migration/rdma: Remove all uses of RAM_CONTROL_HOOK

Instead of going trhough ram_control_load_hook(), call
qemu_rdma_registration_handle() directly.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230509120700.78359-5-quintela@redhat.com>

migration/qemu-file.h

@@ -41,7 +41,6 @@ typedef int (QEMURamHookFunc)(QEMUFile *f, uint64_t flags, void *data);
  */
 #define RAM_CONTROL_SETUP     0
 #define RAM_CONTROL_ROUND     1
-#define RAM_CONTROL_HOOK      2
 #define RAM_CONTROL_FINISH    3
 #define RAM_CONTROL_BLOCK_REG 4
 

migration/ram.c

@@ -4024,7 +4024,10 @@ static int ram_load_precopy(QEMUFile *f)
             }
             break;
         case RAM_SAVE_FLAG_HOOK:
-            ram_control_load_hook(f, RAM_CONTROL_HOOK, NULL);
+            ret = qemu_rdma_registration_handle(f);
+            if (ret < 0) {
+                qemu_file_set_error(f, ret);
+            }
             break;
         default:
             error_report("Unknown combination of migration flags: 0x%x", flags);

migration/rdma.c

@@ -3530,7 +3530,7 @@ static int dest_ram_sort_func(const void *a, const void *b)
  *
  * Keep doing this until the source tells us to stop.
  */
-static int qemu_rdma_registration_handle(QEMUFile *f)
+int qemu_rdma_registration_handle(QEMUFile *f)
 {
     RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult),
                                .type = RDMA_CONTROL_REGISTER_RESULT,
@@ -3557,6 +3557,10 @@ static int qemu_rdma_registration_handle(QEMUFile *f)
     int count = 0;
     int i = 0;
 
+    if (!migrate_rdma()) {
+        return 0;
+    }
+
     RCU_READ_LOCK_GUARD();
     rdma = qatomic_rcu_read(&rioc->rdmain);
 
@@ -3854,9 +3858,6 @@ static int rdma_load_hook(QEMUFile *f, uint64_t flags, void *data)
     case RAM_CONTROL_BLOCK_REG:
         return rdma_block_notification_handle(f, data);
 
-    case RAM_CONTROL_HOOK:
-        return qemu_rdma_registration_handle(f);
-
     default:
         /* Shouldn't be called with any other values */
         abort();

migration/rdma.h

@@ -24,9 +24,11 @@ void rdma_start_incoming_migration(const char *host_port, Error **errp);
 
 
 #ifdef CONFIG_RDMA
+int qemu_rdma_registration_handle(QEMUFile *f);
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags);
 int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags);
 #else
+int qemu_rdma_registration_handle(QEMUFile *f) { return 0; }
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags) { return 0; }
 int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags) { return 0; }
 #endif