From patchwork Thu Nov 5 09:17:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" X-Patchwork-Id: 1394830 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) 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=huawei.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CRdHK6MCQz9sTD for ; Thu, 5 Nov 2020 20:18:34 +1100 (AEDT) Received: from localhost ([::1]:40812 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kabPb-0000ov-9D for incoming@patchwork.ozlabs.org; Thu, 05 Nov 2020 04:18:31 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:37848) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kabPA-0000oZ-R8 for qemu-devel@nongnu.org; Thu, 05 Nov 2020 04:18:04 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:2330) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kabP8-0003Fv-0W for qemu-devel@nongnu.org; Thu, 05 Nov 2020 04:18:04 -0500 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4CRdGJ6fLNzkdBW; Thu, 5 Nov 2020 17:17:44 +0800 (CST) Received: from DESKTOP-27KDQMV.china.huawei.com (10.174.151.207) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.487.0; Thu, 5 Nov 2020 17:17:41 +0800 From: "Longpeng(Mike)" To: , Subject: [PATCH] migration: handle CANCELLING state in migration_completion() Date: Thu, 5 Nov 2020 17:17:26 +0800 Message-ID: <20201105091726.148-1-longpeng2@huawei.com> X-Mailer: git-send-email 2.25.0.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.151.207] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.190; envelope-from=longpeng2@huawei.com; helo=szxga04-in.huawei.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/05 04:17:52 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: longpeng2@huawei.com, arei.gonglei@huawei.com, huangzhichao@huawei.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The following sequence may cause the VM abort during migration: 1. RUN_STATE_RUNNING,MIGRATION_STATUS_ACTIVE 2. before call migration_completion(), we send migrate_cancel QMP command, the state machine is changed to: RUN_STATE_RUNNING,MIGRATION_STATUS_CANCELLING 3. call migration_completion(), and the state machine is switch to: RUN_STATE_RUNNING,MIGRATION_STATUS_COMPLETED 4. call migration_iteration_finish(), because the migration status is COMPLETED, so it will try to set the runstate to POSTMIGRATE, but RUNNING-->POSTMIGRATE is an invalid transition, so abort(). The migration_completion() should not change the migration state to COMPLETED if it is already changed to CANCELLING. Signed-off-by: Longpeng(Mike) Reviewed-by: Dr. David Alan Gilbert --- migration/migration.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index 3263aa5..b11a2bd 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -3061,6 +3061,8 @@ static void migration_completion(MigrationState *s) qemu_savevm_state_complete_postcopy(s->to_dst_file); trace_migration_completion_postcopy_end_after_complete(); + } else if (s->state == MIGRATION_STATUS_CANCELLING) { + goto fail; } /*