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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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6
include/exec/cpu-all.h
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@ -175,7 +175,7 @@ extern unsigned long reserved_va;
#define TARGET_ENDIANNESS
#include "exec/memory_ldst.inc.h"
#define SUFFIX _cached
#define SUFFIX _cached_slow
#define ARG1 cache
#define ARG1_DECL MemoryRegionCache *cache
#define TARGET_ENDIANNESS
@ -193,6 +193,10 @@ static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val
#define TARGET_ENDIANNESS
#include "exec/memory_ldst_phys.inc.h"
/* Inline fast path for direct RAM access. */
#define ENDIANNESS
#include "exec/memory_ldst_cached.inc.h"
#define SUFFIX _cached
#define ARG1 cache
#define ARG1_DECL MemoryRegionCache *cache