From patchwork Mon May 28 07:14:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 921336 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ispras.ru Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40vSv82mq9z9s0y for ; Mon, 28 May 2018 17:20:50 +1000 (AEST) Received: from localhost ([::1]:54556 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNCSV-0000vr-L1 for incoming@patchwork.ozlabs.org; Mon, 28 May 2018 03:20:47 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34534) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNCMT-0004y6-QB for qemu-devel@nongnu.org; Mon, 28 May 2018 03:14:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fNCMQ-0007dj-FS for qemu-devel@nongnu.org; Mon, 28 May 2018 03:14:33 -0400 Received: from mail.ispras.ru ([83.149.199.45]:46844) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNCMQ-0007cV-2J for qemu-devel@nongnu.org; Mon, 28 May 2018 03:14:30 -0400 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 2FAF75400E3; Mon, 28 May 2018 10:14:29 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Mon, 28 May 2018 10:14:30 +0300 Message-ID: <20180528071430.9424.63769.stgit@pasha-VirtualBox> In-Reply-To: <20180528071332.9424.27343.stgit@pasha-VirtualBox> References: <20180528071332.9424.27343.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 [fuzzy] X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v4 10/19] replay: implement replay-seek command to proceed to the desired step 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, quintela@redhat.com, ciro.santilli@gmail.com, jasowang@redhat.com, crosthwaite.peter@gmail.com, zuban32s@gmail.com, armbru@redhat.com, maria.klimushenkova@ispras.ru, mst@redhat.com, kraxel@redhat.com, boost.lists@gmail.com, thomas.dullien@googlemail.com, dovgaluk@ispras.ru, mreitz@redhat.com, alex.bennee@linaro.org, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds hmp/qmp commands replay_seek/replay-seek that proceed the execution to the specified step. The commands automatically loads nearest snapshot and replay the execution to find the desired step. Signed-off-by: Pavel Dovgalyuk --- v2: - renamed replay_seek qmp command into replay-seek (suggested by Eric Blake) --- hmp-commands.hx | 15 ++++++++ hmp.h | 1 + qapi/misc.json | 16 ++++++++ replay/replay-debugging.c | 89 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 121 insertions(+) diff --git a/hmp-commands.hx b/hmp-commands.hx index a6d3f12..3bd418e 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1864,6 +1864,21 @@ Execution stops when the specified step is reached. ETEXI { + .name = "replay_seek", + .args_type = "step:i", + .params = "step", + .help = "rewinds replay to the specified step", + .cmd = hmp_replay_seek, + }, + +STEXI +@item replay_seek @var{step} +@findex replay_seek +Automatically proceeds to the specified step, when replaying +the execution. +ETEXI + + { .name = "info", .args_type = "item:s?", .params = "[subcommand]", diff --git a/hmp.h b/hmp.h index c6b8e37..52ad7b9 100644 --- a/hmp.h +++ b/hmp.h @@ -148,5 +148,6 @@ void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict); void hmp_info_sev(Monitor *mon, const QDict *qdict); void hmp_info_replay(Monitor *mon, const QDict *qdict); void hmp_replay_break(Monitor *mon, const QDict *qdict); +void hmp_replay_seek(Monitor *mon, const QDict *qdict); #endif diff --git a/qapi/misc.json b/qapi/misc.json index b02e776..5f2604c 100644 --- a/qapi/misc.json +++ b/qapi/misc.json @@ -3150,6 +3150,22 @@ { 'command': 'replay-break', 'data': { 'step': 'int' } } ## +# @replay-seek: +# +# Automatically proceeds to the specified step, when replaying +# the execution. +# +# @step: destination execution step +# +# Since: 3.0 +# +# Example: +# +# -> { "execute": "replay-seek", "data": { "step": 220414 } } +## +{ 'command': 'replay-seek', 'data': { 'step': 'int' } } + +## # @xen-load-devices-state: # # Load the state of all devices from file. The RAM and the block devices diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 819017e..8d6c03d 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -18,6 +18,8 @@ #include "qapi/qapi-commands-misc.h" #include "qapi/qmp/qdict.h" #include "qemu/timer.h" +#include "block/snapshot.h" +#include "migration/snapshot.h" void hmp_info_replay(Monitor *mon, const QDict *qdict) { @@ -94,3 +96,90 @@ void hmp_replay_break(Monitor *mon, const QDict *qdict) return; } } + +static char *replay_find_nearest_snapshot(int64_t step, int64_t* snapshot_step) +{ + BlockDriverState *bs; + QEMUSnapshotInfo *sn_tab; + QEMUSnapshotInfo *nearest = NULL; + char *ret = NULL; + int nb_sns, i; + AioContext *aio_context; + + *snapshot_step = -1; + + bs = bdrv_all_find_vmstate_bs(); + if (!bs) { + goto fail; + } + aio_context = bdrv_get_aio_context(bs); + + aio_context_acquire(aio_context); + nb_sns = bdrv_snapshot_list(bs, &sn_tab); + aio_context_release(aio_context); + + for (i = 0; i < nb_sns; i++) { + if (bdrv_all_find_snapshot(sn_tab[i].name, &bs) == 0) { + if (sn_tab[i].icount != -1ULL + && sn_tab[i].icount <= step + && (!nearest || nearest->icount < sn_tab[i].icount)) { + nearest = &sn_tab[i]; + } + } + } + if (nearest) { + ret = g_strdup(nearest->name); + *snapshot_step = nearest->icount; + } + g_free(sn_tab); + +fail: + return ret; +} + +static void replay_seek(int64_t step, Error **errp, QEMUTimerCB callback) +{ + char *snapshot = NULL; + if (replay_mode != REPLAY_MODE_PLAY) { + error_setg(errp, "replay must be enabled to seek"); + return; + } + if (!replay_snapshot) { + error_setg(errp, "snapshotting is disabled"); + return; + } + int64_t snapshot_step = -1; + snapshot = replay_find_nearest_snapshot(step, &snapshot_step); + if (snapshot) { + if (step < replay_get_current_step() + || replay_get_current_step() < snapshot_step) { + vm_stop(RUN_STATE_RESTORE_VM); + load_snapshot(snapshot, errp); + } + g_free(snapshot); + } + if (replay_get_current_step() <= step) { + replay_break(step, callback, NULL); + vm_start(); + } else { + error_setg(errp, "cannot seek to the specified step"); + } +} + +void qmp_replay_seek(int64_t step, Error **errp) +{ + replay_seek(step, errp, replay_stop_vm); +} + +void hmp_replay_seek(Monitor *mon, const QDict *qdict) +{ + int64_t step = qdict_get_try_int(qdict, "step", -1LL); + Error *err = NULL; + + qmp_replay_seek(step, &err); + if (err) { + monitor_printf(mon, "replay_seek error: %s\n", error_get_pretty(err)); + error_free(err); + return; + } +}