[PATCH v7 05/12] migration: Make ram_save_target_page() a pointer

[Juan Quintela]

We are going to create a new function for multifd latest in the series.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 85d89d61ac..499d9b2a90 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -310,6 +310,9 @@ typedef struct {
     bool preempted;
 } PostcopyPreemptState;
 
+typedef struct RAMState RAMState;
+typedef struct PageSearchStatus PageSearchStatus;
+
 /* State of RAM for migration */
 struct RAMState {
     /* QEMUFile used for this migration */
@@ -372,8 +375,9 @@ struct RAMState {
      * is enabled.
      */
     unsigned int postcopy_channel;
+
+    int (*ram_save_target_page)(RAMState *rs, PageSearchStatus *pss);
 };
-typedef struct RAMState RAMState;
 
 static RAMState *ram_state;
 
@@ -2255,14 +2259,14 @@ static bool save_compress_page(RAMState *rs, RAMBlock 
*block, ram_addr_t offset)
 }
 
 /**
- * ram_save_target_page: save one target page
+ * ram_save_target_page_legacy: save one target page
  *
  * Returns the number of pages written
  *
  * @rs: current RAM state
  * @pss: data about the page we want to send
  */
-static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss)
+static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss)
 {
     RAMBlock *block = pss->block;
     ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
@@ -2469,7 +2473,7 @@ static int ram_save_host_page(RAMState *rs, 
PageSearchStatus *pss)
 
         /* Check the pages is dirty and if it is send it */
         if (migration_bitmap_clear_dirty(rs, pss->block, pss->page)) {
-            tmppages = ram_save_target_page(rs, pss);
+            tmppages = rs->ram_save_target_page(rs, pss);
             if (tmppages < 0) {
                 return tmppages;
             }
@@ -3223,6 +3227,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
     ram_control_before_iterate(f, RAM_CONTROL_SETUP);
     ram_control_after_iterate(f, RAM_CONTROL_SETUP);
 
+    (*rsp)->ram_save_target_page = ram_save_target_page_legacy;
     ret =  multifd_send_sync_main(f);
     if (ret < 0) {
         return ret;
-- 
2.37.1