From nobody Wed Nov 27 02:25:45 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=oracle.com ARC-Seal: i=1; a=rsa-sha256; t=1701883094; cv=none; d=zohomail.com; s=zohoarc; b=bFZuSF+eJ6tYVk5QNPKofjDM8gx26QQsYxi5rkjEEOnBgo6sc2K8tWmt2ny500C8NI9n1fGEiTWkKCrlsKGY5feBoWujoIUdQKXuljK0W5BOEWmzAYMlTJ/4Nd4q5HycZ4+IOJlm1nFFVfv7TEoGUa3R6lmLSvjVNR6NywtKH/w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1701883094; h=Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=7r47Pue9XL+J9wl9bbIYyHu5FgRAV/eyOGMK/N66L0o=; b=IXecovmonzgjHrMVABI6hi93D7e6XFZIT+kWuaw/plpJiCo1a7LKAeB3f7udBRwBkT96MqxeEpZvz8vxvMPUlZOg28XS1PkMFycgs8ZvMbZ/VpxUtIdz1bpUmWo4EXxGeFSz/a9jLWuzBI4OZM9FdarGekvHFaW7CJgxFde8YI8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 170188309463860.25494183184185; Wed, 6 Dec 2023 09:18:14 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rAvSX-00070v-1o; Wed, 06 Dec 2023 12:13:17 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rAvSV-000701-9G for qemu-devel@nongnu.org; Wed, 06 Dec 2023 12:13:15 -0500 Received: from mx0b-00069f02.pphosted.com ([205.220.177.32]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rAvST-0001Wa-Az for qemu-devel@nongnu.org; Wed, 06 Dec 2023 12:13:15 -0500 Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3B6EY6RN006595; Wed, 6 Dec 2023 17:13:12 GMT Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3utdabt0cn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 06 Dec 2023 17:13:12 +0000 Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 3B6Gemn7032249; Wed, 6 Dec 2023 17:13:11 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3utan9exe3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 06 Dec 2023 17:13:11 +0000 Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3B6HCrVH024168; Wed, 6 Dec 2023 17:13:10 GMT Received: from ca-dev63.us.oracle.com (ca-dev63.us.oracle.com [10.211.8.221]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 3utan9ewxa-14; Wed, 06 Dec 2023 17:13:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2023-11-20; bh=7r47Pue9XL+J9wl9bbIYyHu5FgRAV/eyOGMK/N66L0o=; b=Ksdl3ErfazmXNK9HXI4JoLjQ+Dlke5feSqsCgf6bNeON14lqAGRCJ5iOVpRl5eaflv8M R28j3udxKoHtaA0365oxBxY8rOTjBLWd/83gMnQ7uVQjVSJjpKm7T4YhiF63CS9Td8BT Md1OSiUFMwmaKpy1ugXFUst1lv3k/k0kdp/AeNlaNvyREYIUHwof4phC3bCGqrgwHPRm VZjZGeb5yVec4ZHaRYYxzZwVEHuXqCeYrKLVz6jHGBOVmHbCZJP7Ad6vvXtqw1H1BkY0 JIMbC8rXWwpyLlkzxC3QglRixRnJ6DrF2mmlJhr4TpIJSShJumCHSqqWF5LDuyYZoemB 8w== From: Steve Sistare To: qemu-devel@nongnu.org Cc: Juan Quintela , Peter Xu , Paolo Bonzini , Thomas Huth , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Fabiano Rosas , Leonardo Bras , Steve Sistare Subject: [PATCH V7 07/12] migration: preserve suspended for snapshot Date: Wed, 6 Dec 2023 09:12:39 -0800 Message-Id: <1701882772-356078-14-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1701882772-356078-1-git-send-email-steven.sistare@oracle.com> References: <1701882772-356078-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-06_15,2023-12-06_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 suspectscore=0 mlxscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312060140 X-Proofpoint-ORIG-GUID: vx01LB19Z5b4PrWLIBoM9dcBMFP2deWA X-Proofpoint-GUID: vx01LB19Z5b4PrWLIBoM9dcBMFP2deWA Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1701883098020100007 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Restoring a snapshot can break a suspended guest. Snapshots suffer from the same suspended-state issues that affect live migration, plus they must handle an additional problematic scenario, which is that a running vm must remain running if it loads a suspended snapshot. To save, the existing vm_stop call now completely stops the suspended state. Finish with vm_resume to leave the vm in the state it had prior to the save, correctly restoring the suspended state. To load, if the snapshot is not suspended, then vm_stop + vm_resume correctly handles all states, and leaves the vm in the state it had prior to the load. However, if the snapshot is suspended, restoration is trickier. First, call vm_resume to restore the state to suspended so the current state matches the saved state. Then, if the pre-load state is running, call wakeup to resume running. Prior to these changes, the vm_stop to RUN_STATE_SAVE_VM and RUN_STATE_RESTORE_VM did not change runstate if the current state was suspended, but now it does, so allow these transitions. Signed-off-by: Steve Sistare Reviewed-by: Peter Xu --- include/migration/snapshot.h | 7 +++++++ migration/migration-hmp-cmds.c | 8 +++++--- migration/savevm.c | 23 +++++++++++++---------- system/runstate.c | 5 +++++ system/vl.c | 2 ++ 5 files changed, 32 insertions(+), 13 deletions(-) diff --git a/include/migration/snapshot.h b/include/migration/snapshot.h index e72083b..9e4dcaa 100644 --- a/include/migration/snapshot.h +++ b/include/migration/snapshot.h @@ -16,6 +16,7 @@ #define QEMU_MIGRATION_SNAPSHOT_H =20 #include "qapi/qapi-builtin-types.h" +#include "qapi/qapi-types-run-state.h" =20 /** * save_snapshot: Save an internal snapshot. @@ -61,4 +62,10 @@ bool delete_snapshot(const char *name, bool has_devices, strList *devices, Error **errp); =20 +/** + * load_snapshot_resume: Restore runstate after loading snapshot. + * @state: state to restore + */ +void load_snapshot_resume(RunState state); + #endif diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c index 86ae832..c8d70bc 100644 --- a/migration/migration-hmp-cmds.c +++ b/migration/migration-hmp-cmds.c @@ -399,15 +399,17 @@ void hmp_info_migrate_parameters(Monitor *mon, const = QDict *qdict) =20 void hmp_loadvm(Monitor *mon, const QDict *qdict) { - int saved_vm_running =3D runstate_is_running(); + RunState saved_state =3D runstate_get(); + const char *name =3D qdict_get_str(qdict, "name"); Error *err =3D NULL; =20 vm_stop(RUN_STATE_RESTORE_VM); =20 - if (load_snapshot(name, NULL, false, NULL, &err) && saved_vm_running) { - vm_start(); + if (load_snapshot(name, NULL, false, NULL, &err)) { + load_snapshot_resume(saved_state); } + hmp_handle_error(mon, err); } =20 diff --git a/migration/savevm.c b/migration/savevm.c index eec5503..26866f0 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -3046,7 +3046,7 @@ bool save_snapshot(const char *name, bool overwrite, = const char *vmstate, QEMUSnapshotInfo sn1, *sn =3D &sn1; int ret =3D -1, ret2; QEMUFile *f; - int saved_vm_running; + RunState saved_state =3D runstate_get(); uint64_t vm_state_size; g_autoptr(GDateTime) now =3D g_date_time_new_now_local(); AioContext *aio_context; @@ -3094,8 +3094,6 @@ bool save_snapshot(const char *name, bool overwrite, = const char *vmstate, } aio_context =3D bdrv_get_aio_context(bs); =20 - saved_vm_running =3D runstate_is_running(); - global_state_store(); vm_stop(RUN_STATE_SAVE_VM); =20 @@ -3163,9 +3161,7 @@ bool save_snapshot(const char *name, bool overwrite, = const char *vmstate, =20 bdrv_drain_all_end(); =20 - if (saved_vm_running) { - vm_start(); - } + vm_resume(saved_state); return ret =3D=3D 0; } =20 @@ -3339,6 +3335,14 @@ err_drain: return false; } =20 +void load_snapshot_resume(RunState state) +{ + vm_resume(state); + if (state =3D=3D RUN_STATE_RUNNING && runstate_get() =3D=3D RUN_STATE_= SUSPENDED) { + qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, &error_abort); + } +} + bool delete_snapshot(const char *name, bool has_devices, strList *devices, Error **errp) { @@ -3403,16 +3407,15 @@ static void snapshot_load_job_bh(void *opaque) { Job *job =3D opaque; SnapshotJob *s =3D container_of(job, SnapshotJob, common); - int orig_vm_running; + RunState orig_state =3D runstate_get(); =20 job_progress_set_remaining(&s->common, 1); =20 - orig_vm_running =3D runstate_is_running(); vm_stop(RUN_STATE_RESTORE_VM); =20 s->ret =3D load_snapshot(s->tag, s->vmstate, true, s->devices, s->errp= ); - if (s->ret && orig_vm_running) { - vm_start(); + if (s->ret) { + load_snapshot_resume(orig_state); } =20 job_progress_update(&s->common, 1); diff --git a/system/runstate.c b/system/runstate.c index e2fa204..ca9eb54 100644 --- a/system/runstate.c +++ b/system/runstate.c @@ -77,6 +77,7 @@ typedef struct { =20 static const RunStateTransition runstate_transitions_def[] =3D { { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE }, + { RUN_STATE_PRELAUNCH, RUN_STATE_SUSPENDED }, =20 { RUN_STATE_DEBUG, RUN_STATE_RUNNING }, { RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE }, @@ -132,6 +133,7 @@ static const RunStateTransition runstate_transitions_de= f[] =3D { =20 { RUN_STATE_RESTORE_VM, RUN_STATE_RUNNING }, { RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH }, + { RUN_STATE_RESTORE_VM, RUN_STATE_SUSPENDED }, =20 { RUN_STATE_COLO, RUN_STATE_RUNNING }, { RUN_STATE_COLO, RUN_STATE_PRELAUNCH }, @@ -150,6 +152,7 @@ static const RunStateTransition runstate_transitions_de= f[] =3D { { RUN_STATE_RUNNING, RUN_STATE_COLO}, =20 { RUN_STATE_SAVE_VM, RUN_STATE_RUNNING }, + { RUN_STATE_SAVE_VM, RUN_STATE_SUSPENDED }, =20 { RUN_STATE_SHUTDOWN, RUN_STATE_PAUSED }, { RUN_STATE_SHUTDOWN, RUN_STATE_FINISH_MIGRATE }, @@ -163,6 +166,8 @@ static const RunStateTransition runstate_transitions_de= f[] =3D { { RUN_STATE_SUSPENDED, RUN_STATE_PRELAUNCH }, { RUN_STATE_SUSPENDED, RUN_STATE_COLO}, { RUN_STATE_SUSPENDED, RUN_STATE_PAUSED}, + { RUN_STATE_SUSPENDED, RUN_STATE_SAVE_VM }, + { RUN_STATE_SUSPENDED, RUN_STATE_RESTORE_VM }, =20 { RUN_STATE_WATCHDOG, RUN_STATE_RUNNING }, { RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE }, diff --git a/system/vl.c b/system/vl.c index 2bcd9ef..2fbbbba 100644 --- a/system/vl.c +++ b/system/vl.c @@ -2706,7 +2706,9 @@ void qmp_x_exit_preconfig(Error **errp) qemu_machine_creation_done(); =20 if (loadvm) { + RunState state =3D autostart ? RUN_STATE_RUNNING : runstate_get(); load_snapshot(loadvm, NULL, false, NULL, &error_fatal); + load_snapshot_resume(state); } if (replay_mode !=3D REPLAY_MODE_NONE) { replay_vmstate_init(); --=20 1.8.3.1