accel/tcg: Disconnect TargetPageDataNode from page size

Dynamically size the node for the runtime target page size.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-29-richard.henderson@linaro.org>

accel/tcg/user-exec.c

@@ -864,7 +864,7 @@ tb_page_addr_t get_page_addr_code_hostp(CPUArchState *env, vaddr addr,
 typedef struct TargetPageDataNode {
     struct rcu_head rcu;
     IntervalTreeNode itree;
-    char data[TPD_PAGES][TARGET_PAGE_DATA_SIZE] __attribute__((aligned));
+    char data[] __attribute__((aligned));
 } TargetPageDataNode;
 
 static IntervalTreeRoot targetdata_root;
@@ -902,15 +902,16 @@ void page_reset_target_data(target_ulong start, target_ulong last)
         n_last = MIN(last, n->last);
         p_len = (n_last + 1 - n_start) >> TARGET_PAGE_BITS;
 
-        memset(t->data[p_ofs], 0, p_len * TARGET_PAGE_DATA_SIZE);
+        memset(t->data + p_ofs * TARGET_PAGE_DATA_SIZE, 0,
+               p_len * TARGET_PAGE_DATA_SIZE);
     }
 }
 
 void *page_get_target_data(target_ulong address)
 {
     IntervalTreeNode *n;
     TargetPageDataNode *t;
-    target_ulong page, region;
+    target_ulong page, region, p_ofs;
 
     page = address & TARGET_PAGE_MASK;
     region = address & TBD_MASK;
@@ -926,7 +927,8 @@ void *page_get_target_data(target_ulong address)
         mmap_lock();
         n = interval_tree_iter_first(&targetdata_root, page, page);
         if (!n) {
-            t = g_new0(TargetPageDataNode, 1);
+            t = g_malloc0(sizeof(TargetPageDataNode)
+                          + TPD_PAGES * TARGET_PAGE_DATA_SIZE);
             n = &t->itree;
             n->start = region;
             n->last = region | ~TBD_MASK;
@@ -936,7 +938,8 @@ void *page_get_target_data(target_ulong address)
     }
 
     t = container_of(n, TargetPageDataNode, itree);
-    return t->data[(page - region) >> TARGET_PAGE_BITS];
+    p_ofs = (page - region) >> TARGET_PAGE_BITS;
+    return t->data + p_ofs * TARGET_PAGE_DATA_SIZE;
 }
 #else
 void page_reset_target_data(target_ulong start, target_ulong last) { }