From patchwork Fri Oct 23 15:21:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 270542 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=-7.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, MIME_BASE64_TEXT,SIGNED_OFF_BY,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 7C259C388F9 for ; Fri, 23 Oct 2020 15:53:26 +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 E7EBF20878 for ; Fri, 23 Oct 2020 15:53:25 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Fri, 23 Oct 2020 15:23:45 +0000 (UTC) Received: from localhost (ovpn-114-178.ams2.redhat.com [10.36.114.178]) by smtp.corp.redhat.com (Postfix) with ESMTP id A2D5019646; Fri, 23 Oct 2020 15:23:44 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL v3 22/28] block/export: add iothread and fixed-iothread options Date: Fri, 23 Oct 2020 16:21:41 +0100 Message-Id: <20201023152147.1016281-23-stefanha@redhat.com> In-Reply-To: <20201023152147.1016281-1-stefanha@redhat.com> References: <20201023152147.1016281-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/23 02:46:25 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 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, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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 , =?utf-8?q?D?= =?utf-8?q?aniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , qemu-block@nongnu.org, "Dr. David Alan Gilbert" , Coiby Xu , Markus Armbruster , Stefan Hajnoczi , Paolo Bonzini , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Make it possible to specify the iothread where the export will run. By default the block node can be moved to other AioContexts later and the export will follow. The fixed-iothread option forces strict behavior that prevents changing AioContext while the export is active. See the QAPI docs for details. Signed-off-by: Stefan Hajnoczi Message-id: 20200929125516.186715-5-stefanha@redhat.com [Fix stray '#' character in block-export.json and add missing "(since: 5.2)" as suggested by Eric Blake. --Stefan] Signed-off-by: Stefan Hajnoczi --- qapi/block-export.json | 11 ++++++++++ block/export/export.c | 31 +++++++++++++++++++++++++++- block/export/vhost-user-blk-server.c | 5 ++++- nbd/server.c | 2 -- 4 files changed, 45 insertions(+), 4 deletions(-) diff --git a/qapi/block-export.json b/qapi/block-export.json index a793e34af9..8a4ced817f 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -219,11 +219,22 @@ # export before completion is signalled. (since: 5.2; # default: false) # +# @iothread: The name of the iothread object where the export will run. The +# default is to use the thread currently associated with the +# block node. (since: 5.2) +# +# @fixed-iothread: True prevents the block node from being moved to another +# thread while the export is active. If true and @iothread is +# given, export creation fails if the block node cannot be +# moved to the iothread. The default is false. (since: 5.2) +# # Since: 4.2 ## { 'union': 'BlockExportOptions', 'base': { 'type': 'BlockExportType', 'id': 'str', + '*fixed-iothread': 'bool', + '*iothread': 'str', 'node-name': 'str', '*writable': 'bool', '*writethrough': 'bool' }, diff --git a/block/export/export.c b/block/export/export.c index a24fadcfb5..c3478c6c97 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -15,6 +15,7 @@ #include "block/block.h" #include "sysemu/block-backend.h" +#include "sysemu/iothread.h" #include "block/export.h" #include "block/nbd.h" #include "qapi/error.h" @@ -63,10 +64,11 @@ static const BlockExportDriver *blk_exp_find_driver(BlockExportType type) BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp) { + bool fixed_iothread = export->has_fixed_iothread && export->fixed_iothread; const BlockExportDriver *drv; BlockExport *exp = NULL; BlockDriverState *bs; - BlockBackend *blk; + BlockBackend *blk = NULL; AioContext *ctx; uint64_t perm; int ret; @@ -102,6 +104,28 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp) ctx = bdrv_get_aio_context(bs); aio_context_acquire(ctx); + if (export->has_iothread) { + IOThread *iothread; + AioContext *new_ctx; + + iothread = iothread_by_id(export->iothread); + if (!iothread) { + error_setg(errp, "iothread \"%s\" not found", export->iothread); + goto fail; + } + + new_ctx = iothread_get_aio_context(iothread); + + ret = bdrv_try_set_aio_context(bs, new_ctx, errp); + if (ret == 0) { + aio_context_release(ctx); + aio_context_acquire(new_ctx); + ctx = new_ctx; + } else if (fixed_iothread) { + goto fail; + } + } + /* * Block exports are used for non-shared storage migration. Make sure * that BDRV_O_INACTIVE is cleared and the image is ready for write @@ -116,6 +140,11 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp) } blk = blk_new(ctx, perm, BLK_PERM_ALL); + + if (!fixed_iothread) { + blk_set_allow_aio_context_change(blk, true); + } + ret = blk_insert_bs(blk, bs, errp); if (ret < 0) { goto fail; diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user-blk-server.c index f7021cbd7b..286eb5fb9a 100644 --- a/block/export/vhost-user-blk-server.c +++ b/block/export/vhost-user-blk-server.c @@ -323,13 +323,17 @@ static const VuDevIface vu_blk_iface = { static void blk_aio_attached(AioContext *ctx, void *opaque) { VuBlkExport *vexp = opaque; + + vexp->export.ctx = ctx; vhost_user_server_attach_aio_context(&vexp->vu_server, ctx); } static void blk_aio_detach(void *opaque) { VuBlkExport *vexp = opaque; + vhost_user_server_detach_aio_context(&vexp->vu_server); + vexp->export.ctx = NULL; } static void @@ -384,7 +388,6 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, vu_blk_initialize_config(blk_bs(exp->blk), &vexp->blkcfg, logical_block_size); - blk_set_allow_aio_context_change(exp->blk, true); blk_add_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach, vexp); diff --git a/nbd/server.c b/nbd/server.c index e75c825879..08b621f70a 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1517,8 +1517,6 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args, return ret; } - blk_set_allow_aio_context_change(blk, true); - QTAILQ_INIT(&exp->clients); exp->name = g_strdup(arg->name); exp->description = g_strdup(arg->description);