From patchwork Thu Dec 1 19:26:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 9456753 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B683260585 for ; Thu, 1 Dec 2016 19:36:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A131B2853F for ; Thu, 1 Dec 2016 19:36:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9461828546; Thu, 1 Dec 2016 19:36:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 15DEF28541 for ; Thu, 1 Dec 2016 19:36:30 +0000 (UTC) Received: from localhost ([::1]:58514 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cCX9h-00035U-AG for patchwork-qemu-devel@patchwork.kernel.org; Thu, 01 Dec 2016 14:36:29 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49077) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cCX0b-0004CU-3n for qemu-devel@nongnu.org; Thu, 01 Dec 2016 14:27:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cCX0a-0002Ze-Cz for qemu-devel@nongnu.org; Thu, 01 Dec 2016 14:27:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48926) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cCX0a-0002ZH-7X for qemu-devel@nongnu.org; Thu, 01 Dec 2016 14:27:04 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 64E687D0E3; Thu, 1 Dec 2016 19:27:03 +0000 (UTC) Received: from localhost (ovpn-112-59.ams2.redhat.com [10.36.112.59]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uB1JR1Mx022898; Thu, 1 Dec 2016 14:27:02 -0500 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Date: Thu, 1 Dec 2016 19:26:43 +0000 Message-Id: <20161201192652.9509-5-stefanha@redhat.com> In-Reply-To: <20161201192652.9509-1-stefanha@redhat.com> References: <20161201192652.9509-1-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Thu, 01 Dec 2016 19:27:03 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v4 04/13] virtio: poll virtqueues for new buffers X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: borntraeger@de.ibm.com, Karl Rister , Fam Zheng , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add an AioContext poll handler to detect new virtqueue buffers without waiting for a guest->host notification. Signed-off-by: Stefan Hajnoczi --- hw/virtio/virtio.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 6f8ca25..3870411 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2047,13 +2047,27 @@ static void virtio_queue_host_notifier_aio_read(EventNotifier *n) } } +static bool virtio_queue_host_notifier_aio_poll(void *opaque) +{ + EventNotifier *n = opaque; + VirtQueue *vq = container_of(n, VirtQueue, host_notifier); + + if (virtio_queue_empty(vq)) { + return false; + } + + virtio_queue_notify_aio_vq(vq); + return true; +} + void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, VirtIOHandleOutput handle_output) { if (handle_output) { vq->handle_aio_output = handle_output; aio_set_event_notifier(ctx, &vq->host_notifier, true, - virtio_queue_host_notifier_aio_read, NULL); + virtio_queue_host_notifier_aio_read, + virtio_queue_host_notifier_aio_poll); } else { aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL); /* Test and clear notifier before after disabling event,