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1 /*
2  * Declarations for cpu physical memory functions
3  *
4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
5  *
6  * Authors:
7  *  Avi Kivity <[email protected]>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or
10  * later.  See the COPYING file in the top-level directory.
11  *
12  */
13
14 /*
15  * This header is for use by exec.c and memory.c ONLY.  Do not include it.
16  * The functions declared here will be removed soon.
17  */
18
19 #ifndef RAM_ADDR_H
20 #define RAM_ADDR_H
21
22 #ifndef CONFIG_USER_ONLY
23 #include "hw/xen/xen.h"
24 #include "exec/ramlist.h"
25
26 struct RAMBlock {
27     struct rcu_head rcu;
28     struct MemoryRegion *mr;
29     uint8_t *host;
30     ram_addr_t offset;
31     ram_addr_t used_length;
32     ram_addr_t max_length;
33     void (*resized)(const char*, uint64_t length, void *host);
34     uint32_t flags;
35     /* Protected by iothread lock.  */
36     char idstr[256];
37     /* RCU-enabled, writes protected by the ramlist lock */
38     QLIST_ENTRY(RAMBlock) next;
39     QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers;
40     int fd;
41     size_t page_size;
42 };
43
44 static inline bool offset_in_ramblock(RAMBlock *b, ram_addr_t offset)
45 {
46     return (b && b->host && offset < b->used_length) ? true : false;
47 }
48
49 static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset)
50 {
51     assert(offset_in_ramblock(block, offset));
52     return (char *)block->host + offset;
53 }
54
55 long qemu_getrampagesize(void);
56 unsigned long last_ram_page(void);
57 RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
58                                    bool share, const char *mem_path,
59                                    Error **errp);
60 RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
61                                   MemoryRegion *mr, Error **errp);
62 RAMBlock *qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);
63 RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
64                                     void (*resized)(const char*,
65                                                     uint64_t length,
66                                                     void *host),
67                                     MemoryRegion *mr, Error **errp);
68 void qemu_ram_free(RAMBlock *block);
69
70 int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp);
71
72 #define DIRTY_CLIENTS_ALL     ((1 << DIRTY_MEMORY_NUM) - 1)
73 #define DIRTY_CLIENTS_NOCODE  (DIRTY_CLIENTS_ALL & ~(1 << DIRTY_MEMORY_CODE))
74
75 static inline bool cpu_physical_memory_get_dirty(ram_addr_t start,
76                                                  ram_addr_t length,
77                                                  unsigned client)
78 {
79     DirtyMemoryBlocks *blocks;
80     unsigned long end, page;
81     unsigned long idx, offset, base;
82     bool dirty = false;
83
84     assert(client < DIRTY_MEMORY_NUM);
85
86     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
87     page = start >> TARGET_PAGE_BITS;
88
89     rcu_read_lock();
90
91     blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
92
93     idx = page / DIRTY_MEMORY_BLOCK_SIZE;
94     offset = page % DIRTY_MEMORY_BLOCK_SIZE;
95     base = page - offset;
96     while (page < end) {
97         unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
98         unsigned long num = next - base;
99         unsigned long found = find_next_bit(blocks->blocks[idx], num, offset);
100         if (found < num) {
101             dirty = true;
102             break;
103         }
104
105         page = next;
106         idx++;
107         offset = 0;
108         base += DIRTY_MEMORY_BLOCK_SIZE;
109     }
110
111     rcu_read_unlock();
112
113     return dirty;
114 }
115
116 static inline bool cpu_physical_memory_all_dirty(ram_addr_t start,
117                                                  ram_addr_t length,
118                                                  unsigned client)
119 {
120     DirtyMemoryBlocks *blocks;
121     unsigned long end, page;
122     unsigned long idx, offset, base;
123     bool dirty = true;
124
125     assert(client < DIRTY_MEMORY_NUM);
126
127     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
128     page = start >> TARGET_PAGE_BITS;
129
130     rcu_read_lock();
131
132     blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
133
134     idx = page / DIRTY_MEMORY_BLOCK_SIZE;
135     offset = page % DIRTY_MEMORY_BLOCK_SIZE;
136     base = page - offset;
137     while (page < end) {
138         unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
139         unsigned long num = next - base;
140         unsigned long found = find_next_zero_bit(blocks->blocks[idx], num, offset);
141         if (found < num) {
142             dirty = false;
143             break;
144         }
145
146         page = next;
147         idx++;
148         offset = 0;
149         base += DIRTY_MEMORY_BLOCK_SIZE;
150     }
151
152     rcu_read_unlock();
153
154     return dirty;
155 }
156
157 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
158                                                       unsigned client)
159 {
160     return cpu_physical_memory_get_dirty(addr, 1, client);
161 }
162
163 static inline bool cpu_physical_memory_is_clean(ram_addr_t addr)
164 {
165     bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA);
166     bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE);
167     bool migration =
168         cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
169     return !(vga && code && migration);
170 }
171
172 static inline uint8_t cpu_physical_memory_range_includes_clean(ram_addr_t start,
173                                                                ram_addr_t length,
174                                                                uint8_t mask)
175 {
176     uint8_t ret = 0;
177
178     if (mask & (1 << DIRTY_MEMORY_VGA) &&
179         !cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_VGA)) {
180         ret |= (1 << DIRTY_MEMORY_VGA);
181     }
182     if (mask & (1 << DIRTY_MEMORY_CODE) &&
183         !cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_CODE)) {
184         ret |= (1 << DIRTY_MEMORY_CODE);
185     }
186     if (mask & (1 << DIRTY_MEMORY_MIGRATION) &&
187         !cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_MIGRATION)) {
188         ret |= (1 << DIRTY_MEMORY_MIGRATION);
189     }
190     return ret;
191 }
192
193 static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr,
194                                                       unsigned client)
195 {
196     unsigned long page, idx, offset;
197     DirtyMemoryBlocks *blocks;
198
199     assert(client < DIRTY_MEMORY_NUM);
200
201     page = addr >> TARGET_PAGE_BITS;
202     idx = page / DIRTY_MEMORY_BLOCK_SIZE;
203     offset = page % DIRTY_MEMORY_BLOCK_SIZE;
204
205     rcu_read_lock();
206
207     blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
208
209     set_bit_atomic(offset, blocks->blocks[idx]);
210
211     rcu_read_unlock();
212 }
213
214 static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
215                                                        ram_addr_t length,
216                                                        uint8_t mask)
217 {
218     DirtyMemoryBlocks *blocks[DIRTY_MEMORY_NUM];
219     unsigned long end, page;
220     unsigned long idx, offset, base;
221     int i;
222
223     if (!mask && !xen_enabled()) {
224         return;
225     }
226
227     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
228     page = start >> TARGET_PAGE_BITS;
229
230     rcu_read_lock();
231
232     for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
233         blocks[i] = atomic_rcu_read(&ram_list.dirty_memory[i]);
234     }
235
236     idx = page / DIRTY_MEMORY_BLOCK_SIZE;
237     offset = page % DIRTY_MEMORY_BLOCK_SIZE;
238     base = page - offset;
239     while (page < end) {
240         unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
241
242         if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) {
243             bitmap_set_atomic(blocks[DIRTY_MEMORY_MIGRATION]->blocks[idx],
244                               offset, next - page);
245         }
246         if (unlikely(mask & (1 << DIRTY_MEMORY_VGA))) {
247             bitmap_set_atomic(blocks[DIRTY_MEMORY_VGA]->blocks[idx],
248                               offset, next - page);
249         }
250         if (unlikely(mask & (1 << DIRTY_MEMORY_CODE))) {
251             bitmap_set_atomic(blocks[DIRTY_MEMORY_CODE]->blocks[idx],
252                               offset, next - page);
253         }
254
255         page = next;
256         idx++;
257         offset = 0;
258         base += DIRTY_MEMORY_BLOCK_SIZE;
259     }
260
261     rcu_read_unlock();
262
263     xen_hvm_modified_memory(start, length);
264 }
265
266 #if !defined(_WIN32)
267 static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
268                                                           ram_addr_t start,
269                                                           ram_addr_t pages)
270 {
271     unsigned long i, j;
272     unsigned long page_number, c;
273     hwaddr addr;
274     ram_addr_t ram_addr;
275     unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
276     unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
277     unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
278
279     /* start address is aligned at the start of a word? */
280     if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) &&
281         (hpratio == 1)) {
282         unsigned long **blocks[DIRTY_MEMORY_NUM];
283         unsigned long idx;
284         unsigned long offset;
285         long k;
286         long nr = BITS_TO_LONGS(pages);
287
288         idx = (start >> TARGET_PAGE_BITS) / DIRTY_MEMORY_BLOCK_SIZE;
289         offset = BIT_WORD((start >> TARGET_PAGE_BITS) %
290                           DIRTY_MEMORY_BLOCK_SIZE);
291
292         rcu_read_lock();
293
294         for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
295             blocks[i] = atomic_rcu_read(&ram_list.dirty_memory[i])->blocks;
296         }
297
298         for (k = 0; k < nr; k++) {
299             if (bitmap[k]) {
300                 unsigned long temp = leul_to_cpu(bitmap[k]);
301
302                 atomic_or(&blocks[DIRTY_MEMORY_MIGRATION][idx][offset], temp);
303                 atomic_or(&blocks[DIRTY_MEMORY_VGA][idx][offset], temp);
304                 if (tcg_enabled()) {
305                     atomic_or(&blocks[DIRTY_MEMORY_CODE][idx][offset], temp);
306                 }
307             }
308
309             if (++offset >= BITS_TO_LONGS(DIRTY_MEMORY_BLOCK_SIZE)) {
310                 offset = 0;
311                 idx++;
312             }
313         }
314
315         rcu_read_unlock();
316
317         xen_hvm_modified_memory(start, pages << TARGET_PAGE_BITS);
318     } else {
319         uint8_t clients = tcg_enabled() ? DIRTY_CLIENTS_ALL : DIRTY_CLIENTS_NOCODE;
320         /*
321          * bitmap-traveling is faster than memory-traveling (for addr...)
322          * especially when most of the memory is not dirty.
323          */
324         for (i = 0; i < len; i++) {
325             if (bitmap[i] != 0) {
326                 c = leul_to_cpu(bitmap[i]);
327                 do {
328                     j = ctzl(c);
329                     c &= ~(1ul << j);
330                     page_number = (i * HOST_LONG_BITS + j) * hpratio;
331                     addr = page_number * TARGET_PAGE_SIZE;
332                     ram_addr = start + addr;
333                     cpu_physical_memory_set_dirty_range(ram_addr,
334                                        TARGET_PAGE_SIZE * hpratio, clients);
335                 } while (c != 0);
336             }
337         }
338     }
339 }
340 #endif /* not _WIN32 */
341
342 bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
343                                               ram_addr_t length,
344                                               unsigned client);
345
346 DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
347     (ram_addr_t start, ram_addr_t length, unsigned client);
348
349 bool cpu_physical_memory_snapshot_get_dirty(DirtyBitmapSnapshot *snap,
350                                             ram_addr_t start,
351                                             ram_addr_t length);
352
353 static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start,
354                                                          ram_addr_t length)
355 {
356     cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_MIGRATION);
357     cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_VGA);
358     cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_CODE);
359 }
360
361
362 static inline
363 uint64_t cpu_physical_memory_sync_dirty_bitmap(unsigned long *dest,
364                                                RAMBlock *rb,
365                                                ram_addr_t start,
366                                                ram_addr_t length,
367                                                uint64_t *real_dirty_pages)
368 {
369     ram_addr_t addr;
370     start = rb->offset + start;
371     unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
372     uint64_t num_dirty = 0;
373
374     /* start address is aligned at the start of a word? */
375     if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
376         int k;
377         int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
378         unsigned long * const *src;
379         unsigned long idx = (page * BITS_PER_LONG) / DIRTY_MEMORY_BLOCK_SIZE;
380         unsigned long offset = BIT_WORD((page * BITS_PER_LONG) %
381                                         DIRTY_MEMORY_BLOCK_SIZE);
382
383         rcu_read_lock();
384
385         src = atomic_rcu_read(
386                 &ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION])->blocks;
387
388         for (k = page; k < page + nr; k++) {
389             if (src[idx][offset]) {
390                 unsigned long bits = atomic_xchg(&src[idx][offset], 0);
391                 unsigned long new_dirty;
392                 *real_dirty_pages += ctpopl(bits);
393                 new_dirty = ~dest[k];
394                 dest[k] |= bits;
395                 new_dirty &= bits;
396                 num_dirty += ctpopl(new_dirty);
397             }
398
399             if (++offset >= BITS_TO_LONGS(DIRTY_MEMORY_BLOCK_SIZE)) {
400                 offset = 0;
401                 idx++;
402             }
403         }
404
405         rcu_read_unlock();
406     } else {
407         for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
408             if (cpu_physical_memory_test_and_clear_dirty(
409                         start + addr,
410                         TARGET_PAGE_SIZE,
411                         DIRTY_MEMORY_MIGRATION)) {
412                 *real_dirty_pages += 1;
413                 long k = (start + addr) >> TARGET_PAGE_BITS;
414                 if (!test_and_set_bit(k, dest)) {
415                     num_dirty++;
416                 }
417             }
418         }
419     }
420
421     return num_dirty;
422 }
423 #endif
424 #endif
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