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exec: reintroduce MemoryRegion caching

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MemoryRegionCache was reverted to "normal" address_space_* operations
for 2.9, due to lack of support for IOMMUs.  Reinstate the
optimizations, caching only the IOMMU translation at address_cache_init
but not the IOMMU lookup and target AddressSpace translation are not
cached; now that MemoryRegionCache supports IOMMUs, it becomes more widely
applicable too.

The inlined fast path is defined in memory_ldst_cached.inc.h, while the
slow path uses memory_ldst.inc.c as before.  The smaller fast path causes
a little code size reduction in MemoryRegionCache users:

    hw/virtio/virtio.o text size before: 32373
    hw/virtio/virtio.o text size after: 31941

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-18 18:26:36 +01:00
parent a411c84b56
commit 48564041a7
6 changed files with 280 additions and 20 deletions
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3
include/exec/memory-internal.h
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@ -31,6 +31,9 @@ static inline AddressSpaceDispatch *address_space_to_dispatch(AddressSpace *as)
return flatview_to_dispatch(address_space_to_flatview(as));
}
FlatView *address_space_get_flatview(AddressSpace *as);
void flatview_unref(FlatView *view);
extern const MemoryRegionOps unassigned_mem_ops;
bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr,