memory: add memory_region_is_mapped() API

which allows to check if MemoryRegion is already mapped.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 549ae734e6..f4c8d4933e 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -848,6 +848,14 @@ void memory_region_set_alias_offset(MemoryRegion *mr,
 bool memory_region_present(MemoryRegion *container, hwaddr addr);
 
 /**
+ * memory_region_is_mapped: returns true if #MemoryRegion is mapped
+ * into any address space.
+ *
+ * @mr: a #MemoryRegion which should be checked if it's mapped
+ */
+bool memory_region_is_mapped(MemoryRegion *mr);
+
+/**
  * memory_region_find: translate an address/size relative to a
  * MemoryRegion into a #MemoryRegionSection.
  *
diff --git a/memory.c b/memory.c
index 4895e25376..3e8cd5680b 100644
--- a/memory.c
+++ b/memory.c
@@ -493,7 +493,7 @@ static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
             return as;
         }
     }
-    abort();
+    return NULL;
 }
 
 /* Render a memory region into the global view.  Ranges in @view obscure
@@ -1593,6 +1593,11 @@ bool memory_region_present(MemoryRegion *container, hwaddr addr)
     return true;
 }
 
+bool memory_region_is_mapped(MemoryRegion *mr)
+{
+    return mr->container ? true : false;
+}
+
 MemoryRegionSection memory_region_find(MemoryRegion *mr,
                                        hwaddr addr, uint64_t size)
 {
@@ -1610,6 +1615,9 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
     }
 
     as = memory_region_to_address_space(root);
+    if (!as) {
+        return ret;
+    }
     range = addrrange_make(int128_make64(addr), int128_make64(size));
 
     view = address_space_get_flatview(as);