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exec: fix madvise of NULL pointer
[qemu.git] / memory.c
blobc343bf37dff321b90c650266b946961b0abefc3a
1 /*
2 * Physical memory management
3 *
4 * Copyright 2011 Red Hat, Inc. and/or its affiliates
5 *
6 * Authors:
7 * Avi Kivity <avi@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
14 */
15
16 #include "exec/memory.h"
17 #include "exec/address-spaces.h"
18 #include "exec/ioport.h"
19 #include "qapi/visitor.h"
20 #include "qemu/bitops.h"
21 #include "qom/object.h"
22 #include "trace.h"
23 #include <assert.h>
24
25 #include "exec/memory-internal.h"
26 #include "exec/ram_addr.h"
27 #include "sysemu/sysemu.h"
28
29 //#define DEBUG_UNASSIGNED
30
31 static unsigned memory_region_transaction_depth;
32 static bool memory_region_update_pending;
33 static bool ioeventfd_update_pending;
34 static bool global_dirty_log = false;
35
36 /* flat_view_mutex is taken around reading as->current_map; the critical
37 * section is extremely short, so I'm using a single mutex for every AS.
38 * We could also RCU for the read-side.
39 *
40 * The BQL is taken around transaction commits, hence both locks are taken
41 * while writing to as->current_map (with the BQL taken outside).
42 */
43 static QemuMutex flat_view_mutex;
44
45 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
46 = QTAILQ_HEAD_INITIALIZER(memory_listeners);
47
48 static QTAILQ_HEAD(, AddressSpace) address_spaces
49 = QTAILQ_HEAD_INITIALIZER(address_spaces);
50
51 static void memory_init(void)
52 {
53 qemu_mutex_init(&flat_view_mutex);
54 }
55
56 typedef struct AddrRange AddrRange;
57
58 /*
59 * Note that signed integers are needed for negative offsetting in aliases
60 * (large MemoryRegion::alias_offset).
61 */
62 struct AddrRange {
63 Int128 start;
64 Int128 size;
65 };
66
67 static AddrRange addrrange_make(Int128 start, Int128 size)
68 {
69 return (AddrRange) { start, size };
70 }
71
72 static bool addrrange_equal(AddrRange r1, AddrRange r2)
73 {
74 return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
75 }
76
77 static Int128 addrrange_end(AddrRange r)
78 {
79 return int128_add(r.start, r.size);
80 }
81
82 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
83 {
84 int128_addto(&range.start, delta);
85 return range;
86 }
87
88 static bool addrrange_contains(AddrRange range, Int128 addr)
89 {
90 return int128_ge(addr, range.start)
91 && int128_lt(addr, addrrange_end(range));
92 }
93
94 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
95 {
96 return addrrange_contains(r1, r2.start)
97 || addrrange_contains(r2, r1.start);
98 }
99
100 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
101 {
102 Int128 start = int128_max(r1.start, r2.start);
103 Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
104 return addrrange_make(start, int128_sub(end, start));
105 }
106
107 enum ListenerDirection { Forward, Reverse };
108
109 static bool memory_listener_match(MemoryListener *listener,
110 MemoryRegionSection *section)
111 {
112 return !listener->address_space_filter
113 || listener->address_space_filter == section->address_space;
114 }
115
116 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...) \
117 do { \
118 MemoryListener *_listener; \
119 \
120 switch (_direction) { \
121 case Forward: \
122 QTAILQ_FOREACH(_listener, &memory_listeners, link) { \
123 if (_listener->_callback) { \
124 _listener->_callback(_listener, ##_args); \
125 } \
126 } \
127 break; \
128 case Reverse: \
129 QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners, \
130 memory_listeners, link) { \
131 if (_listener->_callback) { \
132 _listener->_callback(_listener, ##_args); \
133 } \
134 } \
135 break; \
136 default: \
137 abort(); \
138 } \
139 } while (0)
140
141 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
142 do { \
143 MemoryListener *_listener; \
144 \
145 switch (_direction) { \
146 case Forward: \
147 QTAILQ_FOREACH(_listener, &memory_listeners, link) { \
148 if (_listener->_callback \
149 && memory_listener_match(_listener, _section)) { \
150 _listener->_callback(_listener, _section, ##_args); \
151 } \
152 } \
153 break; \
154 case Reverse: \
155 QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners, \
156 memory_listeners, link) { \
157 if (_listener->_callback \
158 && memory_listener_match(_listener, _section)) { \
159 _listener->_callback(_listener, _section, ##_args); \
160 } \
161 } \
162 break; \
163 default: \
164 abort(); \
165 } \
166 } while (0)
167
168 /* No need to ref/unref .mr, the FlatRange keeps it alive. */
169 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback) \
170 MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) { \
171 .mr = (fr)->mr, \
172 .address_space = (as), \
173 .offset_within_region = (fr)->offset_in_region, \
174 .size = (fr)->addr.size, \
175 .offset_within_address_space = int128_get64((fr)->addr.start), \
176 .readonly = (fr)->readonly, \
177 }))
178
179 struct CoalescedMemoryRange {
180 AddrRange addr;
181 QTAILQ_ENTRY(CoalescedMemoryRange) link;
182 };
183
184 struct MemoryRegionIoeventfd {
185 AddrRange addr;
186 bool match_data;
187 uint64_t data;
188 EventNotifier *e;
189 };
190
191 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
192 MemoryRegionIoeventfd b)
193 {
194 if (int128_lt(a.addr.start, b.addr.start)) {
195 return true;
196 } else if (int128_gt(a.addr.start, b.addr.start)) {
197 return false;
198 } else if (int128_lt(a.addr.size, b.addr.size)) {
199 return true;
200 } else if (int128_gt(a.addr.size, b.addr.size)) {
201 return false;
202 } else if (a.match_data < b.match_data) {
203 return true;
204 } else if (a.match_data > b.match_data) {
205 return false;
206 } else if (a.match_data) {
207 if (a.data < b.data) {
208 return true;
209 } else if (a.data > b.data) {
210 return false;
211 }
212 }
213 if (a.e < b.e) {
214 return true;
215 } else if (a.e > b.e) {
216 return false;
217 }
218 return false;
219 }
220
221 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
222 MemoryRegionIoeventfd b)
223 {
224 return !memory_region_ioeventfd_before(a, b)
225 && !memory_region_ioeventfd_before(b, a);
226 }
227
228 typedef struct FlatRange FlatRange;
229 typedef struct FlatView FlatView;
230
231 /* Range of memory in the global map. Addresses are absolute. */
232 struct FlatRange {
233 MemoryRegion *mr;
234 hwaddr offset_in_region;
235 AddrRange addr;
236 uint8_t dirty_log_mask;
237 bool romd_mode;
238 bool readonly;
239 };
240
241 /* Flattened global view of current active memory hierarchy. Kept in sorted
242 * order.
243 */
244 struct FlatView {
245 unsigned ref;
246 FlatRange *ranges;
247 unsigned nr;
248 unsigned nr_allocated;
249 };
250
251 typedef struct AddressSpaceOps AddressSpaceOps;
252
253 #define FOR_EACH_FLAT_RANGE(var, view) \
254 for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
255
256 static bool flatrange_equal(FlatRange *a, FlatRange *b)
257 {
258 return a->mr == b->mr
259 && addrrange_equal(a->addr, b->addr)
260 && a->offset_in_region == b->offset_in_region
261 && a->romd_mode == b->romd_mode
262 && a->readonly == b->readonly;
263 }
264
265 static void flatview_init(FlatView *view)
266 {
267 view->ref = 1;
268 view->ranges = NULL;
269 view->nr = 0;
270 view->nr_allocated = 0;
271 }
272
273 /* Insert a range into a given position. Caller is responsible for maintaining
274 * sorting order.
275 */
276 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
277 {
278 if (view->nr == view->nr_allocated) {
279 view->nr_allocated = MAX(2 * view->nr, 10);
280 view->ranges = g_realloc(view->ranges,
281 view->nr_allocated * sizeof(*view->ranges));
282 }
283 memmove(view->ranges + pos + 1, view->ranges + pos,
284 (view->nr - pos) * sizeof(FlatRange));
285 view->ranges[pos] = *range;
286 memory_region_ref(range->mr);
287 ++view->nr;
288 }
289
290 static void flatview_destroy(FlatView *view)
291 {
292 int i;
293
294 for (i = 0; i < view->nr; i++) {
295 memory_region_unref(view->ranges[i].mr);
296 }
297 g_free(view->ranges);
298 g_free(view);
299 }
300
301 static void flatview_ref(FlatView *view)
302 {
303 atomic_inc(&view->ref);
304 }
305
306 static void flatview_unref(FlatView *view)
307 {
308 if (atomic_fetch_dec(&view->ref) == 1) {
309 flatview_destroy(view);
310 }
311 }
312
313 static bool can_merge(FlatRange *r1, FlatRange *r2)
314 {
315 return int128_eq(addrrange_end(r1->addr), r2->addr.start)
316 && r1->mr == r2->mr
317 && int128_eq(int128_add(int128_make64(r1->offset_in_region),
318 r1->addr.size),
319 int128_make64(r2->offset_in_region))
320 && r1->dirty_log_mask == r2->dirty_log_mask
321 && r1->romd_mode == r2->romd_mode
322 && r1->readonly == r2->readonly;
323 }
324
325 /* Attempt to simplify a view by merging adjacent ranges */
326 static void flatview_simplify(FlatView *view)
327 {
328 unsigned i, j;
329
330 i = 0;
331 while (i < view->nr) {
332 j = i + 1;
333 while (j < view->nr
334 && can_merge(&view->ranges[j-1], &view->ranges[j])) {
335 int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
336 ++j;
337 }
338 ++i;
339 memmove(&view->ranges[i], &view->ranges[j],
340 (view->nr - j) * sizeof(view->ranges[j]));
341 view->nr -= j - i;
342 }
343 }
344
345 static bool memory_region_big_endian(MemoryRegion *mr)
346 {
347 #ifdef TARGET_WORDS_BIGENDIAN
348 return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
349 #else
350 return mr->ops->endianness == DEVICE_BIG_ENDIAN;
351 #endif
352 }
353
354 static bool memory_region_wrong_endianness(MemoryRegion *mr)
355 {
356 #ifdef TARGET_WORDS_BIGENDIAN
357 return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
358 #else
359 return mr->ops->endianness == DEVICE_BIG_ENDIAN;
360 #endif
361 }
362
363 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
364 {
365 if (memory_region_wrong_endianness(mr)) {
366 switch (size) {
367 case 1:
368 break;
369 case 2:
370 *data = bswap16(*data);
371 break;
372 case 4:
373 *data = bswap32(*data);
374 break;
375 case 8:
376 *data = bswap64(*data);
377 break;
378 default:
379 abort();
380 }
381 }
382 }
383
384 static void memory_region_oldmmio_read_accessor(MemoryRegion *mr,
385 hwaddr addr,
386 uint64_t *value,
387 unsigned size,
388 unsigned shift,
389 uint64_t mask)
390 {
391 uint64_t tmp;
392
393 tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
394 trace_memory_region_ops_read(mr, addr, tmp, size);
395 *value |= (tmp & mask) << shift;
396 }
397
398 static void memory_region_read_accessor(MemoryRegion *mr,
399 hwaddr addr,
400 uint64_t *value,
401 unsigned size,
402 unsigned shift,
403 uint64_t mask)
404 {
405 uint64_t tmp;
406
407 if (mr->flush_coalesced_mmio) {
408 qemu_flush_coalesced_mmio_buffer();
409 }
410 tmp = mr->ops->read(mr->opaque, addr, size);
411 trace_memory_region_ops_read(mr, addr, tmp, size);
412 *value |= (tmp & mask) << shift;
413 }
414
415 static void memory_region_oldmmio_write_accessor(MemoryRegion *mr,
416 hwaddr addr,
417 uint64_t *value,
418 unsigned size,
419 unsigned shift,
420 uint64_t mask)
421 {
422 uint64_t tmp;
423
424 tmp = (*value >> shift) & mask;
425 trace_memory_region_ops_write(mr, addr, tmp, size);
426 mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
427 }
428
429 static void memory_region_write_accessor(MemoryRegion *mr,
430 hwaddr addr,
431 uint64_t *value,
432 unsigned size,
433 unsigned shift,
434 uint64_t mask)
435 {
436 uint64_t tmp;
437
438 if (mr->flush_coalesced_mmio) {
439 qemu_flush_coalesced_mmio_buffer();
440 }
441 tmp = (*value >> shift) & mask;
442 trace_memory_region_ops_write(mr, addr, tmp, size);
443 mr->ops->write(mr->opaque, addr, tmp, size);
444 }
445
446 static void access_with_adjusted_size(hwaddr addr,
447 uint64_t *value,
448 unsigned size,
449 unsigned access_size_min,
450 unsigned access_size_max,
451 void (*access)(MemoryRegion *mr,
452 hwaddr addr,
453 uint64_t *value,
454 unsigned size,
455 unsigned shift,
456 uint64_t mask),
457 MemoryRegion *mr)
458 {
459 uint64_t access_mask;
460 unsigned access_size;
461 unsigned i;
462
463 if (!access_size_min) {
464 access_size_min = 1;
465 }
466 if (!access_size_max) {
467 access_size_max = 4;
468 }
469
470 /* FIXME: support unaligned access? */
471 access_size = MAX(MIN(size, access_size_max), access_size_min);
472 access_mask = -1ULL >> (64 - access_size * 8);
473 if (memory_region_big_endian(mr)) {
474 for (i = 0; i < size; i += access_size) {
475 access(mr, addr + i, value, access_size,
476 (size - access_size - i) * 8, access_mask);
477 }
478 } else {
479 for (i = 0; i < size; i += access_size) {
480 access(mr, addr + i, value, access_size, i * 8, access_mask);
481 }
482 }
483 }
484
485 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
486 {
487 AddressSpace *as;
488
489 while (mr->container) {
490 mr = mr->container;
491 }
492 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
493 if (mr == as->root) {
494 return as;
495 }
496 }
497 return NULL;
498 }
499
500 /* Render a memory region into the global view. Ranges in @view obscure
501 * ranges in @mr.
502 */
503 static void render_memory_region(FlatView *view,
504 MemoryRegion *mr,
505 Int128 base,
506 AddrRange clip,
507 bool readonly)
508 {
509 MemoryRegion *subregion;
510 unsigned i;
511 hwaddr offset_in_region;
512 Int128 remain;
513 Int128 now;
514 FlatRange fr;
515 AddrRange tmp;
516
517 if (!mr->enabled) {
518 return;
519 }
520
521 int128_addto(&base, int128_make64(mr->addr));
522 readonly |= mr->readonly;
523
524 tmp = addrrange_make(base, mr->size);
525
526 if (!addrrange_intersects(tmp, clip)) {
527 return;
528 }
529
530 clip = addrrange_intersection(tmp, clip);
531
532 if (mr->alias) {
533 int128_subfrom(&base, int128_make64(mr->alias->addr));
534 int128_subfrom(&base, int128_make64(mr->alias_offset));
535 render_memory_region(view, mr->alias, base, clip, readonly);
536 return;
537 }
538
539 /* Render subregions in priority order. */
540 QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
541 render_memory_region(view, subregion, base, clip, readonly);
542 }
543
544 if (!mr->terminates) {
545 return;
546 }
547
548 offset_in_region = int128_get64(int128_sub(clip.start, base));
549 base = clip.start;
550 remain = clip.size;
551
552 fr.mr = mr;
553 fr.dirty_log_mask = mr->dirty_log_mask;
554 fr.romd_mode = mr->romd_mode;
555 fr.readonly = readonly;
556
557 /* Render the region itself into any gaps left by the current view. */
558 for (i = 0; i < view->nr && int128_nz(remain); ++i) {
559 if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
560 continue;
561 }
562 if (int128_lt(base, view->ranges[i].addr.start)) {
563 now = int128_min(remain,
564 int128_sub(view->ranges[i].addr.start, base));
565 fr.offset_in_region = offset_in_region;
566 fr.addr = addrrange_make(base, now);
567 flatview_insert(view, i, &fr);
568 ++i;
569 int128_addto(&base, now);
570 offset_in_region += int128_get64(now);
571 int128_subfrom(&remain, now);
572 }
573 now = int128_sub(int128_min(int128_add(base, remain),
574 addrrange_end(view->ranges[i].addr)),
575 base);
576 int128_addto(&base, now);
577 offset_in_region += int128_get64(now);
578 int128_subfrom(&remain, now);
579 }
580 if (int128_nz(remain)) {
581 fr.offset_in_region = offset_in_region;
582 fr.addr = addrrange_make(base, remain);
583 flatview_insert(view, i, &fr);
584 }
585 }
586
587 /* Render a memory topology into a list of disjoint absolute ranges. */
588 static FlatView *generate_memory_topology(MemoryRegion *mr)
589 {
590 FlatView *view;
591
592 view = g_new(FlatView, 1);
593 flatview_init(view);
594
595 if (mr) {
596 render_memory_region(view, mr, int128_zero(),
597 addrrange_make(int128_zero(), int128_2_64()), false);
598 }
599 flatview_simplify(view);
600
601 return view;
602 }
603
604 static void address_space_add_del_ioeventfds(AddressSpace *as,
605 MemoryRegionIoeventfd *fds_new,
606 unsigned fds_new_nb,
607 MemoryRegionIoeventfd *fds_old,
608 unsigned fds_old_nb)
609 {
610 unsigned iold, inew;
611 MemoryRegionIoeventfd *fd;
612 MemoryRegionSection section;
613
614 /* Generate a symmetric difference of the old and new fd sets, adding
615 * and deleting as necessary.
616 */
617
618 iold = inew = 0;
619 while (iold < fds_old_nb || inew < fds_new_nb) {
620 if (iold < fds_old_nb
621 && (inew == fds_new_nb
622 || memory_region_ioeventfd_before(fds_old[iold],
623 fds_new[inew]))) {
624 fd = &fds_old[iold];
625 section = (MemoryRegionSection) {
626 .address_space = as,
627 .offset_within_address_space = int128_get64(fd->addr.start),
628 .size = fd->addr.size,
629 };
630 MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
631 fd->match_data, fd->data, fd->e);
632 ++iold;
633 } else if (inew < fds_new_nb
634 && (iold == fds_old_nb
635 || memory_region_ioeventfd_before(fds_new[inew],
636 fds_old[iold]))) {
637 fd = &fds_new[inew];
638 section = (MemoryRegionSection) {
639 .address_space = as,
640 .offset_within_address_space = int128_get64(fd->addr.start),
641 .size = fd->addr.size,
642 };
643 MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
644 fd->match_data, fd->data, fd->e);
645 ++inew;
646 } else {
647 ++iold;
648 ++inew;
649 }
650 }
651 }
652
653 static FlatView *address_space_get_flatview(AddressSpace *as)
654 {
655 FlatView *view;
656
657 qemu_mutex_lock(&flat_view_mutex);
658 view = as->current_map;
659 flatview_ref(view);
660 qemu_mutex_unlock(&flat_view_mutex);
661 return view;
662 }
663
664 static void address_space_update_ioeventfds(AddressSpace *as)
665 {
666 FlatView *view;
667 FlatRange *fr;
668 unsigned ioeventfd_nb = 0;
669 MemoryRegionIoeventfd *ioeventfds = NULL;
670 AddrRange tmp;
671 unsigned i;
672
673 view = address_space_get_flatview(as);
674 FOR_EACH_FLAT_RANGE(fr, view) {
675 for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
676 tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
677 int128_sub(fr->addr.start,
678 int128_make64(fr->offset_in_region)));
679 if (addrrange_intersects(fr->addr, tmp)) {
680 ++ioeventfd_nb;
681 ioeventfds = g_realloc(ioeventfds,
682 ioeventfd_nb * sizeof(*ioeventfds));
683 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
684 ioeventfds[ioeventfd_nb-1].addr = tmp;
685 }
686 }
687 }
688
689 address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
690 as->ioeventfds, as->ioeventfd_nb);
691
692 g_free(as->ioeventfds);
693 as->ioeventfds = ioeventfds;
694 as->ioeventfd_nb = ioeventfd_nb;
695 flatview_unref(view);
696 }
697
698 static void address_space_update_topology_pass(AddressSpace *as,
699 const FlatView *old_view,
700 const FlatView *new_view,
701 bool adding)
702 {
703 unsigned iold, inew;
704 FlatRange *frold, *frnew;
705
706 /* Generate a symmetric difference of the old and new memory maps.
707 * Kill ranges in the old map, and instantiate ranges in the new map.
708 */
709 iold = inew = 0;
710 while (iold < old_view->nr || inew < new_view->nr) {
711 if (iold < old_view->nr) {
712 frold = &old_view->ranges[iold];
713 } else {
714 frold = NULL;
715 }
716 if (inew < new_view->nr) {
717 frnew = &new_view->ranges[inew];
718 } else {
719 frnew = NULL;
720 }
721
722 if (frold
723 && (!frnew
724 || int128_lt(frold->addr.start, frnew->addr.start)
725 || (int128_eq(frold->addr.start, frnew->addr.start)
726 && !flatrange_equal(frold, frnew)))) {
727 /* In old but not in new, or in both but attributes changed. */
728
729 if (!adding) {
730 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
731 }
732
733 ++iold;
734 } else if (frold && frnew && flatrange_equal(frold, frnew)) {
735 /* In both and unchanged (except logging may have changed) */
736
737 if (adding) {
738 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
739 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
740 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
741 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
742 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
743 }
744 }
745
746 ++iold;
747 ++inew;
748 } else {
749 /* In new */
750
751 if (adding) {
752 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
753 }
754
755 ++inew;
756 }
757 }
758 }
759
760
761 static void address_space_update_topology(AddressSpace *as)
762 {
763 FlatView *old_view = address_space_get_flatview(as);
764 FlatView *new_view = generate_memory_topology(as->root);
765
766 address_space_update_topology_pass(as, old_view, new_view, false);
767 address_space_update_topology_pass(as, old_view, new_view, true);
768
769 qemu_mutex_lock(&flat_view_mutex);
770 flatview_unref(as->current_map);
771 as->current_map = new_view;
772 qemu_mutex_unlock(&flat_view_mutex);
773
774 /* Note that all the old MemoryRegions are still alive up to this
775 * point. This relieves most MemoryListeners from the need to
776 * ref/unref the MemoryRegions they get---unless they use them
777 * outside the iothread mutex, in which case precise reference
778 * counting is necessary.
779 */
780 flatview_unref(old_view);
781
782 address_space_update_ioeventfds(as);
783 }
784
785 void memory_region_transaction_begin(void)
786 {
787 qemu_flush_coalesced_mmio_buffer();
788 ++memory_region_transaction_depth;
789 }
790
791 static void memory_region_clear_pending(void)
792 {
793 memory_region_update_pending = false;
794 ioeventfd_update_pending = false;
795 }
796
797 void memory_region_transaction_commit(void)
798 {
799 AddressSpace *as;
800
801 assert(memory_region_transaction_depth);
802 --memory_region_transaction_depth;
803 if (!memory_region_transaction_depth) {
804 if (memory_region_update_pending) {
805 MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
806
807 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
808 address_space_update_topology(as);
809 }
810
811 MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
812 } else if (ioeventfd_update_pending) {
813 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
814 address_space_update_ioeventfds(as);
815 }
816 }
817 memory_region_clear_pending();
818 }
819 }
820
821 static void memory_region_destructor_none(MemoryRegion *mr)
822 {
823 }
824
825 static void memory_region_destructor_ram(MemoryRegion *mr)
826 {
827 qemu_ram_free(mr->ram_addr);
828 }
829
830 static void memory_region_destructor_alias(MemoryRegion *mr)
831 {
832 memory_region_unref(mr->alias);
833 }
834
835 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
836 {
837 qemu_ram_free_from_ptr(mr->ram_addr);
838 }
839
840 static void memory_region_destructor_rom_device(MemoryRegion *mr)
841 {
842 qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
843 }
844
845 static bool memory_region_need_escape(char c)
846 {
847 return c == '/' || c == '[' || c == '\\' || c == ']';
848 }
849
850 static char *memory_region_escape_name(const char *name)
851 {
852 const char *p;
853 char *escaped, *q;
854 uint8_t c;
855 size_t bytes = 0;
856
857 for (p = name; *p; p++) {
858 bytes += memory_region_need_escape(*p) ? 4 : 1;
859 }
860 if (bytes == p - name) {
861 return g_memdup(name, bytes + 1);
862 }
863
864 escaped = g_malloc(bytes + 1);
865 for (p = name, q = escaped; *p; p++) {
866 c = *p;
867 if (unlikely(memory_region_need_escape(c))) {
868 *q++ = '\\';
869 *q++ = 'x';
870 *q++ = "0123456789abcdef"[c >> 4];
871 c = "0123456789abcdef"[c & 15];
872 }
873 *q++ = c;
874 }
875 *q = 0;
876 return escaped;
877 }
878
879 void memory_region_init(MemoryRegion *mr,
880 Object *owner,
881 const char *name,
882 uint64_t size)
883 {
884 if (!owner) {
885 owner = qdev_get_machine();
886 }
887
888 object_initialize(mr, sizeof(*mr), TYPE_MEMORY_REGION);
889 mr->size = int128_make64(size);
890 if (size == UINT64_MAX) {
891 mr->size = int128_2_64();
892 }
893 mr->name = g_strdup(name);
894
895 if (name) {
896 char *escaped_name = memory_region_escape_name(name);
897 char *name_array = g_strdup_printf("%s[*]", escaped_name);
898 object_property_add_child(owner, name_array, OBJECT(mr), &error_abort);
899 object_unref(OBJECT(mr));
900 g_free(name_array);
901 g_free(escaped_name);
902 }
903 }
904
905 static void memory_region_get_addr(Object *obj, Visitor *v, void *opaque,
906 const char *name, Error **errp)
907 {
908 MemoryRegion *mr = MEMORY_REGION(obj);
909 uint64_t value = mr->addr;
910
911 visit_type_uint64(v, &value, name, errp);
912 }
913
914 static void memory_region_get_container(Object *obj, Visitor *v, void *opaque,
915 const char *name, Error **errp)
916 {
917 MemoryRegion *mr = MEMORY_REGION(obj);
918 gchar *path = (gchar *)"";
919
920 if (mr->container) {
921 path = object_get_canonical_path(OBJECT(mr->container));
922 }
923 visit_type_str(v, &path, name, errp);
924 if (mr->container) {
925 g_free(path);
926 }
927 }
928
929 static Object *memory_region_resolve_container(Object *obj, void *opaque,
930 const char *part)
931 {
932 MemoryRegion *mr = MEMORY_REGION(obj);
933
934 return OBJECT(mr->container);
935 }
936
937 static void memory_region_get_priority(Object *obj, Visitor *v, void *opaque,
938 const char *name, Error **errp)
939 {
940 MemoryRegion *mr = MEMORY_REGION(obj);
941 int32_t value = mr->priority;
942
943 visit_type_int32(v, &value, name, errp);
944 }
945
946 static bool memory_region_get_may_overlap(Object *obj, Error **errp)
947 {
948 MemoryRegion *mr = MEMORY_REGION(obj);
949
950 return mr->may_overlap;
951 }
952
953 static void memory_region_get_size(Object *obj, Visitor *v, void *opaque,
954 const char *name, Error **errp)
955 {
956 MemoryRegion *mr = MEMORY_REGION(obj);
957 uint64_t value = memory_region_size(mr);
958
959 visit_type_uint64(v, &value, name, errp);
960 }
961
962 static void memory_region_initfn(Object *obj)
963 {
964 MemoryRegion *mr = MEMORY_REGION(obj);
965 ObjectProperty *op;
966
967 mr->ops = &unassigned_mem_ops;
968 mr->enabled = true;
969 mr->romd_mode = true;
970 mr->destructor = memory_region_destructor_none;
971 QTAILQ_INIT(&mr->subregions);
972 QTAILQ_INIT(&mr->coalesced);
973
974 op = object_property_add(OBJECT(mr), "container",
975 "link<" TYPE_MEMORY_REGION ">",
976 memory_region_get_container,
977 NULL, /* memory_region_set_container */
978 NULL, NULL, &error_abort);
979 op->resolve = memory_region_resolve_container;
980
981 object_property_add(OBJECT(mr), "addr", "uint64",
982 memory_region_get_addr,
983 NULL, /* memory_region_set_addr */
984 NULL, NULL, &error_abort);
985 object_property_add(OBJECT(mr), "priority", "uint32",
986 memory_region_get_priority,
987 NULL, /* memory_region_set_priority */
988 NULL, NULL, &error_abort);
989 object_property_add_bool(OBJECT(mr), "may-overlap",
990 memory_region_get_may_overlap,
991 NULL, /* memory_region_set_may_overlap */
992 &error_abort);
993 object_property_add(OBJECT(mr), "size", "uint64",
994 memory_region_get_size,
995 NULL, /* memory_region_set_size, */
996 NULL, NULL, &error_abort);
997 }
998
999 static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
1000 unsigned size)
1001 {
1002 #ifdef DEBUG_UNASSIGNED
1003 printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
1004 #endif
1005 if (current_cpu != NULL) {
1006 cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
1007 }
1008 return 0;
1009 }
1010
1011 static void unassigned_mem_write(void *opaque, hwaddr addr,
1012 uint64_t val, unsigned size)
1013 {
1014 #ifdef DEBUG_UNASSIGNED
1015 printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
1016 #endif
1017 if (current_cpu != NULL) {
1018 cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
1019 }
1020 }
1021
1022 static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
1023 unsigned size, bool is_write)
1024 {
1025 return false;
1026 }
1027
1028 const MemoryRegionOps unassigned_mem_ops = {
1029 .valid.accepts = unassigned_mem_accepts,
1030 .endianness = DEVICE_NATIVE_ENDIAN,
1031 };
1032
1033 bool memory_region_access_valid(MemoryRegion *mr,
1034 hwaddr addr,
1035 unsigned size,
1036 bool is_write)
1037 {
1038 int access_size_min, access_size_max;
1039 int access_size, i;
1040
1041 if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
1042 return false;
1043 }
1044
1045 if (!mr->ops->valid.accepts) {
1046 return true;
1047 }
1048
1049 access_size_min = mr->ops->valid.min_access_size;
1050 if (!mr->ops->valid.min_access_size) {
1051 access_size_min = 1;
1052 }
1053
1054 access_size_max = mr->ops->valid.max_access_size;
1055 if (!mr->ops->valid.max_access_size) {
1056 access_size_max = 4;
1057 }
1058
1059 access_size = MAX(MIN(size, access_size_max), access_size_min);
1060 for (i = 0; i < size; i += access_size) {
1061 if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size,
1062 is_write)) {
1063 return false;
1064 }
1065 }
1066
1067 return true;
1068 }
1069
1070 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
1071 hwaddr addr,
1072 unsigned size)
1073 {
1074 uint64_t data = 0;
1075
1076 if (mr->ops->read) {
1077 access_with_adjusted_size(addr, &data, size,
1078 mr->ops->impl.min_access_size,
1079 mr->ops->impl.max_access_size,
1080 memory_region_read_accessor, mr);
1081 } else {
1082 access_with_adjusted_size(addr, &data, size, 1, 4,
1083 memory_region_oldmmio_read_accessor, mr);
1084 }
1085
1086 return data;
1087 }
1088
1089 static bool memory_region_dispatch_read(MemoryRegion *mr,
1090 hwaddr addr,
1091 uint64_t *pval,
1092 unsigned size)
1093 {
1094 if (!memory_region_access_valid(mr, addr, size, false)) {
1095 *pval = unassigned_mem_read(mr, addr, size);
1096 return true;
1097 }
1098
1099 *pval = memory_region_dispatch_read1(mr, addr, size);
1100 adjust_endianness(mr, pval, size);
1101 return false;
1102 }
1103
1104 static bool memory_region_dispatch_write(MemoryRegion *mr,
1105 hwaddr addr,
1106 uint64_t data,
1107 unsigned size)
1108 {
1109 if (!memory_region_access_valid(mr, addr, size, true)) {
1110 unassigned_mem_write(mr, addr, data, size);
1111 return true;
1112 }
1113
1114 adjust_endianness(mr, &data, size);
1115
1116 if (mr->ops->write) {
1117 access_with_adjusted_size(addr, &data, size,
1118 mr->ops->impl.min_access_size,
1119 mr->ops->impl.max_access_size,
1120 memory_region_write_accessor, mr);
1121 } else {
1122 access_with_adjusted_size(addr, &data, size, 1, 4,
1123 memory_region_oldmmio_write_accessor, mr);
1124 }
1125 return false;
1126 }
1127
1128 void memory_region_init_io(MemoryRegion *mr,
1129 Object *owner,
1130 const MemoryRegionOps *ops,
1131 void *opaque,
1132 const char *name,
1133 uint64_t size)
1134 {
1135 memory_region_init(mr, owner, name, size);
1136 mr->ops = ops;
1137 mr->opaque = opaque;
1138 mr->terminates = true;
1139 mr->ram_addr = ~(ram_addr_t)0;
1140 }
1141
1142 void memory_region_init_ram(MemoryRegion *mr,
1143 Object *owner,
1144 const char *name,
1145 uint64_t size,
1146 Error **errp)
1147 {
1148 memory_region_init(mr, owner, name, size);
1149 mr->ram = true;
1150 mr->terminates = true;
1151 mr->destructor = memory_region_destructor_ram;
1152 mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1153 }
1154
1155 void memory_region_init_resizeable_ram(MemoryRegion *mr,
1156 Object *owner,
1157 const char *name,
1158 uint64_t size,
1159 uint64_t max_size,
1160 void (*resized)(const char*,
1161 uint64_t length,
1162 void *host),
1163 Error **errp)
1164 {
1165 memory_region_init(mr, owner, name, size);
1166 mr->ram = true;
1167 mr->terminates = true;
1168 mr->destructor = memory_region_destructor_ram;
1169 mr->ram_addr = qemu_ram_alloc_resizeable(size, max_size, resized, mr, errp);
1170 }
1171
1172 #ifdef __linux__
1173 void memory_region_init_ram_from_file(MemoryRegion *mr,
1174 struct Object *owner,
1175 const char *name,
1176 uint64_t size,
1177 bool share,
1178 const char *path,
1179 Error **errp)
1180 {
1181 memory_region_init(mr, owner, name, size);
1182 mr->ram = true;
1183 mr->terminates = true;
1184 mr->destructor = memory_region_destructor_ram;
1185 mr->ram_addr = qemu_ram_alloc_from_file(size, mr, share, path, errp);
1186 }
1187 #endif
1188
1189 void memory_region_init_ram_ptr(MemoryRegion *mr,
1190 Object *owner,
1191 const char *name,
1192 uint64_t size,
1193 void *ptr)
1194 {
1195 memory_region_init(mr, owner, name, size);
1196 mr->ram = true;
1197 mr->terminates = true;
1198 mr->destructor = memory_region_destructor_ram_from_ptr;
1199
1200 /* qemu_ram_alloc_from_ptr cannot fail with ptr != NULL. */
1201 assert(ptr != NULL);
1202 mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr, &error_abort);
1203 }
1204
1205 void memory_region_set_skip_dump(MemoryRegion *mr)
1206 {
1207 mr->skip_dump = true;
1208 }
1209
1210 void memory_region_init_alias(MemoryRegion *mr,
1211 Object *owner,
1212 const char *name,
1213 MemoryRegion *orig,
1214 hwaddr offset,
1215 uint64_t size)
1216 {
1217 memory_region_init(mr, owner, name, size);
1218 memory_region_ref(orig);
1219 mr->destructor = memory_region_destructor_alias;
1220 mr->alias = orig;
1221 mr->alias_offset = offset;
1222 }
1223
1224 void memory_region_init_rom_device(MemoryRegion *mr,
1225 Object *owner,
1226 const MemoryRegionOps *ops,
1227 void *opaque,
1228 const char *name,
1229 uint64_t size,
1230 Error **errp)
1231 {
1232 memory_region_init(mr, owner, name, size);
1233 mr->ops = ops;
1234 mr->opaque = opaque;
1235 mr->terminates = true;
1236 mr->rom_device = true;
1237 mr->destructor = memory_region_destructor_rom_device;
1238 mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1239 }
1240
1241 void memory_region_init_iommu(MemoryRegion *mr,
1242 Object *owner,
1243 const MemoryRegionIOMMUOps *ops,
1244 const char *name,
1245 uint64_t size)
1246 {
1247 memory_region_init(mr, owner, name, size);
1248 mr->iommu_ops = ops,
1249 mr->terminates = true; /* then re-forwards */
1250 notifier_list_init(&mr->iommu_notify);
1251 }
1252
1253 void memory_region_init_reservation(MemoryRegion *mr,
1254 Object *owner,
1255 const char *name,
1256 uint64_t size)
1257 {
1258 memory_region_init_io(mr, owner, &unassigned_mem_ops, mr, name, size);
1259 }
1260
1261 static void memory_region_finalize(Object *obj)
1262 {
1263 MemoryRegion *mr = MEMORY_REGION(obj);
1264
1265 assert(QTAILQ_EMPTY(&mr->subregions));
1266 assert(memory_region_transaction_depth == 0);
1267 mr->destructor(mr);
1268 memory_region_clear_coalescing(mr);
1269 g_free((char *)mr->name);
1270 g_free(mr->ioeventfds);
1271 }
1272
1273 Object *memory_region_owner(MemoryRegion *mr)
1274 {
1275 Object *obj = OBJECT(mr);
1276 return obj->parent;
1277 }
1278
1279 void memory_region_ref(MemoryRegion *mr)
1280 {
1281 /* MMIO callbacks most likely will access data that belongs
1282 * to the owner, hence the need to ref/unref the owner whenever
1283 * the memory region is in use.
1284 *
1285 * The memory region is a child of its owner. As long as the
1286 * owner doesn't call unparent itself on the memory region,
1287 * ref-ing the owner will also keep the memory region alive.
1288 * Memory regions without an owner are supposed to never go away,
1289 * but we still ref/unref them for debugging purposes.
1290 */
1291 Object *obj = OBJECT(mr);
1292 if (obj && obj->parent) {
1293 object_ref(obj->parent);
1294 } else {
1295 object_ref(obj);
1296 }
1297 }
1298
1299 void memory_region_unref(MemoryRegion *mr)
1300 {
1301 Object *obj = OBJECT(mr);
1302 if (obj && obj->parent) {
1303 object_unref(obj->parent);
1304 } else {
1305 object_unref(obj);
1306 }
1307 }
1308
1309 uint64_t memory_region_size(MemoryRegion *mr)
1310 {
1311 if (int128_eq(mr->size, int128_2_64())) {
1312 return UINT64_MAX;
1313 }
1314 return int128_get64(mr->size);
1315 }
1316
1317 const char *memory_region_name(const MemoryRegion *mr)
1318 {
1319 if (!mr->name) {
1320 ((MemoryRegion *)mr)->name =
1321 object_get_canonical_path_component(OBJECT(mr));
1322 }
1323 return mr->name;
1324 }
1325
1326 bool memory_region_is_ram(MemoryRegion *mr)
1327 {
1328 return mr->ram;
1329 }
1330
1331 bool memory_region_is_skip_dump(MemoryRegion *mr)
1332 {
1333 return mr->skip_dump;
1334 }
1335
1336 bool memory_region_is_logging(MemoryRegion *mr)
1337 {
1338 return mr->dirty_log_mask;
1339 }
1340
1341 bool memory_region_is_rom(MemoryRegion *mr)
1342 {
1343 return mr->ram && mr->readonly;
1344 }
1345
1346 bool memory_region_is_iommu(MemoryRegion *mr)
1347 {
1348 return mr->iommu_ops;
1349 }
1350
1351 void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
1352 {
1353 notifier_list_add(&mr->iommu_notify, n);
1354 }
1355
1356 void memory_region_unregister_iommu_notifier(Notifier *n)
1357 {
1358 notifier_remove(n);
1359 }
1360
1361 void memory_region_notify_iommu(MemoryRegion *mr,
1362 IOMMUTLBEntry entry)
1363 {
1364 assert(memory_region_is_iommu(mr));
1365 notifier_list_notify(&mr->iommu_notify, &entry);
1366 }
1367
1368 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1369 {
1370 uint8_t mask = 1 << client;
1371
1372 memory_region_transaction_begin();
1373 mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1374 memory_region_update_pending |= mr->enabled;
1375 memory_region_transaction_commit();
1376 }
1377
1378 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1379 hwaddr size, unsigned client)
1380 {
1381 assert(mr->terminates);
1382 return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1383 }
1384
1385 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1386 hwaddr size)
1387 {
1388 assert(mr->terminates);
1389 cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size);
1390 }
1391
1392 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1393 hwaddr size, unsigned client)
1394 {
1395 bool ret;
1396 assert(mr->terminates);
1397 ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1398 if (ret) {
1399 cpu_physical_memory_reset_dirty(mr->ram_addr + addr, size, client);
1400 }
1401 return ret;
1402 }
1403
1404
1405 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1406 {
1407 AddressSpace *as;
1408 FlatRange *fr;
1409
1410 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1411 FlatView *view = address_space_get_flatview(as);
1412 FOR_EACH_FLAT_RANGE(fr, view) {
1413 if (fr->mr == mr) {
1414 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1415 }
1416 }
1417 flatview_unref(view);
1418 }
1419 }
1420
1421 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1422 {
1423 if (mr->readonly != readonly) {
1424 memory_region_transaction_begin();
1425 mr->readonly = readonly;
1426 memory_region_update_pending |= mr->enabled;
1427 memory_region_transaction_commit();
1428 }
1429 }
1430
1431 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1432 {
1433 if (mr->romd_mode != romd_mode) {
1434 memory_region_transaction_begin();
1435 mr->romd_mode = romd_mode;
1436 memory_region_update_pending |= mr->enabled;
1437 memory_region_transaction_commit();
1438 }
1439 }
1440
1441 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1442 hwaddr size, unsigned client)
1443 {
1444 assert(mr->terminates);
1445 cpu_physical_memory_reset_dirty(mr->ram_addr + addr, size, client);
1446 }
1447
1448 int memory_region_get_fd(MemoryRegion *mr)
1449 {
1450 if (mr->alias) {
1451 return memory_region_get_fd(mr->alias);
1452 }
1453
1454 assert(mr->terminates);
1455
1456 return qemu_get_ram_fd(mr->ram_addr & TARGET_PAGE_MASK);
1457 }
1458
1459 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1460 {
1461 if (mr->alias) {
1462 return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1463 }
1464
1465 assert(mr->terminates);
1466
1467 return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1468 }
1469
1470 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1471 {
1472 FlatView *view;
1473 FlatRange *fr;
1474 CoalescedMemoryRange *cmr;
1475 AddrRange tmp;
1476 MemoryRegionSection section;
1477
1478 view = address_space_get_flatview(as);
1479 FOR_EACH_FLAT_RANGE(fr, view) {
1480 if (fr->mr == mr) {
1481 section = (MemoryRegionSection) {
1482 .address_space = as,
1483 .offset_within_address_space = int128_get64(fr->addr.start),
1484 .size = fr->addr.size,
1485 };
1486
1487 MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1488 int128_get64(fr->addr.start),
1489 int128_get64(fr->addr.size));
1490 QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1491 tmp = addrrange_shift(cmr->addr,
1492 int128_sub(fr->addr.start,
1493 int128_make64(fr->offset_in_region)));
1494 if (!addrrange_intersects(tmp, fr->addr)) {
1495 continue;
1496 }
1497 tmp = addrrange_intersection(tmp, fr->addr);
1498 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1499 int128_get64(tmp.start),
1500 int128_get64(tmp.size));
1501 }
1502 }
1503 }
1504 flatview_unref(view);
1505 }
1506
1507 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1508 {
1509 AddressSpace *as;
1510
1511 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1512 memory_region_update_coalesced_range_as(mr, as);
1513 }
1514 }
1515
1516 void memory_region_set_coalescing(MemoryRegion *mr)
1517 {
1518 memory_region_clear_coalescing(mr);
1519 memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1520 }
1521
1522 void memory_region_add_coalescing(MemoryRegion *mr,
1523 hwaddr offset,
1524 uint64_t size)
1525 {
1526 CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1527
1528 cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1529 QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1530 memory_region_update_coalesced_range(mr);
1531 memory_region_set_flush_coalesced(mr);
1532 }
1533
1534 void memory_region_clear_coalescing(MemoryRegion *mr)
1535 {
1536 CoalescedMemoryRange *cmr;
1537 bool updated = false;
1538
1539 qemu_flush_coalesced_mmio_buffer();
1540 mr->flush_coalesced_mmio = false;
1541
1542 while (!QTAILQ_EMPTY(&mr->coalesced)) {
1543 cmr = QTAILQ_FIRST(&mr->coalesced);
1544 QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1545 g_free(cmr);
1546 updated = true;
1547 }
1548
1549 if (updated) {
1550 memory_region_update_coalesced_range(mr);
1551 }
1552 }
1553
1554 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1555 {
1556 mr->flush_coalesced_mmio = true;
1557 }
1558
1559 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1560 {
1561 qemu_flush_coalesced_mmio_buffer();
1562 if (QTAILQ_EMPTY(&mr->coalesced)) {
1563 mr->flush_coalesced_mmio = false;
1564 }
1565 }
1566
1567 void memory_region_add_eventfd(MemoryRegion *mr,
1568 hwaddr addr,
1569 unsigned size,
1570 bool match_data,
1571 uint64_t data,
1572 EventNotifier *e)
1573 {
1574 MemoryRegionIoeventfd mrfd = {
1575 .addr.start = int128_make64(addr),
1576 .addr.size = int128_make64(size),
1577 .match_data = match_data,
1578 .data = data,
1579 .e = e,
1580 };
1581 unsigned i;
1582
1583 adjust_endianness(mr, &mrfd.data, size);
1584 memory_region_transaction_begin();
1585 for (i = 0; i < mr->ioeventfd_nb; ++i) {
1586 if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1587 break;
1588 }
1589 }
1590 ++mr->ioeventfd_nb;
1591 mr->ioeventfds = g_realloc(mr->ioeventfds,
1592 sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1593 memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1594 sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1595 mr->ioeventfds[i] = mrfd;
1596 ioeventfd_update_pending |= mr->enabled;
1597 memory_region_transaction_commit();
1598 }
1599
1600 void memory_region_del_eventfd(MemoryRegion *mr,
1601 hwaddr addr,
1602 unsigned size,
1603 bool match_data,
1604 uint64_t data,
1605 EventNotifier *e)
1606 {
1607 MemoryRegionIoeventfd mrfd = {
1608 .addr.start = int128_make64(addr),
1609 .addr.size = int128_make64(size),
1610 .match_data = match_data,
1611 .data = data,
1612 .e = e,
1613 };
1614 unsigned i;
1615
1616 adjust_endianness(mr, &mrfd.data, size);
1617 memory_region_transaction_begin();
1618 for (i = 0; i < mr->ioeventfd_nb; ++i) {
1619 if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1620 break;
1621 }
1622 }
1623 assert(i != mr->ioeventfd_nb);
1624 memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1625 sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1626 --mr->ioeventfd_nb;
1627 mr->ioeventfds = g_realloc(mr->ioeventfds,
1628 sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1629 ioeventfd_update_pending |= mr->enabled;
1630 memory_region_transaction_commit();
1631 }
1632
1633 static void memory_region_update_container_subregions(MemoryRegion *subregion)
1634 {
1635 hwaddr offset = subregion->addr;
1636 MemoryRegion *mr = subregion->container;
1637 MemoryRegion *other;
1638
1639 memory_region_transaction_begin();
1640
1641 memory_region_ref(subregion);
1642 QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1643 if (subregion->may_overlap || other->may_overlap) {
1644 continue;
1645 }
1646 if (int128_ge(int128_make64(offset),
1647 int128_add(int128_make64(other->addr), other->size))
1648 || int128_le(int128_add(int128_make64(offset), subregion->size),
1649 int128_make64(other->addr))) {
1650 continue;
1651 }
1652 #if 0
1653 printf("warning: subregion collision %llx/%llx (%s) "
1654 "vs %llx/%llx (%s)\n",
1655 (unsigned long long)offset,
1656 (unsigned long long)int128_get64(subregion->size),
1657 subregion->name,
1658 (unsigned long long)other->addr,
1659 (unsigned long long)int128_get64(other->size),
1660 other->name);
1661 #endif
1662 }
1663 QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1664 if (subregion->priority >= other->priority) {
1665 QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1666 goto done;
1667 }
1668 }
1669 QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1670 done:
1671 memory_region_update_pending |= mr->enabled && subregion->enabled;
1672 memory_region_transaction_commit();
1673 }
1674
1675 static void memory_region_add_subregion_common(MemoryRegion *mr,
1676 hwaddr offset,
1677 MemoryRegion *subregion)
1678 {
1679 assert(!subregion->container);
1680 subregion->container = mr;
1681 subregion->addr = offset;
1682 memory_region_update_container_subregions(subregion);
1683 }
1684
1685 void memory_region_add_subregion(MemoryRegion *mr,
1686 hwaddr offset,
1687 MemoryRegion *subregion)
1688 {
1689 subregion->may_overlap = false;
1690 subregion->priority = 0;
1691 memory_region_add_subregion_common(mr, offset, subregion);
1692 }
1693
1694 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1695 hwaddr offset,
1696 MemoryRegion *subregion,
1697 int priority)
1698 {
1699 subregion->may_overlap = true;
1700 subregion->priority = priority;
1701 memory_region_add_subregion_common(mr, offset, subregion);
1702 }
1703
1704 void memory_region_del_subregion(MemoryRegion *mr,
1705 MemoryRegion *subregion)
1706 {
1707 memory_region_transaction_begin();
1708 assert(subregion->container == mr);
1709 subregion->container = NULL;
1710 QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1711 memory_region_unref(subregion);
1712 memory_region_update_pending |= mr->enabled && subregion->enabled;
1713 memory_region_transaction_commit();
1714 }
1715
1716 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1717 {
1718 if (enabled == mr->enabled) {
1719 return;
1720 }
1721 memory_region_transaction_begin();
1722 mr->enabled = enabled;
1723 memory_region_update_pending = true;
1724 memory_region_transaction_commit();
1725 }
1726
1727 void memory_region_set_size(MemoryRegion *mr, uint64_t size)
1728 {
1729 Int128 s = int128_make64(size);
1730
1731 if (size == UINT64_MAX) {
1732 s = int128_2_64();
1733 }
1734 if (int128_eq(s, mr->size)) {
1735 return;
1736 }
1737 memory_region_transaction_begin();
1738 mr->size = s;
1739 memory_region_update_pending = true;
1740 memory_region_transaction_commit();
1741 }
1742
1743 static void memory_region_readd_subregion(MemoryRegion *mr)
1744 {
1745 MemoryRegion *container = mr->container;
1746
1747 if (container) {
1748 memory_region_transaction_begin();
1749 memory_region_ref(mr);
1750 memory_region_del_subregion(container, mr);
1751 mr->container = container;
1752 memory_region_update_container_subregions(mr);
1753 memory_region_unref(mr);
1754 memory_region_transaction_commit();
1755 }
1756 }
1757
1758 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1759 {
1760 if (addr != mr->addr) {
1761 mr->addr = addr;
1762 memory_region_readd_subregion(mr);
1763 }
1764 }
1765
1766 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1767 {
1768 assert(mr->alias);
1769
1770 if (offset == mr->alias_offset) {
1771 return;
1772 }
1773
1774 memory_region_transaction_begin();
1775 mr->alias_offset = offset;
1776 memory_region_update_pending |= mr->enabled;
1777 memory_region_transaction_commit();
1778 }
1779
1780 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1781 {
1782 return mr->ram_addr;
1783 }
1784
1785 uint64_t memory_region_get_alignment(const MemoryRegion *mr)
1786 {
1787 return mr->align;
1788 }
1789
1790 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1791 {
1792 const AddrRange *addr = addr_;
1793 const FlatRange *fr = fr_;
1794
1795 if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1796 return -1;
1797 } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1798 return 1;
1799 }
1800 return 0;
1801 }
1802
1803 static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
1804 {
1805 return bsearch(&addr, view->ranges, view->nr,
1806 sizeof(FlatRange), cmp_flatrange_addr);
1807 }
1808
1809 bool memory_region_present(MemoryRegion *container, hwaddr addr)
1810 {
1811 MemoryRegion *mr = memory_region_find(container, addr, 1).mr;
1812 if (!mr || (mr == container)) {
1813 return false;
1814 }
1815 memory_region_unref(mr);
1816 return true;
1817 }
1818
1819 bool memory_region_is_mapped(MemoryRegion *mr)
1820 {
1821 return mr->container ? true : false;
1822 }
1823
1824 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1825 hwaddr addr, uint64_t size)
1826 {
1827 MemoryRegionSection ret = { .mr = NULL };
1828 MemoryRegion *root;
1829 AddressSpace *as;
1830 AddrRange range;
1831 FlatView *view;
1832 FlatRange *fr;
1833
1834 addr += mr->addr;
1835 for (root = mr; root->container; ) {
1836 root = root->container;
1837 addr += root->addr;
1838 }
1839
1840 as = memory_region_to_address_space(root);
1841 if (!as) {
1842 return ret;
1843 }
1844 range = addrrange_make(int128_make64(addr), int128_make64(size));
1845
1846 view = address_space_get_flatview(as);
1847 fr = flatview_lookup(view, range);
1848 if (!fr) {
1849 flatview_unref(view);
1850 return ret;
1851 }
1852
1853 while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
1854 --fr;
1855 }
1856
1857 ret.mr = fr->mr;
1858 ret.address_space = as;
1859 range = addrrange_intersection(range, fr->addr);
1860 ret.offset_within_region = fr->offset_in_region;
1861 ret.offset_within_region += int128_get64(int128_sub(range.start,
1862 fr->addr.start));
1863 ret.size = range.size;
1864 ret.offset_within_address_space = int128_get64(range.start);
1865 ret.readonly = fr->readonly;
1866 memory_region_ref(ret.mr);
1867
1868 flatview_unref(view);
1869 return ret;
1870 }
1871
1872 void address_space_sync_dirty_bitmap(AddressSpace *as)
1873 {
1874 FlatView *view;
1875 FlatRange *fr;
1876
1877 view = address_space_get_flatview(as);
1878 FOR_EACH_FLAT_RANGE(fr, view) {
1879 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1880 }
1881 flatview_unref(view);
1882 }
1883
1884 void memory_global_dirty_log_start(void)
1885 {
1886 global_dirty_log = true;
1887 MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1888 }
1889
1890 void memory_global_dirty_log_stop(void)
1891 {
1892 global_dirty_log = false;
1893 MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1894 }
1895
1896 static void listener_add_address_space(MemoryListener *listener,
1897 AddressSpace *as)
1898 {
1899 FlatView *view;
1900 FlatRange *fr;
1901
1902 if (listener->address_space_filter
1903 && listener->address_space_filter != as) {
1904 return;
1905 }
1906
1907 if (global_dirty_log) {
1908 if (listener->log_global_start) {
1909 listener->log_global_start(listener);
1910 }
1911 }
1912
1913 view = address_space_get_flatview(as);
1914 FOR_EACH_FLAT_RANGE(fr, view) {
1915 MemoryRegionSection section = {
1916 .mr = fr->mr,
1917 .address_space = as,
1918 .offset_within_region = fr->offset_in_region,
1919 .size = fr->addr.size,
1920 .offset_within_address_space = int128_get64(fr->addr.start),
1921 .readonly = fr->readonly,
1922 };
1923 if (listener->region_add) {
1924 listener->region_add(listener, &section);
1925 }
1926 }
1927 flatview_unref(view);
1928 }
1929
1930 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
1931 {
1932 MemoryListener *other = NULL;
1933 AddressSpace *as;
1934
1935 listener->address_space_filter = filter;
1936 if (QTAILQ_EMPTY(&memory_listeners)
1937 || listener->priority >= QTAILQ_LAST(&memory_listeners,
1938 memory_listeners)->priority) {
1939 QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1940 } else {
1941 QTAILQ_FOREACH(other, &memory_listeners, link) {
1942 if (listener->priority < other->priority) {
1943 break;
1944 }
1945 }
1946 QTAILQ_INSERT_BEFORE(other, listener, link);
1947 }
1948
1949 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1950 listener_add_address_space(listener, as);
1951 }
1952 }
1953
1954 void memory_listener_unregister(MemoryListener *listener)
1955 {
1956 QTAILQ_REMOVE(&memory_listeners, listener, link);
1957 }
1958
1959 void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
1960 {
1961 if (QTAILQ_EMPTY(&address_spaces)) {
1962 memory_init();
1963 }
1964
1965 memory_region_transaction_begin();
1966 as->root = root;
1967 as->current_map = g_new(FlatView, 1);
1968 flatview_init(as->current_map);
1969 as->ioeventfd_nb = 0;
1970 as->ioeventfds = NULL;
1971 QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
1972 as->name = g_strdup(name ? name : "anonymous");
1973 address_space_init_dispatch(as);
1974 memory_region_update_pending |= root->enabled;
1975 memory_region_transaction_commit();
1976 }
1977
1978 void address_space_destroy(AddressSpace *as)
1979 {
1980 MemoryListener *listener;
1981
1982 /* Flush out anything from MemoryListeners listening in on this */
1983 memory_region_transaction_begin();
1984 as->root = NULL;
1985 memory_region_transaction_commit();
1986 QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
1987 address_space_destroy_dispatch(as);
1988
1989 QTAILQ_FOREACH(listener, &memory_listeners, link) {
1990 assert(listener->address_space_filter != as);
1991 }
1992
1993 flatview_unref(as->current_map);
1994 g_free(as->name);
1995 g_free(as->ioeventfds);
1996 }
1997
1998 bool io_mem_read(MemoryRegion *mr, hwaddr addr, uint64_t *pval, unsigned size)
1999 {
2000 return memory_region_dispatch_read(mr, addr, pval, size);
2001 }
2002
2003 bool io_mem_write(MemoryRegion *mr, hwaddr addr,
2004 uint64_t val, unsigned size)
2005 {
2006 return memory_region_dispatch_write(mr, addr, val, size);
2007 }
2008
2009 typedef struct MemoryRegionList MemoryRegionList;
2010
2011 struct MemoryRegionList {
2012 const MemoryRegion *mr;
2013 QTAILQ_ENTRY(MemoryRegionList) queue;
2014 };
2015
2016 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
2017
2018 static void mtree_print_mr(fprintf_function mon_printf, void *f,
2019 const MemoryRegion *mr, unsigned int level,
2020 hwaddr base,
2021 MemoryRegionListHead *alias_print_queue)
2022 {
2023 MemoryRegionList *new_ml, *ml, *next_ml;
2024 MemoryRegionListHead submr_print_queue;
2025 const MemoryRegion *submr;
2026 unsigned int i;
2027
2028 if (!mr || !mr->enabled) {
2029 return;
2030 }
2031
2032 for (i = 0; i < level; i++) {
2033 mon_printf(f, " ");
2034 }
2035
2036 if (mr->alias) {
2037 MemoryRegionList *ml;
2038 bool found = false;
2039
2040 /* check if the alias is already in the queue */
2041 QTAILQ_FOREACH(ml, alias_print_queue, queue) {
2042 if (ml->mr == mr->alias) {
2043 found = true;
2044 }
2045 }
2046
2047 if (!found) {
2048 ml = g_new(MemoryRegionList, 1);
2049 ml->mr = mr->alias;
2050 QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
2051 }
2052 mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
2053 " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
2054 "-" TARGET_FMT_plx "\n",
2055 base + mr->addr,
2056 base + mr->addr
2057 + (int128_nz(mr->size) ?
2058 (hwaddr)int128_get64(int128_sub(mr->size,
2059 int128_one())) : 0),
2060 mr->priority,
2061 mr->romd_mode ? 'R' : '-',
2062 !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2063 : '-',
2064 memory_region_name(mr),
2065 memory_region_name(mr->alias),
2066 mr->alias_offset,
2067 mr->alias_offset
2068 + (int128_nz(mr->size) ?
2069 (hwaddr)int128_get64(int128_sub(mr->size,
2070 int128_one())) : 0));
2071 } else {
2072 mon_printf(f,
2073 TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
2074 base + mr->addr,
2075 base + mr->addr
2076 + (int128_nz(mr->size) ?
2077 (hwaddr)int128_get64(int128_sub(mr->size,
2078 int128_one())) : 0),
2079 mr->priority,
2080 mr->romd_mode ? 'R' : '-',
2081 !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2082 : '-',
2083 memory_region_name(mr));
2084 }
2085
2086 QTAILQ_INIT(&submr_print_queue);
2087
2088 QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
2089 new_ml = g_new(MemoryRegionList, 1);
2090 new_ml->mr = submr;
2091 QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2092 if (new_ml->mr->addr < ml->mr->addr ||
2093 (new_ml->mr->addr == ml->mr->addr &&
2094 new_ml->mr->priority > ml->mr->priority)) {
2095 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
2096 new_ml = NULL;
2097 break;
2098 }
2099 }
2100 if (new_ml) {
2101 QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
2102 }
2103 }
2104
2105 QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2106 mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
2107 alias_print_queue);
2108 }
2109
2110 QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
2111 g_free(ml);
2112 }
2113 }
2114
2115 void mtree_info(fprintf_function mon_printf, void *f)
2116 {
2117 MemoryRegionListHead ml_head;
2118 MemoryRegionList *ml, *ml2;
2119 AddressSpace *as;
2120
2121 QTAILQ_INIT(&ml_head);
2122
2123 QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2124 mon_printf(f, "%s\n", as->name);
2125 mtree_print_mr(mon_printf, f, as->root, 0, 0, &ml_head);
2126 }
2127
2128 mon_printf(f, "aliases\n");
2129 /* print aliased regions */
2130 QTAILQ_FOREACH(ml, &ml_head, queue) {
2131 mon_printf(f, "%s\n", memory_region_name(ml->mr));
2132 mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
2133 }
2134
2135 QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
2136 g_free(ml);
2137 }
2138 }
2139
2140 static const TypeInfo memory_region_info = {
2141 .parent = TYPE_OBJECT,
2142 .name = TYPE_MEMORY_REGION,
2143 .instance_size = sizeof(MemoryRegion),
2144 .instance_init = memory_region_initfn,
2145 .instance_finalize = memory_region_finalize,
2146 };
2147
2148 static void memory_register_types(void)
2149 {
2150 type_register_static(&memory_region_info);
2151 }
2152
2153 type_init(memory_register_types)
QEmu