[Qemu-devel] [PATCH v6 45/47] End of migration for postcopy

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Tweak the end of migration cleanup; we don't want to close stuff down
at the end of the main stream, since the postcopy is still sending pages
on the other thread.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/migration.c | 25 ++++++++++++++++++++++++-
 trace-events          |  2 ++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/migration/migration.c b/migration/migration.c
index 6537d23..180c8b0 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -160,12 +160,35 @@ static void process_incoming_migration_co(void *opaque)
 {
     QEMUFile *f = opaque;
     Error *local_err = NULL;
+    MigrationIncomingState *mis;
+    PostcopyState ps;
     int ret;
 
-    migration_incoming_state_new(f);
+    mis = migration_incoming_state_new(f);
 
     ret = qemu_loadvm_state(f);
 
+    ps = postcopy_state_get(mis);
+    trace_process_incoming_migration_co_end(ret, ps);
+    if (ps != POSTCOPY_INCOMING_NONE) {
+        if (ps == POSTCOPY_INCOMING_ADVISE) {
+            /*
+             * Where a migration had postcopy enabled (and thus went to advise)
+             * but managed to complete within the precopy period, we can use
+             * the normal exit.
+             */
+            postcopy_ram_incoming_cleanup(mis);
+        } else if (ret >= 0) {
+            /*
+             * Postcopy was started, cleanup should happen at the end of the
+             * postcopy thread.
+             */
+            trace_process_incoming_migration_co_postcopy_end_main();
+            return;
+        }
+        /* Else if something went wrong then just fall out of the normal exit */
+    }
+
     qemu_fclose(f);
     free_xbzrle_decoded_buf();
     migration_incoming_state_destroy();
diff --git a/trace-events b/trace-events
index 1ab9079..1378992 100644
--- a/trace-events
+++ b/trace-events
@@ -1435,6 +1435,8 @@ source_return_path_thread_loop_top(void) ""
 source_return_path_thread_pong(uint32_t val) "%x"
 source_return_path_thread_shut(uint32_t val) "%x"
 migrate_transferred(uint64_t tranferred, uint64_t time_spent, double bandwidth, uint64_t size) "transferred %" PRIu64 " time_spent %" PRIu64 " bandwidth %g max_size %" PRId64
+process_incoming_migration_co_end(int ret, int ps) "ret=%d postcopy-state=%d"
+process_incoming_migration_co_postcopy_end_main(void) ""
 
 # migration/rdma.c
 qemu_dma_accept_incoming_migration(void) ""
-- 
2.1.0