[PATCH 6/9] accel/tcg: Pass last not end to PAGE_FOR_EACH_TB

[Richard Henderson]

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/tb-maint.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index efefa08ee1..745912e60a 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -125,29 +125,29 @@ static void tb_remove(TranslationBlock *tb)
 }
 
 /* TODO: For now, still shared with translate-all.c for system mode. */
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, T, N)    \
-    for (T = foreach_tb_first(start, end),              \
-         N = foreach_tb_next(T, start, end);            \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, T, N)   \
+    for (T = foreach_tb_first(start, last),             \
+         N = foreach_tb_next(T, start, last);           \
          T != NULL;                                     \
-         T = N, N = foreach_tb_next(N, start, end))
+         T = N, N = foreach_tb_next(N, start, last))
 
 typedef TranslationBlock *PageForEachNext;
 
 static PageForEachNext foreach_tb_first(tb_page_addr_t start,
-                                        tb_page_addr_t end)
+                                        tb_page_addr_t last)
 {
-    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, end - 1);
+    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, last);
     return n ? container_of(n, TranslationBlock, itree) : NULL;
 }
 
 static PageForEachNext foreach_tb_next(PageForEachNext tb,
                                        tb_page_addr_t start,
-                                       tb_page_addr_t end)
+                                       tb_page_addr_t last)
 {
     IntervalTreeNode *n;
 
     if (tb) {
-        n = interval_tree_iter_next(&tb->itree, start, end - 1);
+        n = interval_tree_iter_next(&tb->itree, start, last);
         if (n) {
             return container_of(n, TranslationBlock, itree);
         }
@@ -318,7 +318,7 @@ struct page_collection {
 };
 
 typedef int PageForEachNext;
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, tb, n) \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, tb, n) \
     TB_FOR_EACH_TAGGED((pagedesc)->first_tb, tb, n, page_next)
 
 #ifdef CONFIG_DEBUG_TCG
@@ -993,10 +993,11 @@ void tb_invalidate_phys_range(tb_page_addr_t start, 
tb_page_addr_t end)
 {
     TranslationBlock *tb;
     PageForEachNext n;
+    tb_page_addr_t last = end - 1;
 
     assert_memory_lock();
 
-    PAGE_FOR_EACH_TB(start, end, unused, tb, n) {
+    PAGE_FOR_EACH_TB(start, last, unused, tb, n) {
         tb_phys_invalidate__locked(tb);
     }
 }
@@ -1028,6 +1029,7 @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, 
uintptr_t pc)
     bool current_tb_modified;
     TranslationBlock *tb;
     PageForEachNext n;
+    tb_page_addr_t last;
 
     /*
      * Without precise smc semantics, or when outside of a TB,
@@ -1044,10 +1046,11 @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t 
addr, uintptr_t pc)
     assert_memory_lock();
     current_tb = tcg_tb_lookup(pc);
 
+    last = addr | ~TARGET_PAGE_MASK;
     addr &= TARGET_PAGE_MASK;
     current_tb_modified = false;
 
-    PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
+    PAGE_FOR_EACH_TB(addr, last, unused, tb, n) {
         if (current_tb == tb &&
             (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
             /*
@@ -1089,12 +1092,13 @@ tb_invalidate_phys_page_range__locked(struct 
page_collection *pages,
     bool current_tb_modified = false;
     TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
 #endif /* TARGET_HAS_PRECISE_SMC */
+    tb_page_addr_t last G_GNUC_UNUSED = end - 1;
 
     /*
      * We remove all the TBs in the range [start, end[.
      * XXX: see if in some cases it could be faster to invalidate all the code
      */
-    PAGE_FOR_EACH_TB(start, end, p, tb, n) {
+    PAGE_FOR_EACH_TB(start, last, p, tb, n) {
         /* NOTE: this is subtle as a TB may span two physical pages */
         if (n == 0) {
             /* NOTE: tb_end may be after the end of the page, but
-- 
2.34.1