From patchwork Tue Aug 11 11:01:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 276752 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=-10.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 54649C433E0 for ; Tue, 11 Aug 2020 11:03:56 +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 26C362075D for ; Tue, 11 Aug 2020 11:03:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 26C362075D 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]:56530 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k5S4R-0007O0-DG for qemu-devel@archiver.kernel.org; Tue, 11 Aug 2020 07:03:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46306) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k5S2Q-0003hl-A1 for qemu-devel@nongnu.org; Tue, 11 Aug 2020 07:01:50 -0400 Received: from mail.ispras.ru ([83.149.199.84]:42406) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k5S2N-0003Nv-TS for qemu-devel@nongnu.org; Tue, 11 Aug 2020 07:01:49 -0400 Received: from [127.0.1.1] (unknown [62.118.151.149]) by mail.ispras.ru (Postfix) with ESMTPSA id 73FCC4089F07; Tue, 11 Aug 2020 11:01:45 +0000 (UTC) Subject: [PATCH v2 09/14] replay: implement replay-seek command From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Tue, 11 Aug 2020 14:01:45 +0300 Message-ID: <159714370522.18946.4046018214444656193.stgit@pasha-ThinkPad-X280> In-Reply-To: <159714365354.18946.2967871683340522027.stgit@pasha-ThinkPad-X280> References: <159714365354.18946.2967871683340522027.stgit@pasha-ThinkPad-X280> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Received-SPF: pass client-ip=83.149.199.84; envelope-from=pavel.dovgalyuk@ispras.ru; helo=mail.ispras.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/11 07:00:54 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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, wrampazz@redhat.com, pavel.dovgalyuk@ispras.ru, ehabkost@redhat.com, alex.bennee@linaro.org, mtosatti@redhat.com, armbru@redhat.com, mreitz@redhat.com, stefanha@redhat.com, crosa@redhat.com, pbonzini@redhat.com, philmd@redhat.com, zhiwei_liu@c-sky.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Pavel Dovgalyuk This patch adds hmp/qmp commands replay_seek/replay-seek that proceed the execution to the specified instruction count. The command automatically loads nearest snapshot and replays the execution to find the desired instruction count. Signed-off-by: Pavel Dovgalyuk Acked-by: Markus Armbruster --- hmp-commands.hx | 18 +++++++++ include/monitor/hmp.h | 1 qapi/replay.json | 20 ++++++++++ replay/replay-debugging.c | 92 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 131 insertions(+) diff --git a/hmp-commands.hx b/hmp-commands.hx index e8ce385879..4288274c4e 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1851,6 +1851,24 @@ SRST The command is ignored when there are no replay breakpoints. ERST + { + .name = "replay_seek", + .args_type = "icount:i", + .params = "icount", + .help = "replay execution to the specified instruction count", + .cmd = hmp_replay_seek, + }, + +SRST +``replay_seek`` *icount* +Automatically proceed to the instruction count *icount*, when +replaying the execution. The command automatically loads nearest +snapshot and replays the execution to find the desired instruction. +When there is no preceding snapshot or the execution is not replayed, +then the command fails. +*icount* for the reference may be observed with ``info replay`` command. +ERST + { .name = "info", .args_type = "item:s?", diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h index 21849bdda5..655eb81a4c 100644 --- a/include/monitor/hmp.h +++ b/include/monitor/hmp.h @@ -133,5 +133,6 @@ 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_delete_break(Monitor *mon, const QDict *qdict); +void hmp_replay_seek(Monitor *mon, const QDict *qdict); #endif diff --git a/qapi/replay.json b/qapi/replay.json index 173ba76107..bfd83d7591 100644 --- a/qapi/replay.json +++ b/qapi/replay.json @@ -99,3 +99,23 @@ # ## { 'command': 'replay-delete-break' } + +## +# @replay-seek: +# +# Automatically proceed to the instruction count @icount, when +# replaying the execution. The command automatically loads nearest +# snapshot and replays the execution to find the desired instruction. +# When there is no preceding snapshot or the execution is not replayed, +# then the command fails. +# icount for the reference may be obtained with @query-replay command. +# +# @icount: target instruction count +# +# Since: 5.2 +# +# Example: +# +# -> { "execute": "replay-seek", "data": { "icount": 220414 } } +## +{ 'command': 'replay-seek', 'data': { 'icount': 'int' } } diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 86e19bb217..cfd0221692 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -19,6 +19,8 @@ #include "qapi/qapi-commands-replay.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) { @@ -127,3 +129,93 @@ void hmp_replay_delete_break(Monitor *mon, const QDict *qdict) return; } } + +static char *replay_find_nearest_snapshot(int64_t icount, + int64_t *snapshot_icount) +{ + BlockDriverState *bs; + QEMUSnapshotInfo *sn_tab; + QEMUSnapshotInfo *nearest = NULL; + char *ret = NULL; + int nb_sns, i; + AioContext *aio_context; + + *snapshot_icount = -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 <= icount + && (!nearest || nearest->icount < sn_tab[i].icount)) { + nearest = &sn_tab[i]; + } + } + } + if (nearest) { + ret = g_strdup(nearest->name); + *snapshot_icount = nearest->icount; + } + g_free(sn_tab); + +fail: + return ret; +} + +static void replay_seek(int64_t icount, QEMUTimerCB callback, Error **errp) +{ + char *snapshot = NULL; + int64_t snapshot_icount; + + 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; + } + + snapshot = replay_find_nearest_snapshot(icount, &snapshot_icount); + if (snapshot) { + if (icount < replay_get_current_icount() + || replay_get_current_icount() < snapshot_icount) { + vm_stop(RUN_STATE_RESTORE_VM); + load_snapshot(snapshot, errp); + } + g_free(snapshot); + } + if (replay_get_current_icount() <= icount) { + replay_break(icount, callback, NULL); + vm_start(); + } else { + error_setg(errp, "cannot seek to the specified instruction count"); + } +} + +void qmp_replay_seek(int64_t icount, Error **errp) +{ + replay_seek(icount, replay_stop_vm, errp); +} + +void hmp_replay_seek(Monitor *mon, const QDict *qdict) +{ + int64_t icount = qdict_get_try_int(qdict, "icount", -1LL); + Error *err = NULL; + + qmp_replay_seek(icount, &err); + if (err) { + error_report_err(err); + error_free(err); + return; + } +}