From patchwork Fri Feb 3 19:11:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 13128286 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7BBF8C61DA4 for ; Fri, 3 Feb 2023 19:13:00 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pO1U6-0006lw-Vv; Fri, 03 Feb 2023 14:12:31 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pO1Tr-0006aj-EE for qemu-devel@nongnu.org; Fri, 03 Feb 2023 14:12:15 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pO1Tm-0007Yj-UR for qemu-devel@nongnu.org; Fri, 03 Feb 2023 14:12:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675451525; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xRR25skpeshYFqOBbCZA5w9c00eqzmw6VsmZSUlCj40=; b=GkBrvPkNd2nHUXRBGAU4HQp+Az3SDjUU5Y2tn5pwIVIIz/CB8Lhc/gIzSbNntPDlB3H6i/ rKQktqtDui3yuiXvTo+mVTqugOZyFJAiaUawYReECQqs3N8FY0ITptrQMiWYsuwfM4hj9u YvaNkslQNbdALfTJdOr8aDGntyVLvQY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-154-aNOk-EefPbWRTm_i9SZmWQ-1; Fri, 03 Feb 2023 14:12:01 -0500 X-MC-Unique: aNOk-EefPbWRTm_i9SZmWQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B4970100F907; Fri, 3 Feb 2023 19:12:00 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.194.221]) by smtp.corp.redhat.com (Postfix) with ESMTP id D1BF5492C14; Fri, 3 Feb 2023 19:11:57 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Cindy Lu , Liuxiangdong , alvaro.karsz@solid-run.com, Zhu Lingshan , Jason Wang , longpeng2@huawei.com, "Michael S. Tsirkin" , Shannon Nelson , Eli Cohen , Stefan Hajnoczi , virtualization@lists.linux-foundation.org, Parav Pandit , si-wei.liu@oracle.com, Laurent Vivier , Gautam Dawar , Stefano Garzarella , Harpreet Singh Anand , "Gonglei (Arei)" Subject: [PATCH 04/13] vdpa: move vhost reset after get vring base Date: Fri, 3 Feb 2023 20:11:33 +0100 Message-Id: <20230203191142.362623-5-eperezma@redhat.com> In-Reply-To: <20230203191142.362623-1-eperezma@redhat.com> References: <20230203191142.362623-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=-0.001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The function vhost.c:vhost_dev_stop calls vhost operation vhost_dev_start(false). In the case of vdpa it totally reset and wipes the device, making the fetching of the vring base (virtqueue state) totally useless. The kernel backend does not use vhost_dev_start vhost op callback, but vhost-user do. A patch to make vhost_user_dev_start more similar to vdpa is desirable, but it can be added on top. Signed-off-by: Eugenio Pérez --- include/hw/virtio/vhost-backend.h | 4 ++++ hw/virtio/vhost-vdpa.c | 22 ++++++++++++++++------ hw/virtio/vhost.c | 3 +++ 3 files changed, 23 insertions(+), 6 deletions(-) diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index c5ab49051e..ec3fbae58d 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -130,6 +130,9 @@ typedef bool (*vhost_force_iommu_op)(struct vhost_dev *dev); typedef int (*vhost_set_config_call_op)(struct vhost_dev *dev, int fd); + +typedef void (*vhost_reset_status_op)(struct vhost_dev *dev); + typedef struct VhostOps { VhostBackendType backend_type; vhost_backend_init vhost_backend_init; @@ -177,6 +180,7 @@ typedef struct VhostOps { vhost_get_device_id_op vhost_get_device_id; vhost_force_iommu_op vhost_force_iommu; vhost_set_config_call_op vhost_set_config_call; + vhost_reset_status_op vhost_reset_status; } VhostOps; int vhost_backend_update_device_iotlb(struct vhost_dev *dev, diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index b681841cdc..6d20d70601 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -1152,14 +1152,23 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started) if (started) { memory_listener_register(&v->listener, &address_space_memory); return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); - } else { - vhost_vdpa_reset_device(dev); - vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | - VIRTIO_CONFIG_S_DRIVER); - memory_listener_unregister(&v->listener); + } - return 0; + return 0; +} + +static void vhost_vdpa_reset_status(struct vhost_dev *dev) +{ + struct vhost_vdpa *v = dev->opaque; + + if (dev->vq_index + dev->nvqs != dev->vq_index_end) { + return; } + + vhost_vdpa_reset_device(dev); + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | + VIRTIO_CONFIG_S_DRIVER); + memory_listener_unregister(&v->listener); } static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base, @@ -1346,4 +1355,5 @@ const VhostOps vdpa_ops = { .vhost_vq_get_addr = vhost_vdpa_vq_get_addr, .vhost_force_iommu = vhost_vdpa_force_iommu, .vhost_set_config_call = vhost_vdpa_set_config_call, + .vhost_reset_status = vhost_vdpa_reset_status, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index eb8c4c378c..a266396576 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -2049,6 +2049,9 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) hdev->vqs + i, hdev->vq_index + i); } + if (hdev->vhost_ops->vhost_reset_status) { + hdev->vhost_ops->vhost_reset_status(hdev); + } if (vhost_dev_has_iommu(hdev)) { if (hdev->vhost_ops->vhost_set_iotlb_callback) {