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For testing, it can be useful to simulate an enormous amount of memory (e.g. 2^64 RAM). This adds an MMIO device that acts as sparse memory. When something writes a nonzero value to a sparse-mem address, we allocate a block of memory. For now, since the only user of this device is the fuzzer, we do not track and free zeroed blocks. The device has a very low priority (so it can be mapped beneath actual RAM, and virtual device MMIO regions). Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
20 lines
427 B
C
20 lines
427 B
C
/*
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* A sparse memory device. Useful for fuzzing
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*
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* Copyright Red Hat Inc., 2021
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*
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* Authors:
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* Alexander Bulekov <alxndr@bu.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef SPARSE_MEM_H
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#define SPARSE_MEM_H
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#define TYPE_SPARSE_MEM "sparse-mem"
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MemoryRegion *sparse_mem_init(uint64_t addr, uint64_t length);
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#endif
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