Introduce address_space_is_ram(), a helper to determine whether
a guest physical address resolves to a RAM-backed MemoryRegion within
an AddressSpace.

Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
---
 include/system/memory.h | 10 ++++++++++
 system/physmem.c        | 11 +++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/system/memory.h b/include/system/memory.h
index 0562af3136..02b2e83fd7 100644
--- a/include/system/memory.h
+++ b/include/system/memory.h
@@ -2900,6 +2900,16 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, hwaddr len,
  */
 bool address_space_is_io(AddressSpace *as, hwaddr addr);
 
+/**
+ * address_space_is_ram: check whether a guest physical address whithin
+ *                       an address space is RAM.
+ *
+ * @as: #AddressSpace to be accessed
+ * @addr: address within that address space
+ */
+
+bool address_space_is_ram(AddressSpace *as, hwaddr addr);
+
 /* address_space_map: map a physical memory region into a host virtual address
  *
  * May map a subset of the requested range, given by and returned in @plen.
diff --git a/system/physmem.c b/system/physmem.c
index 2fb0c25c93..ddcf921311 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -3646,6 +3646,17 @@ bool address_space_is_io(AddressSpace *as, hwaddr addr)
     return !(memory_region_is_ram(mr) || memory_region_is_romd(mr));
 }
 
+bool address_space_is_ram(AddressSpace *as, hwaddr addr)
+{
+    MemoryRegion *mr;
+
+    RCU_READ_LOCK_GUARD();
+    mr = address_space_translate(as, addr, &addr, NULL, false,
+                                 MEMTXATTRS_UNSPECIFIED);
+
+    return memory_region_is_ram(mr);
+}
+
 static hwaddr
 flatview_extend_translation(FlatView *fv, hwaddr addr,
                             hwaddr target_len,
-- 
2.43.0