From nobody Fri May 17 10:34:32 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1710511504; cv=none; d=zohomail.com; s=zohoarc; b=WsTEK+P+7LsSEPQnW5juFbPvGZgz7IebuNQfvacatCmR7nH/YO71OepU/t8fcQGjAXf1xZO0+FLcf9UbPOAzk9eGdlF55BdTWUCrT/4IcOkGpm3JEYRqzTvLzGU7IWSKNTeYzyURICuBMHdJ8LPRxAaGCoUbdvOyAWa4NdXkqnw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1710511504; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=RYzFqRE3f6gB4yYLdviaQXEsUX0/Oh4jZFM/HbqXEpg=; b=IFcGUVWiocdkdsyhxTlhP4vWeLLO9di0AP44a4lj3K4MDjpBqPPpCmvOwVdSeIhnX7Wv1tT3a3Y+yoxNeSxChJeiDX596kYkwYyT1sVdZuICesaPBMhiExSJUowHgBIAzjazcOuQHnxsW6rwhR+iclVTpSa1iQHfXYTSJZ7yfBQ= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1710511504116881.7222559277342; Fri, 15 Mar 2024 07:05:04 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rl8AC-0006jw-UI; Fri, 15 Mar 2024 10:04:00 -0400 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 1rl8AA-0006jP-E2 for qemu-devel@nongnu.org; Fri, 15 Mar 2024 10:03:58 -0400 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 1rl8A1-0002zg-Et for qemu-devel@nongnu.org; Fri, 15 Mar 2024 10:03:57 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-554-GSIHBEl1Mg-VUU-OxaAaqg-1; Fri, 15 Mar 2024 10:03:45 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5EA1180026D; Fri, 15 Mar 2024 14:03:45 +0000 (UTC) Received: from merkur.redhat.com (unknown [10.39.194.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id F2AA840C6DB7; Fri, 15 Mar 2024 14:03:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710511428; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=RYzFqRE3f6gB4yYLdviaQXEsUX0/Oh4jZFM/HbqXEpg=; b=Tudtc132bL8MFOEvrP2OKbP5fjUSoGTBv5I+eguBMlkyzRjKnwoQTk8juXrSU2iHMf1/cf 2eMTiCjVQHYtPCSg4ef9kO5lVDz3sJHSpahWpwJZ5TyWPxFNF/Fbn/FPMMYFYFAlxbYlbS puCGUgPzLpV4hWCLHV9bmkgT3yHFPnY= X-MC-Unique: GSIHBEl1Mg-VUU-OxaAaqg-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, mst@redhat.com, sgarzare@redhat.com, eperezma@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org, qemu-stable@nongnu.org Subject: [PATCH for-9.0 v2] vdpa-dev: Fix initialisation order to restore VDUSE compatibility Date: Fri, 15 Mar 2024 15:03:31 +0100 Message-ID: <20240315140331.59227-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 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=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.933, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_HELO_TEMPERROR=0.01, T_SPF_TEMPERROR=0.01 autolearn=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1710511515588100001 Content-Type: text/plain; charset="utf-8" VDUSE requires that virtqueues are first enabled before the DRIVER_OK status flag is set; with the current API of the kernel module, it is impossible to enable the opposite order in our block export code because userspace is not notified when a virtqueue is enabled. This requirement also mathces the normal initialisation order as done by the generic vhost code in QEMU. However, commit 6c482547 accidentally changed the order for vdpa-dev and broke access to VDUSE devices with this. This changes vdpa-dev to use the normal order again and use the standard vhost callback .vhost_set_vring_enable for this. VDUSE devices can be used with vdpa-dev again after this fix. vhost_net intentionally avoided enabling the vrings for vdpa and does this manually later while it does enable them for other vhost backends. Reflect this in the vhost_net code and return early for vdpa, so that the behaviour doesn't change for this device. Cc: qemu-stable@nongnu.org Fixes: 6c4825476a4351530bcac17abab72295b75ffe98 Signed-off-by: Kevin Wolf --- v2: - Actually make use of the @enable parameter - Change vhost_net to preserve the current behaviour hw/net/vhost_net.c | 10 ++++++++++ hw/virtio/vdpa-dev.c | 5 +---- hw/virtio/vhost-vdpa.c | 27 +++++++++++++++++++++++++-- hw/virtio/vhost.c | 8 +++++++- 4 files changed, 43 insertions(+), 7 deletions(-) diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index e8e1661646..fd1a93701a 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -541,6 +541,16 @@ int vhost_set_vring_enable(NetClientState *nc, int ena= ble) VHostNetState *net =3D get_vhost_net(nc); const VhostOps *vhost_ops =3D net->dev.vhost_ops; =20 + /* + * vhost-vdpa network devices need to enable dataplane virtqueues after + * DRIVER_OK, so they can recover device state before starting datapla= ne. + * Because of that, we don't enable virtqueues here and leave it to + * net/vhost-vdpa.c. + */ + if (nc->info->type =3D=3D NET_CLIENT_DRIVER_VHOST_VDPA) { + return 0; + } + nc->vring_enable =3D enable; =20 if (vhost_ops && vhost_ops->vhost_set_vring_enable) { diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c index eb9ecea83b..13e87f06f6 100644 --- a/hw/virtio/vdpa-dev.c +++ b/hw/virtio/vdpa-dev.c @@ -253,14 +253,11 @@ static int vhost_vdpa_device_start(VirtIODevice *vdev= , Error **errp) =20 s->dev.acked_features =3D vdev->guest_features; =20 - ret =3D vhost_dev_start(&s->dev, vdev, false); + ret =3D vhost_dev_start(&s->dev, vdev, true); if (ret < 0) { error_setg_errno(errp, -ret, "Error starting vhost"); goto err_guest_notifiers; } - for (i =3D 0; i < s->dev.nvqs; ++i) { - vhost_vdpa_set_vring_ready(&s->vdpa, i); - } s->started =3D true; =20 /* diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index ddae494ca8..401afac2f5 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -886,12 +886,13 @@ static int vhost_vdpa_get_vq_index(struct vhost_dev *= dev, int idx) return idx; } =20 -int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, unsigned idx) +static int vhost_vdpa_set_vring_enable_one(struct vhost_vdpa *v, unsigned = idx, + int enable) { struct vhost_dev *dev =3D v->dev; struct vhost_vring_state state =3D { .index =3D idx, - .num =3D 1, + .num =3D enable, }; int r =3D vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state); =20 @@ -899,6 +900,27 @@ int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, u= nsigned idx) return r; } =20 +static int vhost_vdpa_set_vring_enable(struct vhost_dev *dev, int enable) +{ + struct vhost_vdpa *v =3D dev->opaque; + unsigned int i; + int ret; + + for (i =3D 0; i < dev->nvqs; ++i) { + ret =3D vhost_vdpa_set_vring_enable_one(v, i, enable); + if (ret < 0) { + return ret; + } + } + + return 0; +} + +int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, unsigned idx) +{ + return vhost_vdpa_set_vring_enable_one(v, idx, 1); +} + static int vhost_vdpa_set_config_call(struct vhost_dev *dev, int fd) { @@ -1514,6 +1536,7 @@ const VhostOps vdpa_ops =3D { .vhost_set_features =3D vhost_vdpa_set_features, .vhost_reset_device =3D vhost_vdpa_reset_device, .vhost_get_vq_index =3D vhost_vdpa_get_vq_index, + .vhost_set_vring_enable =3D vhost_vdpa_set_vring_enable, .vhost_get_config =3D vhost_vdpa_get_config, .vhost_set_config =3D vhost_vdpa_set_config, .vhost_requires_shm_log =3D NULL, diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 2c9ac79468..decfb85184 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1984,7 +1984,13 @@ static int vhost_dev_set_vring_enable(struct vhost_d= ev *hdev, int enable) return hdev->vhost_ops->vhost_set_vring_enable(hdev, enable); } =20 -/* Host notifiers must be enabled at this point. */ +/* + * Host notifiers must be enabled at this point. + * + * If @vring is true, this function will enable all vrings before starting= the + * device. If it is false, the vring initialization is left to be done by = the + * caller. + */ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vring= s) { int i, r; --=20 2.44.0