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[Qemu-devel] [PATCH COLO-Frame v18 19/34] COLO: Implement failover work
From: |
zhanghailiang |
Subject: |
[Qemu-devel] [PATCH COLO-Frame v18 19/34] COLO: Implement failover work for Secondary VM |
Date: |
Wed, 3 Aug 2016 20:25:57 +0800 |
If users require SVM to takeover work, colo incoming thread should
exit from loop while failover BH helps backing to migration incoming
coroutine.
Signed-off-by: zhanghailiang <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
---
v12:
- Improve error message that suggested by Dave
- Add Reviewed-by tag
---
migration/colo.c | 42 +++++++++++++++++++++++++++++++++++++++---
1 file changed, 39 insertions(+), 3 deletions(-)
diff --git a/migration/colo.c b/migration/colo.c
index a4fe334..eeef775 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -46,6 +46,33 @@ static bool colo_runstate_is_stopped(void)
return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
}
+static void secondary_vm_do_failover(void)
+{
+ int old_state;
+ MigrationIncomingState *mis = migration_incoming_get_current();
+
+ migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
+ MIGRATION_STATUS_COMPLETED);
+
+ if (!autostart) {
+ error_report("\"-S\" qemu option will be ignored in secondary side");
+ /* recover runstate to normal migration finish state */
+ autostart = true;
+ }
+
+ old_state = failover_set_state(FAILOVER_STATUS_HANDLING,
+ FAILOVER_STATUS_COMPLETED);
+ if (old_state != FAILOVER_STATUS_HANDLING) {
+ error_report("Incorrect state (%d) while doing failover for "
+ "secondary VM", old_state);
+ return;
+ }
+ /* For Secondary VM, jump to incoming co */
+ if (mis->migration_incoming_co) {
+ qemu_coroutine_enter(mis->migration_incoming_co);
+ }
+}
+
static void primary_vm_do_failover(void)
{
MigrationState *s = migrate_get_current();
@@ -72,6 +99,8 @@ void colo_do_failover(MigrationState *s)
if (get_colo_mode() == COLO_MODE_PRIMARY) {
primary_vm_do_failover();
+ } else {
+ secondary_vm_do_failover();
}
}
@@ -421,6 +450,11 @@ void *colo_process_incoming_thread(void *opaque)
goto out;
}
assert(request);
+ if (failover_request_is_active()) {
+ error_report("failover request");
+ goto out;
+ }
+
/* FIXME: This is unnecessary for periodic checkpoint mode */
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
&local_err);
@@ -490,10 +524,12 @@ out:
if (fb) {
qemu_fclose(fb);
}
-
- qemu_mutex_lock_iothread();
+ /*
+ * We can ensure BH is hold the global lock, and will join COLO
+ * incoming thread, so here it is not necessary to lock here again,
+ * Or there will be a deadlock error.
+ */
colo_release_ram_cache();
- qemu_mutex_unlock_iothread();
if (mis->to_src_file) {
qemu_fclose(mis->to_src_file);
--
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 <=
- [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, 2016/08/03
- [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