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[Qemu-devel] [PATCH COLO-Frame v18 22/34] COLO failover: Don't do failov
From: |
zhanghailiang |
Subject: |
[Qemu-devel] [PATCH COLO-Frame v18 22/34] COLO failover: Don't do failover during loading VM's state |
Date: |
Wed, 3 Aug 2016 20:26:00 +0800 |
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 <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
---
v14:
- Move the place of 'vmstate_loading = false;'.
v13:
- Add Reviewed-by tag
---
include/migration/failover.h | 2 ++
migration/colo.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/migration/failover.h b/include/migration/failover.h
index c4bd81e..99b0d58 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;
void failover_init_state(void);
diff --git a/migration/colo.c b/migration/colo.c
index af1cf8e..7bddb1f 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -21,6 +21,8 @@
#include "migration/failover.h"
#include "qapi-event.h"
+static bool vmstate_loading;
+
#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
bool colo_supported(void)
@@ -52,6 +54,19 @@ static void secondary_vm_do_failover(void)
int old_state;
MigrationIncomingState *mis = migration_incoming_get_current();
+ /* 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("Unknown error while do failover for secondary VM,"
+ "old_state: %d", old_state);
+ }
+ return;
+ }
+
migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
MIGRATION_STATUS_COMPLETED);
@@ -552,13 +567,22 @@ void *colo_process_incoming_thread(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");
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;
+ }
+
colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
&local_err);
if (local_err) {
@@ -567,6 +591,7 @@ void *colo_process_incoming_thread(void *opaque)
}
out:
+ vmstate_loading = false;
/* Throw the unreported error message after exited from loop */
if (local_err) {
error_report_err(local_err);
--
1.8.3.1
- [Qemu-devel] [PATCH COLO-Frame v18 00/34] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service (FT), zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 08/34] COLO: Add a new RunState RUN_STATE_COLO, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 01/34] configure: Add parameter for configure to enable/disable COLO support, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 07/34] COLO: Implement COLO checkpoint protocol, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 19/34] COLO: Implement failover work for Secondary VM, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 13/34] COLO: Flush PVM's cached RAM into SVM's memory, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 22/34] COLO failover: Don't do failover during loading VM's state,
zhanghailiang <=
- [Qemu-devel] [PATCH COLO-Frame v18 14/34] COLO: Add checkpoint-delay parameter for migrate-set-parameters, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 26/34] migration/savevm: Add new helpers to process the different stages of loadvm, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 21/34] COLO failover: Shutdown related socket fd when do failover, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 18/34] COLO: Implement failover work for Primary VM, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 12/34] COLO: Load VMState into buffer before restore it, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 28/34] COLO: Separate the process of saving/loading ram and device state, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 10/34] COLO: Load PVM's dirty pages into SVM's RAM cache temporarily, zhanghailiang, 2016/08/03
- [Qemu-devel] [PATCH COLO-Frame v18 24/34] COLO: Update the global runstate after going into colo state, zhanghailiang, 2016/08/03