migration: Remove save_page_use_compression()

After previous patch, we disable the posiblity that we use compression
together with xbzrle.  So we can use directly migrate_compress().

Once there, now we don't need the rs parameter, so remove it.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231019110724.15324-4-quintela@redhat.com>

migration/ram.c

@@ -1291,8 +1291,6 @@ static int ram_save_multifd_page(QEMUFile *file, RAMBlock *block,
     return 1;
 }
 
-static bool save_page_use_compression(RAMState *rs);
-
 static int send_queued_data(CompressParam *param)
 {
     PageSearchStatus *pss = &ram_state->pss[RAM_CHANNEL_PRECOPY];
@@ -1329,9 +1327,9 @@ static int send_queued_data(CompressParam *param)
     return len;
 }
 
-static void ram_flush_compressed_data(RAMState *rs)
+static void ram_flush_compressed_data(void)
 {
-    if (!save_page_use_compression(rs)) {
+    if (!migrate_compress()) {
         return;
     }
 
@@ -1393,7 +1391,7 @@ static int find_dirty_block(RAMState *rs, PageSearchStatus *pss)
              * Also If xbzrle is on, stop using the data compression at this
              * point. In theory, xbzrle can do better than compression.
              */
-            ram_flush_compressed_data(rs);
+            ram_flush_compressed_data();
 
             /* Hit the end of the list */
             pss->block = QLIST_FIRST_RCU(&ram_list.blocks);
@@ -2042,24 +2040,6 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
     return 0;
 }
 
-static bool save_page_use_compression(RAMState *rs)
-{
-    if (!migrate_compress()) {
-        return false;
-    }
-
-    /*
-     * If xbzrle is enabled (e.g., after first round of migration), stop
-     * using the data compression. In theory, xbzrle can do better than
-     * compression.
-     */
-    if (rs->xbzrle_started) {
-        return false;
-    }
-
-    return true;
-}
-
 /*
  * try to compress the page before posting it out, return true if the page
  * has been properly handled by compression, otherwise needs other
@@ -2068,7 +2048,7 @@ static bool save_page_use_compression(RAMState *rs)
 static bool save_compress_page(RAMState *rs, PageSearchStatus *pss,
                                ram_addr_t offset)
 {
-    if (!save_page_use_compression(rs)) {
+    if (!migrate_compress()) {
         return false;
     }
 
@@ -2083,7 +2063,7 @@ static bool save_compress_page(RAMState *rs, PageSearchStatus *pss,
      * much CPU resource.
      */
     if (pss->block != pss->last_sent_block) {
-        ram_flush_compressed_data(rs);
+        ram_flush_compressed_data();
         return false;
     }
 
@@ -3135,7 +3115,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
              * page is sent in one chunk.
              */
             if (migrate_postcopy_ram()) {
-                ram_flush_compressed_data(rs);
+                ram_flush_compressed_data();
             }
 
             /*
@@ -3236,7 +3216,7 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
         }
         qemu_mutex_unlock(&rs->bitmap_mutex);
 
-        ram_flush_compressed_data(rs);
+        ram_flush_compressed_data();
 
         int ret = rdma_registration_stop(f, RAM_CONTROL_FINISH);
         if (ret < 0) {