From patchwork Fri Nov 20 18:50:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 11922023 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90BB0C56201 for ; Fri, 20 Nov 2020 19:12:58 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E6CCD22470 for ; Fri, 20 Nov 2020 19:12:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="R5zHjq7t" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E6CCD22470 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:47122 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kgBq4-0006M0-U0 for qemu-devel@archiver.kernel.org; Fri, 20 Nov 2020 14:12:56 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41234) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kgBXz-00068k-U3 for qemu-devel@nongnu.org; Fri, 20 Nov 2020 13:54:15 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:44841) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kgBXx-0007WS-U4 for qemu-devel@nongnu.org; Fri, 20 Nov 2020 13:54:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605898453; 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=P54fNkbLFlDhwRYgmtpG8Llho8C34w4aU/D/fzEYMnA=; b=R5zHjq7tn3D7j+fjx8/YfqB+mxNQXtT7BN3NqhJ5BiyC/g2PaNPXjwsY8wx9gYI1zxkHCg Hp1qHrWio0wTkBF4cbHzqb0UBsSFTEDvJnVuXCNqn5X2BLxI2CwISqpfjon3sO/JkyF6HY YswnYeVOow6bjZEGaShk/zMMFUB88DU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-547-Ibt8zbtuMPKnozMX7xzKtA-1; Fri, 20 Nov 2020 13:54:11 -0500 X-MC-Unique: Ibt8zbtuMPKnozMX7xzKtA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 636981084423; Fri, 20 Nov 2020 18:54:08 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-112-88.ams2.redhat.com [10.36.112.88]) by smtp.corp.redhat.com (Postfix) with ESMTP id 375E35C1D5; Fri, 20 Nov 2020 18:53:55 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Subject: [RFC PATCH 12/27] virtio: Add virtio_queue_full Date: Fri, 20 Nov 2020 19:50:50 +0100 Message-Id: <20201120185105.279030-13-eperezma@redhat.com> In-Reply-To: <20201120185105.279030-1-eperezma@redhat.com> References: <20201120185105.279030-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Received-SPF: pass client-ip=216.205.24.124; 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_H3=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" , Jason Wang , Daniel Daly , virtualization@lists.linux-foundation.org, Liran Alon , Eli Cohen , Nitin Shrivastav , Alex Barba , Christophe Fontaine , Juan Quintela , Lee Ballard , Lars Ganrot , Rob Miller , Stefano Garzarella , Howard Cai , Parav Pandit , vm , Salil Mehta , Stephen Finucane , Xiao W Wang , Sean Mooney , Stefan Hajnoczi , Jim Harford , Dmytro Kazantsev , Siwei Liu , Harpreet Singh Anand , Michael Lilja , Max Gurtovoy Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Eugenio Pérez --- include/hw/virtio/virtio.h | 2 ++ hw/virtio/virtio.c | 15 +++++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index b9b8497ea0..0a7f5cc63e 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -233,6 +233,8 @@ int virtio_queue_ready(VirtQueue *vq); int virtio_queue_empty(VirtQueue *vq); +bool virtio_queue_full(const VirtQueue *vq); + /* Host binding interface. */ uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 3469946538..77ca5f6b6f 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -684,6 +684,17 @@ int virtio_queue_empty(VirtQueue *vq) } } +static bool virtio_queue_full_rcu(const VirtQueue *vq) +{ + return vq->inuse >= vq->vring.num; +} + +bool virtio_queue_full(const VirtQueue *vq) +{ + RCU_READ_LOCK_GUARD(); + return virtio_queue_full_rcu(vq); +} + static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, unsigned int len) { @@ -1453,7 +1464,7 @@ static void *virtqueue_split_pop(VirtQueue *vq, size_t sz) max = vq->vring.num; - if (vq->inuse >= vq->vring.num) { + if (unlikely(virtio_queue_full_rcu(vq))) { virtio_error(vdev, "Virtqueue size exceeded"); goto done; } @@ -1588,7 +1599,7 @@ static void *virtqueue_packed_pop(VirtQueue *vq, size_t sz) max = vq->vring.num; - if (vq->inuse >= vq->vring.num) { + if (unlikely(virtio_queue_full_rcu(vq))) { virtio_error(vdev, "Virtqueue size exceeded"); goto done; }