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Tsirkin" Subject: virtio-vsock requires 'disable-legacy=on' in QEMU 5.1 Message-ID: MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=sgarzare@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.81; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/13 02:03:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Halil Pasic , Qinghua Cheng , qemu devel list , Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hi, Qinghua discovered that virtio-vsock-pci requires 'disable-legacy=3Don' in QEMU 5.1: $ ./qemu-system-x86_64 ... -device vhost-vsock-pci,guest-cid=3D5 qemu-system-x86_64: -device vhost-vsock-pci,guest-cid=3D5: device is modern-only, use disable-legacy=3Don Bisecting I found that this behaviour starts from this commit: 9b3a35ec82 ("virtio: verify that legacy support is not accidentally on") IIUC virtio-vsock is modern-only, so I tried this patch and it works: diff --git a/hw/virtio/vhost-user-vsock-pci.c b/hw/virtio/vhost-user-vsock-= pci.c index f4cf95873d..6e4cc874cd 100644 --- a/hw/virtio/vhost-user-vsock-pci.c +++ b/hw/virtio/vhost-user-vsock-pci.c @@ -40,6 +40,7 @@ static void vhost_user_vsock_pci_realize(VirtIOPCIProxy *= vpci_dev, Error **errp) VHostUserVSockPCI *dev =3D VHOST_USER_VSOCK_PCI(vpci_dev); DeviceState *vdev =3D DEVICE(&dev->vdev); + virtio_pci_force_virtio_1(vpci_dev); qdev_realize(vdev, BUS(&vpci_dev->bus), errp); } diff --git a/hw/virtio/vhost-vsock-pci.c b/hw/virtio/vhost-vsock-pci.c index a815278e69..f641b974e9 100644 --- a/hw/virtio/vhost-vsock-pci.c +++ b/hw/virtio/vhost-vsock-pci.c @@ -44,6 +44,7 @@ static void vhost_vsock_pci_realize(VirtIOPCIProxy *vpci_= dev, Error **errp) VHostVSockPCI *dev =3D VHOST_VSOCK_PCI(vpci_dev); DeviceState *vdev =3D DEVICE(&dev->vdev); + virtio_pci_force_virtio_1(vpci_dev); qdev_realize(vdev, BUS(&vpci_dev->bus), errp); } Do you think this is the right approach or is there a better way to solve this issue? Thanks, Stefano