exec: create function to get a single dirty bit

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>

2 files changed, 7 insertions, 1 deletions

diff --git a/exec.c b/exec.c
index c42a2f9794..ea78d82023 100644
--- a/exec.c
+++ b/exec.c
@@ -1487,7 +1487,7 @@ static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
 {
     int dirty_flags;
     dirty_flags = cpu_physical_memory_get_dirty_flags(ram_addr);
-    if (!(dirty_flags & CODE_DIRTY_FLAG)) {
+    if (!cpu_physical_memory_get_dirty_flag(ram_addr, CODE_DIRTY_FLAG)) {
         tb_invalidate_phys_page_fast(ram_addr, size);
         dirty_flags = cpu_physical_memory_get_dirty_flags(ram_addr);
     }
diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 4ebab8066a..136198c001 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -49,6 +49,12 @@ static inline int cpu_physical_memory_get_dirty_flags(ram_addr_t addr)
     return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS];
 }
 
+static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
+                                                      int dirty_flag)
+{
+    return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] & dirty_flag;
+}
+
 /* read dirty bit (return 0 or 1) */
 static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
 {