memory: implement memory_region_set_readonly()

The property is inheritable, but only if set to true.  This is so
that memory routers can mark sections of RAM as read-only via aliases.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/memory.h b/memory.h
index 06b83ae76b..e93e65a4f2 100644
--- a/memory.h
+++ b/memory.h
@@ -114,6 +114,7 @@ struct MemoryRegion {
     IORange iorange;
     bool terminates;
     bool readable;
+    bool readonly; /* For RAM regions */
     MemoryRegion *alias;
     target_phys_addr_t alias_offset;
     unsigned priority;