qmp/migration: new command migrate-recover

The first allow-oob=true command.  It's used on destination side when
the postcopy migration is paused and ready for a recovery.  After
execution, a new migration channel will be established for postcopy to
continue.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-21-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
s/2.12/2.13/

1 files changed, 24 insertions, 0 deletions

diff --git a/migration/migration.c b/migration/migration.c
index c1832b0263..1beb5e07fb 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1475,6 +1475,30 @@ void qmp_migrate_incoming(const char *uri, Error **errp)
     once = false;
 }
 
+void qmp_migrate_recover(const char *uri, Error **errp)
+{
+    MigrationIncomingState *mis = migration_incoming_get_current();
+
+    if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
+        error_setg(errp, "Migrate recover can only be run "
+                   "when postcopy is paused.");
+        return;
+    }
+
+    if (atomic_cmpxchg(&mis->postcopy_recover_triggered,
+                       false, true) == true) {
+        error_setg(errp, "Migrate recovery is triggered already");
+        return;
+    }
+
+    /*
+     * Note that this call will never start a real migration; it will
+     * only re-setup the migration stream and poke existing migration
+     * to continue using that newly established channel.
+     */
+    qemu_start_incoming_migration(uri, errp);
+}
+
 bool migration_is_blocked(Error **errp)
 {
     if (qemu_savevm_state_blocked(errp)) {