48564041a7
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>
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*
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* Declarations for functions which are internal to the memory subsystem.
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*
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* Copyright 2011 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Avi Kivity <avi@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*
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*/
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/*
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* This header is for use by exec.c, memory.c and accel/tcg/cputlb.c ONLY,
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* for declarations which are shared between the memory subsystem's
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* internals and the TCG TLB code. Do not include it from elsewhere.
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*/
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#ifndef MEMORY_INTERNAL_H
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#define MEMORY_INTERNAL_H
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#ifndef CONFIG_USER_ONLY
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static inline AddressSpaceDispatch *flatview_to_dispatch(FlatView *fv)
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{
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return fv->dispatch;
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}
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static inline AddressSpaceDispatch *address_space_to_dispatch(AddressSpace *as)
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{
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return flatview_to_dispatch(address_space_to_flatview(as));
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}
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FlatView *address_space_get_flatview(AddressSpace *as);
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void flatview_unref(FlatView *view);
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extern const MemoryRegionOps unassigned_mem_ops;
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bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr,
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unsigned size, bool is_write);
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void flatview_add_to_dispatch(FlatView *fv, MemoryRegionSection *section);
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AddressSpaceDispatch *address_space_dispatch_new(FlatView *fv);
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void address_space_dispatch_compact(AddressSpaceDispatch *d);
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void address_space_dispatch_free(AddressSpaceDispatch *d);
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void mtree_print_dispatch(fprintf_function mon, void *f,
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struct AddressSpaceDispatch *d,
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MemoryRegion *root);
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/* Opaque struct for passing info from memory_notdirty_write_prepare()
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* to memory_notdirty_write_complete(). Callers should treat all fields
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* as private, with the exception of @active.
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*
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* @active is a field which is not touched by either the prepare or
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* complete functions, but which the caller can use if it wishes to
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* track whether it has called prepare for this struct and so needs
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* to later call the complete function.
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*/
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typedef struct {
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CPUState *cpu;
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ram_addr_t ram_addr;
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vaddr mem_vaddr;
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unsigned size;
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bool locked;
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bool active;
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} NotDirtyInfo;
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/**
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* memory_notdirty_write_prepare: call before writing to non-dirty memory
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* @ndi: pointer to opaque NotDirtyInfo struct
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* @cpu: CPU doing the write
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* @mem_vaddr: virtual address of write
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* @ram_addr: the ram address of the write
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* @size: size of write in bytes
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*
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* Any code which writes to the host memory corresponding to
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* guest RAM which has been marked as NOTDIRTY must wrap those
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* writes in calls to memory_notdirty_write_prepare() and
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* memory_notdirty_write_complete():
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*
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* NotDirtyInfo ndi;
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* memory_notdirty_write_prepare(&ndi, ....);
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* ... perform write here ...
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* memory_notdirty_write_complete(&ndi);
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*
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* These calls will ensure that we flush any TCG translated code for
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* the memory being written, update the dirty bits and (if possible)
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* remove the slowpath callback for writing to the memory.
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*
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* This must only be called if we are using TCG; it will assert otherwise.
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*
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* We may take a lock in the prepare call, so callers must ensure that
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* they don't exit (via longjump or otherwise) without calling complete.
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*
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* This call must only be made inside an RCU critical section.
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* (Note that while we're executing a TCG TB we're always in an
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* RCU critical section, which is likely to be the case for callers
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* of these functions.)
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*/
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void memory_notdirty_write_prepare(NotDirtyInfo *ndi,
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CPUState *cpu,
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vaddr mem_vaddr,
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ram_addr_t ram_addr,
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unsigned size);
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/**
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* memory_notdirty_write_complete: finish write to non-dirty memory
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* @ndi: pointer to the opaque NotDirtyInfo struct which was initialized
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* by memory_not_dirty_write_prepare().
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*/
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void memory_notdirty_write_complete(NotDirtyInfo *ndi);
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#endif
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#endif
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