From nobody Fri Oct 24 21:59:47 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 151972576356977.61159053220354; Tue, 27 Feb 2018 02:02:43 -0800 (PST) Received: from localhost ([::1]:35865 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eqc5q-0001hQ-BG for importer@patchew.org; Tue, 27 Feb 2018 05:02:42 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39836) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eqbwm-0001sS-9L for qemu-devel@nongnu.org; Tue, 27 Feb 2018 04:53:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eqbwi-0005HO-D2 for qemu-devel@nongnu.org; Tue, 27 Feb 2018 04:53:20 -0500 Received: from mail.ispras.ru ([83.149.199.45]:57574) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eqbwi-0005HF-4B for qemu-devel@nongnu.org; Tue, 27 Feb 2018 04:53:16 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 1C08154006A; Tue, 27 Feb 2018 12:53:15 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Tue, 27 Feb 2018 12:53:16 +0300 Message-ID: <20180227095316.1060.4134.stgit@pasha-VirtualBox> In-Reply-To: <20180227095135.1060.36549.stgit@pasha-VirtualBox> References: <20180227095135.1060.36549.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] [PATCH v7 18/22] 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, war2jordan@live.com, pavel.dovgaluk@ispras.ru, quintela@redhat.com, ciro.santilli@gmail.com, jasowang@redhat.com, mst@redhat.com, zuban32s@gmail.com, maria.klimushenkova@ispras.ru, dovgaluk@ispras.ru, kraxel@redhat.com, boost.lists@gmail.com, thomas.dullien@googlemail.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 warped 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 -- v4: added assert for replay_save_events function --- replay/replay-events.c | 1 + replay/replay.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/replay/replay-events.c b/replay/replay-events.c index 54dd9d2..3d5fc8a 100644 --- a/replay/replay-events.c +++ b/replay/replay-events.c @@ -205,6 +205,7 @@ static void replay_save_event(Event *event, int checkpo= int) void replay_save_events(int checkpoint) { g_assert(replay_mutex_locked()); + g_assert(checkpoint !=3D CHECKPOINT_CLOCK_WARP_START); while (!QTAILQ_EMPTY(&events_list)) { Event *event =3D QTAILQ_FIRST(&events_list); replay_save_event(event, checkpoint); diff --git a/replay/replay.c b/replay/replay.c index d5c3a66..19721b0 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: