memory.c

   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 #define RAM_ADDR_INVALID (~(ram_addr_t)0)
  32
  33 static unsigned memory_region_transaction_depth;
  34 static bool memory_region_update_pending;
  35 static bool ioeventfd_update_pending;
  36 static bool global_dirty_log = false;
  37
  38 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  39     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  40
  41 static QTAILQ_HEAD(, AddressSpace) address_spaces
  42     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  43
  44 typedef struct AddrRange AddrRange;
  45
  46 /*
  47  * Note that signed integers are needed for negative offsetting in aliases
  48  * (large MemoryRegion::alias_offset).
  49  */
  50 struct AddrRange {
  51     Int128 start;
  52     Int128 size;
  53 };
  54
  55 static AddrRange addrrange_make(Int128 start, Int128 size)
  56 {
  57     return (AddrRange) { start, size };
  58 }
  59
  60 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  61 {
  62     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  63 }
  64
  65 static Int128 addrrange_end(AddrRange r)
  66 {
  67     return int128_add(r.start, r.size);
  68 }
  69
  70 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  71 {
  72     int128_addto(&range.start, delta);
  73     return range;
  74 }
  75
  76 static bool addrrange_contains(AddrRange range, Int128 addr)
  77 {
  78     return int128_ge(addr, range.start)
  79         && int128_lt(addr, addrrange_end(range));
  80 }
  81
  82 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  83 {
  84     return addrrange_contains(r1, r2.start)
  85         || addrrange_contains(r2, r1.start);
  86 }
  87
  88 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  89 {
  90     Int128 start = int128_max(r1.start, r2.start);
  91     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  92     return addrrange_make(start, int128_sub(end, start));
  93 }
  94
  95 enum ListenerDirection { Forward, Reverse };
  96
  97 static bool memory_listener_match(MemoryListener *listener,
  98                                   MemoryRegionSection *section)
  99 {
 100     return !listener->address_space_filter
 101         || listener->address_space_filter == section->address_space;
 102 }
 103
 104 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
 105     do {                                                                \
 106         MemoryListener *_listener;                                      \
 107                                                                         \
 108         switch (_direction) {                                           \
 109         case Forward:                                                   \
 110             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 111                 if (_listener->_callback) {                             \
 112                     _listener->_callback(_listener, ##_args);           \
 113                 }                                                       \
 114             }                                                           \
 115             break;                                                      \
 116         case Reverse:                                                   \
 117             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 118                                    memory_listeners, link) {            \
 119                 if (_listener->_callback) {                             \
 120                     _listener->_callback(_listener, ##_args);           \
 121                 }                                                       \
 122             }                                                           \
 123             break;                                                      \
 124         default:                                                        \
 125             abort();                                                    \
 126         }                                                               \
 127     } while (0)
 128
 129 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 130     do {                                                                \
 131         MemoryListener *_listener;                                      \
 132                                                                         \
 133         switch (_direction) {                                           \
 134         case Forward:                                                   \
 135             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 136                 if (_listener->_callback                                \
 137                     && memory_listener_match(_listener, _section)) {    \
 138                     _listener->_callback(_listener, _section, ##_args); \
 139                 }                                                       \
 140             }                                                           \
 141             break;                                                      \
 142         case Reverse:                                                   \
 143             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 144                                    memory_listeners, link) {            \
 145                 if (_listener->_callback                                \
 146                     && memory_listener_match(_listener, _section)) {    \
 147                     _listener->_callback(_listener, _section, ##_args); \
 148                 }                                                       \
 149             }                                                           \
 150             break;                                                      \
 151         default:                                                        \
 152             abort();                                                    \
 153         }                                                               \
 154     } while (0)
 155
 156 /* No need to ref/unref .mr, the FlatRange keeps it alive.  */
 157 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...)  \
 158     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 159         .mr = (fr)->mr,                                                 \
 160         .address_space = (as),                                          \
 161         .offset_within_region = (fr)->offset_in_region,                 \
 162         .size = (fr)->addr.size,                                        \
 163         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 164         .readonly = (fr)->readonly,                                     \
 165               }), ##_args)
 166
 167 struct CoalescedMemoryRange {
 168     AddrRange addr;
 169     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 170 };
 171
 172 struct MemoryRegionIoeventfd {
 173     AddrRange addr;
 174     bool match_data;
 175     uint64_t data;
 176     EventNotifier *e;
 177 };
 178
 179 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 180                                            MemoryRegionIoeventfd b)
 181 {
 182     if (int128_lt(a.addr.start, b.addr.start)) {
 183         return true;
 184     } else if (int128_gt(a.addr.start, b.addr.start)) {
 185         return false;
 186     } else if (int128_lt(a.addr.size, b.addr.size)) {
 187         return true;
 188     } else if (int128_gt(a.addr.size, b.addr.size)) {
 189         return false;
 190     } else if (a.match_data < b.match_data) {
 191         return true;
 192     } else  if (a.match_data > b.match_data) {
 193         return false;
 194     } else if (a.match_data) {
 195         if (a.data < b.data) {
 196             return true;
 197         } else if (a.data > b.data) {
 198             return false;
 199         }
 200     }
 201     if (a.e < b.e) {
 202         return true;
 203     } else if (a.e > b.e) {
 204         return false;
 205     }
 206     return false;
 207 }
 208
 209 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 210                                           MemoryRegionIoeventfd b)
 211 {
 212     return !memory_region_ioeventfd_before(a, b)
 213         && !memory_region_ioeventfd_before(b, a);
 214 }
 215
 216 typedef struct FlatRange FlatRange;
 217 typedef struct FlatView FlatView;
 218
 219 /* Range of memory in the global map.  Addresses are absolute. */
 220 struct FlatRange {
 221     MemoryRegion *mr;
 222     hwaddr offset_in_region;
 223     AddrRange addr;
 224     uint8_t dirty_log_mask;
 225     bool romd_mode;
 226     bool readonly;
 227 };
 228
 229 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 230  * order.
 231  */
 232 struct FlatView {
 233     struct rcu_head rcu;
 234     unsigned ref;
 235     FlatRange *ranges;
 236     unsigned nr;
 237     unsigned nr_allocated;
 238 };
 239
 240 typedef struct AddressSpaceOps AddressSpaceOps;
 241
 242 #define FOR_EACH_FLAT_RANGE(var, view)          \
 243     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 244
 245 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 246 {
 247     return a->mr == b->mr
 248         && addrrange_equal(a->addr, b->addr)
 249         && a->offset_in_region == b->offset_in_region
 250         && a->romd_mode == b->romd_mode
 251         && a->readonly == b->readonly;
 252 }
 253
 254 static void flatview_init(FlatView *view)
 255 {
 256     view->ref = 1;
 257     view->ranges = NULL;
 258     view->nr = 0;
 259     view->nr_allocated = 0;
 260 }
 261
 262 /* Insert a range into a given position.  Caller is responsible for maintaining
 263  * sorting order.
 264  */
 265 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 266 {
 267     if (view->nr == view->nr_allocated) {
 268         view->nr_allocated = MAX(2 * view->nr, 10);
 269         view->ranges = g_realloc(view->ranges,
 270                                     view->nr_allocated * sizeof(*view->ranges));
 271     }
 272     memmove(view->ranges + pos + 1, view->ranges + pos,
 273             (view->nr - pos) * sizeof(FlatRange));
 274     view->ranges[pos] = *range;
 275     memory_region_ref(range->mr);
 276     ++view->nr;
 277 }
 278
 279 static void flatview_destroy(FlatView *view)
 280 {
 281     int i;
 282
 283     for (i = 0; i < view->nr; i++) {
 284         memory_region_unref(view->ranges[i].mr);
 285     }
 286     g_free(view->ranges);
 287     g_free(view);
 288 }
 289
 290 static void flatview_ref(FlatView *view)
 291 {
 292     atomic_inc(&view->ref);
 293 }
 294
 295 static void flatview_unref(FlatView *view)
 296 {
 297     if (atomic_fetch_dec(&view->ref) == 1) {
 298         flatview_destroy(view);
 299     }
 300 }
 301
 302 static bool can_merge(FlatRange *r1, FlatRange *r2)
 303 {
 304     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 305         && r1->mr == r2->mr
 306         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 307                                 r1->addr.size),
 308                      int128_make64(r2->offset_in_region))
 309         && r1->dirty_log_mask == r2->dirty_log_mask
 310         && r1->romd_mode == r2->romd_mode
 311         && r1->readonly == r2->readonly;
 312 }
 313
 314 /* Attempt to simplify a view by merging adjacent ranges */
 315 static void flatview_simplify(FlatView *view)
 316 {
 317     unsigned i, j;
 318
 319     i = 0;
 320     while (i < view->nr) {
 321         j = i + 1;
 322         while (j < view->nr
 323                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 324             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 325             ++j;
 326         }
 327         ++i;
 328         memmove(&view->ranges[i], &view->ranges[j],
 329                 (view->nr - j) * sizeof(view->ranges[j]));
 330         view->nr -= j - i;
 331     }
 332 }
 333
 334 static bool memory_region_big_endian(MemoryRegion *mr)
 335 {
 336 #ifdef TARGET_WORDS_BIGENDIAN
 337     return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
 338 #else
 339     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 340 #endif
 341 }
 342
 343 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 344 {
 345 #ifdef TARGET_WORDS_BIGENDIAN
 346     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 347 #else
 348     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 349 #endif
 350 }
 351
 352 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 353 {
 354     if (memory_region_wrong_endianness(mr)) {
 355         switch (size) {
 356         case 1:
 357             break;
 358         case 2:
 359             *data = bswap16(*data);
 360             break;
 361         case 4:
 362             *data = bswap32(*data);
 363             break;
 364         case 8:
 365             *data = bswap64(*data);
 366             break;
 367         default:
 368             abort();
 369         }
 370     }
 371 }
 372
 373 static MemTxResult memory_region_oldmmio_read_accessor(MemoryRegion *mr,
 374                                                        hwaddr addr,
 375                                                        uint64_t *value,
 376                                                        unsigned size,
 377                                                        unsigned shift,
 378                                                        uint64_t mask,
 379                                                        MemTxAttrs attrs)
 380 {
 381     uint64_t tmp;
 382
 383     tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
 384     trace_memory_region_ops_read(mr, addr, tmp, size);
 385     *value |= (tmp & mask) << shift;
 386     return MEMTX_OK;
 387 }
 388
 389 static MemTxResult  memory_region_read_accessor(MemoryRegion *mr,
 390                                                 hwaddr addr,
 391                                                 uint64_t *value,
 392                                                 unsigned size,
 393                                                 unsigned shift,
 394                                                 uint64_t mask,
 395                                                 MemTxAttrs attrs)
 396 {
 397     uint64_t tmp;
 398
 399     tmp = mr->ops->read(mr->opaque, addr, size);
 400     trace_memory_region_ops_read(mr, addr, tmp, size);
 401     *value |= (tmp & mask) << shift;
 402     return MEMTX_OK;
 403 }
 404
 405 static MemTxResult memory_region_read_with_attrs_accessor(MemoryRegion *mr,
 406                                                           hwaddr addr,
 407                                                           uint64_t *value,
 408                                                           unsigned size,
 409                                                           unsigned shift,
 410                                                           uint64_t mask,
 411                                                           MemTxAttrs attrs)
 412 {
 413     uint64_t tmp = 0;
 414     MemTxResult r;
 415
 416     r = mr->ops->read_with_attrs(mr->opaque, addr, &tmp, size, attrs);
 417     trace_memory_region_ops_read(mr, addr, tmp, size);
 418     *value |= (tmp & mask) << shift;
 419     return r;
 420 }
 421
 422 static MemTxResult memory_region_oldmmio_write_accessor(MemoryRegion *mr,
 423                                                         hwaddr addr,
 424                                                         uint64_t *value,
 425                                                         unsigned size,
 426                                                         unsigned shift,
 427                                                         uint64_t mask,
 428                                                         MemTxAttrs attrs)
 429 {
 430     uint64_t tmp;
 431
 432     tmp = (*value >> shift) & mask;
 433     trace_memory_region_ops_write(mr, addr, tmp, size);
 434     mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
 435     return MEMTX_OK;
 436 }
 437
 438 static MemTxResult memory_region_write_accessor(MemoryRegion *mr,
 439                                                 hwaddr addr,
 440                                                 uint64_t *value,
 441                                                 unsigned size,
 442                                                 unsigned shift,
 443                                                 uint64_t mask,
 444                                                 MemTxAttrs attrs)
 445 {
 446     uint64_t tmp;
 447
 448     tmp = (*value >> shift) & mask;
 449     trace_memory_region_ops_write(mr, addr, tmp, size);
 450     mr->ops->write(mr->opaque, addr, tmp, size);
 451     return MEMTX_OK;
 452 }
 453
 454 static MemTxResult memory_region_write_with_attrs_accessor(MemoryRegion *mr,
 455                                                            hwaddr addr,
 456                                                            uint64_t *value,
 457                                                            unsigned size,
 458                                                            unsigned shift,
 459                                                            uint64_t mask,
 460                                                            MemTxAttrs attrs)
 461 {
 462     uint64_t tmp;
 463
 464     tmp = (*value >> shift) & mask;
 465     trace_memory_region_ops_write(mr, addr, tmp, size);
 466     return mr->ops->write_with_attrs(mr->opaque, addr, tmp, size, attrs);
 467 }
 468
 469 static MemTxResult access_with_adjusted_size(hwaddr addr,
 470                                       uint64_t *value,
 471                                       unsigned size,
 472                                       unsigned access_size_min,
 473                                       unsigned access_size_max,
 474                                       MemTxResult (*access)(MemoryRegion *mr,
 475                                                             hwaddr addr,
 476                                                             uint64_t *value,
 477                                                             unsigned size,
 478                                                             unsigned shift,
 479                                                             uint64_t mask,
 480                                                             MemTxAttrs attrs),
 481                                       MemoryRegion *mr,
 482                                       MemTxAttrs attrs)
 483 {
 484     uint64_t access_mask;
 485     unsigned access_size;
 486     unsigned i;
 487     MemTxResult r = MEMTX_OK;
 488
 489     if (!access_size_min) {
 490         access_size_min = 1;
 491     }
 492     if (!access_size_max) {
 493         access_size_max = 4;
 494     }
 495
 496     /* FIXME: support unaligned access? */
 497     access_size = MAX(MIN(size, access_size_max), access_size_min);
 498     access_mask = -1ULL >> (64 - access_size * 8);
 499     if (memory_region_big_endian(mr)) {
 500         for (i = 0; i < size; i += access_size) {
 501             r |= access(mr, addr + i, value, access_size,
 502                         (size - access_size - i) * 8, access_mask, attrs);
 503         }
 504     } else {
 505         for (i = 0; i < size; i += access_size) {
 506             r |= access(mr, addr + i, value, access_size, i * 8,
 507                         access_mask, attrs);
 508         }
 509     }
 510     return r;
 511 }
 512
 513 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 514 {
 515     AddressSpace *as;
 516
 517     while (mr->container) {
 518         mr = mr->container;
 519     }
 520     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 521         if (mr == as->root) {
 522             return as;
 523         }
 524     }
 525     return NULL;
 526 }
 527
 528 /* Render a memory region into the global view.  Ranges in @view obscure
 529  * ranges in @mr.
 530  */
 531 static void render_memory_region(FlatView *view,
 532                                  MemoryRegion *mr,
 533                                  Int128 base,
 534                                  AddrRange clip,
 535                                  bool readonly)
 536 {
 537     MemoryRegion *subregion;
 538     unsigned i;
 539     hwaddr offset_in_region;
 540     Int128 remain;
 541     Int128 now;
 542     FlatRange fr;
 543     AddrRange tmp;
 544
 545     if (!mr->enabled) {
 546         return;
 547     }
 548
 549     int128_addto(&base, int128_make64(mr->addr));
 550     readonly |= mr->readonly;
 551
 552     tmp = addrrange_make(base, mr->size);
 553
 554     if (!addrrange_intersects(tmp, clip)) {
 555         return;
 556     }
 557
 558     clip = addrrange_intersection(tmp, clip);
 559
 560     if (mr->alias) {
 561         int128_subfrom(&base, int128_make64(mr->alias->addr));
 562         int128_subfrom(&base, int128_make64(mr->alias_offset));
 563         render_memory_region(view, mr->alias, base, clip, readonly);
 564         return;
 565     }
 566
 567     /* Render subregions in priority order. */
 568     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 569         render_memory_region(view, subregion, base, clip, readonly);
 570     }
 571
 572     if (!mr->terminates) {
 573         return;
 574     }
 575
 576     offset_in_region = int128_get64(int128_sub(clip.start, base));
 577     base = clip.start;
 578     remain = clip.size;
 579
 580     fr.mr = mr;
 581     fr.dirty_log_mask = memory_region_get_dirty_log_mask(mr);
 582     fr.romd_mode = mr->romd_mode;
 583     fr.readonly = readonly;
 584
 585     /* Render the region itself into any gaps left by the current view. */
 586     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 587         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 588             continue;
 589         }
 590         if (int128_lt(base, view->ranges[i].addr.start)) {
 591             now = int128_min(remain,
 592                              int128_sub(view->ranges[i].addr.start, base));
 593             fr.offset_in_region = offset_in_region;
 594             fr.addr = addrrange_make(base, now);
 595             flatview_insert(view, i, &fr);
 596             ++i;
 597             int128_addto(&base, now);
 598             offset_in_region += int128_get64(now);
 599             int128_subfrom(&remain, now);
 600         }
 601         now = int128_sub(int128_min(int128_add(base, remain),
 602                                     addrrange_end(view->ranges[i].addr)),
 603                          base);
 604         int128_addto(&base, now);
 605         offset_in_region += int128_get64(now);
 606         int128_subfrom(&remain, now);
 607     }
 608     if (int128_nz(remain)) {
 609         fr.offset_in_region = offset_in_region;
 610         fr.addr = addrrange_make(base, remain);
 611         flatview_insert(view, i, &fr);
 612     }
 613 }
 614
 615 /* Render a memory topology into a list of disjoint absolute ranges. */
 616 static FlatView *generate_memory_topology(MemoryRegion *mr)
 617 {
 618     FlatView *view;
 619
 620     view = g_new(FlatView, 1);
 621     flatview_init(view);
 622
 623     if (mr) {
 624         render_memory_region(view, mr, int128_zero(),
 625                              addrrange_make(int128_zero(), int128_2_64()), false);
 626     }
 627     flatview_simplify(view);
 628
 629     return view;
 630 }
 631
 632 static void address_space_add_del_ioeventfds(AddressSpace *as,
 633                                              MemoryRegionIoeventfd *fds_new,
 634                                              unsigned fds_new_nb,
 635                                              MemoryRegionIoeventfd *fds_old,
 636                                              unsigned fds_old_nb)
 637 {
 638     unsigned iold, inew;
 639     MemoryRegionIoeventfd *fd;
 640     MemoryRegionSection section;
 641
 642     /* Generate a symmetric difference of the old and new fd sets, adding
 643      * and deleting as necessary.
 644      */
 645
 646     iold = inew = 0;
 647     while (iold < fds_old_nb || inew < fds_new_nb) {
 648         if (iold < fds_old_nb
 649             && (inew == fds_new_nb
 650                 || memory_region_ioeventfd_before(fds_old[iold],
 651                                                   fds_new[inew]))) {
 652             fd = &fds_old[iold];
 653             section = (MemoryRegionSection) {
 654                 .address_space = as,
 655                 .offset_within_address_space = int128_get64(fd->addr.start),
 656                 .size = fd->addr.size,
 657             };
 658             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 659                                  fd->match_data, fd->data, fd->e);
 660             ++iold;
 661         } else if (inew < fds_new_nb
 662                    && (iold == fds_old_nb
 663                        || memory_region_ioeventfd_before(fds_new[inew],
 664                                                          fds_old[iold]))) {
 665             fd = &fds_new[inew];
 666             section = (MemoryRegionSection) {
 667                 .address_space = as,
 668                 .offset_within_address_space = int128_get64(fd->addr.start),
 669                 .size = fd->addr.size,
 670             };
 671             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 672                                  fd->match_data, fd->data, fd->e);
 673             ++inew;
 674         } else {
 675             ++iold;
 676             ++inew;
 677         }
 678     }
 679 }
 680
 681 static FlatView *address_space_get_flatview(AddressSpace *as)
 682 {
 683     FlatView *view;
 684
 685     rcu_read_lock();
 686     view = atomic_rcu_read(&as->current_map);
 687     flatview_ref(view);
 688     rcu_read_unlock();
 689     return view;
 690 }
 691
 692 static void address_space_update_ioeventfds(AddressSpace *as)
 693 {
 694     FlatView *view;
 695     FlatRange *fr;
 696     unsigned ioeventfd_nb = 0;
 697     MemoryRegionIoeventfd *ioeventfds = NULL;
 698     AddrRange tmp;
 699     unsigned i;
 700
 701     view = address_space_get_flatview(as);
 702     FOR_EACH_FLAT_RANGE(fr, view) {
 703         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 704             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 705                                   int128_sub(fr->addr.start,
 706                                              int128_make64(fr->offset_in_region)));
 707             if (addrrange_intersects(fr->addr, tmp)) {
 708                 ++ioeventfd_nb;
 709                 ioeventfds = g_realloc(ioeventfds,
 710                                           ioeventfd_nb * sizeof(*ioeventfds));
 711                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 712                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 713             }
 714         }
 715     }
 716
 717     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 718                                      as->ioeventfds, as->ioeventfd_nb);
 719
 720     g_free(as->ioeventfds);
 721     as->ioeventfds = ioeventfds;
 722     as->ioeventfd_nb = ioeventfd_nb;
 723     flatview_unref(view);
 724 }
 725
 726 static void address_space_update_topology_pass(AddressSpace *as,
 727                                                const FlatView *old_view,
 728                                                const FlatView *new_view,
 729                                                bool adding)
 730 {
 731     unsigned iold, inew;
 732     FlatRange *frold, *frnew;
 733
 734     /* Generate a symmetric difference of the old and new memory maps.
 735      * Kill ranges in the old map, and instantiate ranges in the new map.
 736      */
 737     iold = inew = 0;
 738     while (iold < old_view->nr || inew < new_view->nr) {
 739         if (iold < old_view->nr) {
 740             frold = &old_view->ranges[iold];
 741         } else {
 742             frold = NULL;
 743         }
 744         if (inew < new_view->nr) {
 745             frnew = &new_view->ranges[inew];
 746         } else {
 747             frnew = NULL;
 748         }
 749
 750         if (frold
 751             && (!frnew
 752                 || int128_lt(frold->addr.start, frnew->addr.start)
 753                 || (int128_eq(frold->addr.start, frnew->addr.start)
 754                     && !flatrange_equal(frold, frnew)))) {
 755             /* In old but not in new, or in both but attributes changed. */
 756
 757             if (!adding) {
 758                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 759             }
 760
 761             ++iold;
 762         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 763             /* In both and unchanged (except logging may have changed) */
 764
 765             if (adding) {
 766                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 767                 if (frnew->dirty_log_mask & ~frold->dirty_log_mask) {
 768                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start,
 769                                                   frold->dirty_log_mask,
 770                                                   frnew->dirty_log_mask);
 771                 }
 772                 if (frold->dirty_log_mask & ~frnew->dirty_log_mask) {
 773                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop,
 774                                                   frold->dirty_log_mask,
 775                                                   frnew->dirty_log_mask);
 776                 }
 777             }
 778
 779             ++iold;
 780             ++inew;
 781         } else {
 782             /* In new */
 783
 784             if (adding) {
 785                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 786             }
 787
 788             ++inew;
 789         }
 790     }
 791 }
 792
 793
 794 static void address_space_update_topology(AddressSpace *as)
 795 {
 796     FlatView *old_view = address_space_get_flatview(as);
 797     FlatView *new_view = generate_memory_topology(as->root);
 798
 799     address_space_update_topology_pass(as, old_view, new_view, false);
 800     address_space_update_topology_pass(as, old_view, new_view, true);
 801
 802     /* Writes are protected by the BQL.  */
 803     atomic_rcu_set(&as->current_map, new_view);
 804     call_rcu(old_view, flatview_unref, rcu);
 805
 806     /* Note that all the old MemoryRegions are still alive up to this
 807      * point.  This relieves most MemoryListeners from the need to
 808      * ref/unref the MemoryRegions they get---unless they use them
 809      * outside the iothread mutex, in which case precise reference
 810      * counting is necessary.
 811      */
 812     flatview_unref(old_view);
 813
 814     address_space_update_ioeventfds(as);
 815 }
 816
 817 void memory_region_transaction_begin(void)
 818 {
 819     qemu_flush_coalesced_mmio_buffer();
 820     ++memory_region_transaction_depth;
 821 }
 822
 823 static void memory_region_clear_pending(void)
 824 {
 825     memory_region_update_pending = false;
 826     ioeventfd_update_pending = false;
 827 }
 828
 829 void memory_region_transaction_commit(void)
 830 {
 831     AddressSpace *as;
 832
 833     assert(memory_region_transaction_depth);
 834     --memory_region_transaction_depth;
 835     if (!memory_region_transaction_depth) {
 836         if (memory_region_update_pending) {
 837             MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 838
 839             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 840                 address_space_update_topology(as);
 841             }
 842
 843             MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 844         } else if (ioeventfd_update_pending) {
 845             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 846                 address_space_update_ioeventfds(as);
 847             }
 848         }
 849         memory_region_clear_pending();
 850    }
 851 }
 852
 853 static void memory_region_destructor_none(MemoryRegion *mr)
 854 {
 855 }
 856
 857 static void memory_region_destructor_ram(MemoryRegion *mr)
 858 {
 859     qemu_ram_free(mr->ram_addr);
 860 }
 861
 862 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 863 {
 864     qemu_ram_free_from_ptr(mr->ram_addr);
 865 }
 866
 867 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 868 {
 869     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 870 }
 871
 872 static bool memory_region_need_escape(char c)
 873 {
 874     return c == '/' || c == '[' || c == '\\' || c == ']';
 875 }
 876
 877 static char *memory_region_escape_name(const char *name)
 878 {
 879     const char *p;
 880     char *escaped, *q;
 881     uint8_t c;
 882     size_t bytes = 0;
 883
 884     for (p = name; *p; p++) {
 885         bytes += memory_region_need_escape(*p) ? 4 : 1;
 886     }
 887     if (bytes == p - name) {
 888        return g_memdup(name, bytes + 1);
 889     }
 890
 891     escaped = g_malloc(bytes + 1);
 892     for (p = name, q = escaped; *p; p++) {
 893         c = *p;
 894         if (unlikely(memory_region_need_escape(c))) {
 895             *q++ = '\\';
 896             *q++ = 'x';
 897             *q++ = "0123456789abcdef"[c >> 4];
 898             c = "0123456789abcdef"[c & 15];
 899         }
 900         *q++ = c;
 901     }
 902     *q = 0;
 903     return escaped;
 904 }
 905
 906 void memory_region_init(MemoryRegion *mr,
 907                         Object *owner,
 908                         const char *name,
 909                         uint64_t size)
 910 {
 911     if (!owner) {
 912         owner = container_get(qdev_get_machine(), "/unattached");
 913     }
 914
 915     object_initialize(mr, sizeof(*mr), TYPE_MEMORY_REGION);
 916     mr->size = int128_make64(size);
 917     if (size == UINT64_MAX) {
 918         mr->size = int128_2_64();
 919     }
 920     mr->name = g_strdup(name);
 921
 922     if (name) {
 923         char *escaped_name = memory_region_escape_name(name);
 924         char *name_array = g_strdup_printf("%s[*]", escaped_name);
 925         object_property_add_child(owner, name_array, OBJECT(mr), &error_abort);
 926         object_unref(OBJECT(mr));
 927         g_free(name_array);
 928         g_free(escaped_name);
 929     }
 930 }
 931
 932 static void memory_region_get_addr(Object *obj, Visitor *v, void *opaque,
 933                                    const char *name, Error **errp)
 934 {
 935     MemoryRegion *mr = MEMORY_REGION(obj);
 936     uint64_t value = mr->addr;
 937
 938     visit_type_uint64(v, &value, name, errp);
 939 }
 940
 941 static void memory_region_get_container(Object *obj, Visitor *v, void *opaque,
 942                                         const char *name, Error **errp)
 943 {
 944     MemoryRegion *mr = MEMORY_REGION(obj);
 945     gchar *path = (gchar *)"";
 946
 947     if (mr->container) {
 948         path = object_get_canonical_path(OBJECT(mr->container));
 949     }
 950     visit_type_str(v, &path, name, errp);
 951     if (mr->container) {
 952         g_free(path);
 953     }
 954 }
 955
 956 static Object *memory_region_resolve_container(Object *obj, void *opaque,
 957                                                const char *part)
 958 {
 959     MemoryRegion *mr = MEMORY_REGION(obj);
 960
 961     return OBJECT(mr->container);
 962 }
 963
 964 static void memory_region_get_priority(Object *obj, Visitor *v, void *opaque,
 965                                        const char *name, Error **errp)
 966 {
 967     MemoryRegion *mr = MEMORY_REGION(obj);
 968     int32_t value = mr->priority;
 969
 970     visit_type_int32(v, &value, name, errp);
 971 }
 972
 973 static bool memory_region_get_may_overlap(Object *obj, Error **errp)
 974 {
 975     MemoryRegion *mr = MEMORY_REGION(obj);
 976
 977     return mr->may_overlap;
 978 }
 979
 980 static void memory_region_get_size(Object *obj, Visitor *v, void *opaque,
 981                                    const char *name, Error **errp)
 982 {
 983     MemoryRegion *mr = MEMORY_REGION(obj);
 984     uint64_t value = memory_region_size(mr);
 985
 986     visit_type_uint64(v, &value, name, errp);
 987 }
 988
 989 static void memory_region_initfn(Object *obj)
 990 {
 991     MemoryRegion *mr = MEMORY_REGION(obj);
 992     ObjectProperty *op;
 993
 994     mr->ops = &unassigned_mem_ops;
 995     mr->ram_addr = RAM_ADDR_INVALID;
 996     mr->enabled = true;
 997     mr->romd_mode = true;
 998     mr->global_locking = true;
 999     mr->destructor = memory_region_destructor_none;
1000     QTAILQ_INIT(&mr->subregions);
1001     QTAILQ_INIT(&mr->coalesced);
1002
1003     op = object_property_add(OBJECT(mr), "container",
1004                              "link<" TYPE_MEMORY_REGION ">",
1005                              memory_region_get_container,
1006                              NULL, /* memory_region_set_container */
1007                              NULL, NULL, &error_abort);
1008     op->resolve = memory_region_resolve_container;
1009
1010     object_property_add(OBJECT(mr), "addr", "uint64",
1011                         memory_region_get_addr,
1012                         NULL, /* memory_region_set_addr */
1013                         NULL, NULL, &error_abort);
1014     object_property_add(OBJECT(mr), "priority", "uint32",
1015                         memory_region_get_priority,
1016                         NULL, /* memory_region_set_priority */
1017                         NULL, NULL, &error_abort);
1018     object_property_add_bool(OBJECT(mr), "may-overlap",
1019                              memory_region_get_may_overlap,
1020                              NULL, /* memory_region_set_may_overlap */
1021                              &error_abort);
1022     object_property_add(OBJECT(mr), "size", "uint64",
1023                         memory_region_get_size,
1024                         NULL, /* memory_region_set_size, */
1025                         NULL, NULL, &error_abort);
1026 }
1027
1028 static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
1029                                     unsigned size)
1030 {
1031 #ifdef DEBUG_UNASSIGNED
1032     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
1033 #endif
1034     if (current_cpu != NULL) {
1035         cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
1036     }
1037     return 0;
1038 }
1039
1040 static void unassigned_mem_write(void *opaque, hwaddr addr,
1041                                  uint64_t val, unsigned size)
1042 {
1043 #ifdef DEBUG_UNASSIGNED
1044     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
1045 #endif
1046     if (current_cpu != NULL) {
1047         cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
1048     }
1049 }
1050
1051 static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
1052                                    unsigned size, bool is_write)
1053 {
1054     return false;
1055 }
1056
1057 const MemoryRegionOps unassigned_mem_ops = {
1058     .valid.accepts = unassigned_mem_accepts,
1059     .endianness = DEVICE_NATIVE_ENDIAN,
1060 };
1061
1062 bool memory_region_access_valid(MemoryRegion *mr,
1063                                 hwaddr addr,
1064                                 unsigned size,
1065                                 bool is_write)
1066 {
1067     int access_size_min, access_size_max;
1068     int access_size, i;
1069
1070     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
1071         return false;
1072     }
1073
1074     if (!mr->ops->valid.accepts) {
1075         return true;
1076     }
1077
1078     access_size_min = mr->ops->valid.min_access_size;
1079     if (!mr->ops->valid.min_access_size) {
1080         access_size_min = 1;
1081     }
1082
1083     access_size_max = mr->ops->valid.max_access_size;
1084     if (!mr->ops->valid.max_access_size) {
1085         access_size_max = 4;
1086     }
1087
1088     access_size = MAX(MIN(size, access_size_max), access_size_min);
1089     for (i = 0; i < size; i += access_size) {
1090         if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size,
1091                                     is_write)) {
1092             return false;
1093         }
1094     }
1095
1096     return true;
1097 }
1098
1099 static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr,
1100                                                 hwaddr addr,
1101                                                 uint64_t *pval,
1102                                                 unsigned size,
1103                                                 MemTxAttrs attrs)
1104 {
1105     *pval = 0;
1106
1107     if (mr->ops->read) {
1108         return access_with_adjusted_size(addr, pval, size,
1109                                          mr->ops->impl.min_access_size,
1110                                          mr->ops->impl.max_access_size,
1111                                          memory_region_read_accessor,
1112                                          mr, attrs);
1113     } else if (mr->ops->read_with_attrs) {
1114         return access_with_adjusted_size(addr, pval, size,
1115                                          mr->ops->impl.min_access_size,
1116                                          mr->ops->impl.max_access_size,
1117                                          memory_region_read_with_attrs_accessor,
1118                                          mr, attrs);
1119     } else {
1120         return access_with_adjusted_size(addr, pval, size, 1, 4,
1121                                          memory_region_oldmmio_read_accessor,
1122                                          mr, attrs);
1123     }
1124 }
1125
1126 MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
1127                                         hwaddr addr,
1128                                         uint64_t *pval,
1129                                         unsigned size,
1130                                         MemTxAttrs attrs)
1131 {
1132     MemTxResult r;
1133
1134     if (!memory_region_access_valid(mr, addr, size, false)) {
1135         *pval = unassigned_mem_read(mr, addr, size);
1136         return MEMTX_DECODE_ERROR;
1137     }
1138
1139     r = memory_region_dispatch_read1(mr, addr, pval, size, attrs);
1140     adjust_endianness(mr, pval, size);
1141     return r;
1142 }
1143
1144 MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
1145                                          hwaddr addr,
1146                                          uint64_t data,
1147                                          unsigned size,
1148                                          MemTxAttrs attrs)
1149 {
1150     if (!memory_region_access_valid(mr, addr, size, true)) {
1151         unassigned_mem_write(mr, addr, data, size);
1152         return MEMTX_DECODE_ERROR;
1153     }
1154
1155     adjust_endianness(mr, &data, size);
1156
1157     if (mr->ops->write) {
1158         return access_with_adjusted_size(addr, &data, size,
1159                                          mr->ops->impl.min_access_size,
1160                                          mr->ops->impl.max_access_size,
1161                                          memory_region_write_accessor, mr,
1162                                          attrs);
1163     } else if (mr->ops->write_with_attrs) {
1164         return
1165             access_with_adjusted_size(addr, &data, size,
1166                                       mr->ops->impl.min_access_size,
1167                                       mr->ops->impl.max_access_size,
1168                                       memory_region_write_with_attrs_accessor,
1169                                       mr, attrs);
1170     } else {
1171         return access_with_adjusted_size(addr, &data, size, 1, 4,
1172                                          memory_region_oldmmio_write_accessor,
1173                                          mr, attrs);
1174     }
1175 }
1176
1177 void memory_region_init_io(MemoryRegion *mr,
1178                            Object *owner,
1179                            const MemoryRegionOps *ops,
1180                            void *opaque,
1181                            const char *name,
1182                            uint64_t size)
1183 {
1184     memory_region_init(mr, owner, name, size);
1185     mr->ops = ops ? ops : &unassigned_mem_ops;
1186     mr->opaque = opaque;
1187     mr->terminates = true;
1188 }
1189
1190 void memory_region_init_ram(MemoryRegion *mr,
1191                             Object *owner,
1192                             const char *name,
1193                             uint64_t size,
1194                             Error **errp)
1195 {
1196     memory_region_init(mr, owner, name, size);
1197     mr->ram = true;
1198     mr->terminates = true;
1199     mr->destructor = memory_region_destructor_ram;
1200     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1201     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1202 }
1203
1204 void memory_region_init_resizeable_ram(MemoryRegion *mr,
1205                                        Object *owner,
1206                                        const char *name,
1207                                        uint64_t size,
1208                                        uint64_t max_size,
1209                                        void (*resized)(const char*,
1210                                                        uint64_t length,
1211                                                        void *host),
1212                                        Error **errp)
1213 {
1214     memory_region_init(mr, owner, name, size);
1215     mr->ram = true;
1216     mr->terminates = true;
1217     mr->destructor = memory_region_destructor_ram;
1218     mr->ram_addr = qemu_ram_alloc_resizeable(size, max_size, resized, mr, errp);
1219     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1220 }
1221
1222 #ifdef __linux__
1223 void memory_region_init_ram_from_file(MemoryRegion *mr,
1224                                       struct Object *owner,
1225                                       const char *name,
1226                                       uint64_t size,
1227                                       bool share,
1228                                       const char *path,
1229                                       Error **errp)
1230 {
1231     memory_region_init(mr, owner, name, size);
1232     mr->ram = true;
1233     mr->terminates = true;
1234     mr->destructor = memory_region_destructor_ram;
1235     mr->ram_addr = qemu_ram_alloc_from_file(size, mr, share, path, errp);
1236     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1237 }
1238 #endif
1239
1240 void memory_region_init_ram_ptr(MemoryRegion *mr,
1241                                 Object *owner,
1242                                 const char *name,
1243                                 uint64_t size,
1244                                 void *ptr)
1245 {
1246     memory_region_init(mr, owner, name, size);
1247     mr->ram = true;
1248     mr->terminates = true;
1249     mr->destructor = memory_region_destructor_ram_from_ptr;
1250     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1251
1252     /* qemu_ram_alloc_from_ptr cannot fail with ptr != NULL.  */
1253     assert(ptr != NULL);
1254     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr, &error_fatal);
1255 }
1256
1257 void memory_region_set_skip_dump(MemoryRegion *mr)
1258 {
1259     mr->skip_dump = true;
1260 }
1261
1262 void memory_region_init_alias(MemoryRegion *mr,
1263                               Object *owner,
1264                               const char *name,
1265                               MemoryRegion *orig,
1266                               hwaddr offset,
1267                               uint64_t size)
1268 {
1269     memory_region_init(mr, owner, name, size);
1270     mr->alias = orig;
1271     mr->alias_offset = offset;
1272 }
1273
1274 void memory_region_init_rom_device(MemoryRegion *mr,
1275                                    Object *owner,
1276                                    const MemoryRegionOps *ops,
1277                                    void *opaque,
1278                                    const char *name,
1279                                    uint64_t size,
1280                                    Error **errp)
1281 {
1282     memory_region_init(mr, owner, name, size);
1283     mr->ops = ops;
1284     mr->opaque = opaque;
1285     mr->terminates = true;
1286     mr->rom_device = true;
1287     mr->destructor = memory_region_destructor_rom_device;
1288     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1289 }
1290
1291 void memory_region_init_iommu(MemoryRegion *mr,
1292                               Object *owner,
1293                               const MemoryRegionIOMMUOps *ops,
1294                               const char *name,
1295                               uint64_t size)
1296 {
1297     memory_region_init(mr, owner, name, size);
1298     mr->iommu_ops = ops,
1299     mr->terminates = true;  /* then re-forwards */
1300     notifier_list_init(&mr->iommu_notify);
1301 }
1302
1303 static void memory_region_finalize(Object *obj)
1304 {
1305     MemoryRegion *mr = MEMORY_REGION(obj);
1306
1307     assert(!mr->container);
1308
1309     /* We know the region is not visible in any address space (it
1310      * does not have a container and cannot be a root either because
1311      * it has no references, so we can blindly clear mr->enabled.
1312      * memory_region_set_enabled instead could trigger a transaction
1313      * and cause an infinite loop.
1314      */
1315     mr->enabled = false;
1316     memory_region_transaction_begin();
1317     while (!QTAILQ_EMPTY(&mr->subregions)) {
1318         MemoryRegion *subregion = QTAILQ_FIRST(&mr->subregions);
1319         memory_region_del_subregion(mr, subregion);
1320     }
1321     memory_region_transaction_commit();
1322
1323     mr->destructor(mr);
1324     memory_region_clear_coalescing(mr);
1325     g_free((char *)mr->name);
1326     g_free(mr->ioeventfds);
1327 }
1328
1329 Object *memory_region_owner(MemoryRegion *mr)
1330 {
1331     Object *obj = OBJECT(mr);
1332     return obj->parent;
1333 }
1334
1335 void memory_region_ref(MemoryRegion *mr)
1336 {
1337     /* MMIO callbacks most likely will access data that belongs
1338      * to the owner, hence the need to ref/unref the owner whenever
1339      * the memory region is in use.
1340      *
1341      * The memory region is a child of its owner.  As long as the
1342      * owner doesn't call unparent itself on the memory region,
1343      * ref-ing the owner will also keep the memory region alive.
1344      * Memory regions without an owner are supposed to never go away,
1345      * but we still ref/unref them for debugging purposes.
1346      */
1347     Object *obj = OBJECT(mr);
1348     if (obj && obj->parent) {
1349         object_ref(obj->parent);
1350     } else {
1351         object_ref(obj);
1352     }
1353 }
1354
1355 void memory_region_unref(MemoryRegion *mr)
1356 {
1357     Object *obj = OBJECT(mr);
1358     if (obj && obj->parent) {
1359         object_unref(obj->parent);
1360     } else {
1361         object_unref(obj);
1362     }
1363 }
1364
1365 uint64_t memory_region_size(MemoryRegion *mr)
1366 {
1367     if (int128_eq(mr->size, int128_2_64())) {
1368         return UINT64_MAX;
1369     }
1370     return int128_get64(mr->size);
1371 }
1372
1373 const char *memory_region_name(const MemoryRegion *mr)
1374 {
1375     if (!mr->name) {
1376         ((MemoryRegion *)mr)->name =
1377             object_get_canonical_path_component(OBJECT(mr));
1378     }
1379     return mr->name;
1380 }
1381
1382 bool memory_region_is_ram(MemoryRegion *mr)
1383 {
1384     return mr->ram;
1385 }
1386
1387 bool memory_region_is_skip_dump(MemoryRegion *mr)
1388 {
1389     return mr->skip_dump;
1390 }
1391
1392 uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
1393 {
1394     uint8_t mask = mr->dirty_log_mask;
1395     if (global_dirty_log) {
1396         mask |= (1 << DIRTY_MEMORY_MIGRATION);
1397     }
1398     return mask;
1399 }
1400
1401 bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
1402 {
1403     return memory_region_get_dirty_log_mask(mr) & (1 << client);
1404 }
1405
1406 bool memory_region_is_rom(MemoryRegion *mr)
1407 {
1408     return mr->ram && mr->readonly;
1409 }
1410
1411 bool memory_region_is_iommu(MemoryRegion *mr)
1412 {
1413     return mr->iommu_ops;
1414 }
1415
1416 void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
1417 {
1418     notifier_list_add(&mr->iommu_notify, n);
1419 }
1420
1421 void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n,
1422                                 hwaddr granularity, bool is_write)
1423 {
1424     hwaddr addr;
1425     IOMMUTLBEntry iotlb;
1426
1427     for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
1428         iotlb = mr->iommu_ops->translate(mr, addr, is_write);
1429         if (iotlb.perm != IOMMU_NONE) {
1430             n->notify(n, &iotlb);
1431         }
1432
1433         /* if (2^64 - MR size) < granularity, it's possible to get an
1434          * infinite loop here.  This should catch such a wraparound */
1435         if ((addr + granularity) < addr) {
1436             break;
1437         }
1438     }
1439 }
1440
1441 void memory_region_unregister_iommu_notifier(Notifier *n)
1442 {
1443     notifier_remove(n);
1444 }
1445
1446 void memory_region_notify_iommu(MemoryRegion *mr,
1447                                 IOMMUTLBEntry entry)
1448 {
1449     assert(memory_region_is_iommu(mr));
1450     notifier_list_notify(&mr->iommu_notify, &entry);
1451 }
1452
1453 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1454 {
1455     uint8_t mask = 1 << client;
1456     uint8_t old_logging;
1457
1458     assert(client == DIRTY_MEMORY_VGA);
1459     old_logging = mr->vga_logging_count;
1460     mr->vga_logging_count += log ? 1 : -1;
1461     if (!!old_logging == !!mr->vga_logging_count) {
1462         return;
1463     }
1464
1465     memory_region_transaction_begin();
1466     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1467     memory_region_update_pending |= mr->enabled;
1468     memory_region_transaction_commit();
1469 }
1470
1471 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1472                              hwaddr size, unsigned client)
1473 {
1474     assert(mr->ram_addr != RAM_ADDR_INVALID);
1475     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1476 }
1477
1478 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1479                              hwaddr size)
1480 {
1481     assert(mr->ram_addr != RAM_ADDR_INVALID);
1482     cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size,
1483                                         memory_region_get_dirty_log_mask(mr));
1484 }
1485
1486 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1487                                         hwaddr size, unsigned client)
1488 {
1489     assert(mr->ram_addr != RAM_ADDR_INVALID);
1490     return cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr,
1491                                                     size, client);
1492 }
1493
1494
1495 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1496 {
1497     AddressSpace *as;
1498     FlatRange *fr;
1499
1500     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1501         FlatView *view = address_space_get_flatview(as);
1502         FOR_EACH_FLAT_RANGE(fr, view) {
1503             if (fr->mr == mr) {
1504                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1505             }
1506         }
1507         flatview_unref(view);
1508     }
1509 }
1510
1511 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1512 {
1513     if (mr->readonly != readonly) {
1514         memory_region_transaction_begin();
1515         mr->readonly = readonly;
1516         memory_region_update_pending |= mr->enabled;
1517         memory_region_transaction_commit();
1518     }
1519 }
1520
1521 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1522 {
1523     if (mr->romd_mode != romd_mode) {
1524         memory_region_transaction_begin();
1525         mr->romd_mode = romd_mode;
1526         memory_region_update_pending |= mr->enabled;
1527         memory_region_transaction_commit();
1528     }
1529 }
1530
1531 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1532                                hwaddr size, unsigned client)
1533 {
1534     assert(mr->ram_addr != RAM_ADDR_INVALID);
1535     cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr, size,
1536                                              client);
1537 }
1538
1539 int memory_region_get_fd(MemoryRegion *mr)
1540 {
1541     if (mr->alias) {
1542         return memory_region_get_fd(mr->alias);
1543     }
1544
1545     assert(mr->ram_addr != RAM_ADDR_INVALID);
1546
1547     return qemu_get_ram_fd(mr->ram_addr & TARGET_PAGE_MASK);
1548 }
1549
1550 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1551 {
1552     if (mr->alias) {
1553         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1554     }
1555
1556     assert(mr->ram_addr != RAM_ADDR_INVALID);
1557
1558     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1559 }
1560
1561 void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp)
1562 {
1563     assert(mr->ram_addr != RAM_ADDR_INVALID);
1564
1565     qemu_ram_resize(mr->ram_addr, newsize, errp);
1566 }
1567
1568 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1569 {
1570     FlatView *view;
1571     FlatRange *fr;
1572     CoalescedMemoryRange *cmr;
1573     AddrRange tmp;
1574     MemoryRegionSection section;
1575
1576     view = address_space_get_flatview(as);
1577     FOR_EACH_FLAT_RANGE(fr, view) {
1578         if (fr->mr == mr) {
1579             section = (MemoryRegionSection) {
1580                 .address_space = as,
1581                 .offset_within_address_space = int128_get64(fr->addr.start),
1582                 .size = fr->addr.size,
1583             };
1584
1585             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1586                                  int128_get64(fr->addr.start),
1587                                  int128_get64(fr->addr.size));
1588             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1589                 tmp = addrrange_shift(cmr->addr,
1590                                       int128_sub(fr->addr.start,
1591                                                  int128_make64(fr->offset_in_region)));
1592                 if (!addrrange_intersects(tmp, fr->addr)) {
1593                     continue;
1594                 }
1595                 tmp = addrrange_intersection(tmp, fr->addr);
1596                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1597                                      int128_get64(tmp.start),
1598                                      int128_get64(tmp.size));
1599             }
1600         }
1601     }
1602     flatview_unref(view);
1603 }
1604
1605 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1606 {
1607     AddressSpace *as;
1608
1609     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1610         memory_region_update_coalesced_range_as(mr, as);
1611     }
1612 }
1613
1614 void memory_region_set_coalescing(MemoryRegion *mr)
1615 {
1616     memory_region_clear_coalescing(mr);
1617     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1618 }
1619
1620 void memory_region_add_coalescing(MemoryRegion *mr,
1621                                   hwaddr offset,
1622                                   uint64_t size)
1623 {
1624     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1625
1626     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1627     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1628     memory_region_update_coalesced_range(mr);
1629     memory_region_set_flush_coalesced(mr);
1630 }
1631
1632 void memory_region_clear_coalescing(MemoryRegion *mr)
1633 {
1634     CoalescedMemoryRange *cmr;
1635     bool updated = false;
1636
1637     qemu_flush_coalesced_mmio_buffer();
1638     mr->flush_coalesced_mmio = false;
1639
1640     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1641         cmr = QTAILQ_FIRST(&mr->coalesced);
1642         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1643         g_free(cmr);
1644         updated = true;
1645     }
1646
1647     if (updated) {
1648         memory_region_update_coalesced_range(mr);
1649     }
1650 }
1651
1652 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1653 {
1654     mr->flush_coalesced_mmio = true;
1655 }
1656
1657 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1658 {
1659     qemu_flush_coalesced_mmio_buffer();
1660     if (QTAILQ_EMPTY(&mr->coalesced)) {
1661         mr->flush_coalesced_mmio = false;
1662     }
1663 }
1664
1665 void memory_region_set_global_locking(MemoryRegion *mr)
1666 {
1667     mr->global_locking = true;
1668 }
1669
1670 void memory_region_clear_global_locking(MemoryRegion *mr)
1671 {
1672     mr->global_locking = false;
1673 }
1674
1675 void memory_region_add_eventfd(MemoryRegion *mr,
1676                                hwaddr addr,
1677                                unsigned size,
1678                                bool match_data,
1679                                uint64_t data,
1680                                EventNotifier *e)
1681 {
1682     MemoryRegionIoeventfd mrfd = {
1683         .addr.start = int128_make64(addr),
1684         .addr.size = int128_make64(size),
1685         .match_data = match_data,
1686         .data = data,
1687         .e = e,
1688     };
1689     unsigned i;
1690
1691     adjust_endianness(mr, &mrfd.data, size);
1692     memory_region_transaction_begin();
1693     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1694         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1695             break;
1696         }
1697     }
1698     ++mr->ioeventfd_nb;
1699     mr->ioeventfds = g_realloc(mr->ioeventfds,
1700                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1701     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1702             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1703     mr->ioeventfds[i] = mrfd;
1704     ioeventfd_update_pending |= mr->enabled;
1705     memory_region_transaction_commit();
1706 }
1707
1708 void memory_region_del_eventfd(MemoryRegion *mr,
1709                                hwaddr addr,
1710                                unsigned size,
1711                                bool match_data,
1712                                uint64_t data,
1713                                EventNotifier *e)
1714 {
1715     MemoryRegionIoeventfd mrfd = {
1716         .addr.start = int128_make64(addr),
1717         .addr.size = int128_make64(size),
1718         .match_data = match_data,
1719         .data = data,
1720         .e = e,
1721     };
1722     unsigned i;
1723
1724     adjust_endianness(mr, &mrfd.data, size);
1725     memory_region_transaction_begin();
1726     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1727         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1728             break;
1729         }
1730     }
1731     assert(i != mr->ioeventfd_nb);
1732     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1733             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1734     --mr->ioeventfd_nb;
1735     mr->ioeventfds = g_realloc(mr->ioeventfds,
1736                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1737     ioeventfd_update_pending |= mr->enabled;
1738     memory_region_transaction_commit();
1739 }
1740
1741 static void memory_region_update_container_subregions(MemoryRegion *subregion)
1742 {
1743     hwaddr offset = subregion->addr;
1744     MemoryRegion *mr = subregion->container;
1745     MemoryRegion *other;
1746
1747     memory_region_transaction_begin();
1748
1749     memory_region_ref(subregion);
1750     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1751         if (subregion->may_overlap || other->may_overlap) {
1752             continue;
1753         }
1754         if (int128_ge(int128_make64(offset),
1755                       int128_add(int128_make64(other->addr), other->size))
1756             || int128_le(int128_add(int128_make64(offset), subregion->size),
1757                          int128_make64(other->addr))) {
1758             continue;
1759         }
1760 #if 0
1761         printf("warning: subregion collision %llx/%llx (%s) "
1762                "vs %llx/%llx (%s)\n",
1763                (unsigned long long)offset,
1764                (unsigned long long)int128_get64(subregion->size),
1765                subregion->name,
1766                (unsigned long long)other->addr,
1767                (unsigned long long)int128_get64(other->size),
1768                other->name);
1769 #endif
1770     }
1771     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1772         if (subregion->priority >= other->priority) {
1773             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1774             goto done;
1775         }
1776     }
1777     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1778 done:
1779     memory_region_update_pending |= mr->enabled && subregion->enabled;
1780     memory_region_transaction_commit();
1781 }
1782
1783 static void memory_region_add_subregion_common(MemoryRegion *mr,
1784                                                hwaddr offset,
1785                                                MemoryRegion *subregion)
1786 {
1787     assert(!subregion->container);
1788     subregion->container = mr;
1789     subregion->addr = offset;
1790     memory_region_update_container_subregions(subregion);
1791 }
1792
1793 void memory_region_add_subregion(MemoryRegion *mr,
1794                                  hwaddr offset,
1795                                  MemoryRegion *subregion)
1796 {
1797     subregion->may_overlap = false;
1798     subregion->priority = 0;
1799     memory_region_add_subregion_common(mr, offset, subregion);
1800 }
1801
1802 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1803                                          hwaddr offset,
1804                                          MemoryRegion *subregion,
1805                                          int priority)
1806 {
1807     subregion->may_overlap = true;
1808     subregion->priority = priority;
1809     memory_region_add_subregion_common(mr, offset, subregion);
1810 }
1811
1812 void memory_region_del_subregion(MemoryRegion *mr,
1813                                  MemoryRegion *subregion)
1814 {
1815     memory_region_transaction_begin();
1816     assert(subregion->container == mr);
1817     subregion->container = NULL;
1818     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1819     memory_region_unref(subregion);
1820     memory_region_update_pending |= mr->enabled && subregion->enabled;
1821     memory_region_transaction_commit();
1822 }
1823
1824 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1825 {
1826     if (enabled == mr->enabled) {
1827         return;
1828     }
1829     memory_region_transaction_begin();
1830     mr->enabled = enabled;
1831     memory_region_update_pending = true;
1832     memory_region_transaction_commit();
1833 }
1834
1835 void memory_region_set_size(MemoryRegion *mr, uint64_t size)
1836 {
1837     Int128 s = int128_make64(size);
1838
1839     if (size == UINT64_MAX) {
1840         s = int128_2_64();
1841     }
1842     if (int128_eq(s, mr->size)) {
1843         return;
1844     }
1845     memory_region_transaction_begin();
1846     mr->size = s;
1847     memory_region_update_pending = true;
1848     memory_region_transaction_commit();
1849 }
1850
1851 static void memory_region_readd_subregion(MemoryRegion *mr)
1852 {
1853     MemoryRegion *container = mr->container;
1854
1855     if (container) {
1856         memory_region_transaction_begin();
1857         memory_region_ref(mr);
1858         memory_region_del_subregion(container, mr);
1859         mr->container = container;
1860         memory_region_update_container_subregions(mr);
1861         memory_region_unref(mr);
1862         memory_region_transaction_commit();
1863     }
1864 }
1865
1866 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1867 {
1868     if (addr != mr->addr) {
1869         mr->addr = addr;
1870         memory_region_readd_subregion(mr);
1871     }
1872 }
1873
1874 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1875 {
1876     assert(mr->alias);
1877
1878     if (offset == mr->alias_offset) {
1879         return;
1880     }
1881
1882     memory_region_transaction_begin();
1883     mr->alias_offset = offset;
1884     memory_region_update_pending |= mr->enabled;
1885     memory_region_transaction_commit();
1886 }
1887
1888 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1889 {
1890     return mr->ram_addr;
1891 }
1892
1893 uint64_t memory_region_get_alignment(const MemoryRegion *mr)
1894 {
1895     return mr->align;
1896 }
1897
1898 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1899 {
1900     const AddrRange *addr = addr_;
1901     const FlatRange *fr = fr_;
1902
1903     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1904         return -1;
1905     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1906         return 1;
1907     }
1908     return 0;
1909 }
1910
1911 static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
1912 {
1913     return bsearch(&addr, view->ranges, view->nr,
1914                    sizeof(FlatRange), cmp_flatrange_addr);
1915 }
1916
1917 bool memory_region_is_mapped(MemoryRegion *mr)
1918 {
1919     return mr->container ? true : false;
1920 }
1921
1922 /* Same as memory_region_find, but it does not add a reference to the
1923  * returned region.  It must be called from an RCU critical section.
1924  */
1925 static MemoryRegionSection memory_region_find_rcu(MemoryRegion *mr,
1926                                                   hwaddr addr, uint64_t size)
1927 {
1928     MemoryRegionSection ret = { .mr = NULL };
1929     MemoryRegion *root;
1930     AddressSpace *as;
1931     AddrRange range;
1932     FlatView *view;
1933     FlatRange *fr;
1934
1935     addr += mr->addr;
1936     for (root = mr; root->container; ) {
1937         root = root->container;
1938         addr += root->addr;
1939     }
1940
1941     as = memory_region_to_address_space(root);
1942     if (!as) {
1943         return ret;
1944     }
1945     range = addrrange_make(int128_make64(addr), int128_make64(size));
1946
1947     view = atomic_rcu_read(&as->current_map);
1948     fr = flatview_lookup(view, range);
1949     if (!fr) {
1950         return ret;
1951     }
1952
1953     while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
1954         --fr;
1955     }
1956
1957     ret.mr = fr->mr;
1958     ret.address_space = as;
1959     range = addrrange_intersection(range, fr->addr);
1960     ret.offset_within_region = fr->offset_in_region;
1961     ret.offset_within_region += int128_get64(int128_sub(range.start,
1962                                                         fr->addr.start));
1963     ret.size = range.size;
1964     ret.offset_within_address_space = int128_get64(range.start);
1965     ret.readonly = fr->readonly;
1966     return ret;
1967 }
1968
1969 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1970                                        hwaddr addr, uint64_t size)
1971 {
1972     MemoryRegionSection ret;
1973     rcu_read_lock();
1974     ret = memory_region_find_rcu(mr, addr, size);
1975     if (ret.mr) {
1976         memory_region_ref(ret.mr);
1977     }
1978     rcu_read_unlock();
1979     return ret;
1980 }
1981
1982 bool memory_region_present(MemoryRegion *container, hwaddr addr)
1983 {
1984     MemoryRegion *mr;
1985
1986     rcu_read_lock();
1987     mr = memory_region_find_rcu(container, addr, 1).mr;
1988     rcu_read_unlock();
1989     return mr && mr != container;
1990 }
1991
1992 void address_space_sync_dirty_bitmap(AddressSpace *as)
1993 {
1994     FlatView *view;
1995     FlatRange *fr;
1996
1997     view = address_space_get_flatview(as);
1998     FOR_EACH_FLAT_RANGE(fr, view) {
1999         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
2000     }
2001     flatview_unref(view);
2002 }
2003
2004 void memory_global_dirty_log_start(void)
2005 {
2006     global_dirty_log = true;
2007
2008     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
2009
2010     /* Refresh DIRTY_LOG_MIGRATION bit.  */
2011     memory_region_transaction_begin();
2012     memory_region_update_pending = true;
2013     memory_region_transaction_commit();
2014 }
2015
2016 void memory_global_dirty_log_stop(void)
2017 {
2018     global_dirty_log = false;
2019
2020     /* Refresh DIRTY_LOG_MIGRATION bit.  */
2021     memory_region_transaction_begin();
2022     memory_region_update_pending = true;
2023     memory_region_transaction_commit();
2024
2025     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
2026 }
2027
2028 static void listener_add_address_space(MemoryListener *listener,
2029                                        AddressSpace *as)
2030 {
2031     FlatView *view;
2032     FlatRange *fr;
2033
2034     if (listener->address_space_filter
2035         && listener->address_space_filter != as) {
2036         return;
2037     }
2038
2039     if (global_dirty_log) {
2040         if (listener->log_global_start) {
2041             listener->log_global_start(listener);
2042         }
2043     }
2044
2045     view = address_space_get_flatview(as);
2046     FOR_EACH_FLAT_RANGE(fr, view) {
2047         MemoryRegionSection section = {
2048             .mr = fr->mr,
2049             .address_space = as,
2050             .offset_within_region = fr->offset_in_region,
2051             .size = fr->addr.size,
2052             .offset_within_address_space = int128_get64(fr->addr.start),
2053             .readonly = fr->readonly,
2054         };
2055         if (listener->region_add) {
2056             listener->region_add(listener, &section);
2057         }
2058     }
2059     flatview_unref(view);
2060 }
2061
2062 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
2063 {
2064     MemoryListener *other = NULL;
2065     AddressSpace *as;
2066
2067     listener->address_space_filter = filter;
2068     if (QTAILQ_EMPTY(&memory_listeners)
2069         || listener->priority >= QTAILQ_LAST(&memory_listeners,
2070                                              memory_listeners)->priority) {
2071         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
2072     } else {
2073         QTAILQ_FOREACH(other, &memory_listeners, link) {
2074             if (listener->priority < other->priority) {
2075                 break;
2076             }
2077         }
2078         QTAILQ_INSERT_BEFORE(other, listener, link);
2079     }
2080
2081     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2082         listener_add_address_space(listener, as);
2083     }
2084 }
2085
2086 void memory_listener_unregister(MemoryListener *listener)
2087 {
2088     QTAILQ_REMOVE(&memory_listeners, listener, link);
2089 }
2090
2091 void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
2092 {
2093     memory_region_ref(root);
2094     memory_region_transaction_begin();
2095     as->root = root;
2096     as->current_map = g_new(FlatView, 1);
2097     flatview_init(as->current_map);
2098     as->ioeventfd_nb = 0;
2099     as->ioeventfds = NULL;
2100     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
2101     as->name = g_strdup(name ? name : "anonymous");
2102     address_space_init_dispatch(as);
2103     memory_region_update_pending |= root->enabled;
2104     memory_region_transaction_commit();
2105 }
2106
2107 static void do_address_space_destroy(AddressSpace *as)
2108 {
2109     MemoryListener *listener;
2110
2111     address_space_destroy_dispatch(as);
2112
2113     QTAILQ_FOREACH(listener, &memory_listeners, link) {
2114         assert(listener->address_space_filter != as);
2115     }
2116
2117     flatview_unref(as->current_map);
2118     g_free(as->name);
2119     g_free(as->ioeventfds);
2120     memory_region_unref(as->root);
2121 }
2122
2123 void address_space_destroy(AddressSpace *as)
2124 {
2125     MemoryRegion *root = as->root;
2126
2127     /* Flush out anything from MemoryListeners listening in on this */
2128     memory_region_transaction_begin();
2129     as->root = NULL;
2130     memory_region_transaction_commit();
2131     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
2132     address_space_unregister(as);
2133
2134     /* At this point, as->dispatch and as->current_map are dummy
2135      * entries that the guest should never use.  Wait for the old
2136      * values to expire before freeing the data.
2137      */
2138     as->root = root;
2139     call_rcu(as, do_address_space_destroy, rcu);
2140 }
2141
2142 typedef struct MemoryRegionList MemoryRegionList;
2143
2144 struct MemoryRegionList {
2145     const MemoryRegion *mr;
2146     QTAILQ_ENTRY(MemoryRegionList) queue;
2147 };
2148
2149 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
2150
2151 static void mtree_print_mr(fprintf_function mon_printf, void *f,
2152                            const MemoryRegion *mr, unsigned int level,
2153                            hwaddr base,
2154                            MemoryRegionListHead *alias_print_queue)
2155 {
2156     MemoryRegionList *new_ml, *ml, *next_ml;
2157     MemoryRegionListHead submr_print_queue;
2158     const MemoryRegion *submr;
2159     unsigned int i;
2160
2161     if (!mr) {
2162         return;
2163     }
2164
2165     for (i = 0; i < level; i++) {
2166         mon_printf(f, "  ");
2167     }
2168
2169     if (mr->alias) {
2170         MemoryRegionList *ml;
2171         bool found = false;
2172
2173         /* check if the alias is already in the queue */
2174         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
2175             if (ml->mr == mr->alias) {
2176                 found = true;
2177             }
2178         }
2179
2180         if (!found) {
2181             ml = g_new(MemoryRegionList, 1);
2182             ml->mr = mr->alias;
2183             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
2184         }
2185         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
2186                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
2187                    "-" TARGET_FMT_plx "%s\n",
2188                    base + mr->addr,
2189                    base + mr->addr
2190                    + (int128_nz(mr->size) ?
2191                       (hwaddr)int128_get64(int128_sub(mr->size,
2192                                                       int128_one())) : 0),
2193                    mr->priority,
2194                    mr->romd_mode ? 'R' : '-',
2195                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2196                                                                        : '-',
2197                    memory_region_name(mr),
2198                    memory_region_name(mr->alias),
2199                    mr->alias_offset,
2200                    mr->alias_offset
2201                    + (int128_nz(mr->size) ?
2202                       (hwaddr)int128_get64(int128_sub(mr->size,
2203                                                       int128_one())) : 0),
2204                    mr->enabled ? "" : " [disabled]");
2205     } else {
2206         mon_printf(f,
2207                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s%s\n",
2208                    base + mr->addr,
2209                    base + mr->addr
2210                    + (int128_nz(mr->size) ?
2211                       (hwaddr)int128_get64(int128_sub(mr->size,
2212                                                       int128_one())) : 0),
2213                    mr->priority,
2214                    mr->romd_mode ? 'R' : '-',
2215                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2216                                                                        : '-',
2217                    memory_region_name(mr),
2218                    mr->enabled ? "" : " [disabled]");
2219     }
2220
2221     QTAILQ_INIT(&submr_print_queue);
2222
2223     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
2224         new_ml = g_new(MemoryRegionList, 1);
2225         new_ml->mr = submr;
2226         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2227             if (new_ml->mr->addr < ml->mr->addr ||
2228                 (new_ml->mr->addr == ml->mr->addr &&
2229                  new_ml->mr->priority > ml->mr->priority)) {
2230                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
2231                 new_ml = NULL;
2232                 break;
2233             }
2234         }
2235         if (new_ml) {
2236             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
2237         }
2238     }
2239
2240     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2241         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
2242                        alias_print_queue);
2243     }
2244
2245     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
2246         g_free(ml);
2247     }
2248 }
2249
2250 void mtree_info(fprintf_function mon_printf, void *f)
2251 {
2252     MemoryRegionListHead ml_head;
2253     MemoryRegionList *ml, *ml2;
2254     AddressSpace *as;
2255
2256     QTAILQ_INIT(&ml_head);
2257
2258     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2259         mon_printf(f, "address-space: %s\n", as->name);
2260         mtree_print_mr(mon_printf, f, as->root, 1, 0, &ml_head);
2261         mon_printf(f, "\n");
2262     }
2263
2264     /* print aliased regions */
2265     QTAILQ_FOREACH(ml, &ml_head, queue) {
2266         mon_printf(f, "memory-region: %s\n", memory_region_name(ml->mr));
2267         mtree_print_mr(mon_printf, f, ml->mr, 1, 0, &ml_head);
2268         mon_printf(f, "\n");
2269     }
2270
2271     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
2272         g_free(ml);
2273     }
2274 }
2275
2276 static const TypeInfo memory_region_info = {
2277     .parent             = TYPE_OBJECT,
2278     .name               = TYPE_MEMORY_REGION,
2279     .instance_size      = sizeof(MemoryRegion),
2280     .instance_init      = memory_region_initfn,
2281     .instance_finalize  = memory_region_finalize,
2282 };
2283
2284 static void memory_register_types(void)
2285 {
2286     type_register_static(&memory_region_info);
2287 }
2288
2289 type_init(memory_register_types)