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-rw-r--r--memory.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/memory.c b/memory.c
index c374317ba2..15724db7d6 100644
--- a/memory.c
+++ b/memory.c
@@ -230,6 +230,7 @@ struct FlatView {
unsigned nr;
unsigned nr_allocated;
struct AddressSpaceDispatch *dispatch;
+ MemoryRegion *root;
};
typedef struct AddressSpaceOps AddressSpaceOps;
@@ -259,12 +260,14 @@ static bool flatrange_equal(FlatRange *a, FlatRange *b)
&& a->readonly == b->readonly;
}
-static FlatView *flatview_new(void)
+static FlatView *flatview_new(MemoryRegion *mr_root)
{
FlatView *view;
view = g_new0(FlatView, 1);
view->ref = 1;
+ view->root = mr_root;
+ memory_region_ref(mr_root);
return view;
}
@@ -297,6 +300,7 @@ static void flatview_destroy(FlatView *view)
memory_region_unref(view->ranges[i].mr);
}
g_free(view->ranges);
+ memory_region_unref(view->root);
g_free(view);
}
@@ -723,12 +727,25 @@ static void render_memory_region(FlatView *view,
}
}
+static MemoryRegion *memory_region_get_flatview_root(MemoryRegion *mr)
+{
+ while (mr->alias && !mr->alias_offset &&
+ int128_ge(mr->size, mr->alias->size)) {
+ /* The alias is included in its entirety. Use it as
+ * the "real" root, so that we can share more FlatViews.
+ */
+ mr = mr->alias;
+ }
+
+ return mr;
+}
+
/* Render a memory topology into a list of disjoint absolute ranges. */
static FlatView *generate_memory_topology(MemoryRegion *mr)
{
FlatView *view;
- view = flatview_new();
+ view = flatview_new(mr);
if (mr) {
render_memory_region(view, mr, int128_zero(),
@@ -907,7 +924,8 @@ static void address_space_update_topology_pass(AddressSpace *as,
static void address_space_update_topology(AddressSpace *as)
{
FlatView *old_view = address_space_get_flatview(as);
- FlatView *new_view = generate_memory_topology(as->root);
+ MemoryRegion *physmr = memory_region_get_flatview_root(old_view->root);
+ FlatView *new_view = generate_memory_topology(physmr);
int i;
new_view->dispatch = address_space_dispatch_new(new_view);
@@ -2650,7 +2668,7 @@ void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
as->ref_count = 1;
as->root = root;
as->malloced = false;
- as->current_map = flatview_new();
+ as->current_map = flatview_new(root);
as->ioeventfd_nb = 0;
as->ioeventfds = NULL;
QTAILQ_INIT(&as->listeners);