From patchwork Thu Jan 17 07:38:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 10767691 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B2C07139A for ; Thu, 17 Jan 2019 07:58:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A118729242 for ; Thu, 17 Jan 2019 07:58:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 901302AB24; Thu, 17 Jan 2019 07:58:21 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 35C3729242 for ; Thu, 17 Jan 2019 07:58:21 +0000 (UTC) Received: from localhost ([127.0.0.1]:38189 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gk2ZA-0005hY-IS for patchwork-qemu-devel@patchwork.kernel.org; Thu, 17 Jan 2019 02:58:20 -0500 Received: from eggs.gnu.org ([209.51.188.92]:43139) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gk2Fh-0006Vq-US for qemu-devel@nongnu.org; Thu, 17 Jan 2019 02:38:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gk2Fh-0003Oa-4y for qemu-devel@nongnu.org; Thu, 17 Jan 2019 02:38:13 -0500 Received: from mail.ispras.ru ([83.149.199.45]:57842) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gk2Fg-0003OB-TA for qemu-devel@nongnu.org; Thu, 17 Jan 2019 02:38:13 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 07151540081; Thu, 17 Jan 2019 10:38:12 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Thu, 17 Jan 2019 10:38:16 +0300 Message-ID: <20190117073816.5399.67791.stgit@pasha-VirtualBox> In-Reply-To: <20190117073649.5399.97670.stgit@pasha-VirtualBox> References: <20190117073649.5399.97670.stgit@pasha-VirtualBox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v10 15/24] replay: flush rr queue before loading the vmstate 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: kwolf@redhat.com, peter.maydell@linaro.org, war2jordan@live.com, pavel.dovgaluk@ispras.ru, pbonzini@redhat.com, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.com, armbru@redhat.com, mreitz@redhat.com, alex.bennee@linaro.org, maria.klimushenkova@ispras.ru, mst@redhat.com, kraxel@redhat.com, boost.lists@gmail.com, thomas.dullien@googlemail.com, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Non-empty record/replay queue prevents saving and loading the VM state, because it includes pending bottom halves and block coroutines. But when the new VM state is loaded, we don't have to preserve the consistency of the current state anymore. Therefore this patch just flushes the queue allowing the coroutines to finish. Signed-off-by: Pavel Dovgalyuk --- include/sysemu/replay.h | 2 ++ migration/savevm.c | 6 ++++++ replay/replay-internal.h | 2 -- 3 files changed, 8 insertions(+), 2 deletions(-) diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 3fe14b5..d7e859d 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -140,6 +140,8 @@ void replay_disable_events(void); void replay_enable_events(void); /*! Returns true when saving events is enabled */ bool replay_events_enabled(void); +/* Flushes events queue */ +void replay_flush_events(void); /*! Adds bottom half event to the queue */ void replay_bh_schedule_event(QEMUBH *bh); /*! Adds input event to the queue */ diff --git a/migration/savevm.c b/migration/savevm.c index a031e5b..5a9902d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2701,6 +2701,12 @@ int load_snapshot(const char *name, Error **errp) return -EINVAL; } + /* + * Flush the record/replay queue. Now the VM state is going + * to change. Therefore we don't need to preserve its consistency + */ + replay_flush_events(); + /* Flush all IO requests so they don't interfere with the new state. */ bdrv_drain_all_begin(); diff --git a/replay/replay-internal.h b/replay/replay-internal.h index 8c15a41..9458023 100644 --- a/replay/replay-internal.h +++ b/replay/replay-internal.h @@ -146,8 +146,6 @@ void replay_read_next_clock(unsigned int kind); void replay_init_events(void); /*! Clears internal data structures for events handling */ void replay_finish_events(void); -/*! Flushes events queue */ -void replay_flush_events(void); /*! Returns true if there are any unsaved events in the queue */ bool replay_has_events(void); /*! Saves events from queue into the file */