From patchwork Wed Jan 9 12:11:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022393 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSmD3tllz9sMr for ; Wed, 9 Jan 2019 23:16:44 +1100 (AEDT) Received: from localhost ([127.0.0.1]:47227 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCmo-0006lu-4v for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:16:42 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33037) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChs-00033J-IP for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:37 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghChr-0001HU-Oi for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:36 -0500 Received: from mail.ispras.ru ([83.149.199.45]:36988) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChr-0001CL-FQ for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:35 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id E6C8B54006B; Wed, 9 Jan 2019 15:11:24 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:24 +0300 Message-ID: <154703588477.13472.922361601769249149.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 01/21] replay: add missing fix for internal function 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: pbonzini@redhat.com This is a fix which was missed by patch 74c0b816adfc6aa1b01b4426fdf385e32e35cbac, which added current_step parameter to the replay_advance_current_step function. Signed-off-by: Pavel Dovgalyuk --- replay/replay-internal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/replay/replay-internal.c b/replay/replay-internal.c index 8f87e9b..7e6de03 100644 --- a/replay/replay-internal.c +++ b/replay/replay-internal.c @@ -229,7 +229,7 @@ void replay_mutex_unlock(void) void replay_advance_current_step(uint64_t current_step) { - int diff = (int)(replay_get_current_step() - replay_state.current_step); + int diff = (int)(current_step - replay_state.current_step); /* Time can only go forward */ assert(diff >= 0); From patchwork Wed Jan 9 12:11:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022389 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZShf0Bxsz9s2P for ; Wed, 9 Jan 2019 23:13:38 +1100 (AEDT) Received: from localhost ([127.0.0.1]:46383 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjn-00043g-Ux for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:13:36 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33040) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChs-00033L-Iw for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:37 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghChr-0001HP-Oe for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:36 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37016) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChr-0001DM-FM for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:35 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id B60F8540081; Wed, 9 Jan 2019 15:11:30 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:30 +0300 Message-ID: <154703589062.13472.6598991819636301041.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 02/21] block: implement bdrv_snapshot_goto for blkreplay 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Pavel Dovgalyuk This patch enables making snapshots with blkreplay used in block devices. This function is required to make bdrv_snapshot_goto without calling .bdrv_open which is not implemented. Signed-off-by: Pavel Dovgalyuk --- block/blkreplay.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/block/blkreplay.c b/block/blkreplay.c index b5d9efd..142dfe3 100644 --- a/block/blkreplay.c +++ b/block/blkreplay.c @@ -126,6 +126,12 @@ static int coroutine_fn blkreplay_co_flush(BlockDriverState *bs) return ret; } +static int blkreplay_snapshot_goto(BlockDriverState *bs, + const char *snapshot_id) +{ + return bdrv_snapshot_goto(bs->file->bs, snapshot_id, NULL); +} + static BlockDriver bdrv_blkreplay = { .format_name = "blkreplay", .instance_size = 0, @@ -140,6 +146,8 @@ static BlockDriver bdrv_blkreplay = { .bdrv_co_pwrite_zeroes = blkreplay_co_pwrite_zeroes, .bdrv_co_pdiscard = blkreplay_co_pdiscard, .bdrv_co_flush = blkreplay_co_flush, + + .bdrv_snapshot_goto = blkreplay_snapshot_goto, }; static void bdrv_blkreplay_init(void) From patchwork Wed Jan 9 12:11:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022386 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSgH1fvKz9sN4 for ; Wed, 9 Jan 2019 23:12:27 +1100 (AEDT) Received: from localhost ([127.0.0.1]:46073 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCif-000387-5b for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:12:25 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33079) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChv-000356-SM for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCht-0001Jc-TD for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:39 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37040) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCht-0001JQ-Ll for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:37 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id A443154006A; Wed, 9 Jan 2019 15:11:36 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:36 +0300 Message-ID: <154703589647.13472.15561310749671136184.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 03/21] replay: disable default snapshot for record/replay 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Pavel Dovgalyuk This patch disables setting '-snapshot' option on by default in record/replay mode. This is needed for creating vmstates in record and replay modes. Signed-off-by: Pavel Dovgalyuk --- vl.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/vl.c b/vl.c index 064872c..7de4f55 100644 --- a/vl.c +++ b/vl.c @@ -3196,7 +3196,13 @@ int main(int argc, char **argv, char **envp) drive_add(IF_PFLASH, -1, optarg, PFLASH_OPTS); break; case QEMU_OPTION_snapshot: - snapshot = 1; + { + Error *blocker = NULL; + snapshot = 1; + error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED, + "-snapshot"); + replay_add_blocker(blocker); + } break; case QEMU_OPTION_numa: opts = qemu_opts_parse_noisily(qemu_find_opts("numa"), @@ -4472,7 +4478,7 @@ int main(int argc, char **argv, char **envp) qapi_free_BlockdevOptions(bdo->bdo); g_free(bdo); } - if (snapshot || replay_mode != REPLAY_MODE_NONE) { + if (snapshot) { qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, NULL, NULL); } From patchwork Wed Jan 9 12:11:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022390 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSkn2ZqDz9s2P for ; Wed, 9 Jan 2019 23:15:29 +1100 (AEDT) Received: from localhost ([127.0.0.1]:46882 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghClb-0005mn-8V for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:15:27 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33142) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCi0-00038k-OV for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghChz-0001PA-SE for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:44 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37068) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghChz-0001Ox-KE for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:43 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 8E8FB54006A; Wed, 9 Jan 2019 15:11:42 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:42 +0300 Message-ID: <154703590237.13472.3384228842883147216.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 04/21] replay: update docs for record/replay with block devices 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch updates the description of the command lines for using record/replay with attached block devices. Signed-off-by: Pavel Dovgalyuk --- docs/replay.txt | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/docs/replay.txt b/docs/replay.txt index 3497585..2c2c5f6 100644 --- a/docs/replay.txt +++ b/docs/replay.txt @@ -27,7 +27,7 @@ Usage of the record/replay: * First, record the execution with the following command line: qemu-system-i386 \ -icount shift=7,rr=record,rrfile=replay.bin \ - -drive file=disk.qcow2,if=none,id=img-direct \ + -drive file=disk.qcow2,if=none,snapshot,id=img-direct \ -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \ -device ide-hd,drive=img-blkreplay \ -netdev user,id=net1 -device rtl8139,netdev=net1 \ @@ -35,7 +35,7 @@ Usage of the record/replay: * After recording, you can replay it by using another command line: qemu-system-i386 \ -icount shift=7,rr=replay,rrfile=replay.bin \ - -drive file=disk.qcow2,if=none,id=img-direct \ + -drive file=disk.qcow2,if=none,snapshot,id=img-direct \ -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \ -device ide-hd,drive=img-blkreplay \ -netdev user,id=net1 -device rtl8139,netdev=net1 \ @@ -223,7 +223,7 @@ Block devices record/replay module intercepts calls of bdrv coroutine functions at the top of block drivers stack. To record and replay block operations the drive must be configured as following: - -drive file=disk.qcow2,if=none,id=img-direct + -drive file=disk.qcow2,if=none,snapshot,id=img-direct -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay -device ide-hd,drive=img-blkreplay @@ -252,6 +252,12 @@ This snapshot is created at start of recording and restored at start of replaying. It also can be loaded while replaying to roll back the execution. +'snapshot' flag of the disk image must be removed to save the snapshots +in the overlay (or original image) instead of using the temporary overlay. + -drive file=disk.ovl,if=none,id=img-direct + -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay + -device ide-hd,drive=img-blkreplay + Use QEMU monitor to create additional snapshots. 'savevm ' command created the snapshot and 'loadvm ' restores it. To prevent corruption of the original disk image, use overlay files linked to the original images. From patchwork Wed Jan 9 12:11:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022396 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSqp39P4z9sBQ for ; Wed, 9 Jan 2019 23:19:50 +1100 (AEDT) Received: from localhost ([127.0.0.1]:47980 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCpo-0000vb-6P for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:19:48 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33171) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCi6-0003EE-Ly for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:51 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCi5-0001SA-Qz for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:50 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37090) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCi5-0001S0-FL for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:49 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 748E854006A; Wed, 9 Jan 2019 15:11:48 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:48 +0300 Message-ID: <154703590830.13472.16707163731196791753.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 05/21] replay: don't drain/flush bdrv queue while RR is working 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" In record/replay mode bdrv queue is controlled by replay mechanism. It does not allow saving or loading the snapshots when bdrv queue is not empty. Stopping the VM is not blocked by nonempty queue, but flushing the queue is still impossible there, because it may cause deadlocks in replay mode. This patch disables bdrv_drain_all and bdrv_flush_all in record/replay mode. Stopping the machine when the IO requests are not finished is needed for the debugging. E.g., breakpoint may be set at the specified step, and forcing the IO requests to finish may break the determinism of the execution. Signed-off-by: Pavel Dovgalyuk --- block/io.c | 28 ++++++++++++++++++++++++++++ cpus.c | 2 -- 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/block/io.c b/block/io.c index bd9d688..f9a9c5a 100644 --- a/block/io.c +++ b/block/io.c @@ -32,6 +32,7 @@ #include "qemu/cutils.h" #include "qapi/error.h" #include "qemu/error-report.h" +#include "sysemu/replay.h" #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ @@ -538,6 +539,15 @@ void bdrv_drain_all_begin(void) return; } + /* + * bdrv queue is managed by record/replay, + * waiting for finishing the I/O requests may + * be infinite + */ + if (replay_events_enabled()) { + return; + } + /* AIO_WAIT_WHILE() with a NULL context can only be called from the main * loop AioContext, so make sure we're in the main context. */ assert(qemu_get_current_aio_context() == qemu_get_aio_context()); @@ -566,6 +576,15 @@ void bdrv_drain_all_end(void) { BlockDriverState *bs = NULL; + /* + * bdrv queue is managed by record/replay, + * waiting for finishing the I/O requests may + * be endless + */ + if (replay_events_enabled()) { + return; + } + while ((bs = bdrv_next_all_states(bs))) { AioContext *aio_context = bdrv_get_aio_context(bs); @@ -1997,6 +2016,15 @@ int bdrv_flush_all(void) BlockDriverState *bs = NULL; int result = 0; + /* + * bdrv queue is managed by record/replay, + * creating new flush request for stopping + * the VM may break the determinism + */ + if (replay_events_enabled()) { + return result; + } + for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *aio_context = bdrv_get_aio_context(bs); int ret; diff --git a/cpus.c b/cpus.c index b09b702..aa33fb1 100644 --- a/cpus.c +++ b/cpus.c @@ -1078,7 +1078,6 @@ static int do_vm_stop(RunState state, bool send_stop) } bdrv_drain_all(); - replay_disable_events(); ret = bdrv_flush_all(); return ret; @@ -2149,7 +2148,6 @@ int vm_prepare_start(void) /* We are sending this now, but the CPUs will be resumed shortly later */ qapi_event_send_resume(); - replay_enable_events(); cpu_enable_ticks(); runstate_set(RUN_STATE_RUNNING); vm_state_notify(1, RUN_STATE_RUNNING); From patchwork Wed Jan 9 12:11:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022391 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSkp5hVPz9s2P for ; Wed, 9 Jan 2019 23:15:30 +1100 (AEDT) Received: from localhost ([127.0.0.1]:46887 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghClc-0005nJ-NJ for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:15:28 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33224) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiC-0003Iy-5K for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:56 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiB-0001Wj-J9 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:56 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37108) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiB-0001WS-B4 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:11:55 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 5678454006A; Wed, 9 Jan 2019 15:11:54 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:11:54 +0300 Message-ID: <154703591417.13472.6148137548045093688.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 06/21] replay: finish record/replay before closing the disks 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" After recent updates block devices cannot be closed on qemu exit. This happens due to the block request polling when replay is not finished. Therefore now we stop execution recording before closing the block devices. Signed-off-by: Pavel Dovgalyuk --- replay/replay.c | 2 ++ vl.c | 1 + 2 files changed, 3 insertions(+) diff --git a/replay/replay.c b/replay/replay.c index 8b172b2..b75820a 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -385,6 +385,8 @@ void replay_finish(void) g_free(replay_snapshot); replay_snapshot = NULL; + replay_mode = REPLAY_MODE_NONE; + replay_finish_events(); } diff --git a/vl.c b/vl.c index 7de4f55..95fc44a 100644 --- a/vl.c +++ b/vl.c @@ -4678,6 +4678,7 @@ int main(int argc, char **argv, char **envp) /* No more vcpu or device emulation activity beyond this point */ vm_shutdown(); + replay_finish(); job_cancel_sync_all(); bdrv_close_all(); From patchwork Wed Jan 9 12:12:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022394 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSpT6ScHz9sBQ for ; Wed, 9 Jan 2019 23:18:41 +1100 (AEDT) Received: from localhost ([127.0.0.1]:47702 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCoh-00088g-Nd for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:18:39 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33242) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiI-0003M1-3i for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:03 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiH-0001Yt-Cj for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:02 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37128) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiH-0001Yb-4v for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:01 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 2C5C054006A; Wed, 9 Jan 2019 15:12:00 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:00 +0300 Message-ID: <154703592002.13472.15345101256444192021.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 07/21] qcow2: introduce icount field for snapshots 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch introduces the icount field for saving within the snapshot. It is required for navigation between the snapshots in record/replay mode. Signed-off-by: Pavel Dovgalyuk Acked-by: Kevin Wolf --- v2: - documented format changes in docs/interop/qcow2.txt (suggested by Eric Blake) --- block/qcow2-snapshot.c | 7 +++++++ block/qcow2.h | 2 ++ docs/interop/qcow2.txt | 4 ++++ 3 files changed, 13 insertions(+) diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index bb6a5b7..d682946 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -103,6 +103,12 @@ int qcow2_read_snapshots(BlockDriverState *bs) sn->disk_size = bs->total_sectors * BDRV_SECTOR_SIZE; } + if (extra_data_size >= 24) { + sn->icount = be64_to_cpu(extra.icount); + } else { + sn->icount = -1ULL; + } + /* Read snapshot ID */ sn->id_str = g_malloc(id_str_size + 1); ret = bdrv_pread(bs->file, offset, sn->id_str, id_str_size); @@ -209,6 +215,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs) memset(&extra, 0, sizeof(extra)); extra.vm_state_size_large = cpu_to_be64(sn->vm_state_size); extra.disk_size = cpu_to_be64(sn->disk_size); + extra.icount = cpu_to_be64(sn->icount); id_str_size = strlen(sn->id_str); name_size = strlen(sn->name); diff --git a/block/qcow2.h b/block/qcow2.h index a98d245..8554629 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -159,6 +159,7 @@ typedef struct QEMU_PACKED QCowSnapshotHeader { typedef struct QEMU_PACKED QCowSnapshotExtraData { uint64_t vm_state_size_large; uint64_t disk_size; + uint64_t icount; } QCowSnapshotExtraData; @@ -172,6 +173,7 @@ typedef struct QCowSnapshot { uint32_t date_sec; uint32_t date_nsec; uint64_t vm_clock_nsec; + uint64_t icount; } QCowSnapshot; struct Qcow2Cache; diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt index fb5cb47..c1edef7 100644 --- a/docs/interop/qcow2.txt +++ b/docs/interop/qcow2.txt @@ -540,6 +540,10 @@ Snapshot table entry: Byte 48 - 55: Virtual disk size of the snapshot in bytes + Byte 56 - 63: icount value which corresponds to + the record/replay step when the snapshot + was taken + Version 3 images must include extra data at least up to byte 55. From patchwork Wed Jan 9 12:12:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022388 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSgs05Fdz9sLt for ; Wed, 9 Jan 2019 23:12:57 +1100 (AEDT) Received: from localhost ([127.0.0.1]:46198 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCj8-0003TV-PK for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:12:54 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33261) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiO-0003RT-Kd for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiN-0001aU-Ao for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:08 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37152) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiM-0001a5-Tl for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:07 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id EDDCD54006A; Wed, 9 Jan 2019 15:12:05 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:05 +0300 Message-ID: <154703592583.13472.9297189413941172861.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 08/21] migration: introduce icount field for snapshots 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Saving icount as a parameters of the snapshot allows navigation between them in the execution replay scenario. This information can be used for finding a specific snapshot for rewinding the recorded execution to the specific moment of the time. E.g., 'reverse step' action needs to load the nearest snapshot which is prior to the current moment of time . Signed-off-by: Pavel Dovgalyuk --- v2: - made icount in SnapshotInfo optional (suggested by Eric Blake) v7: - added more comments for icount member (suggested by Markus Armbruster) v9: - updated icount comment --- block/qapi.c | 18 ++++++++++++++---- block/qcow2-snapshot.c | 2 ++ blockdev.c | 10 ++++++++++ include/block/snapshot.h | 1 + migration/savevm.c | 5 +++++ qapi/block-core.json | 8 +++++++- qapi/block.json | 3 ++- 7 files changed, 41 insertions(+), 6 deletions(-) diff --git a/block/qapi.c b/block/qapi.c index c66f949..ccf23f3 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -210,6 +210,8 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs, info->date_nsec = sn_tab[i].date_nsec; info->vm_clock_sec = sn_tab[i].vm_clock_nsec / 1000000000; info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000; + info->icount = sn_tab[i].icount; + info->has_icount = sn_tab[i].icount != -1ULL; info_list = g_new0(SnapshotInfoList, 1); info_list->value = info; @@ -663,14 +665,15 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f, QEMUSnapshotInfo *sn) { char buf1[128], date_buf[128], clock_buf[128]; + char icount_buf[128] = {0}; struct tm tm; time_t ti; int64_t secs; if (!sn) { func_fprintf(f, - "%-10s%-20s%7s%20s%15s", - "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); + "%-10s%-18s%7s%20s%13s%11s", + "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK", "ICOUNT"); } else { ti = sn->date_sec; localtime_r(&ti, &tm); @@ -683,13 +686,18 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f, (int)((secs / 60) % 60), (int)(secs % 60), (int)((sn->vm_clock_nsec / 1000000) % 1000)); + if (sn->icount != -1ULL) { + snprintf(icount_buf, sizeof(icount_buf), + "%"PRId64, sn->icount); + } func_fprintf(f, - "%-10s%-20s%7s%20s%15s", + "%-10s%-18s%7s%20s%13s%11s", sn->id_str, sn->name, get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), date_buf, - clock_buf); + clock_buf, + icount_buf); } } @@ -857,6 +865,8 @@ void bdrv_image_info_dump(fprintf_function func_fprintf, void *f, .date_nsec = elem->value->date_nsec, .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL + elem->value->vm_clock_nsec, + .icount = elem->value->has_icount ? + elem->value->icount : -1ULL, }; pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id); diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index d682946..96b57f4 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -379,6 +379,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) sn->date_sec = sn_info->date_sec; sn->date_nsec = sn_info->date_nsec; sn->vm_clock_nsec = sn_info->vm_clock_nsec; + sn->icount = sn_info->icount; /* Allocate the L1 table of the snapshot and copy the current one there. */ l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t)); @@ -698,6 +699,7 @@ int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) sn_info->date_sec = sn->date_sec; sn_info->date_nsec = sn->date_nsec; sn_info->vm_clock_nsec = sn->vm_clock_nsec; + sn_info->icount = sn->icount; } *psn_tab = sn_tab; return s->nb_snapshots; diff --git a/blockdev.c b/blockdev.c index a6f71f9..f6c5f6c 100644 --- a/blockdev.c +++ b/blockdev.c @@ -57,6 +57,7 @@ #include "block/trace.h" #include "sysemu/arch_init.h" #include "sysemu/qtest.h" +#include "sysemu/replay.h" #include "qemu/cutils.h" #include "qemu/help_option.h" #include "qemu/throttle-options.h" @@ -1239,6 +1240,10 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, info->vm_state_size = sn.vm_state_size; info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; + if (sn.icount != -1ULL) { + info->icount = sn.icount; + info->has_icount = true; + } return info; @@ -1447,6 +1452,11 @@ static void internal_snapshot_prepare(BlkActionState *common, sn->date_sec = tv.tv_sec; sn->date_nsec = tv.tv_usec * 1000; sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (replay_mode != REPLAY_MODE_NONE) { + sn->icount = replay_get_current_step(); + } else { + sn->icount = -1ULL; + } ret1 = bdrv_snapshot_create(bs, sn); if (ret1 < 0) { diff --git a/include/block/snapshot.h b/include/block/snapshot.h index f73d109..c9c8975 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -42,6 +42,7 @@ typedef struct QEMUSnapshotInfo { uint32_t date_sec; /* UTC date of the snapshot */ uint32_t date_nsec; uint64_t vm_clock_nsec; /* VM clock relative to boot */ + uint64_t icount; /* record/replay step */ } QEMUSnapshotInfo; int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, diff --git a/migration/savevm.c b/migration/savevm.c index 9e45fb4..a031e5b 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2509,6 +2509,11 @@ int save_snapshot(const char *name, Error **errp) sn->date_sec = tv.tv_sec; sn->date_nsec = tv.tv_usec * 1000; sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (replay_mode != REPLAY_MODE_NONE) { + sn->icount = replay_get_current_step(); + } else { + sn->icount = -1ULL; + } if (name) { ret = bdrv_snapshot_find(bs, old_sn, name); diff --git a/qapi/block-core.json b/qapi/block-core.json index 762000f..a197e5f 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -26,13 +26,19 @@ # # @vm-clock-nsec: fractional part in nano seconds to be used with vm-clock-sec # +# @icount: Current instruction count. Appears when execution record/replay +# is enabled. Used for "time-traveling" to match the moment +# in the recorded execution with the snapshots. This counter may +# be obtained through @query-replay command (since 4.0) +# # Since: 1.3 # ## { 'struct': 'SnapshotInfo', 'data': { 'id': 'str', 'name': 'str', 'vm-state-size': 'int', 'date-sec': 'int', 'date-nsec': 'int', - 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int' } } + 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int', + '*icount': 'int' } } ## # @ImageInfoSpecificQCow2EncryptionBase: diff --git a/qapi/block.json b/qapi/block.json index 11f01f2..a6396a9 100644 --- a/qapi/block.json +++ b/qapi/block.json @@ -176,7 +176,8 @@ # "date-sec": 1000012, # "date-nsec": 10, # "vm-clock-sec": 100, -# "vm-clock-nsec": 20 +# "vm-clock-nsec": 20, +# "icount": 220414 # } # } # From patchwork Wed Jan 9 12:12:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022399 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSvV5rTZz9sBQ for ; Wed, 9 Jan 2019 23:23:02 +1100 (AEDT) Received: from localhost ([127.0.0.1]:48723 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCsu-00038k-FZ for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:23:00 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33297) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiT-0003Vg-LB for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiT-0001ch-0b for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:13 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37180) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiS-0001cZ-PA for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:12 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id BA35F54006A; Wed, 9 Jan 2019 15:12:11 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:11 +0300 Message-ID: <154703593161.13472.3217514062253486720.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 09/21] replay: provide and accessor for rr filename 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds an accessor function for the name of the record/replay log file. Adding an accessor instead of making variable global, prevents accidental modification of this variable by other modules. Signed-off-by: Pavel Dovgalyuk --- include/sysemu/replay.h | 2 ++ replay/replay.c | 5 +++++ 2 files changed, 7 insertions(+) diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 3a7c58e..b3f593f 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -71,6 +71,8 @@ void replay_start(void); void replay_finish(void); /*! Adds replay blocker with the specified error description */ void replay_add_blocker(Error *reason); +/* Returns name of the replay log file */ +const char *replay_get_filename(void); /* Processing the instructions */ diff --git a/replay/replay.c b/replay/replay.c index b75820a..aa53411 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -394,3 +394,8 @@ void replay_add_blocker(Error *reason) { replay_blockers = g_slist_prepend(replay_blockers, reason); } + +const char *replay_get_filename(void) +{ + return replay_filename; +} From patchwork Wed Jan 9 12:12:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022395 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSpY0kmVz9sBQ for ; Wed, 9 Jan 2019 23:18:45 +1100 (AEDT) Received: from localhost ([127.0.0.1]:47721 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCol-0008Bm-2i for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:18:43 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33319) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCia-0003bV-CE for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiZ-0001ep-BS for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:20 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37210) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiY-0001eQ-QY for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:19 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 9EA1F54006A; Wed, 9 Jan 2019 15:12:17 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:17 +0300 Message-ID: <154703593746.13472.3886549854409661470.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 10/21] qapi: introduce replay.json for record/replay-related stuff 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds replay.json file. It will be used for adding record/replay-related data structures and commands. Signed-off-by: Pavel Dovgalyuk --- MAINTAINERS | 1 + Makefile.objs | 4 ++-- include/sysemu/replay.h | 1 + qapi/misc.json | 18 ------------------ qapi/qapi-schema.json | 1 + qapi/replay.json | 26 ++++++++++++++++++++++++++ 6 files changed, 31 insertions(+), 20 deletions(-) create mode 100644 qapi/replay.json diff --git a/MAINTAINERS b/MAINTAINERS index 0bfd95a..7b0a1bc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2122,6 +2122,7 @@ F: net/filter-replay.c F: include/sysemu/replay.h F: docs/replay.txt F: stubs/replay.c +F: qapi/replay.json IOVA Tree M: Peter Xu diff --git a/Makefile.objs b/Makefile.objs index 4561159..8164b22 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -1,6 +1,6 @@ QAPI_MODULES = block-core block char common crypto introspect job migration -QAPI_MODULES += misc net rdma rocker run-state sockets tpm trace transaction -QAPI_MODULES += ui +QAPI_MODULES += misc net rdma replay rocker run-state sockets tpm trace +QAPI_MODULES += transaction ui ####################################################################### # Common libraries for tools and emulators diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index b3f593f..2054296 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -13,6 +13,7 @@ */ #include "sysemu.h" +#include "qapi/qapi-types-replay.h" #include "qapi/qapi-types-misc.h" #include "qapi/qapi-types-ui.h" diff --git a/qapi/misc.json b/qapi/misc.json index 24d20a8..e5e0bea 100644 --- a/qapi/misc.json +++ b/qapi/misc.json @@ -3125,24 +3125,6 @@ 'data': { 'offset': 'int' } } ## -# @ReplayMode: -# -# Mode of the replay subsystem. -# -# @none: normal execution mode. Replay or record are not enabled. -# -# @record: record mode. All non-deterministic data is written into the -# replay log. -# -# @play: replay mode. Non-deterministic data required for system execution -# is read from the log. -# -# Since: 2.5 -## -{ 'enum': 'ReplayMode', - 'data': [ 'none', 'record', 'play' ] } - -## # @xen-load-devices-state: # # Load the state of all devices from file. The RAM and the block devices diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json index 3bbdfce..b85fd04 100644 --- a/qapi/qapi-schema.json +++ b/qapi/qapi-schema.json @@ -95,3 +95,4 @@ { 'include': 'trace.json' } { 'include': 'introspect.json' } { 'include': 'misc.json' } +{ 'include': 'replay.json' } diff --git a/qapi/replay.json b/qapi/replay.json new file mode 100644 index 0000000..9e13551 --- /dev/null +++ b/qapi/replay.json @@ -0,0 +1,26 @@ +# -*- Mode: Python -*- +# + +## +# = Record/replay +## + +{ 'include': 'common.json' } + +## +# @ReplayMode: +# +# Mode of the replay subsystem. +# +# @none: normal execution mode. Replay or record are not enabled. +# +# @record: record mode. All non-deterministic data is written into the +# replay log. +# +# @play: replay mode. Non-deterministic data required for system execution +# is read from the log. +# +# Since: 2.5 +## +{ 'enum': 'ReplayMode', + 'data': [ 'none', 'record', 'play' ] } From patchwork Wed Jan 9 12:12:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022398 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZStH3x2xz9sBQ for ; Wed, 9 Jan 2019 23:21:59 +1100 (AEDT) Received: from localhost ([127.0.0.1]:48458 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCrt-0002OI-DK for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:21:57 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33336) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCii-0003ik-Eo for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCig-0001hf-Jl for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:28 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37236) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCie-0001gj-MF for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:26 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 94DBA54006A; Wed, 9 Jan 2019 15:12:23 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:23 +0300 Message-ID: <154703594341.13472.10192138424843641646.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 11/21] replay: introduce info hmp/qmp command 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch introduces 'info replay' monitor command and corresponding qmp request. These commands request the current record/replay mode, replay log file name, and the execution step (number or recorded/replayed instructions). User may use step number for replay_seek/replay_break commands and for controlling the execution of replay. Signed-off-by: Pavel Dovgalyuk Acked-by: Dr. David Alan Gilbert --- v2: - renamed info_replay qmp into query-replay (suggested by Eric Blake) v7: - added empty line (suggested by Markus Armbruster) v9: - changed 'step' parameter name to 'icount' - moved json stuff to replay.json and updated the descriptions (suggested by Markus Armbruster) --- hmp-commands-info.hx | 14 ++++++++++++++ hmp.h | 1 + qapi/replay.json | 39 +++++++++++++++++++++++++++++++++++++++ replay/Makefile.objs | 3 ++- replay/replay-debugging.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 98 insertions(+), 1 deletion(-) create mode 100644 replay/replay-debugging.c diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx index cbee8b9..866bc0f 100644 --- a/hmp-commands-info.hx +++ b/hmp-commands-info.hx @@ -918,6 +918,20 @@ STEXI Show SEV information. ETEXI + { + .name = "replay", + .args_type = "", + .params = "", + .help = "show parameters of the record/replay", + .cmd = hmp_info_replay, + }, + +STEXI +@item info replay +@findex info replay +Display the record/replay information: mode and the current icount. +ETEXI + STEXI @end table ETEXI diff --git a/hmp.h b/hmp.h index 5f1addc..d792149 100644 --- a/hmp.h +++ b/hmp.h @@ -148,5 +148,6 @@ void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict); void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict); 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); #endif diff --git a/qapi/replay.json b/qapi/replay.json index 9e13551..d7e76cf 100644 --- a/qapi/replay.json +++ b/qapi/replay.json @@ -24,3 +24,42 @@ ## { 'enum': 'ReplayMode', 'data': [ 'none', 'record', 'play' ] } + +## +# @ReplayInfo: +# +# Record/replay information. +# +# @mode: current mode. +# +# @filename: name of the record/replay log file. +# It is present only in record or replay modes, when the log +# is recorded or replayed. +# +# @icount: current number of executed instructions. +# +# Since: 4.0 +# +## +{ 'struct': 'ReplayInfo', + 'data': { 'mode': 'ReplayMode', '*filename': 'str', 'icount': 'int' } } + +## +# @query-replay: +# +# Retrieves the record/replay information. +# It includes current icount which may be used for replay-break and +# replay-seek commands. +# +# Returns: structure with the properties of the record/replay. +# +# Since: 4.0 +# +# Example: +# +# -> { "execute": "query-replay" } +# <- { "return": { "mode": "play", "filename": "log.rr", "icount": 220414 } } +# +## +{ 'command': 'query-replay', + 'returns': 'ReplayInfo' } diff --git a/replay/Makefile.objs b/replay/Makefile.objs index cee6539..6694e3e 100644 --- a/replay/Makefile.objs +++ b/replay/Makefile.objs @@ -6,4 +6,5 @@ common-obj-y += replay-input.o common-obj-y += replay-char.o common-obj-y += replay-snapshot.o common-obj-y += replay-net.o -common-obj-y += replay-audio.o \ No newline at end of file +common-obj-y += replay-audio.o +common-obj-y += replay-debugging.o diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c new file mode 100644 index 0000000..9956405 --- /dev/null +++ b/replay/replay-debugging.c @@ -0,0 +1,42 @@ +/* + * replay-debugging.c + * + * Copyright (c) 2010-2018 Institute for System Programming + * of the Russian Academy of Sciences. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "sysemu/replay.h" +#include "replay-internal.h" +#include "hmp.h" +#include "monitor/monitor.h" +#include "qapi/qapi-commands-replay.h" + +void hmp_info_replay(Monitor *mon, const QDict *qdict) +{ + if (replay_mode == REPLAY_MODE_NONE) { + monitor_printf(mon, "No record/replay\n"); + } else { + monitor_printf(mon, "%s execution '%s': current step = %"PRId64"\n", + replay_mode == REPLAY_MODE_RECORD ? "Recording" : "Replaying", + replay_get_filename(), replay_get_current_step()); + } +} + +ReplayInfo *qmp_query_replay(Error **errp) +{ + ReplayInfo *retval = g_new0(ReplayInfo, 1); + + retval->mode = replay_mode; + if (replay_get_filename()) { + retval->filename = g_strdup(replay_get_filename()); + retval->has_filename = true; + } + retval->icount = replay_get_current_step(); + return retval; +} From patchwork Wed Jan 9 12:12:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022397 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSt85BJzz9sBQ for ; Wed, 9 Jan 2019 23:21:52 +1100 (AEDT) Received: from localhost ([127.0.0.1]:48436 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCrm-0002Kh-8q for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:21:50 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33366) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiq-0003rG-CI for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCio-0001lh-Vr for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:36 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37258) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCik-0001jo-LX for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:32 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 6DCB454006A; Wed, 9 Jan 2019 15:12:29 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:29 +0300 Message-ID: <154703594930.13472.14801510978993753998.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 12/21] replay: introduce breakpoint at the specified 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch introduces replay_break, replay_delete_break qmp and hmp commands. These commands allow stopping at the specified instruction. It may be useful for debugging when there are some known events that should be investigated. replay_break command has one argument - number of instructions executed since the start of the replay. replay_delete_break removes previously set breakpoint. Signed-off-by: Pavel Dovgalyuk --- v2: - renamed replay_break qmp command into replay-break (suggested by Eric Blake) v7: - introduces replay_delete_break command v9: - changed 'step' parameter name to 'icount' - moved json stuff to replay.json and updated the description (suggested by Markus Armbruster) --- hmp-commands.hx | 34 ++++++++++++++++++ hmp.h | 2 + qapi/replay.json | 36 +++++++++++++++++++ replay/replay-debugging.c | 85 +++++++++++++++++++++++++++++++++++++++++++++ replay/replay-internal.h | 4 ++ replay/replay.c | 17 +++++++++ 6 files changed, 178 insertions(+) diff --git a/hmp-commands.hx b/hmp-commands.hx index ba71558..6d04c02 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1890,6 +1890,40 @@ Set QOM property @var{property} of object at location @var{path} to value @var{v ETEXI { + .name = "replay_break", + .args_type = "icount:i", + .params = "icount", + .help = "sets breakpoint on the step specified by the icount of the replay", + .cmd = hmp_replay_break, + }, + +STEXI +@item replay_break @var{icount} +@findex replay_break +Set breakpoint on the step of the replay specified by @var{icount}. +Execution stops when the specified @var{icount} is reached. +icount for the reference may be observed with 'info replay' command. +There could be at most one breakpoint. When breakpoint is set, the prior +one is removed. The breakpoints may be set only in replay mode and only +at the step in the future. +ETEXI + + { + .name = "replay_delete_break", + .args_type = "", + .params = "", + .help = "removes replay breakpoint", + .cmd = hmp_replay_delete_break, + }, + +STEXI +@item replay_delete_break +@findex replay_delete_break +Removes replay breakpoint which was previously set with replay_break. +The command is ignored when there are no replay breakpoints. +ETEXI + + { .name = "info", .args_type = "item:s?", .params = "[subcommand]", diff --git a/hmp.h b/hmp.h index d792149..c9b9b4f 100644 --- a/hmp.h +++ b/hmp.h @@ -149,5 +149,7 @@ void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict); 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_delete_break(Monitor *mon, const QDict *qdict); #endif diff --git a/qapi/replay.json b/qapi/replay.json index d7e76cf..a63219c 100644 --- a/qapi/replay.json +++ b/qapi/replay.json @@ -63,3 +63,39 @@ ## { 'command': 'query-replay', 'returns': 'ReplayInfo' } + +## +# @replay-break: +# +# Set breakpoint on the step of the replay specified by @icount. +# Execution stops when the specified @icount is reached. +# icount for the reference may be obtained with @query-replay command. +# There could be at most one breakpoint. When breakpoint is set, the prior +# one is removed. The breakpoints may be set only in replay mode and only +# at the step in the future. +# +# @icount: execution step to stop at +# +# Since: 4.0 +# +# Example: +# +# -> { "execute": "replay-break", "data": { "icount": 220414 } } +# +## +{ 'command': 'replay-break', 'data': { 'icount': 'int' } } + +## +# @replay-delete-break: +# +# Removes replay breakpoint which was set with @replay-break. +# The command is ignored when there are no replay breakpoints. +# +# Since: 4.0 +# +# Example: +# +# -> { "execute": "replay-delete-break" } +# +## +{ 'command': 'replay-delete-break' } diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 9956405..8ee64b2 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -16,6 +16,8 @@ #include "hmp.h" #include "monitor/monitor.h" #include "qapi/qapi-commands-replay.h" +#include "qapi/qmp/qdict.h" +#include "qemu/timer.h" void hmp_info_replay(Monitor *mon, const QDict *qdict) { @@ -40,3 +42,86 @@ ReplayInfo *qmp_query_replay(Error **errp) retval->icount = replay_get_current_step(); return retval; } + +static void replay_break(uint64_t step, QEMUTimerCB callback, void *opaque) +{ + assert(replay_mode == REPLAY_MODE_PLAY); + assert(replay_mutex_locked()); + assert(replay_break_step >= replay_get_current_step()); + assert(callback); + + replay_break_step = step; + + if (replay_break_timer) { + timer_del(replay_break_timer); + } else { + replay_break_timer = timer_new_ns(QEMU_CLOCK_REALTIME, + callback, opaque); + } +} + +static void replay_delete_break(void) +{ + assert(replay_mode == REPLAY_MODE_PLAY); + assert(replay_mutex_locked()); + + if (replay_break_timer) { + timer_del(replay_break_timer); + timer_free(replay_break_timer); + replay_break_timer = NULL; + } + replay_break_step = -1ULL; +} + +static void replay_stop_vm(void *opaque) +{ + vm_stop(RUN_STATE_PAUSED); + replay_delete_break(); +} + +void qmp_replay_break(int64_t icount, Error **errp) +{ + if (replay_mode == REPLAY_MODE_PLAY) { + if (icount >= replay_get_current_step()) { + replay_break(icount, replay_stop_vm, NULL); + } else { + error_setg(errp, "cannot set breakpoint at the step in the past"); + } + } else { + error_setg(errp, "setting the breakpoint is allowed only in play mode"); + } +} + +void hmp_replay_break(Monitor *mon, const QDict *qdict) +{ + int64_t step = qdict_get_try_int(qdict, "icount", -1LL); + Error *err = NULL; + + qmp_replay_break(step, &err); + if (err) { + error_report_err(err); + error_free(err); + return; + } +} + +void qmp_replay_delete_break(Error **errp) +{ + if (replay_mode == REPLAY_MODE_PLAY) { + replay_delete_break(); + } else { + error_setg(errp, "replay breakpoints are allowed only in play mode"); + } +} + +void hmp_replay_delete_break(Monitor *mon, const QDict *qdict) +{ + Error *err = NULL; + + qmp_replay_delete_break(&err); + if (err) { + error_report_err(err); + error_free(err); + return; + } +} diff --git a/replay/replay-internal.h b/replay/replay-internal.h index af6f4d5..94b7e9b 100644 --- a/replay/replay-internal.h +++ b/replay/replay-internal.h @@ -91,6 +91,10 @@ extern ReplayState replay_state; /* File for replay writing */ extern FILE *replay_file; +/* Step of the replay breakpoint */ +extern uint64_t replay_break_step; +/* Timer for the replay breakpoint callback */ +extern QEMUTimer *replay_break_timer; void replay_put_byte(uint8_t byte); void replay_put_event(uint8_t event); diff --git a/replay/replay.c b/replay/replay.c index aa53411..3996499 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -34,6 +34,10 @@ static char *replay_filename; ReplayState replay_state; static GSList *replay_blockers; +/* Replay breakpoints */ +uint64_t replay_break_step = -1ULL; +QEMUTimer *replay_break_timer; + bool replay_next_event_is(int event) { bool res = false; @@ -73,6 +77,13 @@ int replay_get_instructions(void) replay_mutex_lock(); if (replay_next_event_is(EVENT_INSTRUCTION)) { res = replay_state.instructions_count; + if (replay_break_step != -1LL) { + uint64_t current = replay_get_current_step(); + assert(replay_break_step >= current); + if (current + res > replay_break_step) { + res = replay_break_step - current; + } + } } replay_mutex_unlock(); return res; @@ -99,6 +110,12 @@ void replay_account_executed_instructions(void) will be read from the log. */ qemu_notify_event(); } + /* Execution reached the break step */ + if (replay_break_step == replay_state.current_step) { + /* Cannot make callback directly from the vCPU thread */ + timer_mod_ns(replay_break_timer, + qemu_clock_get_ns(QEMU_CLOCK_REALTIME)); + } } } } From patchwork Wed Jan 9 12:12:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022400 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSxF4Vr7z9sBQ for ; Wed, 9 Jan 2019 23:24:33 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49080 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCuN-0004ED-HJ for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:24:31 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33378) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCit-0003tG-Mu for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCis-0001nc-1v for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:39 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37288) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiq-0001m3-DM for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:37 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 4314E54006A; Wed, 9 Jan 2019 15:12:35 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:35 +0300 Message-ID: <154703595509.13472.7357387659078524086.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 13/21] 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, 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 command 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) v7: - small fixes related to Markus Armbruster's review v9: - changed 'step' parameter name to 'icount' - moved json stuff to replay.json and updated the description (suggested by Markus Armbruster) --- hmp-commands.hx | 19 +++++++++ hmp.h | 1 qapi/replay.json | 20 ++++++++++ replay/replay-debugging.c | 91 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 131 insertions(+) diff --git a/hmp-commands.hx b/hmp-commands.hx index 6d04c02..2839acc 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1924,6 +1924,25 @@ The command is ignored when there are no replay breakpoints. ETEXI { + .name = "replay_seek", + .args_type = "icount:i", + .params = "icount", + .help = "rewinds replay to the step specified by icount", + .cmd = hmp_replay_seek, + }, + +STEXI +@item replay_seek @var{icount} +@findex replay_seek +Automatically proceeds to the step specified by @var{icount}, when +replaying the execution. The command automatically loads nearest +snapshot and replay the execution to find the desired step. +When there is no preceding snapshot or the execution is not replayed, +then the command is ignored. +icount for the reference may be observed with 'info replay' command. +ETEXI + + { .name = "info", .args_type = "item:s?", .params = "[subcommand]", diff --git a/hmp.h b/hmp.h index c9b9b4f..d6e1d7e 100644 --- a/hmp.h +++ b/hmp.h @@ -151,5 +151,6 @@ 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 a63219c..7390f88 100644 --- a/qapi/replay.json +++ b/qapi/replay.json @@ -99,3 +99,23 @@ # ## { 'command': 'replay-delete-break' } + +## +# @replay-seek: +# +# Automatically proceeds to the step specified by @icount when replaying +# the execution. The command automatically loads nearest +# snapshot and replay the execution to find the desired step. +# When there is no preceding snapshot or the execution is not replayed, +# then the command is ignored. +# icount for the reference may be obtained with @query-replay command. +# +# @icount: destination execution step +# +# Since: 4.0 +# +# 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 8ee64b2..39848dc 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -18,6 +18,8 @@ #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) { @@ -125,3 +127,92 @@ void hmp_replay_delete_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, QEMUTimerCB callback, Error **errp) +{ + char *snapshot = NULL; + int64_t snapshot_step; + + 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(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 icount, Error **errp) +{ + replay_seek(icount, replay_stop_vm, errp); +} + +void hmp_replay_seek(Monitor *mon, const QDict *qdict) +{ + int64_t step = qdict_get_try_int(qdict, "icount", -1LL); + Error *err = NULL; + + qmp_replay_seek(step, &err); + if (err) { + error_report_err(err); + error_free(err); + return; + } +} From patchwork Wed Jan 9 12:12:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022401 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSxP1Yqdz9sDL for ; Wed, 9 Jan 2019 23:24:41 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49102 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCuV-0004JH-6H for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:24:39 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33417) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCix-0003uu-Ki for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCiw-0001tH-GD for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:43 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37312) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCiw-0001so-4g for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:42 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 26AB354006A; Wed, 9 Jan 2019 15:12:41 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:41 +0300 Message-ID: <154703596094.13472.5034708326884072454.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 14/21] replay: refine replay-time module 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch removes refactoring artifacts from the replay/replay-time.c Signed-off-by: Pavel Dovgalyuk --- replay/replay-time.c | 36 ++++++++++++++++-------------------- 1 file changed, 16 insertions(+), 20 deletions(-) diff --git a/replay/replay-time.c b/replay/replay-time.c index 0df1693..60f47b7 100644 --- a/replay/replay-time.c +++ b/replay/replay-time.c @@ -15,18 +15,19 @@ #include "replay-internal.h" #include "qemu/error-report.h" -int64_t replay_save_clock(ReplayClockKind kind, int64_t clock, int64_t raw_icount) +int64_t replay_save_clock(ReplayClockKind kind, int64_t clock, + int64_t raw_icount) { - if (replay_file) { - g_assert(replay_mutex_locked()); + g_assert(replay_file); + g_assert(replay_mutex_locked()); - /* Due to the caller's locking requirements we get the icount from it - * instead of using replay_save_instructions(). - */ - replay_advance_current_step(raw_icount); - replay_put_event(EVENT_CLOCK + kind); - replay_put_qword(clock); - } + /* + * Due to the caller's locking requirements we get the icount from it + * instead of using replay_save_instructions(). + */ + replay_advance_current_step(raw_icount); + replay_put_event(EVENT_CLOCK + kind); + replay_put_qword(clock); return clock; } @@ -48,20 +49,15 @@ void replay_read_next_clock(ReplayClockKind kind) /*! Reads next clock event from the input. */ int64_t replay_read_clock(ReplayClockKind kind) { + int64_t ret; g_assert(replay_file && replay_mutex_locked()); replay_account_executed_instructions(); - if (replay_file) { - int64_t ret; - if (replay_next_event_is(EVENT_CLOCK + kind)) { - replay_read_next_clock(kind); - } - ret = replay_state.cached_clock[kind]; - - return ret; + if (replay_next_event_is(EVENT_CLOCK + kind)) { + replay_read_next_clock(kind); } + ret = replay_state.cached_clock[kind]; - error_report("REPLAY INTERNAL ERROR %d", __LINE__); - exit(1); + return ret; } From patchwork Wed Jan 9 12:12:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022403 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZT0J5Fqrz9sDL for ; Wed, 9 Jan 2019 23:27:12 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49764 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCww-0006Mk-Fk for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:27:10 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33464) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCj3-000408-1h for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:49 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCj2-0001ww-9e for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:49 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37334) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCj2-0001wi-1i for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:48 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 02D6A54006A; Wed, 9 Jan 2019 15:12:46 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:46 +0300 Message-ID: <154703596683.13472.4202105289921311854.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 15/21] replay: flush rr queue before loading the vmstate 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Non-empty record/replay queue prevents saving and loading the VM state, because it includes pending bottom halves and block coroutines. But when the new VM state is loaded, we don't have to preserve the consistency of the current state anymore. Therefore this patch just flushes the queue allowing the coroutines to finish. Signed-off-by: Pavel Dovgalyuk --- include/sysemu/replay.h | 2 ++ migration/savevm.c | 6 ++++++ replay/replay-internal.h | 2 -- 3 files changed, 8 insertions(+), 2 deletions(-) diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 2054296..1b758ec 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -141,6 +141,8 @@ void replay_disable_events(void); void replay_enable_events(void); /*! Returns true when saving events is enabled */ bool replay_events_enabled(void); +/* Flushes events queue */ +void replay_flush_events(void); /*! Adds bottom half event to the queue */ void replay_bh_schedule_event(QEMUBH *bh); /*! Adds input event to the queue */ diff --git a/migration/savevm.c b/migration/savevm.c index a031e5b..5a9902d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2701,6 +2701,12 @@ int load_snapshot(const char *name, Error **errp) return -EINVAL; } + /* + * Flush the record/replay queue. Now the VM state is going + * to change. Therefore we don't need to preserve its consistency + */ + replay_flush_events(); + /* Flush all IO requests so they don't interfere with the new state. */ bdrv_drain_all_begin(); diff --git a/replay/replay-internal.h b/replay/replay-internal.h index 94b7e9b..e37b201 100644 --- a/replay/replay-internal.h +++ b/replay/replay-internal.h @@ -146,8 +146,6 @@ void replay_read_next_clock(unsigned int kind); void replay_init_events(void); /*! Clears internal data structures for events handling */ void replay_finish_events(void); -/*! Flushes events queue */ -void replay_flush_events(void); /*! Returns true if there are any unsaved events in the queue */ bool replay_has_events(void); /*! Saves events from queue into the file */ From patchwork Wed Jan 9 12:12:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022392 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSlQ3Tv0z9s2P for ; Wed, 9 Jan 2019 23:16:01 +1100 (AEDT) Received: from localhost ([127.0.0.1]:47053 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCm6-0006FU-4W for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:15:58 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33537) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjA-00046V-By for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCj8-00020C-70 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:55 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37354) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCj7-0001zk-R8 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:12:54 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id D708E54006A; Wed, 9 Jan 2019 15:12:52 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:52 +0300 Message-ID: <154703597273.13472.1657881488884600872.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 16/21] gdbstub: add reverse step support in replay mode 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" GDB remote protocol supports two reverse debugging commands: reverse step and reverse continue. This patch adds support of the first one to the gdbstub. Reverse step is intended to step one instruction in the backwards direction. This is not possible in regular execution. But replayed execution is deterministic, therefore we can load one of the prior snapshots and proceed to the desired step. It is equivalent to stepping one instruction back. There should be at least one snapshot preceding the debugged part of the replay log. Signed-off-by: Pavel Dovgalyuk --- accel/tcg/translator.c | 1 + cpus.c | 14 +++++++++++--- exec.c | 7 +++++++ gdbstub.c | 44 +++++++++++++++++++++++++++++++++++++++++--- include/sysemu/replay.h | 11 +++++++++++ replay/replay-debugging.c | 33 +++++++++++++++++++++++++++++++++ stubs/replay.c | 5 +++++ 7 files changed, 109 insertions(+), 6 deletions(-) diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c index afd0a49..33a543e 100644 --- a/accel/tcg/translator.c +++ b/accel/tcg/translator.c @@ -17,6 +17,7 @@ #include "exec/gen-icount.h" #include "exec/log.h" #include "exec/translator.h" +#include "sysemu/replay.h" /* Pairs with tcg_clear_temp_count. To be called by #TranslatorOps.{translate_insn,tb_stop} if diff --git a/cpus.c b/cpus.c index aa33fb1..013341c 100644 --- a/cpus.c +++ b/cpus.c @@ -1104,9 +1104,17 @@ static bool cpu_can_run(CPUState *cpu) static void cpu_handle_guest_debug(CPUState *cpu) { - gdb_set_stop_cpu(cpu); - qemu_system_debug_request(); - cpu->stopped = true; + if (!replay_running_debug()) { + gdb_set_stop_cpu(cpu); + qemu_system_debug_request(); + cpu->stopped = true; + } else { + if (!cpu->singlestep_enabled) { + cpu_single_step(cpu, SSTEP_ENABLE); + } else { + cpu_single_step(cpu, 0); + } + } } #ifdef CONFIG_LINUX diff --git a/exec.c b/exec.c index 6e875f0..10f2927 100644 --- a/exec.c +++ b/exec.c @@ -2739,6 +2739,13 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { if (cpu_watchpoint_address_matches(wp, vaddr, len) && (wp->flags & flags)) { + if (replay_running_debug()) { + /* + * Don't process the watchpoints when we are + * in a reverse debugging operation. + */ + return; + } if (flags == BP_MEM_READ) { wp->flags |= BP_WATCHPOINT_HIT_READ; } else { diff --git a/gdbstub.c b/gdbstub.c index bfc7afb..442187d 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -39,6 +39,7 @@ #include "sysemu/kvm.h" #include "exec/semihost.h" #include "exec/exec-all.h" +#include "sysemu/replay.h" #ifdef CONFIG_USER_ONLY #define GDB_ATTACHED "0" @@ -344,6 +345,20 @@ typedef struct GDBState { */ static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER; +/* Retrieves flags for single step mode. */ +static int get_sstep_flags(void) +{ + /* + * In replay mode all events written into the log should be replayed. + * That is why NOIRQ flag is removed in this mode. + */ + if (replay_mode != REPLAY_MODE_NONE) { + return SSTEP_ENABLE; + } else { + return sstep_flags; + } +} + static GDBState *gdbserver_state; bool gdb_has_xml; @@ -434,7 +449,7 @@ static int gdb_continue_partial(GDBState *s, char *newstates) CPU_FOREACH(cpu) { if (newstates[cpu->cpu_index] == 's') { trace_gdbstub_op_stepping(cpu->cpu_index); - cpu_single_step(cpu, sstep_flags); + cpu_single_step(cpu, get_sstep_flags()); } } s->running_state = 1; @@ -453,7 +468,7 @@ static int gdb_continue_partial(GDBState *s, char *newstates) break; /* nothing to do here */ case 's': trace_gdbstub_op_stepping(cpu->cpu_index); - cpu_single_step(cpu, sstep_flags); + cpu_single_step(cpu, get_sstep_flags()); cpu_resume(cpu); flag = 1; break; @@ -1433,9 +1448,28 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) addr = strtoull(p, (char **)&p, 16); gdb_set_cpu_pc(s, addr); } - cpu_single_step(s->c_cpu, sstep_flags); + cpu_single_step(s->c_cpu, get_sstep_flags()); gdb_continue(s); return RS_IDLE; + case 'b': + /* Backward debugging commands */ + if (replay_mode == REPLAY_MODE_PLAY) { + switch (*p) { + case 's': + if (replay_reverse_step()) { + gdb_continue(s); + return RS_IDLE; + } else { + put_packet(s, "E14"); + break; + } + default: + goto unknown_command; + } + } else { + put_packet(s, "E22"); + } + goto unknown_command; case 'F': { target_ulong ret; @@ -1738,6 +1772,10 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) } pstrcat(buf, sizeof(buf), ";multiprocess+"); + if (replay_mode == REPLAY_MODE_PLAY) { + pstrcat(buf, sizeof(buf), ";ReverseStep+"); + } + put_packet(s, buf); break; } diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 1b758ec..b0e2309 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -74,6 +74,17 @@ void replay_finish(void); void replay_add_blocker(Error *reason); /* Returns name of the replay log file */ const char *replay_get_filename(void); +/* + * Start making one step in backward direction. + * Used by gdbstub for backwards debugging. + * Returns true on success. + */ +bool replay_reverse_step(void); +/* + * Returns true if replay module is processing + * reverse_continue or reverse_step request + */ +bool replay_running_debug(void); /* Processing the instructions */ diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 39848dc..dfade54 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -21,6 +21,13 @@ #include "block/snapshot.h" #include "migration/snapshot.h" +static bool replay_is_debugging; + +bool replay_running_debug(void) +{ + return replay_is_debugging; +} + void hmp_info_replay(Monitor *mon, const QDict *qdict) { if (replay_mode == REPLAY_MODE_NONE) { @@ -216,3 +223,29 @@ void hmp_replay_seek(Monitor *mon, const QDict *qdict) return; } } + +static void replay_stop_vm_debug(void *opaque) +{ + replay_is_debugging = false; + vm_stop(RUN_STATE_DEBUG); + replay_break(-1LL, NULL, NULL); +} + +bool replay_reverse_step(void) +{ + Error *err = NULL; + + assert(replay_mode == REPLAY_MODE_PLAY); + + if (replay_get_current_step() != 0) { + replay_seek(replay_get_current_step() - 1, replay_stop_vm_debug, &err); + if (err) { + error_free(err); + return false; + } + replay_is_debugging = true; + return true; + } + + return false; +} diff --git a/stubs/replay.c b/stubs/replay.c index 4ac6078..521552f 100644 --- a/stubs/replay.c +++ b/stubs/replay.c @@ -80,3 +80,8 @@ void replay_mutex_lock(void) void replay_mutex_unlock(void) { } + +bool replay_reverse_step(void) +{ + return false; +} From patchwork Wed Jan 9 12:12:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022406 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZT3Q3sRPz9sDL for ; Wed, 9 Jan 2019 23:29:54 +1100 (AEDT) Received: from localhost ([127.0.0.1]:50455 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCzY-0000Dp-Dr for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:29:52 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33570) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjG-0004BP-1W for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:03 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCjE-00023A-LE for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:02 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37376) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjE-00022V-5L for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:00 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id A095954006A; Wed, 9 Jan 2019 15:12:58 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:12:58 +0300 Message-ID: <154703597852.13472.17361215039546459735.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 17/21] gdbstub: add reverse continue support in replay mode 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds support of the reverse continue operation for gdbstub. Reverse continue finds the last breakpoint that would happen in normal execution from the beginning to the current moment. Implementation of the reverse continue replays the execution twice: to find the breakpoints that were hit and to seek to the last breakpoint. Reverse continue loads the previous snapshot and tries to find the breakpoint since that moment. If there are no such breakpoints, it proceeds to the earlier snapshot, and so on. When no breakpoints or watchpoints were hit at all, execution stops at the beginning of the replay log. Signed-off-by: Pavel Dovgalyuk --- cpus.c | 5 +++ exec.c | 1 + gdbstub.c | 10 ++++++ include/sysemu/replay.h | 8 +++++ replay/replay-debugging.c | 71 +++++++++++++++++++++++++++++++++++++++++++++ stubs/replay.c | 5 +++ 6 files changed, 99 insertions(+), 1 deletion(-) diff --git a/cpus.c b/cpus.c index 013341c..6ef0992 100644 --- a/cpus.c +++ b/cpus.c @@ -1110,6 +1110,11 @@ static void cpu_handle_guest_debug(CPUState *cpu) cpu->stopped = true; } else { if (!cpu->singlestep_enabled) { + /* + * Report about the breakpoint and + * make a single step to skip it + */ + replay_breakpoint(); cpu_single_step(cpu, SSTEP_ENABLE); } else { cpu_single_step(cpu, 0); diff --git a/exec.c b/exec.c index 10f2927..4278fcb 100644 --- a/exec.c +++ b/exec.c @@ -2744,6 +2744,7 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) * Don't process the watchpoints when we are * in a reverse debugging operation. */ + replay_breakpoint(); return; } if (flags == BP_MEM_READ) { diff --git a/gdbstub.c b/gdbstub.c index 442187d..60176d5 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -1463,6 +1463,14 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) put_packet(s, "E14"); break; } + case 'c': + if (replay_reverse_continue()) { + gdb_continue(s); + return RS_IDLE; + } else { + put_packet(s, "E14"); + break; + } default: goto unknown_command; } @@ -1773,7 +1781,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) pstrcat(buf, sizeof(buf), ";multiprocess+"); if (replay_mode == REPLAY_MODE_PLAY) { - pstrcat(buf, sizeof(buf), ";ReverseStep+"); + pstrcat(buf, sizeof(buf), ";ReverseStep+;ReverseContinue+"); } put_packet(s, buf); diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index b0e2309..5baf10a 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -81,10 +81,18 @@ const char *replay_get_filename(void); */ bool replay_reverse_step(void); /* + * Start searching the last breakpoint/watchpoint. + * Used by gdbstub for backwards debugging. + * Returns true if the process successfully started. + */ +bool replay_reverse_continue(void); +/* * Returns true if replay module is processing * reverse_continue or reverse_step request */ bool replay_running_debug(void); +/* Called in reverse debugging mode to collect breakpoint information */ +void replay_breakpoint(void); /* Processing the instructions */ diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index dfade54..98300ae 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -22,6 +22,8 @@ #include "migration/snapshot.h" static bool replay_is_debugging; +static int64_t replay_last_breakpoint; +static int64_t replay_last_snapshot; bool replay_running_debug(void) { @@ -249,3 +251,72 @@ bool replay_reverse_step(void) return false; } + +static void replay_continue_end(void) +{ + replay_is_debugging = false; + vm_stop(RUN_STATE_DEBUG); + replay_break(-1LL, NULL, NULL); +} + +static void replay_continue_stop(void *opaque) +{ + Error *err = NULL; + if (replay_last_breakpoint != -1LL) { + replay_seek(replay_last_breakpoint, replay_stop_vm_debug, &err); + if (err) { + error_free(err); + replay_continue_end(); + } + return; + } + /* + * No breakpoints since the last snapshot. + * Find previous snapshot and try again. + */ + if (replay_last_snapshot != 0) { + replay_seek(replay_last_snapshot - 1, replay_continue_stop, &err); + if (err) { + error_free(err); + replay_continue_end(); + } + replay_last_snapshot = replay_get_current_step(); + return; + } else { + /* Seek to the very first step */ + replay_seek(0, replay_stop_vm_debug, &err); + if (err) { + error_free(err); + replay_continue_end(); + } + return; + } + replay_continue_end(); +} + +bool replay_reverse_continue(void) +{ + Error *err = NULL; + + assert(replay_mode == REPLAY_MODE_PLAY); + + if (replay_get_current_step() != 0) { + replay_seek(replay_get_current_step() - 1, replay_continue_stop, &err); + if (err) { + error_free(err); + return false; + } + replay_last_breakpoint = -1LL; + replay_is_debugging = true; + replay_last_snapshot = replay_get_current_step(); + return true; + } + + return false; +} + +void replay_breakpoint(void) +{ + assert(replay_mode == REPLAY_MODE_PLAY); + replay_last_breakpoint = replay_get_current_step(); +} diff --git a/stubs/replay.c b/stubs/replay.c index 521552f..ee64972 100644 --- a/stubs/replay.c +++ b/stubs/replay.c @@ -85,3 +85,8 @@ bool replay_reverse_step(void) { return false; } + +bool replay_reverse_continue(void) +{ + return false; +} From patchwork Wed Jan 9 12:13:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022402 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZSyT6VJVz9sBQ for ; Wed, 9 Jan 2019 23:25:37 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49319 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCvP-00054t-Ss for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:25:35 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33612) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjM-0004Fu-1S for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:08 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCjK-00025q-Ur for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:07 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37394) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjJ-00024m-SU for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:06 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 6BD9554006B; Wed, 9 Jan 2019 15:13:04 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:13:04 +0300 Message-ID: <154703598429.13472.18387436180159033352.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 18/21] replay: describe reverse debugging in docs/replay.txt 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch updates the documentation and describes usage of the reverse debugging in QEMU+GDB. Signed-off-by: Pavel Dovgalyuk --- docs/replay.txt | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/docs/replay.txt b/docs/replay.txt index 2c2c5f6..8447fdd 100644 --- a/docs/replay.txt +++ b/docs/replay.txt @@ -293,6 +293,39 @@ for recording and replaying must contain identical number of ports in record and replay modes, but their backends may differ. E.g., '-serial stdio' in record mode, and '-serial null' in replay mode. +Reverse debugging +----------------- + +Reverse debugging allows "executing" the program in reverse direction. +GDB remote protocol supports "reverse step" and "reverse continue" +commands. The first one steps single instruction backwards in time, +and the second one finds the last breakpoint in the past. + +Recorded executions may be used to enable reverse debugging. QEMU can't +execute the code in backwards direction, but can load a snapshot and +replay forward to find the desired position or breakpoint. + +The following GDB commands are supported: + - reverse-stepi (or rsi) - step one instruction backwards + - reverse-continue (or rc) - find last breakpoint in the past + +Reverse step loads the nearest snapshot and replays the execution until +the required instruction is met. + +Reverse continue may include several passes of examining the execution +between the snapshots. Each of the passes include the following steps: + 1. loading the snapshot + 2. replaying to examine the breakpoints + 3. if breakpoint or watchpoint was met + - loading the snaphot again + - replaying to the required breakpoint + 4. else + - proceeding to the p.1 with the earlier snapshot + +Therefore usage of the reverse debugging requires at least one snapshot +created in advance. See the "Snapshotting" section to learn about running +record/replay and creating the snapshot in these modes. + Replay log format ----------------- From patchwork Wed Jan 9 12:13:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022404 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZT0F2f1rz9sBQ for ; Wed, 9 Jan 2019 23:27:09 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49738 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCws-0006HU-VP for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:27:07 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33645) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjR-0004KE-0L for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCjP-000288-PJ for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:12 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37416) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjP-00027i-DE for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:11 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 59732540081; Wed, 9 Jan 2019 15:13:10 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:13:10 +0300 Message-ID: <154703599022.13472.1704009113561450219.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 19/21] replay: add BH oneshot event for block layer 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Replay is capable of recording normal BH events, but sometimes there are single use callbacks scheduled with aio_bh_schedule_oneshot function. This patch enables recording and replaying such callbacks. Block layer uses these events for calling the completion function. Replaying these calls makes the execution deterministic. Signed-off-by: Pavel Dovgalyuk --- v6: - moved stub function to the separate file for fixing linux-user build --- block/block-backend.c | 5 +++-- include/sysemu/replay.h | 3 +++ replay/replay-events.c | 16 ++++++++++++++++ replay/replay-internal.h | 1 + replay/replay.c | 2 +- stubs/Makefile.objs | 1 + stubs/replay-user.c | 9 +++++++++ 7 files changed, 34 insertions(+), 3 deletions(-) create mode 100644 stubs/replay-user.c diff --git a/block/block-backend.c b/block/block-backend.c index 60d37a0..41ee871 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -17,6 +17,7 @@ #include "block/throttle-groups.h" #include "sysemu/blockdev.h" #include "sysemu/sysemu.h" +#include "sysemu/replay.h" #include "qapi/error.h" #include "qapi/qapi-events-block.h" #include "qemu/id.h" @@ -1380,8 +1381,8 @@ static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, acb->has_returned = true; if (acb->rwco.ret != NOT_DONE) { - aio_bh_schedule_oneshot(blk_get_aio_context(blk), - blk_aio_complete_bh, acb); + replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), + blk_aio_complete_bh, acb); } return &acb->common; diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 5baf10a..eaad320 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -164,6 +164,9 @@ bool replay_events_enabled(void); void replay_flush_events(void); /*! Adds bottom half event to the queue */ void replay_bh_schedule_event(QEMUBH *bh); +/* Adds oneshot bottom half event to the queue */ +void replay_bh_schedule_oneshot_event(AioContext *ctx, + QEMUBHFunc *cb, void *opaque); /*! Adds input event to the queue */ void replay_input_event(QemuConsole *src, InputEvent *evt); /*! Adds input sync event to the queue */ diff --git a/replay/replay-events.c b/replay/replay-events.c index d9a2d49..fc9b082 100644 --- a/replay/replay-events.c +++ b/replay/replay-events.c @@ -37,6 +37,9 @@ static void replay_run_event(Event *event) case REPLAY_ASYNC_EVENT_BH: aio_bh_call(event->opaque); break; + case REPLAY_ASYNC_EVENT_BH_ONESHOT: + ((QEMUBHFunc *)event->opaque)(event->opaque2); + break; case REPLAY_ASYNC_EVENT_INPUT: qemu_input_event_send_impl(NULL, (InputEvent *)event->opaque); qapi_free_InputEvent((InputEvent *)event->opaque); @@ -132,6 +135,17 @@ void replay_bh_schedule_event(QEMUBH *bh) } } +void replay_bh_schedule_oneshot_event(AioContext *ctx, + QEMUBHFunc *cb, void *opaque) +{ + if (events_enabled) { + uint64_t id = replay_get_current_step(); + replay_add_event(REPLAY_ASYNC_EVENT_BH_ONESHOT, cb, opaque, id); + } else { + aio_bh_schedule_oneshot(ctx, cb, opaque); + } +} + void replay_add_input_event(struct InputEvent *event) { replay_add_event(REPLAY_ASYNC_EVENT_INPUT, event, NULL, 0); @@ -162,6 +176,7 @@ static void replay_save_event(Event *event, int checkpoint) /* save event-specific data */ switch (event->event_kind) { case REPLAY_ASYNC_EVENT_BH: + case REPLAY_ASYNC_EVENT_BH_ONESHOT: replay_put_qword(event->id); break; case REPLAY_ASYNC_EVENT_INPUT: @@ -217,6 +232,7 @@ static Event *replay_read_event(int checkpoint) /* Events that has not to be in the queue */ switch (replay_state.read_event_kind) { case REPLAY_ASYNC_EVENT_BH: + case REPLAY_ASYNC_EVENT_BH_ONESHOT: if (replay_state.read_event_id == -1) { replay_state.read_event_id = replay_get_qword(); } diff --git a/replay/replay-internal.h b/replay/replay-internal.h index e37b201..af2b941 100644 --- a/replay/replay-internal.h +++ b/replay/replay-internal.h @@ -51,6 +51,7 @@ enum ReplayEvents { enum ReplayAsyncEventKind { REPLAY_ASYNC_EVENT_BH, + REPLAY_ASYNC_EVENT_BH_ONESHOT, REPLAY_ASYNC_EVENT_INPUT, REPLAY_ASYNC_EVENT_INPUT_SYNC, REPLAY_ASYNC_EVENT_CHAR_READ, diff --git a/replay/replay.c b/replay/replay.c index 3996499..fdf1778 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -22,7 +22,7 @@ /* Current version of the replay mechanism. Increase it when file format changes. */ -#define REPLAY_VERSION 0xe02007 +#define REPLAY_VERSION 0xe02008 /* Size of replay log header */ #define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t)) diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs index 5dd0aee..8e8df1e 100644 --- a/stubs/Makefile.objs +++ b/stubs/Makefile.objs @@ -24,6 +24,7 @@ stub-obj-y += monitor.o stub-obj-y += notify-event.o stub-obj-y += qtest.o stub-obj-y += replay.o +stub-obj-y += replay-user.o stub-obj-y += runstate-check.o stub-obj-y += set-fd-handler.o stub-obj-y += slirp.o diff --git a/stubs/replay-user.c b/stubs/replay-user.c new file mode 100644 index 0000000..2ad9e27 --- /dev/null +++ b/stubs/replay-user.c @@ -0,0 +1,9 @@ +#include "qemu/osdep.h" +#include "sysemu/replay.h" +#include "sysemu/sysemu.h" + +void replay_bh_schedule_oneshot_event(AioContext *ctx, + QEMUBHFunc *cb, void *opaque) +{ + aio_bh_schedule_oneshot(ctx, cb, opaque); +} From patchwork Wed Jan 9 12:13:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022408 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZT7S1Q3Gz9sBQ for ; Wed, 9 Jan 2019 23:33:24 +1100 (AEDT) Received: from localhost ([127.0.0.1]:51400 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghD2w-0002qK-3d for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:33:22 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33667) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjh-0004Y5-K0 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCje-0002CH-Q6 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:29 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37440) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjY-00029e-7J for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:23 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 34938540081; Wed, 9 Jan 2019 15:13:16 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:13:16 +0300 Message-ID: <154703599610.13472.9352099028065886270.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 20/21] replay: init rtc after enabling the replay 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch postpones the call of 'configure_rtc' function. This call uses host clock to configure the rtc, but host clock access should be recorded when using icount record/replay mode. Therefore now rtc is configured after switching record/replay mode on. Signed-off-by: Pavel Dovgalyuk --- vl.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/vl.c b/vl.c index 95fc44a..c2d5aca 100644 --- a/vl.c +++ b/vl.c @@ -3008,6 +3008,7 @@ int main(int argc, char **argv, char **envp) DisplayState *ds; QemuOpts *opts, *machine_opts; QemuOpts *icount_opts = NULL, *accel_opts = NULL; + QemuOpts *rtc_opts = NULL; QemuOptsList *olist; int optind; const char *optarg; @@ -3814,9 +3815,9 @@ int main(int argc, char **argv, char **envp) warn_report("This option is ignored and will be removed soon"); break; case QEMU_OPTION_rtc: - opts = qemu_opts_parse_noisily(qemu_find_opts("rtc"), optarg, - false); - if (!opts) { + rtc_opts = qemu_opts_parse_noisily(qemu_find_opts("rtc"), + optarg, false); + if (!rtc_opts) { exit(1); } break; @@ -4029,6 +4030,9 @@ int main(int argc, char **argv, char **envp) loc_set_none(); replay_configure(icount_opts); + if (rtc_opts) { + configure_rtc(rtc_opts); + } if (incoming && !preconfig_exit_requested) { error_report("'preconfig' and 'incoming' options are " From patchwork Wed Jan 9 12:13:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 1022405 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=209.51.188.17; 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 [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43ZT1Q22KHz9sDL for ; Wed, 9 Jan 2019 23:28:10 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49993 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCxs-00074X-31 for incoming@patchwork.ozlabs.org; Wed, 09 Jan 2019 07:28:08 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33697) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjr-0004gO-71 for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghCjp-0002Fw-Bg for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:39 -0500 Received: from mail.ispras.ru ([83.149.199.45]:37474) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghCjn-0002BE-Av for qemu-devel@nongnu.org; Wed, 09 Jan 2019 07:13:36 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 06F1454006A; Wed, 9 Jan 2019 15:13:22 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 09 Jan 2019 15:13:21 +0300 Message-ID: <154703600185.13472.14578327407784304841.stgit@pasha-VirtualBox> In-Reply-To: <154703587757.13472.3898702635363120794.stgit@pasha-VirtualBox> References: <154703587757.13472.3898702635363120794.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 X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v9 21/21] replay: document development rules 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, crosthwaite.peter@gmail.com, ciro.santilli@gmail.com, jasowang@redhat.com, quintela@redhat.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, dovgaluk@ispras.ru, artem.k.pisarenko@gmail.com, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch introduces docs/devel/replay.txt which describes the rules that should be followed to make virtual devices usable in record/replay mode. Signed-off-by: Pavel Dovgalyuk --- v9: fixed external virtual clock description (reported by Artem Pisarenko) --- docs/devel/replay.txt | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 docs/devel/replay.txt diff --git a/docs/devel/replay.txt b/docs/devel/replay.txt new file mode 100644 index 0000000..e641c35 --- /dev/null +++ b/docs/devel/replay.txt @@ -0,0 +1,46 @@ +Record/replay mechanism, that could be enabled through icount mode, expects +the virtual devices to satisfy the following requirements. + +The main idea behind this document is that everything that affects +the guest state during execution in icount mode should be deterministic. + +Timers +====== + +All virtual devices should use virtual clock for timers that change the guest +state. Virtual clock is deterministic, therefore such timers are deterministic +too. + +Virtual devices can also use realtime clock for the events that do not change +the guest state directly. When the clock ticking should depend on VM execution +speed, use virtual clock with EXTERNAL attribute. It is not deterministic, +but its speed depends on the guest execution. This clock is used by +the virtual devices (e.g., slirp routing device) that lie outside the +replayed guest. + +Bottom halves +============= + +Bottom half callbacks, that affect the guest state, should be invoked through +replay_bh_schedule_event or replay_bh_schedule_oneshot_event functions. +Their invocations are saved in record mode and synchronized with the existing +log in replay mode. + +Saving/restoring the VM state +============================= + +All fields in the device state structure (including virtual timers) +should be restored by loadvm to the same values they had before savevm. + +Avoid accessing other devices' state, because the order of saving/restoring +is not defined. It means that you should not call functions like +'update_irq' in post_load callback. Save everything explicitly to avoid +the dependencies that may make restoring the VM state non-deterministic. + +Stopping the VM +=============== + +Stopping the guest should not interfere with its state (with the exception +of the network connections, that could be broken by the remote timeouts). +VM can be stopped at any moment of replay by the user. Restarting the VM +after that stop should not break the replay by the unneeded guest state change.