memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <[email protected]>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  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 "memory.h"
  17 #include "exec-memory.h"
  18 #include "ioport.h"
  19 #include "bitops.h"
  20 #include "kvm.h"
  21 #include <assert.h>
  22
  23 #define WANT_EXEC_OBSOLETE
  24 #include "exec-obsolete.h"
  25
  26 unsigned memory_region_transaction_depth = 0;
  27 static bool global_dirty_log = false;
  28
  29 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  30     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  31
  32 typedef struct AddrRange AddrRange;
  33
  34 /*
  35  * Note using signed integers limits us to physical addresses at most
  36  * 63 bits wide.  They are needed for negative offsetting in aliases
  37  * (large MemoryRegion::alias_offset).
  38  */
  39 struct AddrRange {
  40     Int128 start;
  41     Int128 size;
  42 };
  43
  44 static AddrRange addrrange_make(Int128 start, Int128 size)
  45 {
  46     return (AddrRange) { start, size };
  47 }
  48
  49 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  50 {
  51     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  52 }
  53
  54 static Int128 addrrange_end(AddrRange r)
  55 {
  56     return int128_add(r.start, r.size);
  57 }
  58
  59 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  60 {
  61     int128_addto(&range.start, delta);
  62     return range;
  63 }
  64
  65 static bool addrrange_contains(AddrRange range, Int128 addr)
  66 {
  67     return int128_ge(addr, range.start)
  68         && int128_lt(addr, addrrange_end(range));
  69 }
  70
  71 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  72 {
  73     return addrrange_contains(r1, r2.start)
  74         || addrrange_contains(r2, r1.start);
  75 }
  76
  77 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  78 {
  79     Int128 start = int128_max(r1.start, r2.start);
  80     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  81     return addrrange_make(start, int128_sub(end, start));
  82 }
  83
  84 enum ListenerDirection { Forward, Reverse };
  85
  86 static bool memory_listener_match(MemoryListener *listener,
  87                                   MemoryRegionSection *section)
  88 {
  89     return !listener->address_space_filter
  90         || listener->address_space_filter == section->address_space;
  91 }
  92
  93 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
  94     do {                                                                \
  95         MemoryListener *_listener;                                      \
  96                                                                         \
  97         switch (_direction) {                                           \
  98         case Forward:                                                   \
  99             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 100                 _listener->_callback(_listener, ##_args);               \
 101             }                                                           \
 102             break;                                                      \
 103         case Reverse:                                                   \
 104             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 105                                    memory_listeners, link) {            \
 106                 _listener->_callback(_listener, ##_args);               \
 107             }                                                           \
 108             break;                                                      \
 109         default:                                                        \
 110             abort();                                                    \
 111         }                                                               \
 112     } while (0)
 113
 114 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 115     do {                                                                \
 116         MemoryListener *_listener;                                      \
 117                                                                         \
 118         switch (_direction) {                                           \
 119         case Forward:                                                   \
 120             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 121                 if (memory_listener_match(_listener, _section)) {       \
 122                     _listener->_callback(_listener, _section, ##_args); \
 123                 }                                                       \
 124             }                                                           \
 125             break;                                                      \
 126         case Reverse:                                                   \
 127             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 128                                    memory_listeners, link) {            \
 129                 if (memory_listener_match(_listener, _section)) {       \
 130                     _listener->_callback(_listener, _section, ##_args); \
 131                 }                                                       \
 132             }                                                           \
 133             break;                                                      \
 134         default:                                                        \
 135             abort();                                                    \
 136         }                                                               \
 137     } while (0)
 138
 139 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback)            \
 140     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 141         .mr = (fr)->mr,                                                 \
 142         .address_space = (as)->root,                                    \
 143         .offset_within_region = (fr)->offset_in_region,                 \
 144         .size = int128_get64((fr)->addr.size),                          \
 145         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 146         .readonly = (fr)->readonly,                                     \
 147               }))
 148
 149 struct CoalescedMemoryRange {
 150     AddrRange addr;
 151     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 152 };
 153
 154 struct MemoryRegionIoeventfd {
 155     AddrRange addr;
 156     bool match_data;
 157     uint64_t data;
 158     EventNotifier *e;
 159 };
 160
 161 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 162                                            MemoryRegionIoeventfd b)
 163 {
 164     if (int128_lt(a.addr.start, b.addr.start)) {
 165         return true;
 166     } else if (int128_gt(a.addr.start, b.addr.start)) {
 167         return false;
 168     } else if (int128_lt(a.addr.size, b.addr.size)) {
 169         return true;
 170     } else if (int128_gt(a.addr.size, b.addr.size)) {
 171         return false;
 172     } else if (a.match_data < b.match_data) {
 173         return true;
 174     } else  if (a.match_data > b.match_data) {
 175         return false;
 176     } else if (a.match_data) {
 177         if (a.data < b.data) {
 178             return true;
 179         } else if (a.data > b.data) {
 180             return false;
 181         }
 182     }
 183     if (a.e < b.e) {
 184         return true;
 185     } else if (a.e > b.e) {
 186         return false;
 187     }
 188     return false;
 189 }
 190
 191 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 192                                           MemoryRegionIoeventfd b)
 193 {
 194     return !memory_region_ioeventfd_before(a, b)
 195         && !memory_region_ioeventfd_before(b, a);
 196 }
 197
 198 typedef struct FlatRange FlatRange;
 199 typedef struct FlatView FlatView;
 200
 201 /* Range of memory in the global map.  Addresses are absolute. */
 202 struct FlatRange {
 203     MemoryRegion *mr;
 204     target_phys_addr_t offset_in_region;
 205     AddrRange addr;
 206     uint8_t dirty_log_mask;
 207     bool readable;
 208     bool readonly;
 209 };
 210
 211 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 212  * order.
 213  */
 214 struct FlatView {
 215     FlatRange *ranges;
 216     unsigned nr;
 217     unsigned nr_allocated;
 218 };
 219
 220 typedef struct AddressSpace AddressSpace;
 221 typedef struct AddressSpaceOps AddressSpaceOps;
 222
 223 /* A system address space - I/O, memory, etc. */
 224 struct AddressSpace {
 225     MemoryRegion *root;
 226     FlatView current_map;
 227     int ioeventfd_nb;
 228     MemoryRegionIoeventfd *ioeventfds;
 229 };
 230
 231 #define FOR_EACH_FLAT_RANGE(var, view)          \
 232     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 233
 234 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 235 {
 236     return a->mr == b->mr
 237         && addrrange_equal(a->addr, b->addr)
 238         && a->offset_in_region == b->offset_in_region
 239         && a->readable == b->readable
 240         && a->readonly == b->readonly;
 241 }
 242
 243 static void flatview_init(FlatView *view)
 244 {
 245     view->ranges = NULL;
 246     view->nr = 0;
 247     view->nr_allocated = 0;
 248 }
 249
 250 /* Insert a range into a given position.  Caller is responsible for maintaining
 251  * sorting order.
 252  */
 253 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 254 {
 255     if (view->nr == view->nr_allocated) {
 256         view->nr_allocated = MAX(2 * view->nr, 10);
 257         view->ranges = g_realloc(view->ranges,
 258                                     view->nr_allocated * sizeof(*view->ranges));
 259     }
 260     memmove(view->ranges + pos + 1, view->ranges + pos,
 261             (view->nr - pos) * sizeof(FlatRange));
 262     view->ranges[pos] = *range;
 263     ++view->nr;
 264 }
 265
 266 static void flatview_destroy(FlatView *view)
 267 {
 268     g_free(view->ranges);
 269 }
 270
 271 static bool can_merge(FlatRange *r1, FlatRange *r2)
 272 {
 273     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 274         && r1->mr == r2->mr
 275         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 276                                 r1->addr.size),
 277                      int128_make64(r2->offset_in_region))
 278         && r1->dirty_log_mask == r2->dirty_log_mask
 279         && r1->readable == r2->readable
 280         && r1->readonly == r2->readonly;
 281 }
 282
 283 /* Attempt to simplify a view by merging ajacent ranges */
 284 static void flatview_simplify(FlatView *view)
 285 {
 286     unsigned i, j;
 287
 288     i = 0;
 289     while (i < view->nr) {
 290         j = i + 1;
 291         while (j < view->nr
 292                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 293             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 294             ++j;
 295         }
 296         ++i;
 297         memmove(&view->ranges[i], &view->ranges[j],
 298                 (view->nr - j) * sizeof(view->ranges[j]));
 299         view->nr -= j - i;
 300     }
 301 }
 302
 303 static void memory_region_read_accessor(void *opaque,
 304                                         target_phys_addr_t addr,
 305                                         uint64_t *value,
 306                                         unsigned size,
 307                                         unsigned shift,
 308                                         uint64_t mask)
 309 {
 310     MemoryRegion *mr = opaque;
 311     uint64_t tmp;
 312
 313     if (mr->flush_coalesced_mmio) {
 314         qemu_flush_coalesced_mmio_buffer();
 315     }
 316     tmp = mr->ops->read(mr->opaque, addr, size);
 317     *value |= (tmp & mask) << shift;
 318 }
 319
 320 static void memory_region_write_accessor(void *opaque,
 321                                          target_phys_addr_t addr,
 322                                          uint64_t *value,
 323                                          unsigned size,
 324                                          unsigned shift,
 325                                          uint64_t mask)
 326 {
 327     MemoryRegion *mr = opaque;
 328     uint64_t tmp;
 329
 330     if (mr->flush_coalesced_mmio) {
 331         qemu_flush_coalesced_mmio_buffer();
 332     }
 333     tmp = (*value >> shift) & mask;
 334     mr->ops->write(mr->opaque, addr, tmp, size);
 335 }
 336
 337 static void access_with_adjusted_size(target_phys_addr_t addr,
 338                                       uint64_t *value,
 339                                       unsigned size,
 340                                       unsigned access_size_min,
 341                                       unsigned access_size_max,
 342                                       void (*access)(void *opaque,
 343                                                      target_phys_addr_t addr,
 344                                                      uint64_t *value,
 345                                                      unsigned size,
 346                                                      unsigned shift,
 347                                                      uint64_t mask),
 348                                       void *opaque)
 349 {
 350     uint64_t access_mask;
 351     unsigned access_size;
 352     unsigned i;
 353
 354     if (!access_size_min) {
 355         access_size_min = 1;
 356     }
 357     if (!access_size_max) {
 358         access_size_max = 4;
 359     }
 360     access_size = MAX(MIN(size, access_size_max), access_size_min);
 361     access_mask = -1ULL >> (64 - access_size * 8);
 362     for (i = 0; i < size; i += access_size) {
 363         /* FIXME: big-endian support */
 364         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 365     }
 366 }
 367
 368 static AddressSpace address_space_memory;
 369
 370 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 371                                              unsigned width, bool write)
 372 {
 373     const MemoryRegionPortio *mrp;
 374
 375     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 376         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 377             && width == mrp->size
 378             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 379             return mrp;
 380         }
 381     }
 382     return NULL;
 383 }
 384
 385 static void memory_region_iorange_read(IORange *iorange,
 386                                        uint64_t offset,
 387                                        unsigned width,
 388                                        uint64_t *data)
 389 {
 390     MemoryRegionIORange *mrio
 391         = container_of(iorange, MemoryRegionIORange, iorange);
 392     MemoryRegion *mr = mrio->mr;
 393
 394     offset += mrio->offset;
 395     if (mr->ops->old_portio) {
 396         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 397                                                     width, false);
 398
 399         *data = ((uint64_t)1 << (width * 8)) - 1;
 400         if (mrp) {
 401             *data = mrp->read(mr->opaque, offset);
 402         } else if (width == 2) {
 403             mrp = find_portio(mr, offset - mrio->offset, 1, false);
 404             assert(mrp);
 405             *data = mrp->read(mr->opaque, offset) |
 406                     (mrp->read(mr->opaque, offset + 1) << 8);
 407         }
 408         return;
 409     }
 410     *data = 0;
 411     access_with_adjusted_size(offset, data, width,
 412                               mr->ops->impl.min_access_size,
 413                               mr->ops->impl.max_access_size,
 414                               memory_region_read_accessor, mr);
 415 }
 416
 417 static void memory_region_iorange_write(IORange *iorange,
 418                                         uint64_t offset,
 419                                         unsigned width,
 420                                         uint64_t data)
 421 {
 422     MemoryRegionIORange *mrio
 423         = container_of(iorange, MemoryRegionIORange, iorange);
 424     MemoryRegion *mr = mrio->mr;
 425
 426     offset += mrio->offset;
 427     if (mr->ops->old_portio) {
 428         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 429                                                     width, true);
 430
 431         if (mrp) {
 432             mrp->write(mr->opaque, offset, data);
 433         } else if (width == 2) {
 434             mrp = find_portio(mr, offset - mrio->offset, 1, true);
 435             assert(mrp);
 436             mrp->write(mr->opaque, offset, data & 0xff);
 437             mrp->write(mr->opaque, offset + 1, data >> 8);
 438         }
 439         return;
 440     }
 441     access_with_adjusted_size(offset, &data, width,
 442                               mr->ops->impl.min_access_size,
 443                               mr->ops->impl.max_access_size,
 444                               memory_region_write_accessor, mr);
 445 }
 446
 447 static void memory_region_iorange_destructor(IORange *iorange)
 448 {
 449     g_free(container_of(iorange, MemoryRegionIORange, iorange));
 450 }
 451
 452 const IORangeOps memory_region_iorange_ops = {
 453     .read = memory_region_iorange_read,
 454     .write = memory_region_iorange_write,
 455     .destructor = memory_region_iorange_destructor,
 456 };
 457
 458 static AddressSpace address_space_io;
 459
 460 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 461 {
 462     while (mr->parent) {
 463         mr = mr->parent;
 464     }
 465     if (mr == address_space_memory.root) {
 466         return &address_space_memory;
 467     }
 468     if (mr == address_space_io.root) {
 469         return &address_space_io;
 470     }
 471     abort();
 472 }
 473
 474 /* Render a memory region into the global view.  Ranges in @view obscure
 475  * ranges in @mr.
 476  */
 477 static void render_memory_region(FlatView *view,
 478                                  MemoryRegion *mr,
 479                                  Int128 base,
 480                                  AddrRange clip,
 481                                  bool readonly)
 482 {
 483     MemoryRegion *subregion;
 484     unsigned i;
 485     target_phys_addr_t offset_in_region;
 486     Int128 remain;
 487     Int128 now;
 488     FlatRange fr;
 489     AddrRange tmp;
 490
 491     if (!mr->enabled) {
 492         return;
 493     }
 494
 495     int128_addto(&base, int128_make64(mr->addr));
 496     readonly |= mr->readonly;
 497
 498     tmp = addrrange_make(base, mr->size);
 499
 500     if (!addrrange_intersects(tmp, clip)) {
 501         return;
 502     }
 503
 504     clip = addrrange_intersection(tmp, clip);
 505
 506     if (mr->alias) {
 507         int128_subfrom(&base, int128_make64(mr->alias->addr));
 508         int128_subfrom(&base, int128_make64(mr->alias_offset));
 509         render_memory_region(view, mr->alias, base, clip, readonly);
 510         return;
 511     }
 512
 513     /* Render subregions in priority order. */
 514     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 515         render_memory_region(view, subregion, base, clip, readonly);
 516     }
 517
 518     if (!mr->terminates) {
 519         return;
 520     }
 521
 522     offset_in_region = int128_get64(int128_sub(clip.start, base));
 523     base = clip.start;
 524     remain = clip.size;
 525
 526     /* Render the region itself into any gaps left by the current view. */
 527     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 528         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 529             continue;
 530         }
 531         if (int128_lt(base, view->ranges[i].addr.start)) {
 532             now = int128_min(remain,
 533                              int128_sub(view->ranges[i].addr.start, base));
 534             fr.mr = mr;
 535             fr.offset_in_region = offset_in_region;
 536             fr.addr = addrrange_make(base, now);
 537             fr.dirty_log_mask = mr->dirty_log_mask;
 538             fr.readable = mr->readable;
 539             fr.readonly = readonly;
 540             flatview_insert(view, i, &fr);
 541             ++i;
 542             int128_addto(&base, now);
 543             offset_in_region += int128_get64(now);
 544             int128_subfrom(&remain, now);
 545         }
 546         if (int128_eq(base, view->ranges[i].addr.start)) {
 547             now = int128_min(remain, view->ranges[i].addr.size);
 548             int128_addto(&base, now);
 549             offset_in_region += int128_get64(now);
 550             int128_subfrom(&remain, now);
 551         }
 552     }
 553     if (int128_nz(remain)) {
 554         fr.mr = mr;
 555         fr.offset_in_region = offset_in_region;
 556         fr.addr = addrrange_make(base, remain);
 557         fr.dirty_log_mask = mr->dirty_log_mask;
 558         fr.readable = mr->readable;
 559         fr.readonly = readonly;
 560         flatview_insert(view, i, &fr);
 561     }
 562 }
 563
 564 /* Render a memory topology into a list of disjoint absolute ranges. */
 565 static FlatView generate_memory_topology(MemoryRegion *mr)
 566 {
 567     FlatView view;
 568
 569     flatview_init(&view);
 570
 571     render_memory_region(&view, mr, int128_zero(),
 572                          addrrange_make(int128_zero(), int128_2_64()), false);
 573     flatview_simplify(&view);
 574
 575     return view;
 576 }
 577
 578 static void address_space_add_del_ioeventfds(AddressSpace *as,
 579                                              MemoryRegionIoeventfd *fds_new,
 580                                              unsigned fds_new_nb,
 581                                              MemoryRegionIoeventfd *fds_old,
 582                                              unsigned fds_old_nb)
 583 {
 584     unsigned iold, inew;
 585     MemoryRegionIoeventfd *fd;
 586     MemoryRegionSection section;
 587
 588     /* Generate a symmetric difference of the old and new fd sets, adding
 589      * and deleting as necessary.
 590      */
 591
 592     iold = inew = 0;
 593     while (iold < fds_old_nb || inew < fds_new_nb) {
 594         if (iold < fds_old_nb
 595             && (inew == fds_new_nb
 596                 || memory_region_ioeventfd_before(fds_old[iold],
 597                                                   fds_new[inew]))) {
 598             fd = &fds_old[iold];
 599             section = (MemoryRegionSection) {
 600                 .address_space = as->root,
 601                 .offset_within_address_space = int128_get64(fd->addr.start),
 602                 .size = int128_get64(fd->addr.size),
 603             };
 604             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 605                                  fd->match_data, fd->data, fd->e);
 606             ++iold;
 607         } else if (inew < fds_new_nb
 608                    && (iold == fds_old_nb
 609                        || memory_region_ioeventfd_before(fds_new[inew],
 610                                                          fds_old[iold]))) {
 611             fd = &fds_new[inew];
 612             section = (MemoryRegionSection) {
 613                 .address_space = as->root,
 614                 .offset_within_address_space = int128_get64(fd->addr.start),
 615                 .size = int128_get64(fd->addr.size),
 616             };
 617             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 618                                  fd->match_data, fd->data, fd->e);
 619             ++inew;
 620         } else {
 621             ++iold;
 622             ++inew;
 623         }
 624     }
 625 }
 626
 627 static void address_space_update_ioeventfds(AddressSpace *as)
 628 {
 629     FlatRange *fr;
 630     unsigned ioeventfd_nb = 0;
 631     MemoryRegionIoeventfd *ioeventfds = NULL;
 632     AddrRange tmp;
 633     unsigned i;
 634
 635     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
 636         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 637             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 638                                   int128_sub(fr->addr.start,
 639                                              int128_make64(fr->offset_in_region)));
 640             if (addrrange_intersects(fr->addr, tmp)) {
 641                 ++ioeventfd_nb;
 642                 ioeventfds = g_realloc(ioeventfds,
 643                                           ioeventfd_nb * sizeof(*ioeventfds));
 644                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 645                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 646             }
 647         }
 648     }
 649
 650     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 651                                      as->ioeventfds, as->ioeventfd_nb);
 652
 653     g_free(as->ioeventfds);
 654     as->ioeventfds = ioeventfds;
 655     as->ioeventfd_nb = ioeventfd_nb;
 656 }
 657
 658 static void address_space_update_topology_pass(AddressSpace *as,
 659                                                FlatView old_view,
 660                                                FlatView new_view,
 661                                                bool adding)
 662 {
 663     unsigned iold, inew;
 664     FlatRange *frold, *frnew;
 665
 666     /* Generate a symmetric difference of the old and new memory maps.
 667      * Kill ranges in the old map, and instantiate ranges in the new map.
 668      */
 669     iold = inew = 0;
 670     while (iold < old_view.nr || inew < new_view.nr) {
 671         if (iold < old_view.nr) {
 672             frold = &old_view.ranges[iold];
 673         } else {
 674             frold = NULL;
 675         }
 676         if (inew < new_view.nr) {
 677             frnew = &new_view.ranges[inew];
 678         } else {
 679             frnew = NULL;
 680         }
 681
 682         if (frold
 683             && (!frnew
 684                 || int128_lt(frold->addr.start, frnew->addr.start)
 685                 || (int128_eq(frold->addr.start, frnew->addr.start)
 686                     && !flatrange_equal(frold, frnew)))) {
 687             /* In old, but (not in new, or in new but attributes changed). */
 688
 689             if (!adding) {
 690                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 691             }
 692
 693             ++iold;
 694         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 695             /* In both (logging may have changed) */
 696
 697             if (adding) {
 698                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 699                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 700                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
 701                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 702                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
 703                 }
 704             }
 705
 706             ++iold;
 707             ++inew;
 708         } else {
 709             /* In new */
 710
 711             if (adding) {
 712                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 713             }
 714
 715             ++inew;
 716         }
 717     }
 718 }
 719
 720
 721 static void address_space_update_topology(AddressSpace *as)
 722 {
 723     FlatView old_view = as->current_map;
 724     FlatView new_view = generate_memory_topology(as->root);
 725
 726     address_space_update_topology_pass(as, old_view, new_view, false);
 727     address_space_update_topology_pass(as, old_view, new_view, true);
 728
 729     as->current_map = new_view;
 730     flatview_destroy(&old_view);
 731     address_space_update_ioeventfds(as);
 732 }
 733
 734 void memory_region_transaction_begin(void)
 735 {
 736     qemu_flush_coalesced_mmio_buffer();
 737     ++memory_region_transaction_depth;
 738 }
 739
 740 void memory_region_transaction_commit(void)
 741 {
 742     assert(memory_region_transaction_depth);
 743     --memory_region_transaction_depth;
 744     if (!memory_region_transaction_depth) {
 745         MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 746
 747         if (address_space_memory.root) {
 748             address_space_update_topology(&address_space_memory);
 749         }
 750         if (address_space_io.root) {
 751             address_space_update_topology(&address_space_io);
 752         }
 753
 754         MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 755     }
 756 }
 757
 758 static void memory_region_destructor_none(MemoryRegion *mr)
 759 {
 760 }
 761
 762 static void memory_region_destructor_ram(MemoryRegion *mr)
 763 {
 764     qemu_ram_free(mr->ram_addr);
 765 }
 766
 767 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 768 {
 769     qemu_ram_free_from_ptr(mr->ram_addr);
 770 }
 771
 772 static void memory_region_destructor_iomem(MemoryRegion *mr)
 773 {
 774 }
 775
 776 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 777 {
 778     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 779 }
 780
 781 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 782 {
 783 #ifdef TARGET_WORDS_BIGENDIAN
 784     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 785 #else
 786     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 787 #endif
 788 }
 789
 790 void memory_region_init(MemoryRegion *mr,
 791                         const char *name,
 792                         uint64_t size)
 793 {
 794     mr->ops = NULL;
 795     mr->parent = NULL;
 796     mr->size = int128_make64(size);
 797     if (size == UINT64_MAX) {
 798         mr->size = int128_2_64();
 799     }
 800     mr->addr = 0;
 801     mr->subpage = false;
 802     mr->enabled = true;
 803     mr->terminates = false;
 804     mr->ram = false;
 805     mr->readable = true;
 806     mr->readonly = false;
 807     mr->rom_device = false;
 808     mr->destructor = memory_region_destructor_none;
 809     mr->priority = 0;
 810     mr->may_overlap = false;
 811     mr->alias = NULL;
 812     QTAILQ_INIT(&mr->subregions);
 813     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 814     QTAILQ_INIT(&mr->coalesced);
 815     mr->name = g_strdup(name);
 816     mr->dirty_log_mask = 0;
 817     mr->ioeventfd_nb = 0;
 818     mr->ioeventfds = NULL;
 819     mr->flush_coalesced_mmio = false;
 820 }
 821
 822 static bool memory_region_access_valid(MemoryRegion *mr,
 823                                        target_phys_addr_t addr,
 824                                        unsigned size,
 825                                        bool is_write)
 826 {
 827     if (mr->ops->valid.accepts
 828         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 829         return false;
 830     }
 831
 832     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 833         return false;
 834     }
 835
 836     /* Treat zero as compatibility all valid */
 837     if (!mr->ops->valid.max_access_size) {
 838         return true;
 839     }
 840
 841     if (size > mr->ops->valid.max_access_size
 842         || size < mr->ops->valid.min_access_size) {
 843         return false;
 844     }
 845     return true;
 846 }
 847
 848 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 849                                              target_phys_addr_t addr,
 850                                              unsigned size)
 851 {
 852     uint64_t data = 0;
 853
 854     if (!memory_region_access_valid(mr, addr, size, false)) {
 855         return -1U; /* FIXME: better signalling */
 856     }
 857
 858     if (!mr->ops->read) {
 859         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 860     }
 861
 862     /* FIXME: support unaligned access */
 863     access_with_adjusted_size(addr, &data, size,
 864                               mr->ops->impl.min_access_size,
 865                               mr->ops->impl.max_access_size,
 866                               memory_region_read_accessor, mr);
 867
 868     return data;
 869 }
 870
 871 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 872 {
 873     if (memory_region_wrong_endianness(mr)) {
 874         switch (size) {
 875         case 1:
 876             break;
 877         case 2:
 878             *data = bswap16(*data);
 879             break;
 880         case 4:
 881             *data = bswap32(*data);
 882             break;
 883         default:
 884             abort();
 885         }
 886     }
 887 }
 888
 889 static uint64_t memory_region_dispatch_read(MemoryRegion *mr,
 890                                             target_phys_addr_t addr,
 891                                             unsigned size)
 892 {
 893     uint64_t ret;
 894
 895     ret = memory_region_dispatch_read1(mr, addr, size);
 896     adjust_endianness(mr, &ret, size);
 897     return ret;
 898 }
 899
 900 static void memory_region_dispatch_write(MemoryRegion *mr,
 901                                          target_phys_addr_t addr,
 902                                          uint64_t data,
 903                                          unsigned size)
 904 {
 905     if (!memory_region_access_valid(mr, addr, size, true)) {
 906         return; /* FIXME: better signalling */
 907     }
 908
 909     adjust_endianness(mr, &data, size);
 910
 911     if (!mr->ops->write) {
 912         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 913         return;
 914     }
 915
 916     /* FIXME: support unaligned access */
 917     access_with_adjusted_size(addr, &data, size,
 918                               mr->ops->impl.min_access_size,
 919                               mr->ops->impl.max_access_size,
 920                               memory_region_write_accessor, mr);
 921 }
 922
 923 void memory_region_init_io(MemoryRegion *mr,
 924                            const MemoryRegionOps *ops,
 925                            void *opaque,
 926                            const char *name,
 927                            uint64_t size)
 928 {
 929     memory_region_init(mr, name, size);
 930     mr->ops = ops;
 931     mr->opaque = opaque;
 932     mr->terminates = true;
 933     mr->destructor = memory_region_destructor_iomem;
 934     mr->ram_addr = ~(ram_addr_t)0;
 935 }
 936
 937 void memory_region_init_ram(MemoryRegion *mr,
 938                             const char *name,
 939                             uint64_t size)
 940 {
 941     memory_region_init(mr, name, size);
 942     mr->ram = true;
 943     mr->terminates = true;
 944     mr->destructor = memory_region_destructor_ram;
 945     mr->ram_addr = qemu_ram_alloc(size, mr);
 946 }
 947
 948 void memory_region_init_ram_ptr(MemoryRegion *mr,
 949                                 const char *name,
 950                                 uint64_t size,
 951                                 void *ptr)
 952 {
 953     memory_region_init(mr, name, size);
 954     mr->ram = true;
 955     mr->terminates = true;
 956     mr->destructor = memory_region_destructor_ram_from_ptr;
 957     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
 958 }
 959
 960 void memory_region_init_alias(MemoryRegion *mr,
 961                               const char *name,
 962                               MemoryRegion *orig,
 963                               target_phys_addr_t offset,
 964                               uint64_t size)
 965 {
 966     memory_region_init(mr, name, size);
 967     mr->alias = orig;
 968     mr->alias_offset = offset;
 969 }
 970
 971 void memory_region_init_rom_device(MemoryRegion *mr,
 972                                    const MemoryRegionOps *ops,
 973                                    void *opaque,
 974                                    const char *name,
 975                                    uint64_t size)
 976 {
 977     memory_region_init(mr, name, size);
 978     mr->ops = ops;
 979     mr->opaque = opaque;
 980     mr->terminates = true;
 981     mr->rom_device = true;
 982     mr->destructor = memory_region_destructor_rom_device;
 983     mr->ram_addr = qemu_ram_alloc(size, mr);
 984 }
 985
 986 static uint64_t invalid_read(void *opaque, target_phys_addr_t addr,
 987                              unsigned size)
 988 {
 989     MemoryRegion *mr = opaque;
 990
 991     if (!mr->warning_printed) {
 992         fprintf(stderr, "Invalid read from memory region %s\n", mr->name);
 993         mr->warning_printed = true;
 994     }
 995     return -1U;
 996 }
 997
 998 static void invalid_write(void *opaque, target_phys_addr_t addr, uint64_t data,
 999                           unsigned size)
1000 {
1001     MemoryRegion *mr = opaque;
1002
1003     if (!mr->warning_printed) {
1004         fprintf(stderr, "Invalid write to memory region %s\n", mr->name);
1005         mr->warning_printed = true;
1006     }
1007 }
1008
1009 static const MemoryRegionOps reservation_ops = {
1010     .read = invalid_read,
1011     .write = invalid_write,
1012     .endianness = DEVICE_NATIVE_ENDIAN,
1013 };
1014
1015 void memory_region_init_reservation(MemoryRegion *mr,
1016                                     const char *name,
1017                                     uint64_t size)
1018 {
1019     memory_region_init_io(mr, &reservation_ops, mr, name, size);
1020 }
1021
1022 void memory_region_destroy(MemoryRegion *mr)
1023 {
1024     assert(QTAILQ_EMPTY(&mr->subregions));
1025     mr->destructor(mr);
1026     memory_region_clear_coalescing(mr);
1027     g_free((char *)mr->name);
1028     g_free(mr->ioeventfds);
1029 }
1030
1031 uint64_t memory_region_size(MemoryRegion *mr)
1032 {
1033     if (int128_eq(mr->size, int128_2_64())) {
1034         return UINT64_MAX;
1035     }
1036     return int128_get64(mr->size);
1037 }
1038
1039 const char *memory_region_name(MemoryRegion *mr)
1040 {
1041     return mr->name;
1042 }
1043
1044 bool memory_region_is_ram(MemoryRegion *mr)
1045 {
1046     return mr->ram;
1047 }
1048
1049 bool memory_region_is_logging(MemoryRegion *mr)
1050 {
1051     return mr->dirty_log_mask;
1052 }
1053
1054 bool memory_region_is_rom(MemoryRegion *mr)
1055 {
1056     return mr->ram && mr->readonly;
1057 }
1058
1059 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1060 {
1061     uint8_t mask = 1 << client;
1062
1063     memory_region_transaction_begin();
1064     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1065     memory_region_transaction_commit();
1066 }
1067
1068 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1069                              target_phys_addr_t size, unsigned client)
1070 {
1071     assert(mr->terminates);
1072     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1073                                          1 << client);
1074 }
1075
1076 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1077                              target_phys_addr_t size)
1078 {
1079     assert(mr->terminates);
1080     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1081 }
1082
1083 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1084 {
1085     FlatRange *fr;
1086
1087     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1088         if (fr->mr == mr) {
1089             MEMORY_LISTENER_UPDATE_REGION(fr, &address_space_memory,
1090                                           Forward, log_sync);
1091         }
1092     }
1093 }
1094
1095 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1096 {
1097     if (mr->readonly != readonly) {
1098         memory_region_transaction_begin();
1099         mr->readonly = readonly;
1100         memory_region_transaction_commit();
1101     }
1102 }
1103
1104 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1105 {
1106     if (mr->readable != readable) {
1107         memory_region_transaction_begin();
1108         mr->readable = readable;
1109         memory_region_transaction_commit();
1110     }
1111 }
1112
1113 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1114                                target_phys_addr_t size, unsigned client)
1115 {
1116     assert(mr->terminates);
1117     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1118                                     mr->ram_addr + addr + size,
1119                                     1 << client);
1120 }
1121
1122 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1123 {
1124     if (mr->alias) {
1125         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1126     }
1127
1128     assert(mr->terminates);
1129
1130     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1131 }
1132
1133 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1134 {
1135     FlatRange *fr;
1136     CoalescedMemoryRange *cmr;
1137     AddrRange tmp;
1138
1139     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1140         if (fr->mr == mr) {
1141             qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
1142                                            int128_get64(fr->addr.size));
1143             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1144                 tmp = addrrange_shift(cmr->addr,
1145                                       int128_sub(fr->addr.start,
1146                                                  int128_make64(fr->offset_in_region)));
1147                 if (!addrrange_intersects(tmp, fr->addr)) {
1148                     continue;
1149                 }
1150                 tmp = addrrange_intersection(tmp, fr->addr);
1151                 qemu_register_coalesced_mmio(int128_get64(tmp.start),
1152                                              int128_get64(tmp.size));
1153             }
1154         }
1155     }
1156 }
1157
1158 void memory_region_set_coalescing(MemoryRegion *mr)
1159 {
1160     memory_region_clear_coalescing(mr);
1161     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1162 }
1163
1164 void memory_region_add_coalescing(MemoryRegion *mr,
1165                                   target_phys_addr_t offset,
1166                                   uint64_t size)
1167 {
1168     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1169
1170     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1171     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1172     memory_region_update_coalesced_range(mr);
1173     memory_region_set_flush_coalesced(mr);
1174 }
1175
1176 void memory_region_clear_coalescing(MemoryRegion *mr)
1177 {
1178     CoalescedMemoryRange *cmr;
1179
1180     qemu_flush_coalesced_mmio_buffer();
1181     mr->flush_coalesced_mmio = false;
1182
1183     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1184         cmr = QTAILQ_FIRST(&mr->coalesced);
1185         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1186         g_free(cmr);
1187     }
1188     memory_region_update_coalesced_range(mr);
1189 }
1190
1191 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1192 {
1193     mr->flush_coalesced_mmio = true;
1194 }
1195
1196 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1197 {
1198     qemu_flush_coalesced_mmio_buffer();
1199     if (QTAILQ_EMPTY(&mr->coalesced)) {
1200         mr->flush_coalesced_mmio = false;
1201     }
1202 }
1203
1204 void memory_region_add_eventfd(MemoryRegion *mr,
1205                                target_phys_addr_t addr,
1206                                unsigned size,
1207                                bool match_data,
1208                                uint64_t data,
1209                                EventNotifier *e)
1210 {
1211     MemoryRegionIoeventfd mrfd = {
1212         .addr.start = int128_make64(addr),
1213         .addr.size = int128_make64(size),
1214         .match_data = match_data,
1215         .data = data,
1216         .e = e,
1217     };
1218     unsigned i;
1219
1220     adjust_endianness(mr, &mrfd.data, size);
1221     memory_region_transaction_begin();
1222     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1223         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1224             break;
1225         }
1226     }
1227     ++mr->ioeventfd_nb;
1228     mr->ioeventfds = g_realloc(mr->ioeventfds,
1229                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1230     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1231             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1232     mr->ioeventfds[i] = mrfd;
1233     memory_region_transaction_commit();
1234 }
1235
1236 void memory_region_del_eventfd(MemoryRegion *mr,
1237                                target_phys_addr_t addr,
1238                                unsigned size,
1239                                bool match_data,
1240                                uint64_t data,
1241                                EventNotifier *e)
1242 {
1243     MemoryRegionIoeventfd mrfd = {
1244         .addr.start = int128_make64(addr),
1245         .addr.size = int128_make64(size),
1246         .match_data = match_data,
1247         .data = data,
1248         .e = e,
1249     };
1250     unsigned i;
1251
1252     adjust_endianness(mr, &mrfd.data, size);
1253     memory_region_transaction_begin();
1254     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1255         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1256             break;
1257         }
1258     }
1259     assert(i != mr->ioeventfd_nb);
1260     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1261             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1262     --mr->ioeventfd_nb;
1263     mr->ioeventfds = g_realloc(mr->ioeventfds,
1264                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1265     memory_region_transaction_commit();
1266 }
1267
1268 static void memory_region_add_subregion_common(MemoryRegion *mr,
1269                                                target_phys_addr_t offset,
1270                                                MemoryRegion *subregion)
1271 {
1272     MemoryRegion *other;
1273
1274     memory_region_transaction_begin();
1275
1276     assert(!subregion->parent);
1277     subregion->parent = mr;
1278     subregion->addr = offset;
1279     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1280         if (subregion->may_overlap || other->may_overlap) {
1281             continue;
1282         }
1283         if (int128_gt(int128_make64(offset),
1284                       int128_add(int128_make64(other->addr), other->size))
1285             || int128_le(int128_add(int128_make64(offset), subregion->size),
1286                          int128_make64(other->addr))) {
1287             continue;
1288         }
1289 #if 0
1290         printf("warning: subregion collision %llx/%llx (%s) "
1291                "vs %llx/%llx (%s)\n",
1292                (unsigned long long)offset,
1293                (unsigned long long)int128_get64(subregion->size),
1294                subregion->name,
1295                (unsigned long long)other->addr,
1296                (unsigned long long)int128_get64(other->size),
1297                other->name);
1298 #endif
1299     }
1300     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1301         if (subregion->priority >= other->priority) {
1302             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1303             goto done;
1304         }
1305     }
1306     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1307 done:
1308     memory_region_transaction_commit();
1309 }
1310
1311
1312 void memory_region_add_subregion(MemoryRegion *mr,
1313                                  target_phys_addr_t offset,
1314                                  MemoryRegion *subregion)
1315 {
1316     subregion->may_overlap = false;
1317     subregion->priority = 0;
1318     memory_region_add_subregion_common(mr, offset, subregion);
1319 }
1320
1321 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1322                                          target_phys_addr_t offset,
1323                                          MemoryRegion *subregion,
1324                                          unsigned priority)
1325 {
1326     subregion->may_overlap = true;
1327     subregion->priority = priority;
1328     memory_region_add_subregion_common(mr, offset, subregion);
1329 }
1330
1331 void memory_region_del_subregion(MemoryRegion *mr,
1332                                  MemoryRegion *subregion)
1333 {
1334     memory_region_transaction_begin();
1335     assert(subregion->parent == mr);
1336     subregion->parent = NULL;
1337     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1338     memory_region_transaction_commit();
1339 }
1340
1341 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1342 {
1343     if (enabled == mr->enabled) {
1344         return;
1345     }
1346     memory_region_transaction_begin();
1347     mr->enabled = enabled;
1348     memory_region_transaction_commit();
1349 }
1350
1351 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
1352 {
1353     MemoryRegion *parent = mr->parent;
1354     unsigned priority = mr->priority;
1355     bool may_overlap = mr->may_overlap;
1356
1357     if (addr == mr->addr || !parent) {
1358         mr->addr = addr;
1359         return;
1360     }
1361
1362     memory_region_transaction_begin();
1363     memory_region_del_subregion(parent, mr);
1364     if (may_overlap) {
1365         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1366     } else {
1367         memory_region_add_subregion(parent, addr, mr);
1368     }
1369     memory_region_transaction_commit();
1370 }
1371
1372 void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
1373 {
1374     assert(mr->alias);
1375
1376     if (offset == mr->alias_offset) {
1377         return;
1378     }
1379
1380     memory_region_transaction_begin();
1381     mr->alias_offset = offset;
1382     memory_region_transaction_commit();
1383 }
1384
1385 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1386 {
1387     return mr->ram_addr;
1388 }
1389
1390 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1391 {
1392     const AddrRange *addr = addr_;
1393     const FlatRange *fr = fr_;
1394
1395     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1396         return -1;
1397     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1398         return 1;
1399     }
1400     return 0;
1401 }
1402
1403 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1404 {
1405     return bsearch(&addr, as->current_map.ranges, as->current_map.nr,
1406                    sizeof(FlatRange), cmp_flatrange_addr);
1407 }
1408
1409 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1410                                        target_phys_addr_t addr, uint64_t size)
1411 {
1412     AddressSpace *as = memory_region_to_address_space(address_space);
1413     AddrRange range = addrrange_make(int128_make64(addr),
1414                                      int128_make64(size));
1415     FlatRange *fr = address_space_lookup(as, range);
1416     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1417
1418     if (!fr) {
1419         return ret;
1420     }
1421
1422     while (fr > as->current_map.ranges
1423            && addrrange_intersects(fr[-1].addr, range)) {
1424         --fr;
1425     }
1426
1427     ret.mr = fr->mr;
1428     range = addrrange_intersection(range, fr->addr);
1429     ret.offset_within_region = fr->offset_in_region;
1430     ret.offset_within_region += int128_get64(int128_sub(range.start,
1431                                                         fr->addr.start));
1432     ret.size = int128_get64(range.size);
1433     ret.offset_within_address_space = int128_get64(range.start);
1434     ret.readonly = fr->readonly;
1435     return ret;
1436 }
1437
1438 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1439 {
1440     AddressSpace *as = memory_region_to_address_space(address_space);
1441     FlatRange *fr;
1442
1443     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1444         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1445     }
1446 }
1447
1448 void memory_global_dirty_log_start(void)
1449 {
1450     global_dirty_log = true;
1451     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1452 }
1453
1454 void memory_global_dirty_log_stop(void)
1455 {
1456     global_dirty_log = false;
1457     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1458 }
1459
1460 static void listener_add_address_space(MemoryListener *listener,
1461                                        AddressSpace *as)
1462 {
1463     FlatRange *fr;
1464
1465     if (listener->address_space_filter
1466         && listener->address_space_filter != as->root) {
1467         return;
1468     }
1469
1470     if (global_dirty_log) {
1471         listener->log_global_start(listener);
1472     }
1473     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1474         MemoryRegionSection section = {
1475             .mr = fr->mr,
1476             .address_space = as->root,
1477             .offset_within_region = fr->offset_in_region,
1478             .size = int128_get64(fr->addr.size),
1479             .offset_within_address_space = int128_get64(fr->addr.start),
1480             .readonly = fr->readonly,
1481         };
1482         listener->region_add(listener, &section);
1483     }
1484 }
1485
1486 void memory_listener_register(MemoryListener *listener, MemoryRegion *filter)
1487 {
1488     MemoryListener *other = NULL;
1489
1490     listener->address_space_filter = filter;
1491     if (QTAILQ_EMPTY(&memory_listeners)
1492         || listener->priority >= QTAILQ_LAST(&memory_listeners,
1493                                              memory_listeners)->priority) {
1494         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1495     } else {
1496         QTAILQ_FOREACH(other, &memory_listeners, link) {
1497             if (listener->priority < other->priority) {
1498                 break;
1499             }
1500         }
1501         QTAILQ_INSERT_BEFORE(other, listener, link);
1502     }
1503     listener_add_address_space(listener, &address_space_memory);
1504     listener_add_address_space(listener, &address_space_io);
1505 }
1506
1507 void memory_listener_unregister(MemoryListener *listener)
1508 {
1509     QTAILQ_REMOVE(&memory_listeners, listener, link);
1510 }
1511
1512 void set_system_memory_map(MemoryRegion *mr)
1513 {
1514     memory_region_transaction_begin();
1515     address_space_memory.root = mr;
1516     memory_region_transaction_commit();
1517 }
1518
1519 void set_system_io_map(MemoryRegion *mr)
1520 {
1521     memory_region_transaction_begin();
1522     address_space_io.root = mr;
1523     memory_region_transaction_commit();
1524 }
1525
1526 uint64_t io_mem_read(MemoryRegion *mr, target_phys_addr_t addr, unsigned size)
1527 {
1528     return memory_region_dispatch_read(mr, addr, size);
1529 }
1530
1531 void io_mem_write(MemoryRegion *mr, target_phys_addr_t addr,
1532                   uint64_t val, unsigned size)
1533 {
1534     memory_region_dispatch_write(mr, addr, val, size);
1535 }
1536
1537 typedef struct MemoryRegionList MemoryRegionList;
1538
1539 struct MemoryRegionList {
1540     const MemoryRegion *mr;
1541     bool printed;
1542     QTAILQ_ENTRY(MemoryRegionList) queue;
1543 };
1544
1545 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1546
1547 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1548                            const MemoryRegion *mr, unsigned int level,
1549                            target_phys_addr_t base,
1550                            MemoryRegionListHead *alias_print_queue)
1551 {
1552     MemoryRegionList *new_ml, *ml, *next_ml;
1553     MemoryRegionListHead submr_print_queue;
1554     const MemoryRegion *submr;
1555     unsigned int i;
1556
1557     if (!mr) {
1558         return;
1559     }
1560
1561     for (i = 0; i < level; i++) {
1562         mon_printf(f, "  ");
1563     }
1564
1565     if (mr->alias) {
1566         MemoryRegionList *ml;
1567         bool found = false;
1568
1569         /* check if the alias is already in the queue */
1570         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1571             if (ml->mr == mr->alias && !ml->printed) {
1572                 found = true;
1573             }
1574         }
1575
1576         if (!found) {
1577             ml = g_new(MemoryRegionList, 1);
1578             ml->mr = mr->alias;
1579             ml->printed = false;
1580             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1581         }
1582         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
1583                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
1584                    "-" TARGET_FMT_plx "\n",
1585                    base + mr->addr,
1586                    base + mr->addr
1587                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1588                    mr->priority,
1589                    mr->readable ? 'R' : '-',
1590                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1591                                                                       : '-',
1592                    mr->name,
1593                    mr->alias->name,
1594                    mr->alias_offset,
1595                    mr->alias_offset
1596                    + (target_phys_addr_t)int128_get64(mr->size) - 1);
1597     } else {
1598         mon_printf(f,
1599                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
1600                    base + mr->addr,
1601                    base + mr->addr
1602                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1603                    mr->priority,
1604                    mr->readable ? 'R' : '-',
1605                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1606                                                                       : '-',
1607                    mr->name);
1608     }
1609
1610     QTAILQ_INIT(&submr_print_queue);
1611
1612     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1613         new_ml = g_new(MemoryRegionList, 1);
1614         new_ml->mr = submr;
1615         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1616             if (new_ml->mr->addr < ml->mr->addr ||
1617                 (new_ml->mr->addr == ml->mr->addr &&
1618                  new_ml->mr->priority > ml->mr->priority)) {
1619                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1620                 new_ml = NULL;
1621                 break;
1622             }
1623         }
1624         if (new_ml) {
1625             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1626         }
1627     }
1628
1629     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1630         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1631                        alias_print_queue);
1632     }
1633
1634     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1635         g_free(ml);
1636     }
1637 }
1638
1639 void mtree_info(fprintf_function mon_printf, void *f)
1640 {
1641     MemoryRegionListHead ml_head;
1642     MemoryRegionList *ml, *ml2;
1643
1644     QTAILQ_INIT(&ml_head);
1645
1646     mon_printf(f, "memory\n");
1647     mtree_print_mr(mon_printf, f, address_space_memory.root, 0, 0, &ml_head);
1648
1649     if (address_space_io.root &&
1650         !QTAILQ_EMPTY(&address_space_io.root->subregions)) {
1651         mon_printf(f, "I/O\n");
1652         mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
1653     }
1654
1655     mon_printf(f, "aliases\n");
1656     /* print aliased regions */
1657     QTAILQ_FOREACH(ml, &ml_head, queue) {
1658         if (!ml->printed) {
1659             mon_printf(f, "%s\n", ml->mr->name);
1660             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1661         }
1662     }
1663
1664     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1665         g_free(ml);
1666     }
1667 }