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migration: isolate return path on src

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There are some places that binded "return path" with postcopy. Let's be
prepared for its usage even without postcopy. This patch mainly did this
on source side.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2017-05-31 18:35:34 +08:00 committed by Juan Quintela
parent 9bba618f18
commit 0425dc9762
2 changed files with 8 additions and 7 deletions
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11
migration/migration.c
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@ -1857,13 +1857,12 @@ static void migration_completion(MigrationState *s, int current_active_state,
* cleaning everything else up (since if there are no failures
* it will wait for the destination to send it's status in
* a SHUT command).
* Postcopy opens rp if enabled (even if it's not avtivated)
*/
if (migrate_postcopy_ram()) {
if (s->rp_state.from_dst_file) {
int rp_error;
trace_migration_completion_postcopy_end_before_rp();
trace_migration_return_path_end_before();
rp_error = await_return_path_close_on_source(s);
trace_migration_completion_postcopy_end_after_rp(rp_error);
trace_migration_return_path_end_after(rp_error);
if (rp_error) {
goto fail_invalidate;
}
@ -1938,13 +1937,15 @@ static void *migration_thread(void *opaque)
qemu_savevm_state_header(s->to_dst_file);
if (migrate_postcopy_ram()) {
if (s->to_dst_file) {
/* Now tell the dest that it should open its end so it can reply */
qemu_savevm_send_open_return_path(s->to_dst_file);
/* And do a ping that will make stuff easier to debug */
qemu_savevm_send_ping(s->to_dst_file, 1);
}
if (migrate_postcopy_ram()) {
/*
* Tell the destination that we *might* want to do postcopy later;
* if the other end can't do postcopy it should fail now, nice and

4
migration/trace-events
View File

@ -88,8 +88,8 @@ migrate_send_rp_message(int msg_type, uint16_t len) "%d: len %d"
migration_completion_file_err(void) ""
migration_completion_postcopy_end(void) ""
migration_completion_postcopy_end_after_complete(void) ""
migration_completion_postcopy_end_before_rp(void) ""
migration_completion_postcopy_end_after_rp(int rp_error) "%d"
migration_return_path_end_before(void) ""
migration_return_path_end_after(int rp_error) "%d"
migration_thread_after_loop(void) ""
migration_thread_file_err(void) ""
migration_thread_setup_complete(void) ""