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authorzhanghailiang <zhang.zhanghailiang@huawei.com>2016-10-27 14:43:05 +0800
committerAmit Shah <amit@amitshah.net>2016-10-30 15:17:39 +0530
commitb3f7f0c5e6449be7275f1762bccbfa2177395a3b (patch)
treecea5d794796e9ed0383708e1a508022d59738444 /migration/colo.c
parentaef060850bd0e35aa7128e0ae3cef9d62c328314 (diff)
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COLO: Implement the process of failover for primary VM
For primary side, if COLO gets failover request from users. To be exact, gets 'x_colo_lost_heartbeat' command. COLO thread will exit the loop while the failover BH does the cleanup work and resumes VM. Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Amit Shah <amit@amitshah.net>
Diffstat (limited to 'migration/colo.c')
-rw-r--r--migration/colo.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/migration/colo.c b/migration/colo.c
index 6b32c91..04f7c55 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -41,6 +41,40 @@ bool migration_incoming_in_colo_state(void)
return mis && (mis->state == MIGRATION_STATUS_COLO);
}
+static bool colo_runstate_is_stopped(void)
+{
+ return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
+}
+
+static void primary_vm_do_failover(void)
+{
+ MigrationState *s = migrate_get_current();
+ int old_state;
+
+ migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
+ MIGRATION_STATUS_COMPLETED);
+
+ old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
+ FAILOVER_STATUS_COMPLETED);
+ if (old_state != FAILOVER_STATUS_ACTIVE) {
+ error_report("Incorrect state (%s) while doing failover for Primary VM",
+ FailoverStatus_lookup[old_state]);
+ return;
+ }
+}
+
+void colo_do_failover(MigrationState *s)
+{
+ /* Make sure VM stopped while failover happened. */
+ if (!colo_runstate_is_stopped()) {
+ vm_stop_force_state(RUN_STATE_COLO);
+ }
+
+ if (get_colo_mode() == COLO_MODE_PRIMARY) {
+ primary_vm_do_failover();
+ }
+}
+
static void colo_send_message(QEMUFile *f, COLOMessage msg,
Error **errp)
{
@@ -162,9 +196,20 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
bioc->usage = 0;
qemu_mutex_lock_iothread();
+ if (failover_get_state() != FAILOVER_STATUS_NONE) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
vm_stop_force_state(RUN_STATE_COLO);
qemu_mutex_unlock_iothread();
trace_colo_vm_state_change("run", "stop");
+ /*
+ * Failover request bh could be called after vm_stop_force_state(),
+ * So we need check failover_request_is_active() again.
+ */
+ if (failover_get_state() != FAILOVER_STATUS_NONE) {
+ goto out;
+ }
/* Disable block migration */
s->params.blk = 0;
@@ -259,6 +304,11 @@ static void colo_process_checkpoint(MigrationState *s)
trace_colo_vm_state_change("stop", "run");
while (s->state == MIGRATION_STATUS_COLO) {
+ if (failover_get_state() != FAILOVER_STATUS_NONE) {
+ error_report("failover request");
+ goto out;
+ }
+
current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
if (current_time - checkpoint_time <
s->parameters.x_checkpoint_delay) {