From nobody Sat Feb 7 07:10:01 2026 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=1652988800; cv=none; d=zohomail.com; s=zohoarc; b=FgYq/8EITeP2rqVdMdRFDzhe+KxG7J9i4qbg3M4bFiiR7mNRnPTEG3C7FBsbosyKnf6O3s3hvs5JVRy1QlpJ6DE8OKw7mV2pDMm1fVyiAP2jl5c1GeiSrea1NzheHmtC7J9fBancZ7gNbq3s60FLwNt+7TsEh0i/WybuYQVmyH0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1652988800; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=ZuS07kiIQEXSFOQblRFIUzZ7Vg9qIIPzvSO/iExh9s4=; b=TvUVPIVERbBqmpraguyBIXjdDOha7aXRgWj3gzo8D3USasmF5WFiXIayDVthoQLcEatrCYDZMpcbgDtOe1NuyM561lJspltOV0+Q9EZkzKzu3VYjJ+wylNxD7RSc7yI3860zVCyDABYcSHqbe6X8MeLwpzMSrg4O3A5OeBVrUr0= 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 1652988800050145.95444333576427; Thu, 19 May 2022 12:33:20 -0700 (PDT) Received: from localhost ([::1]:33742 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nrlte-0002Cy-7g for importer@patchew.org; Thu, 19 May 2022 15:33:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48192) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nrlaq-0005Uh-0J for qemu-devel@nongnu.org; Thu, 19 May 2022 15:13:53 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:53530) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nrlao-0006Pv-GA for qemu-devel@nongnu.org; Thu, 19 May 2022 15:13:51 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-653--Wz40Z1KNPmUfbndZPXj9w-1; Thu, 19 May 2022 15:13:46 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DECBB800B21; Thu, 19 May 2022 19:13:45 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.193.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5571A2026D6A; Thu, 19 May 2022 19:13:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652987629; 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=ZuS07kiIQEXSFOQblRFIUzZ7Vg9qIIPzvSO/iExh9s4=; b=H310Lw+IfqQ2Jm1XnQ18sudkGEqsK26fF3ZmD6LM5r1fxxNeQKe3WfbBeReJ9AsAecVpG0 LK9TzMZ/MSae6EQi7r/m2aSo9ND9o2tlll0iVHH/GigvHPcwS+oDTyP+bw4pDAXFX18Sy7 S7peESyOVzhwfNfMUdcJsqoGDShj6J8= X-MC-Unique: -Wz40Z1KNPmUfbndZPXj9w-1 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Gautam Dawar , "Michael S. Tsirkin" , Markus Armbruster , "Gonglei (Arei)" , Harpreet Singh Anand , Cornelia Huck , Zhu Lingshan , Laurent Vivier , Eli Cohen , Paolo Bonzini , Liuxiangdong , Eric Blake , Cindy Lu , Jason Wang , Parav Pandit Subject: [RFC PATCH v8 12/21] vdpa: delay set_vring_ready after DRIVER_OK Date: Thu, 19 May 2022 21:12:57 +0200 Message-Id: <20220519191306.821774-13-eperezma@redhat.com> In-Reply-To: <20220519191306.821774-1-eperezma@redhat.com> References: <20220519191306.821774-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 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=170.10.129.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1652988800678100001 To restore the device in the destination of a live migration we send the commands through control virtqueue. For a device to read CVQ it must have received DRIVER_OK status bit. However this open a window where the device could start receiving packets in rx queue 0 before it receive the RSS configuration. To avoid that, we will not send vring_enable until all configuration is used by the device. As a first step, reverse the DRIVER_OK and SET_VRING_ENABLE steps. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-vdpa.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 31b3d4d013..13e5e2a061 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -748,13 +748,18 @@ static int vhost_vdpa_get_vq_index(struct vhost_dev *= dev, int idx) return idx; } =20 +/** + * Set ready all vring of the device + * + * @dev: Vhost device + */ static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev) { int i; trace_vhost_vdpa_set_vring_ready(dev); - for (i =3D 0; i < dev->nvqs; ++i) { + for (i =3D 0; i < dev->vq_index_end; ++i) { struct vhost_vring_state state =3D { - .index =3D dev->vq_index + i, + .index =3D i, .num =3D 1, }; vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state); @@ -1117,7 +1122,6 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev= , bool started) if (unlikely(!ok)) { return -1; } - vhost_vdpa_set_vring_ready(dev); } else { ok =3D vhost_vdpa_svqs_stop(dev); if (unlikely(!ok)) { @@ -1131,16 +1135,22 @@ static int vhost_vdpa_dev_start(struct vhost_dev *d= ev, bool started) } =20 if (started) { + int r; memory_listener_register(&v->listener, &address_space_memory); - return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); + r =3D vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); + if (unlikely(r)) { + return r; + } + vhost_vdpa_set_vring_ready(dev); } else { vhost_vdpa_reset_device(dev); vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER); memory_listener_unregister(&v->listener); =20 - return 0; } + + return 0; } =20 static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base, --=20 2.27.0