diff options
Diffstat (limited to 'include/exec/ram_addr.h')
| -rw-r--r-- | include/exec/ram_addr.h | 55 |
1 files changed, 36 insertions, 19 deletions
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index b1413a1286..5d33def09a 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -121,6 +121,7 @@ static inline bool cpu_physical_memory_get_dirty(ram_addr_t start, { DirtyMemoryBlocks *blocks; unsigned long end, page; + unsigned long idx, offset, base; bool dirty = false; assert(client < DIRTY_MEMORY_NUM); @@ -132,17 +133,22 @@ static inline bool cpu_physical_memory_get_dirty(ram_addr_t start, blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); + idx = page / DIRTY_MEMORY_BLOCK_SIZE; + offset = page % DIRTY_MEMORY_BLOCK_SIZE; + base = page - offset; while (page < end) { - unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; - unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; - unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset); - - if (find_next_bit(blocks->blocks[idx], offset, num) < num) { + unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE); + unsigned long num = next - base; + unsigned long found = find_next_bit(blocks->blocks[idx], num, offset); + if (found < num) { dirty = true; break; } - page += num; + page = next; + idx++; + offset = 0; + base += DIRTY_MEMORY_BLOCK_SIZE; } rcu_read_unlock(); @@ -156,6 +162,7 @@ static inline bool cpu_physical_memory_all_dirty(ram_addr_t start, { DirtyMemoryBlocks *blocks; unsigned long end, page; + unsigned long idx, offset, base; bool dirty = true; assert(client < DIRTY_MEMORY_NUM); @@ -167,17 +174,22 @@ static inline bool cpu_physical_memory_all_dirty(ram_addr_t start, blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); + idx = page / DIRTY_MEMORY_BLOCK_SIZE; + offset = page % DIRTY_MEMORY_BLOCK_SIZE; + base = page - offset; while (page < end) { - unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; - unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; - unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset); - - if (find_next_zero_bit(blocks->blocks[idx], offset, num) < num) { + unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE); + unsigned long num = next - base; + unsigned long found = find_next_zero_bit(blocks->blocks[idx], num, offset); + if (found < num) { dirty = false; break; } - page += num; + page = next; + idx++; + offset = 0; + base += DIRTY_MEMORY_BLOCK_SIZE; } rcu_read_unlock(); @@ -248,6 +260,7 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start, { DirtyMemoryBlocks *blocks[DIRTY_MEMORY_NUM]; unsigned long end, page; + unsigned long idx, offset, base; int i; if (!mask && !xen_enabled()) { @@ -263,25 +276,29 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start, blocks[i] = atomic_rcu_read(&ram_list.dirty_memory[i]); } + idx = page / DIRTY_MEMORY_BLOCK_SIZE; + offset = page % DIRTY_MEMORY_BLOCK_SIZE; + base = page - offset; while (page < end) { - unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; - unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; - unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset); + unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE); if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) { bitmap_set_atomic(blocks[DIRTY_MEMORY_MIGRATION]->blocks[idx], - offset, num); + offset, next - page); } if (unlikely(mask & (1 << DIRTY_MEMORY_VGA))) { bitmap_set_atomic(blocks[DIRTY_MEMORY_VGA]->blocks[idx], - offset, num); + offset, next - page); } if (unlikely(mask & (1 << DIRTY_MEMORY_CODE))) { bitmap_set_atomic(blocks[DIRTY_MEMORY_CODE]->blocks[idx], - offset, num); + offset, next - page); } - page += num; + page = next; + idx++; + offset = 0; + base += DIRTY_MEMORY_BLOCK_SIZE; } rcu_read_unlock(); |