[PATCH v4 07/10] migration: split migration_incoming_co

[Vladimir Sementsov-Ogievskiy]

Originally, migration_incoming_co was introduced by
25d0c16f625feb3b6
   "migration: Switch to COLO process after finishing loadvm"
to be able to enter from COLO code to one specific yield point, added
by 25d0c16f625feb3b6.

Later in 923709896b1b0
 "migration: poll the cm event for destination qemu"
we reused this variable to wake the migration incoming coroutine from
RDMA code.

That was doubtful idea. Entering coroutines is a very fragile thing:
you should be absolutely sure which yield point you are going to enter.

I don't know how much is it safe to enter during qemu_loadvm_state()
which I think what RDMA want to do. But for sure RDMA shouldn't enter
the special COLO-related yield-point. As well, COLO code doesn't want
to enter during qemu_loadvm_state(), it want to enter it's own specific
yield-point.

As well, when in 8e48ac95865ac97d
 "COLO: Add block replication into colo process" we added
bdrv_invalidate_cache_all() call (now it's called activate_all())
it became possible to enter the migration incoming coroutine during
that call which is wrong too.

So, let't make these things separate and disjoint: loadvm_co for RDMA,
non-NULL during qemu_loadvm_state(), and colo_incoming_co for COLO,
non-NULL only around specific yield.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 migration/colo.c      | 4 ++--
 migration/migration.c | 8 ++++++--
 migration/migration.h | 9 ++++++++-
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/migration/colo.c b/migration/colo.c
index 6c7c313956..a688ac553a 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -145,8 +145,8 @@ static void secondary_vm_do_failover(void)
     qemu_sem_post(&mis->colo_incoming_sem);
 
     /* For Secondary VM, jump to incoming co */
-    if (mis->migration_incoming_co) {
-        qemu_coroutine_enter(mis->migration_incoming_co);
+    if (mis->colo_incoming_co) {
+        qemu_coroutine_enter(mis->colo_incoming_co);
     }
 }
 
diff --git a/migration/migration.c b/migration/migration.c
index 8db0892317..23b2d187de 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -505,12 +505,14 @@ process_incoming_migration_co(void *opaque)
     Error *local_err = NULL;
 
     assert(mis->from_src_file);
-    mis->migration_incoming_co = qemu_coroutine_self();
     mis->largest_page_size = qemu_ram_pagesize_largest();
     postcopy_state_set(POSTCOPY_INCOMING_NONE);
     migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
                       MIGRATION_STATUS_ACTIVE);
+
+    mis->loadvm_co = qemu_coroutine_self();
     ret = qemu_loadvm_state(mis->from_src_file);
+    mis->loadvm_co = NULL;
 
     ps = postcopy_state_get();
     trace_process_incoming_migration_co_end(ret, ps);
@@ -551,7 +553,10 @@ process_incoming_migration_co(void *opaque)
 
         qemu_thread_create(&colo_incoming_thread, "COLO incoming",
              colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
+
+        mis->colo_incoming_co = qemu_coroutine_self();
         qemu_coroutine_yield();
+        mis->colo_incoming_co = NULL;
 
         qemu_mutex_unlock_iothread();
         /* Wait checkpoint incoming thread exit before free resource */
@@ -563,7 +568,6 @@ process_incoming_migration_co(void *opaque)
 
     mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
     qemu_bh_schedule(mis->bh);
-    mis->migration_incoming_co = NULL;
     return;
 fail:
     local_err = NULL;
diff --git a/migration/migration.h b/migration/migration.h
index 7721c7658b..48a46123a0 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -162,8 +162,15 @@ struct MigrationIncomingState {
 
     int state;
 
+    /*
+     * The incoming migration coroutine, non-NULL during qemu_loadvm_state().
+     * Used to wake the migration incoming coroutine from rdma code. How much 
is
+     * it safe - it's a question.
+     */
+    Coroutine *loadvm_co;
+
     /* The coroutine we should enter (back) after failover */
-    Coroutine *migration_incoming_co;
+    Coroutine *colo_incoming_co;
     QemuSemaphore colo_incoming_sem;
 
     /*
-- 
2.34.1