From nobody Tue Oct 28 01:48:46 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1515660465191689.9663633676205; Thu, 11 Jan 2018 00:47:45 -0800 (PST) Received: from localhost ([::1]:53359 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZYWW-0002Iz-9L for importer@patchew.org; Thu, 11 Jan 2018 03:47:44 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47741) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZYDA-0001jh-D2 for qemu-devel@nongnu.org; Thu, 11 Jan 2018 03:27:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZYD9-000334-Gw for qemu-devel@nongnu.org; Thu, 11 Jan 2018 03:27:44 -0500 Received: from mail.ispras.ru ([83.149.199.45]:42110) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZYD9-00032N-91 for qemu-devel@nongnu.org; Thu, 11 Jan 2018 03:27:43 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 6923E54006B; Thu, 11 Jan 2018 11:27:42 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Thu, 11 Jan 2018 11:27:44 +0300 Message-ID: <20180111082744.27295.25934.stgit@pasha-VirtualBox> In-Reply-To: <20180111082452.27295.85707.stgit@pasha-VirtualBox> References: <20180111082452.27295.85707.stgit@pasha-VirtualBox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [RFC PATCH v3 30/30] replay: don't process async events when warping the clock 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, pavel.dovgaluk@ispras.ru, mst@redhat.com, jasowang@redhat.com, quintela@redhat.com, zuban32s@gmail.com, maria.klimushenkova@ispras.ru, dovgaluk@ispras.ru, kraxel@redhat.com, boost.lists@gmail.com, pbonzini@redhat.com, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Virtual clock is wapred from iothread and vcpu thread. When the hardware events associated with warp checkpoint, then interrupt delivering may be non-deterministic if checkpoint is processed in different threads in record and replay. This patch disables event processing for clock warp checkpoint and leaves all hardware events to other checkpoints (e.g., virtual clock). Signed-off-by: Pavel Dovgalyuk --- replay/replay.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/replay/replay.c b/replay/replay.c index b9c496a..cc43c38 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -211,7 +211,12 @@ bool replay_checkpoint(ReplayCheckpoint checkpoint) } else if (replay_mode =3D=3D REPLAY_MODE_RECORD) { g_assert(replay_mutex_locked()); replay_put_event(EVENT_CHECKPOINT + checkpoint); - replay_save_events(checkpoint); + /* This checkpoint belongs to several threads. + Processing events from different threads is + non-deterministic */ + if (checkpoint !=3D CHECKPOINT_CLOCK_WARP_START) { + replay_save_events(checkpoint); + } res =3D true; } out: