memory: add a readonly attribute to MemoryRegionSection

.readonly cannot be obtained from the MemoryRegion, since it is
inherited from aliases (so you can have a MemoryRegion mapped RW
at one address and RO at another).  Record it in a MemoryRegionSection
for listeners.

Signed-off-by: Avi Kivity <avi@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/memory.h b/memory.h
index 84bb67c27a..1d99cee019 100644
--- a/memory.h
+++ b/memory.h
@@ -160,6 +160,7 @@ typedef struct MemoryRegionSection MemoryRegionSection;
  * @size: the size of the section; will not exceed @mr's boundaries
  * @offset_within_address_space: the address of the first byte of the section
  *     relative to the region's address space
+ * @readonly: writes to this section are ignored
  */
 struct MemoryRegionSection {
     MemoryRegion *mr;
@@ -167,6 +168,7 @@ struct MemoryRegionSection {
     target_phys_addr_t offset_within_region;
     uint64_t size;
     target_phys_addr_t offset_within_address_space;
+    bool readonly;
 };
 
 typedef struct MemoryListener MemoryListener;