From patchwork Mon Dec 14 17:05:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergio Lopez Pascual X-Patchwork-Id: 11972509 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,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 9B594C4361B for ; Mon, 14 Dec 2020 17:11:28 +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 F06B622512 for ; Mon, 14 Dec 2020 17:11:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F06B622512 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]:42660 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1korNe-0000Ar-V5 for qemu-devel@archiver.kernel.org; Mon, 14 Dec 2020 12:11:26 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52918) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1korI6-0001U7-B1 for qemu-devel@nongnu.org; Mon, 14 Dec 2020 12:05:42 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:33276) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1korI3-0005UE-Qx for qemu-devel@nongnu.org; Mon, 14 Dec 2020 12:05:42 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1607965539; 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; bh=Ofxiw979EA5hQ5retJsvejrszYOaT4OA8K7Ptz7ohEw=; b=EM+I3GCCGzu2Jh5GVGP+ES/Px4uajrYiH2e9bSfM7auj49BzuxhzzWCS3IKMkrca4qTmQk pG+LNCgJrul0q1TQlGd3J3aFA/w1pcf+re9vL4YK5HYw33M7h201QnbRRaDuKZg4p+6K6U MPn095yyND9NAwic6TghobVpESBhXUY= 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-490-gNP_Li97NzyoS-gY09zc6A-1; Mon, 14 Dec 2020 12:05:35 -0500 X-MC-Unique: gNP_Li97NzyoS-gY09zc6A-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F0CE11074640; Mon, 14 Dec 2020 17:05:33 +0000 (UTC) Received: from toolbox.redhat.com (ovpn-112-231.rdu2.redhat.com [10.10.112.231]) by smtp.corp.redhat.com (Postfix) with ESMTP id 02D775D6AB; Mon, 14 Dec 2020 17:05:20 +0000 (UTC) From: Sergio Lopez To: qemu-devel@nongnu.org Subject: [PATCH v2 0/4] nbd/server: Quiesce coroutines on context switch Date: Mon, 14 Dec 2020 18:05:15 +0100 Message-Id: <20201214170519.223781-1-slp@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=slp@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=slp@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=unavailable 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: Kevin Wolf , Fam Zheng , Stefano Stabellini , Sergio Lopez , qemu-block@nongnu.org, Paul Durrant , "Michael S. Tsirkin" , Max Reitz , Stefan Hajnoczi , Paolo Bonzini , Anthony Perard , xen-devel@lists.xenproject.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This series allows the NBD server to properly switch between AIO contexts, having quiesced recv_coroutine and send_coroutine before doing the transition. We need this because we send back devices running in IO Thread owned contexts to the main context when stopping the data plane, something that can happen multiple times during the lifetime of a VM (usually during the boot sequence or on a reboot), and we drag the NBD server of the correspoing export with it. While there, fix also a problem caused by a cross-dependency between closing the export's client connections and draining the block layer. The visible effect of this problem was QEMU getting hung when the guest request a power off while there's an active NBD client. v2: - Replace "virtio-blk: Acquire context while switching them on dataplane start" with "block: Honor blk_set_aio_context() context requirements" (Kevin Wolf) - Add "block: Avoid processing BDS twice in bdrv_set_aio_context_ignore()" - Add "block: Close block exports in two steps" - Rename nbd_read_eof() to nbd_server_read_eof() (Eric Blake) - Fix double space and typo in comment. (Eric Blake) Sergio Lopez (4): block: Honor blk_set_aio_context() context requirements block: Avoid processing BDS twice in bdrv_set_aio_context_ignore() nbd/server: Quiesce coroutines on context switch block: Close block exports in two steps block.c | 27 ++++++- block/export/export.c | 10 +-- blockdev-nbd.c | 2 +- hw/block/dataplane/virtio-blk.c | 4 ++ hw/block/dataplane/xen-block.c | 7 +- hw/scsi/virtio-scsi.c | 6 +- include/block/export.h | 4 +- nbd/server.c | 120 ++++++++++++++++++++++++++++---- qemu-nbd.c | 2 +- stubs/blk-exp-close-all.c | 2 +- 10 files changed, 156 insertions(+), 28 deletions(-)