memory: add ref/unref
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -247,6 +247,36 @@ void memory_region_init(MemoryRegion *mr,
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struct Object *owner,
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struct Object *owner,
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const char *name,
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const char *name,
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uint64_t size);
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uint64_t size);
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/**
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* memory_region_ref: Add 1 to a memory region's reference count
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*
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* Whenever memory regions are accessed outside the BQL, they need to be
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* preserved against hot-unplug. MemoryRegions actually do not have their
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* own reference count; they piggyback on a QOM object, their "owner".
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* This function adds a reference to the owner.
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*
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* All MemoryRegions must have an owner if they can disappear, even if the
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* device they belong to operates exclusively under the BQL. This is because
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* the region could be returned at any time by memory_region_find, and this
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* is usually under guest control.
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*
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* @mr: the #MemoryRegion
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*/
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void memory_region_ref(MemoryRegion *mr);
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/**
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* memory_region_unref: Remove 1 to a memory region's reference count
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*
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* Whenever memory regions are accessed outside the BQL, they need to be
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* preserved against hot-unplug. MemoryRegions actually do not have their
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* own reference count; they piggyback on a QOM object, their "owner".
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* This function removes a reference to the owner and possibly destroys it.
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*
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* @mr: the #MemoryRegion
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*/
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void memory_region_unref(MemoryRegion *mr);
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/**
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/**
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* memory_region_init_io: Initialize an I/O memory region.
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* memory_region_init_io: Initialize an I/O memory region.
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*
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*
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14
memory.c
14
memory.c
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@ -1019,6 +1019,20 @@ Object *memory_region_owner(MemoryRegion *mr)
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return mr->owner;
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return mr->owner;
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}
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}
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void memory_region_ref(MemoryRegion *mr)
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{
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if (mr && mr->owner) {
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object_ref(mr->owner);
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}
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}
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void memory_region_unref(MemoryRegion *mr)
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{
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if (mr && mr->owner) {
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object_unref(mr->owner);
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}
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}
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uint64_t memory_region_size(MemoryRegion *mr)
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uint64_t memory_region_size(MemoryRegion *mr)
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{
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{
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if (int128_eq(mr->size, int128_2_64())) {
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if (int128_eq(mr->size, int128_2_64())) {
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