migration: Stop sending whole pages through main channel

We have to flush() the QEMUFile because now we sent really few data
through that channel.
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

migration/ram.c

@@ -1817,15 +1817,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
 static int ram_save_multifd_page(RAMState *rs, RAMBlock *block,
                                  ram_addr_t offset)
 {
-    uint8_t *p;
-
-    p = block->host + offset;
-
-    ram_counters.transferred += save_page_header(rs, rs->f, block,
-                                                 offset | RAM_SAVE_FLAG_PAGE);
     multifd_queue_page(block, offset);
-    qemu_put_buffer(rs->f, p, TARGET_PAGE_SIZE);
-    ram_counters.transferred += TARGET_PAGE_SIZE;
     ram_counters.normal++;
 
     return 1;
@@ -3066,6 +3058,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
 
     multifd_send_sync_main();
     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
+    qemu_fflush(f);
 
     return 0;
 }
@@ -3148,6 +3141,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
     multifd_send_sync_main();
 out:
     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
+    qemu_fflush(f);
     ram_counters.transferred += 8;
 
     ret = qemu_file_get_error(f);
@@ -3201,6 +3195,7 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
 
     multifd_send_sync_main();
     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
+    qemu_fflush(f);
 
     return 0;
 }