From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 604C9C32771 for ; Thu, 9 Jan 2020 06:14:06 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 34B4120673 for ; Thu, 9 Jan 2020 06:14:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34B4120673 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=ispras.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56090 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipR53-0006sT-AG for qemu-devel@archiver.kernel.org; Thu, 09 Jan 2020 01:14:05 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:40540) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipR4J-0006EQ-Tx for qemu-devel@nongnu.org; Thu, 09 Jan 2020 01:13:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ipR4G-0007qq-VO for qemu-devel@nongnu.org; Thu, 09 Jan 2020 01:13:19 -0500 Received: from mail.ispras.ru ([83.149.199.45]:53844) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ipR4G-0007el-G3 for qemu-devel@nongnu.org; Thu, 09 Jan 2020 01:13:16 -0500 Received: from PASHAISP (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 07925A2201; Thu, 9 Jan 2020 09:13:11 +0300 (MSK) From: "Pavel Dovgalyuk" To: "'Pavel Dovgalyuk'" , References: <157709434917.12933.4351155074716553976.stgit@pasha-Precision-3630-Tower> In-Reply-To: <157709434917.12933.4351155074716553976.stgit@pasha-Precision-3630-Tower> Subject: RE: [for-5.0 PATCH 00/11] Support for reverse debugging with GDB Date: Thu, 9 Jan 2020 09:13:11 +0300 Message-ID: <003a01d5c6b3$df62afd0$9e280f70$@ru> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdW5dchLWdUIxCsjSTynAOt3PgDYHANPhEXQ Content-Language: ru X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 83.149.199.45 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 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, quintela@redhat.com, ciro.santilli@gmail.com, jasowang@redhat.com, crosthwaite.peter@gmail.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, pbonzini@redhat.com, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Ping. Pavel Dovgalyuk > -----Original Message----- > From: Pavel Dovgalyuk [mailto:pavel.dovgaluk@gmail.com] > Sent: Monday, December 23, 2019 12:46 PM > To: qemu-devel@nongnu.org > Cc: kwolf@redhat.com; peter.maydell@linaro.org; crosthwaite.peter@gmail.com; > boost.lists@gmail.com; artem.k.pisarenko@gmail.com; quintela@redhat.com; > ciro.santilli@gmail.com; jasowang@redhat.com; mst@redhat.com; armbru@redhat.com; > mreitz@redhat.com; maria.klimushenkova@ispras.ru; dovgaluk@ispras.ru; kraxel@redhat.com; > pavel.dovgaluk@ispras.ru; thomas.dullien@googlemail.com; pbonzini@redhat.com; > alex.bennee@linaro.org; dgilbert@redhat.com; rth@twiddle.net > Subject: [for-5.0 PATCH 00/11] Support for reverse debugging with GDB > > GDB remote protocol supports reverse debugging of the targets. > It includes 'reverse step' and 'reverse continue' operations. > The first one finds the previous step of the execution, > and the second one is intended to stop at the last breakpoint that > would happen when the program is executed normally. > > Reverse debugging is possible in the replay mode, when at least > one snapshot was created at the record or replay phase. > QEMU can use these snapshots for travelling back in time with GDB. > > Running the execution in replay mode allows using GDB reverse debugging > commands: > - reverse-stepi (or rsi): Steps one instruction to the past. > QEMU loads on of the prior snapshots and proceeds to the desired > instruction forward. When that step is reaches, execution stops. > - reverse-continue (or rc): Runs execution "backwards". > QEMU tries to find breakpoint or watchpoint by loaded prior snapshot > and replaying the execution. Then QEMU loads snapshots again and > replays to the latest breakpoint. When there are no breakpoints in > the examined section of the execution, QEMU finds one more snapshot > and tries again. After the first snapshot is processed, execution > stops at this snapshot. > > The set of patches include the following modifications: > - gdbstub update for reverse debugging support > - functions that automatically perform reverse step and reverse > continue operations > - hmp/qmp commands for manipulating the replay process > - improvement of the snapshotting for saving the execution step > in the snapshot parameters > > The patches are available in the repository: > https://github.com/ispras/qemu/tree/rr-191223 > > --- > > Pavel Dovgaluk (11): > replay: provide an accessor for rr filename > qcow2: introduce icount field for snapshots > migration: introduce icount field for snapshots > qapi: introduce replay.json for record/replay-related stuff > replay: introduce info hmp/qmp command > replay: introduce breakpoint at the specified step > replay: implement replay-seek command > replay: flush rr queue before loading the vmstate > gdbstub: add reverse step support in replay mode > gdbstub: add reverse continue support in replay mode > replay: describe reverse debugging in docs/replay.txt > > > MAINTAINERS | 1 > accel/tcg/translator.c | 1 > block/qapi.c | 18 ++ > block/qcow2-snapshot.c | 9 + > block/qcow2.h | 3 > blockdev.c | 10 + > cpus.c | 19 ++- > docs/interop/qcow2.txt | 4 + > docs/replay.txt | 33 +++++ > exec.c | 8 + > gdbstub.c | 64 ++++++++- > hmp-commands-info.hx | 14 ++ > hmp-commands.hx | 53 +++++++ > include/block/snapshot.h | 1 > include/monitor/hmp.h | 4 + > include/sysemu/replay.h | 24 +++ > migration/savevm.c | 17 ++ > qapi/Makefile.objs | 2 > qapi/block-core.json | 8 + > qapi/block.json | 3 > qapi/misc.json | 18 -- > qapi/qapi-schema.json | 1 > qapi/replay.json | 121 +++++++++++++++++ > replay/Makefile.objs | 1 > replay/replay-debugging.c | 325 +++++++++++++++++++++++++++++++++++++++++++++ > replay/replay-internal.h | 6 + > replay/replay.c | 22 +++ > stubs/replay.c | 10 + > 28 files changed, 761 insertions(+), 39 deletions(-) > create mode 100644 qapi/replay.json > create mode 100644 replay/replay-debugging.c > > -- > Pavel Dovgalyuk