From patchwork Tue Feb 5 08:21:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 10797011 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 661CF1390 for ; Tue, 5 Feb 2019 08:28:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 53FFB2B127 for ; Tue, 5 Feb 2019 08:28:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 47DC72B40F; Tue, 5 Feb 2019 08:28:46 +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 E3C892B127 for ; Tue, 5 Feb 2019 08:28:45 +0000 (UTC) Received: from localhost ([127.0.0.1]:56238 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gqw61-0006dH-78 for patchwork-qemu-devel@patchwork.kernel.org; Tue, 05 Feb 2019 03:28:45 -0500 Received: from eggs.gnu.org ([209.51.188.92]:52412) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gqvye-0000FP-B6 for qemu-devel@nongnu.org; Tue, 05 Feb 2019 03:21:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gqvyd-0000OM-I9 for qemu-devel@nongnu.org; Tue, 05 Feb 2019 03:21:08 -0500 Received: from mail.ispras.ru ([83.149.199.45]:33678) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gqvyd-0000NU-Aa for qemu-devel@nongnu.org; Tue, 05 Feb 2019 03:21:07 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 39D97540089; Tue, 5 Feb 2019 11:21:06 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Tue, 05 Feb 2019 11:21:07 +0300 Message-ID: <154935486729.7509.1713779951598019570.stgit@pasha-VirtualBox> In-Reply-To: <154935478086.7509.4349987292919289245.stgit@pasha-VirtualBox> References: <154935478086.7509.4349987292919289245.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 v12 15/25] 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 3fe14b5f57..d7e859d915 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 fa3b9d1a54..eea97b4a8f 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2702,6 +2702,12 @@ 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 8c15a41350..945802361b 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 */