From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 1628FC433E0 for ; Thu, 25 Mar 2021 15:12:22 +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 B5A4261A13 for ; Thu, 25 Mar 2021 15:12:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B5A4261A13 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:41802 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lPRem-0001mK-Og for qemu-devel@archiver.kernel.org; Thu, 25 Mar 2021 11:12:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35170) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPRaq-0005YP-EL for qemu-devel@nongnu.org; Thu, 25 Mar 2021 11:08:16 -0400 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:27659) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPRao-0007t2-O2 for qemu-devel@nongnu.org; Thu, 25 Mar 2021 11:08:16 -0400 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-442-cOBSHx8IPxaL5CvGhiu-8g-1; Thu, 25 Mar 2021 11:08:08 -0400 X-MC-Unique: cOBSHx8IPxaL5CvGhiu-8g-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 E2DFE1005D54; Thu, 25 Mar 2021 15:08:06 +0000 (UTC) Received: from bahia.redhat.com (ovpn-113-20.ams2.redhat.com [10.36.113.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4099E5C241; Thu, 25 Mar 2021 15:07:58 +0000 (UTC) From: Greg Kurz To: qemu-devel@nongnu.org Subject: [RFC 6/8] virtio-blk: Use virtio_bus_set_host_notifiers() Date: Thu, 25 Mar 2021 16:07:33 +0100 Message-Id: <20210325150735.1098387-7-groug@kaod.org> In-Reply-To: <20210325150735.1098387-1-groug@kaod.org> References: <20210325150735.1098387-1-groug@kaod.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=groug@kaod.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252 Received-SPF: softfail client-ip=205.139.111.44; envelope-from=groug@kaod.org; helo=us-smtp-delivery-44.mimecast.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no 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: Fam Zheng , Kevin Wolf , qemu-block@nongnu.org, "Michael S. Tsirkin" , Greg Kurz , Max Reitz , Stefan Hajnoczi , Paolo Bonzini , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This allows the virtio-blk-pci device to batch additions and deletions of host notifiers. This significantly improves boot time of VMs with a high number of vCPUs, e.g. from 3m26.408s down to 0m59.923s for a pseries machine with 384 vCPUs. Signed-off-by: Greg Kurz --- hw/block/dataplane/virtio-blk.c | 25 ++++++------------------- 1 file changed, 6 insertions(+), 19 deletions(-) diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-bl= k.c index d7b5c95d26d9..fd2a60010285 100644 --- a/hw/block/dataplane/virtio-blk.c +++ b/hw/block/dataplane/virtio-blk.c @@ -172,6 +172,7 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev) VirtIOBlockDataPlane *s =3D vblk->dataplane; BusState *qbus =3D BUS(qdev_get_parent_bus(DEVICE(vblk))); VirtioBusClass *k =3D VIRTIO_BUS_GET_CLASS(qbus); + VirtioBusState *bus =3D VIRTIO_BUS(qbus); AioContext *old_context; unsigned i; unsigned nvqs =3D s->conf->num_queues; @@ -199,16 +200,9 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev) } =20 /* Set up virtqueue notify */ - for (i =3D 0; i < nvqs; i++) { - r =3D virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, true); - if (r !=3D 0) { - fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n= ", r); - while (i--) { - virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); - virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); - } - goto fail_host_notifiers; - } + r =3D virtio_bus_set_host_notifiers(bus, nvqs, 0, true); + if (r !=3D 0) { + goto fail_host_notifiers; } =20 s->starting =3D false; @@ -246,10 +240,7 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev) return 0; =20 fail_aio_context: - for (i =3D 0; i < nvqs; i++) { - virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); - virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); - } + virtio_bus_set_host_notifiers(bus, nvqs, 0, false); fail_host_notifiers: k->set_guest_notifiers(qbus->parent, nvqs, false); fail_guest_notifiers: @@ -287,7 +278,6 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev) VirtIOBlockDataPlane *s =3D vblk->dataplane; BusState *qbus =3D qdev_get_parent_bus(DEVICE(vblk)); VirtioBusClass *k =3D VIRTIO_BUS_GET_CLASS(qbus); - unsigned i; unsigned nvqs =3D s->conf->num_queues; =20 if (!vblk->dataplane_started || s->stopping) { @@ -312,10 +302,7 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev) =20 aio_context_release(s->ctx); =20 - for (i =3D 0; i < nvqs; i++) { - virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); - virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); - } + virtio_bus_set_host_notifiers(VIRTIO_BUS(qbus), nvqs, 0, false); =20 qemu_bh_cancel(s->bh); notify_guest_bh(s); /* final chance to notify guest */ --=20 2.26.3