Allow changing the address of a memory region while it is
in the memory hierarchy.
Signed-off-by: Avi Kivity <a...@redhat.com>
---
memory.c | 20 ++++++++++++++++++++
memory.h | 11 +++++++++++
2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/memory.c b/memory.c
index ce0f3fd..3b0cc25 100644
--- a/memory.c
+++ b/memory.c
@@ -1260,6 +1260,26 @@ void memory_region_set_enabled(MemoryRegion *mr, bool
enabled)
memory_region_update_topology(NULL);
}
+void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
+{
+ MemoryRegion *parent = mr->parent;
+ unsigned priority = mr->priority;
+ bool may_overlap = mr->may_overlap;
+
+ if (addr == mr->addr || !parent) {
+ return;
+ }
+
+ memory_region_transaction_begin();
+ memory_region_del_subregion(parent, mr);
+ if (may_overlap) {
+ memory_region_add_subregion_overlap(parent, addr, mr, priority);
+ } else {
+ memory_region_add_subregion(parent, addr, mr);
+ }
+ memory_region_transaction_commit();
+}
+
void set_system_memory_map(MemoryRegion *mr)
{
address_space_memory.root = mr;
diff --git a/memory.h b/memory.h
index 60b1449..468970b 100644
--- a/memory.h
+++ b/memory.h
@@ -509,6 +509,17 @@ void memory_region_del_subregion(MemoryRegion *mr,
*/
void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
+/*
+ * memory_region_set_address: dynamically update the address of a region
+ *
+ * Dynamically updates the address of a region, relative to its parent.
+ * May be used on regions are currently part of a memory hierarchy.
+ *
+ * @mr: the region to be updated
+ * @addr: new address, relative to parent region
+ */
+void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
+
/* Start a transaction; changes will be accumulated and made visible only
* when the transaction ends.
*/
--
1.7.6.3
