memory: make cpu_physical_memory_is_dirty return bool

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

exec.c

diff --git a/exec.c b/exec.c
index ea78d82..a8c79e5 100644
--- a/exec.c
+++ b/exec.c
@@ -1485,11 +1485,8 @@
 static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
                                uint64_t val, unsigned size)
 {
-    int dirty_flags;
-    dirty_flags = cpu_physical_memory_get_dirty_flags(ram_addr);
     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);
     }
     switch (size) {
     case 1:
@@ -1504,8 +1501,8 @@
     default:
         abort();
     }
-    dirty_flags |= (0xff & ~CODE_DIRTY_FLAG);
-    cpu_physical_memory_set_dirty_flags(ram_addr, dirty_flags);
+    cpu_physical_memory_set_dirty_flag(ram_addr, MIGRATION_DIRTY_FLAG);
+    cpu_physical_memory_set_dirty_flag(ram_addr, VGA_DIRTY_FLAG);
     /* we remove the notdirty callback only if the code has been
        flushed */
     if (cpu_physical_memory_is_dirty(ram_addr)) {

include/exec/memory-internal.h

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 136198c..0b25c3f 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -56,9 +56,13 @@
 }
 
 /* read dirty bit (return 0 or 1) */
-static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
+static inline bool cpu_physical_memory_is_dirty(ram_addr_t addr)
 {
-    return cpu_physical_memory_get_dirty_flags(addr) == 0xff;
+    bool vga = cpu_physical_memory_get_dirty_flag(addr, VGA_DIRTY_FLAG);
+    bool code = cpu_physical_memory_get_dirty_flag(addr, CODE_DIRTY_FLAG);
+    bool migration =
+        cpu_physical_memory_get_dirty_flag(addr, MIGRATION_DIRTY_FLAG);
+    return vga && code && migration;
 }
 
 static inline int cpu_physical_memory_get_dirty(ram_addr_t start,