From patchwork Thu Dec 21 19:24:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13502591 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 8FAE4C35274 for ; Thu, 21 Dec 2023 19:25:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rGOfc-0001TY-6n; Thu, 21 Dec 2023 14:25:25 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rGOfY-0001Si-Lm for qemu-devel@nongnu.org; Thu, 21 Dec 2023 14:25:20 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rGOfJ-0001qf-3M for qemu-devel@nongnu.org; Thu, 21 Dec 2023 14:25:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703186702; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mLpAPhOLexRIuQHAy6nH/DLSJaRi5up7/+uWx1QOq3Y=; b=SHHzbMwoLEUWHauPg8t3ZcmNR0qy5WA54120xvi+Q/A2RJXYP0cIzOMUlqXlO8/uz4zT3O scVLY7N1K1S0WZTwZnEMlDjYiptSgyaSbl/Lh/p+d3KcSm/Ea+wLSg/D6Q+eic9+9iwnls ES6DOh05yPoY0R6kx2mFqQW6Z81oAJc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-130-qMZVZiXKN-KeHB0bXhtY1A-1; Thu, 21 Dec 2023 14:24:59 -0500 X-MC-Unique: qMZVZiXKN-KeHB0bXhtY1A-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D056E101A551; Thu, 21 Dec 2023 19:24:58 +0000 (UTC) Received: from localhost (unknown [10.39.194.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1C2621121313; Thu, 21 Dec 2023 19:24:57 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org, Kevin Wolf Cc: Juan Quintela , Vladimir Sementsov-Ogievskiy , pbonzini@redhat.com, Peter Xu , qemu-block@nongnu.org, Hanna Reitz , Fabiano Rosas , Leonardo Bras , Eric Blake , Stefan Hajnoczi , Fam Zheng Subject: [PATCH v3 2/6] fixup block: remove AioContext locking Date: Thu, 21 Dec 2023 14:24:48 -0500 Message-ID: <20231221192452.1785567-3-stefanha@redhat.com> In-Reply-To: <20231221192452.1785567-1-stefanha@redhat.com> References: <20231221192452.1785567-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.061, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_HELO_TEMPERROR=0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Signed-off-by: Stefan Hajnoczi --- migration/block.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/migration/block.c b/migration/block.c index 2bcfcbfdf6..6ec6a1d6e6 100644 --- a/migration/block.c +++ b/migration/block.c @@ -311,10 +311,17 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds) block_mig_state.submitted++; blk_mig_unlock(); + /* + * The migration thread does not have an AioContext. Lock the BQL so that + * I/O runs in the main loop AioContext (see + * qemu_get_current_aio_context()). + */ + qemu_mutex_lock_iothread(); bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE, nr_sectors * BDRV_SECTOR_SIZE); blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov, 0, blk_mig_read_cb, blk); + qemu_mutex_unlock_iothread(); bmds->cur_sector = cur_sector + nr_sectors; return (bmds->cur_sector >= total_sectors);