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Fri, 21 Jun 2024 14:32:29 +0000 From: Elena Ufimtseva To: qemu-devel@nongnu.org Cc: eduardo@habkost.net, marcel.apfelbaum@gmail.com, philmd@linaro.org, wangyanan55@huawei.com, peterx@redhat.com, farosas@suse.de, eblake@redhat.com, armbru@redhat.com Subject: [PATCH RFC 2/2] migration: abort on destination if switchover limit exceeded Date: Fri, 21 Jun 2024 07:32:21 -0700 Message-Id: <20240621143221.198784-3-elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240621143221.198784-1-elena.ufimtseva@oracle.com> References: <20240621143221.198784-1-elena.ufimtseva@oracle.com> X-ClientProxiedBy: SJ0PR13CA0042.namprd13.prod.outlook.com (2603:10b6:a03:2c2::17) To IA1PR10MB6172.namprd10.prod.outlook.com (2603:10b6:208:3a4::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR10MB6172:EE_|BN0PR10MB4903:EE_ X-MS-Office365-Filtering-Correlation-Id: bdc23f1c-f35c-4089-d162-08dc91fefaa0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230037|1800799021|366013|376011; 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envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org During live migration, receive current downtime from source and start a downtime timer. When the destination dowtime and added source downtime exceeds downtime limit for more than switchover limit, abort live migration on destination. Signed-off-by: Elena Ufimtseva --- migration/migration.c | 2 ++ migration/migration.h | 15 ++++++++++ migration/savevm.c | 68 ++++++++++++++++++++++++++++++++++++++++++ migration/savevm.h | 2 ++ migration/trace-events | 3 ++ 5 files changed, 90 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index 5cc304d2db..64d7290997 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -240,6 +240,8 @@ void migration_object_init(void) current_incoming->page_requested = g_tree_new(page_request_addr_cmp); current_incoming->exit_on_error = INMIGRATE_DEFAULT_EXIT_ON_ERROR; + /* Downtime will start when source sends its current downtime. */ + current_incoming->downtime_start = 0; migration_object_check(current_migration, &error_fatal); diff --git a/migration/migration.h b/migration/migration.h index aa56b70795..06f4ebe214 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -230,6 +230,21 @@ struct MigrationIncomingState { /* Do exit on incoming migration failure */ bool exit_on_error; + + /* Initial downtime on destination set by MIG_CMD_SEND_SRC_DOWNTIME */ + uint64_t downtime_start; + /* + * Current donwtime on destination that initially set equal to source by + * MIG_CMD_SEND_SRC_DOWNTIME, then updated by destination itself. + */ + uint64_t downtime_now; + /* + * Abort live migration on destination when current destination downtime + * exceeds the abort_limit. abort_limit is being set by + * MIG_CMD_SEND_SRC_DOWNTIME sent from source. + */ + uint64_t abort_limit; + uint64_t src_downtime; }; MigrationIncomingState *migration_incoming_get_current(void); diff --git a/migration/savevm.c b/migration/savevm.c index 031ab03915..f3b5ea98bf 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -90,6 +90,7 @@ enum qemu_vm_cmd { MIG_CMD_ENABLE_COLO, /* Enable COLO */ MIG_CMD_POSTCOPY_RESUME, /* resume postcopy on dest */ MIG_CMD_RECV_BITMAP, /* Request for recved bitmap on dst */ + MIG_CMD_SEND_SRC_DOWNTIME, /* Send current downtime to dst */ MIG_CMD_MAX }; @@ -109,6 +110,7 @@ static struct mig_cmd_args { [MIG_CMD_POSTCOPY_RESUME] = { .len = 0, .name = "POSTCOPY_RESUME" }, [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, [MIG_CMD_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, + [MIG_CMD_SEND_SRC_DOWNTIME] = { .len = -1, .name = "SEND_SRC_DOWNTIME" }, [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, }; @@ -1218,6 +1220,18 @@ void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name) qemu_savevm_command_send(f, MIG_CMD_RECV_BITMAP, len + 1, (uint8_t *)buf); } +void qemu_savevm_send_downtime(QEMUFile *f, int64_t abort_limit_ms, + int64_t source_downtime) +{ + uint64_t tmp[2]; + tmp[0] = cpu_to_be64(abort_limit_ms); + tmp[1] = cpu_to_be64(source_downtime); + + trace_qemu_savevm_send_downtime(abort_limit_ms, source_downtime); + qemu_savevm_command_send(f, MIG_CMD_SEND_SRC_DOWNTIME, + 16, (uint8_t *)tmp); +} + bool qemu_savevm_state_blocked(Error **errp) { SaveStateEntry *se; @@ -1635,6 +1649,14 @@ int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only, } } + if (migrate_switchover_abort()) { + MigrationState *s = migrate_get_current(); + uint64_t abort_limit_ms = + s->parameters.downtime_limit + s->parameters.switchover_limit; + qemu_savevm_send_downtime(f, abort_limit_ms, + migration_get_current_downtime(s)); + } + if (iterable_only) { goto flush; } @@ -1919,6 +1941,20 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis, return 0; } +static int loadvm_handle_src_downtime(MigrationIncomingState *mis, + uint16_t len) +{ + uint64_t src_abort_limit = qemu_get_be64(mis->from_src_file); + uint64_t src_current_downtime = qemu_get_be64(mis->from_src_file); + + mis->abort_limit = src_abort_limit; + mis->src_downtime = src_current_downtime; + mis->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); + + trace_loadvm_handle_src_downtime(src_abort_limit, src_current_downtime); + return 0; +} + /* After postcopy we will be told to throw some pages away since they're * dirty and will have to be demand fetched. Must happen before CPU is * started. @@ -2540,6 +2576,9 @@ static int loadvm_process_command(QEMUFile *f) case MIG_CMD_ENABLE_COLO: return loadvm_process_enable_colo(mis); + + case MIG_CMD_SEND_SRC_DOWNTIME: + return loadvm_handle_src_downtime(mis, len); } return 0; @@ -2659,6 +2698,18 @@ qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis, trace_vmstate_downtime_load("non-iterable", se->idstr, se->instance_id, end_ts - start_ts); } + if (migrate_switchover_abort() && type == QEMU_VM_SECTION_FULL && + mis->downtime_start) { + mis->downtime_now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); + uint64_t dst_downtime = mis->downtime_now - mis->downtime_start; + if (mis->src_downtime + dst_downtime >= mis->abort_limit) { + error_report("Shutdown destination migration, migration abort_limit" + "(%lu ms) was reached.", mis->abort_limit); + trace_qemu_loadvm_downtime_abort(mis->abort_limit, dst_downtime, + mis->src_downtime); + return -EINVAL; + } + } if (!check_section_footer(f, se)) { return -EINVAL; @@ -2714,6 +2765,19 @@ qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis, se->instance_id, end_ts - start_ts); } + if (migrate_switchover_abort() && type == QEMU_VM_SECTION_END && + mis->downtime_start) { + mis->downtime_now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); + uint64_t dst_downtime = mis->downtime_now - mis->downtime_start; + if (mis->src_downtime + dst_downtime >= mis->abort_limit) { + error_report("Shutdown destination migration, migration abort_limit (%lu ms)" + "was reached.", mis->abort_limit); + trace_qemu_loadvm_downtime_abort(mis->abort_limit, dst_downtime, + mis->src_downtime); + return -EINVAL; + } + } + if (!check_section_footer(f, se)) { return -EINVAL; } @@ -2901,6 +2965,10 @@ retry: } trace_qemu_loadvm_state_section(section_type); + /* Start destination timer after we receive the downtime from source. */ + if (mis->downtime_start) { + mis->downtime_now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); + } switch (section_type) { case QEMU_VM_SECTION_START: case QEMU_VM_SECTION_FULL: diff --git a/migration/savevm.h b/migration/savevm.h index 9ec96a995c..1166c341f3 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -53,6 +53,8 @@ void qemu_savevm_send_postcopy_listen(QEMUFile *f); void qemu_savevm_send_postcopy_run(QEMUFile *f); void qemu_savevm_send_postcopy_resume(QEMUFile *f); void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name); +void qemu_savevm_send_downtime(QEMUFile *f, int64_t switchover_abort_ms, + int64_t source_downtime_ms); void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, uint16_t len, diff --git a/migration/trace-events b/migration/trace-events index 0b7c3324fb..977988848a 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -54,6 +54,9 @@ postcopy_pause_incoming(void) "" postcopy_pause_incoming_continued(void) "" postcopy_page_req_sync(void *host_addr) "sync page req %p" +qemu_savevm_send_downtime(uint64_t src_abort_limit_ms, uint64_t source_downtime) "switchover abort limit=%"PRIi64", source downtime=%"PRIi64 +loadvm_handle_src_downtime(uint64_t src_abort_limit_ms, uint64_t source_downtime) "switchover abort limit=%"PRIi64", source downtime=%"PRIi64 +qemu_loadvm_downtime_abort(uint64_t abort_limit_ms, uint64_t dst_downtime, uint64_t source_downtime) "switchover abort limit=%"PRIi64", destination downtime=%"PRIi64", source downtime=%"PRIi64 # vmstate.c vmstate_load_field_error(const char *field, int ret) "field \"%s\" load failed, ret = %d" vmstate_load_state(const char *name, int version_id) "%s v%d"