From patchwork Thu Oct 19 14:34:45 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: 13429314 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 AC0C5CDB465 for ; Thu, 19 Oct 2023 14:37:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtU7f-0006nA-3G; Thu, 19 Oct 2023 10:35:39 -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 1qtU7d-0006mY-5W for qemu-devel@nongnu.org; Thu, 19 Oct 2023 10:35:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qtU7b-0000KR-0P for qemu-devel@nongnu.org; Thu, 19 Oct 2023 10:35:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697726134; 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=lHNFX3ofnKu86+DZXvOE4y9EuARaoFC8lLH6W+llj94=; b=FAX0rMLEdJq9I/T9lXO8SvG8HCuiACchFTIf099KJ6ORYAxauQmefc9IwL0sTisJMzSGb9 UrXppTOKTsjbqeCK8h1ntw4wgCfORazZrhj74m+jIQUXRNk1p2iV1Ke2xyB3YxVNlBBjoL 9J5UJkN1fA6B9LbZA5XncDbSCWNGV6Y= 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-599-Vpa_D9nvMXORELsRMUlMJA-1; Thu, 19 Oct 2023 10:35:20 -0400 X-MC-Unique: Vpa_D9nvMXORELsRMUlMJA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8F635857A91; Thu, 19 Oct 2023 14:35:19 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5A489C15BB8; Thu, 19 Oct 2023 14:35:17 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Shannon , Parav Pandit , Stefano Garzarella , "Michael S. Tsirkin" , yin31149@gmail.com, Jason Wang , Yajun Wu , Zhu Lingshan , Lei Yang , Dragos Tatulea , Juan Quintela , Laurent Vivier , si-wei.liu@oracle.com, Gautam Dawar Subject: [RFC PATCH 08/18] vdpa: move backend_cap to vhost_vdpa_shared Date: Thu, 19 Oct 2023 16:34:45 +0200 Message-Id: <20231019143455.2377694-9-eperezma@redhat.com> In-Reply-To: <20231019143455.2377694-1-eperezma@redhat.com> References: <20231019143455.2377694-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 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: -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_H4=0.001, RCVD_IN_MSPIKE_WL=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 Next patches will register the vhost_vdpa memory listener while the VM is migrating at the destination, so we can map the memory to the device before stopping the VM at the source. The main goal is to reduce the downtime. However, the destination QEMU is unaware of which vhost_vdpa device will register its memory_listener. If the source guest has CVQ enabled, it will be the CVQ device. Otherwise, it will be the first one. Move the backend_cap member to VhostVDPAShared so all vhost_vdpa can use it, rather than always in the first / last vhost_vdpa. Signed-off-by: Eugenio Pérez --- include/hw/virtio/vhost-vdpa.h | 3 +++ hw/virtio/vhost-vdpa.c | 8 +++++--- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h index 05219bbcf7..11ac14085a 100644 --- a/include/hw/virtio/vhost-vdpa.h +++ b/include/hw/virtio/vhost-vdpa.h @@ -38,6 +38,9 @@ typedef struct vhost_vdpa_shared { /* IOVA mapping used by the Shadow Virtqueue */ VhostIOVATree *iova_tree; + /* Copy of backend features */ + uint64_t backend_cap; + bool iotlb_batch_begin_sent; /* Vdpa must send shadow addresses as IOTLB key for data queues, not GPA */ diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 3da5a19a9e..124323de43 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -160,7 +160,7 @@ static void vhost_vdpa_listener_begin_batch(struct vhost_vdpa *v) static void vhost_vdpa_iotlb_batch_begin_once(struct vhost_vdpa *v) { - if (v->dev->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH) && + if (v->shared->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH) && !v->shared->iotlb_batch_begin_sent) { vhost_vdpa_listener_begin_batch(v); } @@ -171,11 +171,10 @@ static void vhost_vdpa_iotlb_batch_begin_once(struct vhost_vdpa *v) static void vhost_vdpa_listener_commit(MemoryListener *listener) { struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener); - struct vhost_dev *dev = v->dev; struct vhost_msg_v2 msg = {}; int fd = v->shared->device_fd; - if (!(dev->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH))) { + if (!(v->shared->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH))) { return; } @@ -833,6 +832,8 @@ static int vhost_vdpa_set_features(struct vhost_dev *dev, static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) { + struct vhost_vdpa *v = dev->opaque; + uint64_t features; uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH | @@ -854,6 +855,7 @@ static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) } dev->backend_cap = features; + v->shared->backend_cap = features; return 0; }