memory: Move AddressSpaceDispatch from AddressSpace to FlatView

As we are going to share FlatView's between AddressSpace's,
and AddressSpaceDispatch is a structure to perform quick lookup
in FlatView, this moves ASD to FlatView.

After previosly open coded ASD rendering, we can also remove
as->next_dispatch as the new FlatView pointer is stored
on a stack and set to an AS atomically.

flatview_destroy() is executed under RCU instead of
address_space_dispatch_free() now.

This makes mem_begin/mem_commit to work with ASD and mem_add with FV
as later on mem_add will be taking FV as an argument anyway.

This should cause no behavioural change.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20170921085110.25598-5-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 9abde2f11c..6e08eda256 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -22,16 +22,18 @@
 #ifndef CONFIG_USER_ONLY
 typedef struct AddressSpaceDispatch AddressSpaceDispatch;
 
-void address_space_destroy_dispatch(AddressSpace *as);
-
 extern const MemoryRegionOps unassigned_mem_ops;
 
 bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr,
                                 unsigned size, bool is_write);
 
-void mem_add(AddressSpace *as, MemoryRegionSection *section);
-void mem_begin(AddressSpace *as);
-void mem_commit(AddressSpace *as);
+void mem_add(AddressSpace *as, FlatView *fv, MemoryRegionSection *section);
+AddressSpaceDispatch *mem_begin(AddressSpace *as);
+void mem_commit(AddressSpaceDispatch *d);
+
+AddressSpaceDispatch *address_space_to_dispatch(AddressSpace *as);
+AddressSpaceDispatch *flatview_to_dispatch(FlatView *fv);
+void address_space_dispatch_free(AddressSpaceDispatch *d);
 
 #endif
 #endif