17, 2020 at 12:43:57PM +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. >>> >>> Signed-off-by: Pierre Morel >>> Acked-by: Jason Wang >>> Acked-by: Christian Borntraeger >>> --- >>> arch/s390/mm/init.c | 6 ++++++ >>> drivers/virtio/virtio.c | 22 ++++++++++++++++++++++ >>> include/linux/virtio.h | 2 ++ >>> 3 files changed, 30 insertions(+) > >>> @@ -179,6 +194,13 @@ int virtio_finalize_features(struct virtio_device *dev) >>> if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) >>> return 0; >>> >>> + if (arch_needs_virtio_iommu_platform(dev) && >>> + !virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) { >>> + dev_warn(&dev->dev, >>> + "virtio: device must provide VIRTIO_F_IOMMU_PLATFORM\n"); >>> + return -ENODEV; >>> + } >>> + >>> virtio_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK); >>> status = dev->config->get_status(dev); >>> if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) { >> >> Well don't you need to check it *before* VIRTIO_F_VERSION_1, not after? > > But it's only available with VERSION_1 anyway, isn't it? So it probably > also needs to fail when this feature is needed if VERSION_1 has not been > negotiated, I think. > Yes, clearly, I will add this. Thanks, Pierre -- Pierre Morel IBM Lab Boeblingen