[PULL 14/15] migration/colo: wrap incoming checkpoint process into new helper

[Juan Quintela <quintela@redhat.com>]

From: zhanghailiang <zhang.zhanghailiang@huawei.com>

Split checkpoint incoming process into a helper.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/colo.c | 260 ++++++++++++++++++++++++-----------------------
 1 file changed, 133 insertions(+), 127 deletions(-)

diff --git a/migration/colo.c b/migration/colo.c
index 2c88aa57a2..93c5a452fb 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -664,13 +664,138 @@ void migrate_start_colo_process(MigrationState *s)
     qemu_mutex_lock_iothread();
 }
 
-static void colo_wait_handle_message(QEMUFile *f, int *checkpoint_request,
-                                     Error **errp)
+static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
+                      QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
+{
+    uint64_t total_size;
+    uint64_t value;
+    Error *local_err = NULL;
+    int ret;
+
+    qemu_mutex_lock_iothread();
+    vm_stop_force_state(RUN_STATE_COLO);
+    trace_colo_vm_state_change("run", "stop");
+    qemu_mutex_unlock_iothread();
+
+    /* FIXME: This is unnecessary for periodic checkpoint mode */
+    colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
+                 &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    colo_receive_check_message(mis->from_src_file,
+                       COLO_MESSAGE_VMSTATE_SEND, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    qemu_mutex_lock_iothread();
+    cpu_synchronize_all_pre_loadvm();
+    ret = qemu_loadvm_state_main(mis->from_src_file, mis);
+    qemu_mutex_unlock_iothread();
+
+    if (ret < 0) {
+        error_setg(errp, "Load VM's live state (ram) error");
+        return;
+    }
+
+    value = colo_receive_message_value(mis->from_src_file,
+                             COLO_MESSAGE_VMSTATE_SIZE, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    /*
+     * Read VM device state data into channel buffer,
+     * It's better to re-use the memory allocated.
+     * Here we need to handle the channel buffer directly.
+     */
+    if (value > bioc->capacity) {
+        bioc->capacity = value;
+        bioc->data = g_realloc(bioc->data, bioc->capacity);
+    }
+    total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
+    if (total_size != value) {
+        error_setg(errp, "Got %" PRIu64 " VMState data, less than expected"
+                    " %" PRIu64, total_size, value);
+        return;
+    }
+    bioc->usage = total_size;
+    qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
+
+    colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
+                 &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    qemu_mutex_lock_iothread();
+    vmstate_loading = true;
+    ret = qemu_load_device_state(fb);
+    if (ret < 0) {
+        error_setg(errp, "COLO: load device state failed");
+        qemu_mutex_unlock_iothread();
+        return;
+    }
+
+#ifdef CONFIG_REPLICATION
+    replication_get_error_all(&local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        qemu_mutex_unlock_iothread();
+        return;
+    }
+
+    /* discard colo disk buffer */
+    replication_do_checkpoint_all(&local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        qemu_mutex_unlock_iothread();
+        return;
+    }
+#else
+    abort();
+#endif
+    /* Notify all filters of all NIC to do checkpoint */
+    colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
+
+    if (local_err) {
+        error_propagate(errp, local_err);
+        qemu_mutex_unlock_iothread();
+        return;
+    }
+
+    vmstate_loading = false;
+    vm_start();
+    trace_colo_vm_state_change("stop", "run");
+    qemu_mutex_unlock_iothread();
+
+    if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
+        failover_set_state(FAILOVER_STATUS_RELAUNCH,
+                        FAILOVER_STATUS_NONE);
+        failover_request_active(NULL);
+        return;
+    }
+
+    colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
+                 &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+    }
+}
+
+static void colo_wait_handle_message(MigrationIncomingState *mis,
+                QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
 {
     COLOMessage msg;
     Error *local_err = NULL;
 
-    msg = colo_receive_message(f, &local_err);
+    msg = colo_receive_message(mis->from_src_file, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -678,10 +803,9 @@ static void colo_wait_handle_message(QEMUFile *f, int *checkpoint_request,
 
     switch (msg) {
     case COLO_MESSAGE_CHECKPOINT_REQUEST:
-        *checkpoint_request = 1;
+        colo_incoming_process_checkpoint(mis, fb, bioc, errp);
         break;
     default:
-        *checkpoint_request = 0;
         error_setg(errp, "Got unknown COLO message: %d", msg);
         break;
     }
@@ -692,10 +816,7 @@ void *colo_process_incoming_thread(void *opaque)
     MigrationIncomingState *mis = opaque;
     QEMUFile *fb = NULL;
     QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
-    uint64_t total_size;
-    uint64_t value;
     Error *local_err = NULL;
-    int ret;
 
     rcu_register_thread();
     qemu_sem_init(&mis->colo_incoming_sem, 0);
@@ -749,134 +870,19 @@ void *colo_process_incoming_thread(void *opaque)
     }
 
     while (mis->state == MIGRATION_STATUS_COLO) {
-        int request = 0;
-
-        colo_wait_handle_message(mis->from_src_file, &request, &local_err);
+        colo_wait_handle_message(mis, fb, bioc, &local_err);
         if (local_err) {
-            goto out;
+            error_report_err(local_err);
+            break;
         }
-        assert(request);
         if (failover_get_state() != FAILOVER_STATUS_NONE) {
             error_report("failover request");
-            goto out;
-        }
-
-        qemu_mutex_lock_iothread();
-        vm_stop_force_state(RUN_STATE_COLO);
-        trace_colo_vm_state_change("run", "stop");
-        qemu_mutex_unlock_iothread();
-
-        /* FIXME: This is unnecessary for periodic checkpoint mode */
-        colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
-                     &local_err);
-        if (local_err) {
-            goto out;
-        }
-
-        colo_receive_check_message(mis->from_src_file,
-                           COLO_MESSAGE_VMSTATE_SEND, &local_err);
-        if (local_err) {
-            goto out;
-        }
-
-        qemu_mutex_lock_iothread();
-        cpu_synchronize_all_pre_loadvm();
-        ret = qemu_loadvm_state_main(mis->from_src_file, mis);
-        qemu_mutex_unlock_iothread();
-
-        if (ret < 0) {
-            error_report("Load VM's live state (ram) error");
-            goto out;
-        }
-
-        value = colo_receive_message_value(mis->from_src_file,
-                                 COLO_MESSAGE_VMSTATE_SIZE, &local_err);
-        if (local_err) {
-            goto out;
-        }
-
-        /*
-         * Read VM device state data into channel buffer,
-         * It's better to re-use the memory allocated.
-         * Here we need to handle the channel buffer directly.
-         */
-        if (value > bioc->capacity) {
-            bioc->capacity = value;
-            bioc->data = g_realloc(bioc->data, bioc->capacity);
-        }
-        total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
-        if (total_size != value) {
-            error_report("Got %" PRIu64 " VMState data, less than expected"
-                        " %" PRIu64, total_size, value);
-            goto out;
-        }
-        bioc->usage = total_size;
-        qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
-
-        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
-                     &local_err);
-        if (local_err) {
-            goto out;
-        }
-
-        qemu_mutex_lock_iothread();
-        vmstate_loading = true;
-        ret = qemu_load_device_state(fb);
-        if (ret < 0) {
-            error_report("COLO: load device state failed");
-            qemu_mutex_unlock_iothread();
-            goto out;
-        }
-
-#ifdef CONFIG_REPLICATION
-        replication_get_error_all(&local_err);
-        if (local_err) {
-            qemu_mutex_unlock_iothread();
-            goto out;
-        }
-
-        /* discard colo disk buffer */
-        replication_do_checkpoint_all(&local_err);
-        if (local_err) {
-            qemu_mutex_unlock_iothread();
-            goto out;
-        }
-#else
-        abort();
-#endif
-        /* Notify all filters of all NIC to do checkpoint */
-        colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
-
-        if (local_err) {
-            qemu_mutex_unlock_iothread();
-            goto out;
-        }
-
-        vmstate_loading = false;
-        vm_start();
-        trace_colo_vm_state_change("stop", "run");
-        qemu_mutex_unlock_iothread();
-
-        if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
-            failover_set_state(FAILOVER_STATUS_RELAUNCH,
-                            FAILOVER_STATUS_NONE);
-            failover_request_active(NULL);
-            goto out;
-        }
-
-        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
-                     &local_err);
-        if (local_err) {
-            goto out;
+            break;
         }
     }
 
 out:
     vmstate_loading = false;
-    /* Throw the unreported error message after exited from loop */
-    if (local_err) {
-        error_report_err(local_err);
-    }
 
     /*
      * There are only two reasons we can get here, some error happened
-- 
2.24.1