From patchwork Thu Feb 21 11:04:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 10823691 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 03FCE6C2 for ; Thu, 21 Feb 2019 11:11:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E08CE304A7 for ; Thu, 21 Feb 2019 11:11:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CFFCE304A9; Thu, 21 Feb 2019 11:11:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6A9C1304A7 for ; Thu, 21 Feb 2019 11:11:40 +0000 (UTC) Received: from localhost ([127.0.0.1]:58371 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gwmGP-0005ya-Ul for patchwork-qemu-devel@patchwork.kernel.org; Thu, 21 Feb 2019 06:11:38 -0500 Received: from eggs.gnu.org ([209.51.188.92]:33841) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gwm9d-0007uN-6p for qemu-devel@nongnu.org; Thu, 21 Feb 2019 06:04:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gwm9W-0004ac-3g for qemu-devel@nongnu.org; Thu, 21 Feb 2019 06:04:36 -0500 Received: from mail.ispras.ru ([83.149.199.45]:35838) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gwm9S-0004Y1-7E for qemu-devel@nongnu.org; Thu, 21 Feb 2019 06:04:27 -0500 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 3EEDB54006B; Thu, 21 Feb 2019 14:04:24 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Thu, 21 Feb 2019 14:04:26 +0300 Message-ID: <155074706670.32129.8466692547438148011.stgit@pasha-VirtualBox> In-Reply-To: <155074704329.32129.17530905097298071558.stgit@pasha-VirtualBox> References: <155074704329.32129.17530905097298071558.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 v13 04/25] 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 3497585f5a..2c2c5f6118 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.