[PATCH-for-6.1 v3 2/5] memory: Add memory_region_set_priority()

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Add an helper to change the priority of a memory region at runtime.

Suggested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/exec/memory.h | 10 ++++++++++
 softmmu/memory.c      | 11 +++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 5728a681b27..6ad9ff83457 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1983,6 +1983,16 @@ void memory_region_set_size(MemoryRegion *mr, uint64_t size);
 void memory_region_set_alias_offset(MemoryRegion *mr,
                                     hwaddr offset);
 
+/**
+ * memory_region_set_priority: dynamically update the priority of a region.
+ *
+ * Dynamically updates the priority of a region.
+ *
+ * @mr: the #MemoryRegion to be updated.
+ * @priority: priority of the region.
+ */
+void memory_region_set_priority(MemoryRegion *mr, int priority);
+
 /**
  * memory_region_present: checks if an address relative to a @container
  * translates into #MemoryRegion within @container
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 4fbeee02dc7..fdba938f299 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -2504,6 +2504,17 @@ void memory_region_set_size(MemoryRegion *mr, uint64_t size)
     memory_region_transaction_commit();
 }
 
+void memory_region_set_priority(MemoryRegion *mr, int priority)
+{
+    if (priority == mr->priority) {
+        return;
+    }
+    memory_region_transaction_begin();
+    mr->priority = priority;
+    memory_region_update_pending = true;
+    memory_region_transaction_commit();
+}
+
 static void memory_region_readd_subregion(MemoryRegion *mr)
 {
     MemoryRegion *container = mr->container;
-- 
2.26.2