86d38fbfa7
* Add cpu_run pre/post exec hooks, to hook the cpu just before / after it runs target code. * Refactor hooks to separate them in different files * Remove most extern variables * Reduce the amount of extra code in QEMU * Add clang-format script
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#pragma once
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// Rewritten COW cache for block devices, heavily inspired by kAFL/NYX
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// implementation.
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#include "qemu/osdep.h"
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#include "qemu/iov.h"
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#include "block/block.h"
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#define INITIAL_NB_CHUNKS_PER_DEVICE (1024 * 64)
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typedef struct SyxCowCacheDevice {
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GArray* data;
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GHashTable* positions; // blk_offset -> data_position
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} SyxCowCacheDevice;
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typedef struct SyxCowCacheLayer SyxCowCacheLayer;
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typedef struct SyxCowCacheLayer {
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GHashTable* cow_cache_devices; // H(device) -> SyxCowCacheDevice
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uint64_t chunk_size;
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uint64_t max_nb_chunks;
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QTAILQ_ENTRY(SyxCowCacheLayer) next;
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} SyxCowCacheLayer;
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typedef struct SyxCowCache {
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QTAILQ_HEAD(, SyxCowCacheLayer) layers;
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} SyxCowCache;
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SyxCowCache* syx_cow_cache_new(void);
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// lhs <- rhs
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// rhs is freed and nulled.
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void syx_cow_cache_move(SyxCowCache* lhs, SyxCowCache** rhs);
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void syx_cow_cache_push_layer(SyxCowCache* scc, uint64_t chunk_size,
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uint64_t max_size);
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void syx_cow_cache_pop_layer(SyxCowCache* scc);
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void syx_cow_cache_flush_highest_layer(SyxCowCache* scc);
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void syx_cow_cache_read_entry(SyxCowCache* scc, BlockBackend* blk,
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int64_t offset, int64_t bytes, QEMUIOVector* qiov,
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size_t qiov_offset, BdrvRequestFlags flags);
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bool syx_cow_cache_write_entry(SyxCowCache* scc, BlockBackend* blk,
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int64_t offset, int64_t bytes,
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QEMUIOVector* qiov, size_t qiov_offset,
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BdrvRequestFlags flags);
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