We should not do failover work while the main thread is loading
VM's state, otherwise it will destroy the consistent of VM's memory and
device state.
Here we add a new failover status 'RELAUNCH' which means we should
relaunch the process of failover.
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Signed-off-by: Li Zhijian <lizhij...@cn.fujitsu.com>
Signed-off-by: Lai Jiangshan <la...@cn.fujitsu.com>
---
include/migration/failover.h | 2 ++
migration/colo.c | 22 ++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/migration/failover.h b/include/migration/failover.h
index f85f97d..3f65f5d 100644
--- a/include/migration/failover.h
+++ b/include/migration/failover.h
@@ -20,6 +20,8 @@ typedef enum COLOFailoverStatus {
FAILOVER_STATUS_REQUEST = 1, /* Request but not handled */
FAILOVER_STATUS_HANDLING = 2, /* In the process of handling failover */
FAILOVER_STATUS_COMPLETED = 3, /* Finish the failover process */
+ /* Optional, Relaunch the failover process, again 'NONE' -> 'COMPLETED' */
+ FAILOVER_STATUS_RELAUNCH = 4,
} COLOFailoverStatus;
int failover_set_state(int old_state, int new_state);
diff --git a/migration/colo.c b/migration/colo.c
index 70fcf25..aab7b38 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -53,6 +53,7 @@ enum {
};
static QEMUBH *colo_bh;
+static bool vmstate_loading;
static Coroutine *colo;
/* colo buffer */
#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
@@ -90,6 +91,18 @@ static bool colo_runstate_is_stopped(void)
static void secondary_vm_do_failover(void)
{
int old_state;
+ /* Can not do failover during the process of VM's loading VMstate, Or
+ * it will break the secondary VM.
+ */
+ if (vmstate_loading) {
+ old_state = failover_set_state(FAILOVER_STATUS_HANDLING,
+ FAILOVER_STATUS_RELAUNCH);
+ if (old_state != FAILOVER_STATUS_HANDLING) {
+ error_report("Unknow error while do failover for secondary VM,"
+ "old_state: %d", old_state);
+ return;
+ }
+ }
/* It means that VM exit from COLO state */
colo = NULL;
@@ -528,13 +541,22 @@ void *colo_process_incoming_checkpoints(void *opaque)
qemu_mutex_lock_iothread();
qemu_system_reset(VMRESET_SILENT);
+ vmstate_loading = true;
if (qemu_loadvm_state(fb) < 0) {
error_report("COLO: loadvm failed");
+ vmstate_loading = false;
qemu_mutex_unlock_iothread();
goto out;
}
+
+ vmstate_loading = false;
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;
+ }
ret = colo_ctl_put(ctl, COLO_CHECKPOINT_LOADED);
if (ret < 0) {
goto out;
--
1.7.12.4
