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  */
  13
  14 #include "memory.h"
  15 #include "exec-memory.h"
  16 #include "ioport.h"
  17 #include "bitops.h"
  18 #include "kvm.h"
  19 #include <assert.h>
  20
  21 #define WANT_EXEC_OBSOLETE
  22 #include "exec-obsolete.h"
  23
  24 unsigned memory_region_transaction_depth = 0;
  25 static bool memory_region_update_pending = false;
  26 static bool global_dirty_log = false;
  27
  28 static QLIST_HEAD(, MemoryListener) memory_listeners
  29     = QLIST_HEAD_INITIALIZER(memory_listeners);
  30
  31 typedef struct AddrRange AddrRange;
  32
  33 /*
  34  * Note using signed integers limits us to physical addresses at most
  35  * 63 bits wide.  They are needed for negative offsetting in aliases
  36  * (large MemoryRegion::alias_offset).
  37  */
  38 struct AddrRange {
  39     Int128 start;
  40     Int128 size;
  41 };
  42
  43 static AddrRange addrrange_make(Int128 start, Int128 size)
  44 {
  45     return (AddrRange) { start, size };
  46 }
  47
  48 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  49 {
  50     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  51 }
  52
  53 static Int128 addrrange_end(AddrRange r)
  54 {
  55     return int128_add(r.start, r.size);
  56 }
  57
  58 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  59 {
  60     int128_addto(&range.start, delta);
  61     return range;
  62 }
  63
  64 static bool addrrange_contains(AddrRange range, Int128 addr)
  65 {
  66     return int128_ge(addr, range.start)
  67         && int128_lt(addr, addrrange_end(range));
  68 }
  69
  70 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  71 {
  72     return addrrange_contains(r1, r2.start)
  73         || addrrange_contains(r2, r1.start);
  74 }
  75
  76 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  77 {
  78     Int128 start = int128_max(r1.start, r2.start);
  79     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  80     return addrrange_make(start, int128_sub(end, start));
  81 }
  82
  83 struct CoalescedMemoryRange {
  84     AddrRange addr;
  85     QTAILQ_ENTRY(CoalescedMemoryRange) link;
  86 };
  87
  88 struct MemoryRegionIoeventfd {
  89     AddrRange addr;
  90     bool match_data;
  91     uint64_t data;
  92     int fd;
  93 };
  94
  95 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
  96                                            MemoryRegionIoeventfd b)
  97 {
  98     if (int128_lt(a.addr.start, b.addr.start)) {
  99         return true;
 100     } else if (int128_gt(a.addr.start, b.addr.start)) {
 101         return false;
 102     } else if (int128_lt(a.addr.size, b.addr.size)) {
 103         return true;
 104     } else if (int128_gt(a.addr.size, b.addr.size)) {
 105         return false;
 106     } else if (a.match_data < b.match_data) {
 107         return true;
 108     } else  if (a.match_data > b.match_data) {
 109         return false;
 110     } else if (a.match_data) {
 111         if (a.data < b.data) {
 112             return true;
 113         } else if (a.data > b.data) {
 114             return false;
 115         }
 116     }
 117     if (a.fd < b.fd) {
 118         return true;
 119     } else if (a.fd > b.fd) {
 120         return false;
 121     }
 122     return false;
 123 }
 124
 125 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 126                                           MemoryRegionIoeventfd b)
 127 {
 128     return !memory_region_ioeventfd_before(a, b)
 129         && !memory_region_ioeventfd_before(b, a);
 130 }
 131
 132 typedef struct FlatRange FlatRange;
 133 typedef struct FlatView FlatView;
 134
 135 /* Range of memory in the global map.  Addresses are absolute. */
 136 struct FlatRange {
 137     MemoryRegion *mr;
 138     target_phys_addr_t offset_in_region;
 139     AddrRange addr;
 140     uint8_t dirty_log_mask;
 141     bool readable;
 142     bool readonly;
 143 };
 144
 145 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 146  * order.
 147  */
 148 struct FlatView {
 149     FlatRange *ranges;
 150     unsigned nr;
 151     unsigned nr_allocated;
 152 };
 153
 154 typedef struct AddressSpace AddressSpace;
 155 typedef struct AddressSpaceOps AddressSpaceOps;
 156
 157 /* A system address space - I/O, memory, etc. */
 158 struct AddressSpace {
 159     const AddressSpaceOps *ops;
 160     MemoryRegion *root;
 161     FlatView current_map;
 162     int ioeventfd_nb;
 163     MemoryRegionIoeventfd *ioeventfds;
 164 };
 165
 166 struct AddressSpaceOps {
 167     void (*range_add)(AddressSpace *as, FlatRange *fr);
 168     void (*range_del)(AddressSpace *as, FlatRange *fr);
 169     void (*log_start)(AddressSpace *as, FlatRange *fr);
 170     void (*log_stop)(AddressSpace *as, FlatRange *fr);
 171     void (*ioeventfd_add)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 172     void (*ioeventfd_del)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 173 };
 174
 175 #define FOR_EACH_FLAT_RANGE(var, view)          \
 176     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 177
 178 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 179 {
 180     return a->mr == b->mr
 181         && addrrange_equal(a->addr, b->addr)
 182         && a->offset_in_region == b->offset_in_region
 183         && a->readable == b->readable
 184         && a->readonly == b->readonly;
 185 }
 186
 187 static void flatview_init(FlatView *view)
 188 {
 189     view->ranges = NULL;
 190     view->nr = 0;
 191     view->nr_allocated = 0;
 192 }
 193
 194 /* Insert a range into a given position.  Caller is responsible for maintaining
 195  * sorting order.
 196  */
 197 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 198 {
 199     if (view->nr == view->nr_allocated) {
 200         view->nr_allocated = MAX(2 * view->nr, 10);
 201         view->ranges = g_realloc(view->ranges,
 202                                     view->nr_allocated * sizeof(*view->ranges));
 203     }
 204     memmove(view->ranges + pos + 1, view->ranges + pos,
 205             (view->nr - pos) * sizeof(FlatRange));
 206     view->ranges[pos] = *range;
 207     ++view->nr;
 208 }
 209
 210 static void flatview_destroy(FlatView *view)
 211 {
 212     g_free(view->ranges);
 213 }
 214
 215 static bool can_merge(FlatRange *r1, FlatRange *r2)
 216 {
 217     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 218         && r1->mr == r2->mr
 219         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 220                                 r1->addr.size),
 221                      int128_make64(r2->offset_in_region))
 222         && r1->dirty_log_mask == r2->dirty_log_mask
 223         && r1->readable == r2->readable
 224         && r1->readonly == r2->readonly;
 225 }
 226
 227 /* Attempt to simplify a view by merging ajacent ranges */
 228 static void flatview_simplify(FlatView *view)
 229 {
 230     unsigned i, j;
 231
 232     i = 0;
 233     while (i < view->nr) {
 234         j = i + 1;
 235         while (j < view->nr
 236                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 237             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 238             ++j;
 239         }
 240         ++i;
 241         memmove(&view->ranges[i], &view->ranges[j],
 242                 (view->nr - j) * sizeof(view->ranges[j]));
 243         view->nr -= j - i;
 244     }
 245 }
 246
 247 static void memory_region_read_accessor(void *opaque,
 248                                         target_phys_addr_t addr,
 249                                         uint64_t *value,
 250                                         unsigned size,
 251                                         unsigned shift,
 252                                         uint64_t mask)
 253 {
 254     MemoryRegion *mr = opaque;
 255     uint64_t tmp;
 256
 257     tmp = mr->ops->read(mr->opaque, addr, size);
 258     *value |= (tmp & mask) << shift;
 259 }
 260
 261 static void memory_region_write_accessor(void *opaque,
 262                                          target_phys_addr_t addr,
 263                                          uint64_t *value,
 264                                          unsigned size,
 265                                          unsigned shift,
 266                                          uint64_t mask)
 267 {
 268     MemoryRegion *mr = opaque;
 269     uint64_t tmp;
 270
 271     tmp = (*value >> shift) & mask;
 272     mr->ops->write(mr->opaque, addr, tmp, size);
 273 }
 274
 275 static void access_with_adjusted_size(target_phys_addr_t addr,
 276                                       uint64_t *value,
 277                                       unsigned size,
 278                                       unsigned access_size_min,
 279                                       unsigned access_size_max,
 280                                       void (*access)(void *opaque,
 281                                                      target_phys_addr_t addr,
 282                                                      uint64_t *value,
 283                                                      unsigned size,
 284                                                      unsigned shift,
 285                                                      uint64_t mask),
 286                                       void *opaque)
 287 {
 288     uint64_t access_mask;
 289     unsigned access_size;
 290     unsigned i;
 291
 292     if (!access_size_min) {
 293         access_size_min = 1;
 294     }
 295     if (!access_size_max) {
 296         access_size_max = 4;
 297     }
 298     access_size = MAX(MIN(size, access_size_max), access_size_min);
 299     access_mask = -1ULL >> (64 - access_size * 8);
 300     for (i = 0; i < size; i += access_size) {
 301         /* FIXME: big-endian support */
 302         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 303     }
 304 }
 305
 306 static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
 307 {
 308     MemoryRegionSection section = {
 309         .mr = fr->mr,
 310         .offset_within_address_space = int128_get64(fr->addr.start),
 311         .offset_within_region = fr->offset_in_region,
 312         .size = int128_get64(fr->addr.size),
 313     };
 314
 315     cpu_register_physical_memory_log(&section, fr->readable, fr->readonly);
 316 }
 317
 318 static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
 319 {
 320     MemoryRegionSection section = {
 321         .mr = &io_mem_unassigned,
 322         .offset_within_address_space = int128_get64(fr->addr.start),
 323         .offset_within_region = int128_get64(fr->addr.start),
 324         .size = int128_get64(fr->addr.size),
 325     };
 326
 327     cpu_register_physical_memory_log(&section, true, false);
 328 }
 329
 330 static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
 331 {
 332 }
 333
 334 static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
 335 {
 336 }
 337
 338 static void as_memory_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 339 {
 340     int r;
 341
 342     assert(fd->match_data && int128_get64(fd->addr.size) == 4);
 343
 344     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 345                                     fd->data, true);
 346     if (r < 0) {
 347         abort();
 348     }
 349 }
 350
 351 static void as_memory_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 352 {
 353     int r;
 354
 355     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 356                                     fd->data, false);
 357     if (r < 0) {
 358         abort();
 359     }
 360 }
 361
 362 static const AddressSpaceOps address_space_ops_memory = {
 363     .range_add = as_memory_range_add,
 364     .range_del = as_memory_range_del,
 365     .log_start = as_memory_log_start,
 366     .log_stop = as_memory_log_stop,
 367     .ioeventfd_add = as_memory_ioeventfd_add,
 368     .ioeventfd_del = as_memory_ioeventfd_del,
 369 };
 370
 371 static AddressSpace address_space_memory = {
 372     .ops = &address_space_ops_memory,
 373 };
 374
 375 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 376                                              unsigned width, bool write)
 377 {
 378     const MemoryRegionPortio *mrp;
 379
 380     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 381         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 382             && width == mrp->size
 383             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 384             return mrp;
 385         }
 386     }
 387     return NULL;
 388 }
 389
 390 static void memory_region_iorange_read(IORange *iorange,
 391                                        uint64_t offset,
 392                                        unsigned width,
 393                                        uint64_t *data)
 394 {
 395     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 396
 397     if (mr->ops->old_portio) {
 398         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, false);
 399
 400         *data = ((uint64_t)1 << (width * 8)) - 1;
 401         if (mrp) {
 402             *data = mrp->read(mr->opaque, offset + mr->offset);
 403         } else if (width == 2) {
 404             mrp = find_portio(mr, offset, 1, false);
 405             assert(mrp);
 406             *data = mrp->read(mr->opaque, offset + mr->offset) |
 407                     (mrp->read(mr->opaque, offset + mr->offset + 1) << 8);
 408         }
 409         return;
 410     }
 411     *data = 0;
 412     access_with_adjusted_size(offset + mr->offset, data, width,
 413                               mr->ops->impl.min_access_size,
 414                               mr->ops->impl.max_access_size,
 415                               memory_region_read_accessor, mr);
 416 }
 417
 418 static void memory_region_iorange_write(IORange *iorange,
 419                                         uint64_t offset,
 420                                         unsigned width,
 421                                         uint64_t data)
 422 {
 423     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 424
 425     if (mr->ops->old_portio) {
 426         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, true);
 427
 428         if (mrp) {
 429             mrp->write(mr->opaque, offset + mr->offset, data);
 430         } else if (width == 2) {
 431             mrp = find_portio(mr, offset, 1, false);
 432             assert(mrp);
 433             mrp->write(mr->opaque, offset + mr->offset, data & 0xff);
 434             mrp->write(mr->opaque, offset + mr->offset + 1, data >> 8);
 435         }
 436         return;
 437     }
 438     access_with_adjusted_size(offset + mr->offset, &data, width,
 439                               mr->ops->impl.min_access_size,
 440                               mr->ops->impl.max_access_size,
 441                               memory_region_write_accessor, mr);
 442 }
 443
 444 static const IORangeOps memory_region_iorange_ops = {
 445     .read = memory_region_iorange_read,
 446     .write = memory_region_iorange_write,
 447 };
 448
 449 static void as_io_range_add(AddressSpace *as, FlatRange *fr)
 450 {
 451     iorange_init(&fr->mr->iorange, &memory_region_iorange_ops,
 452                  int128_get64(fr->addr.start), int128_get64(fr->addr.size));
 453     ioport_register(&fr->mr->iorange);
 454 }
 455
 456 static void as_io_range_del(AddressSpace *as, FlatRange *fr)
 457 {
 458     isa_unassign_ioport(int128_get64(fr->addr.start),
 459                         int128_get64(fr->addr.size));
 460 }
 461
 462 static void as_io_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 463 {
 464     int r;
 465
 466     assert(fd->match_data && int128_get64(fd->addr.size) == 2);
 467
 468     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 469                                    fd->data, true);
 470     if (r < 0) {
 471         abort();
 472     }
 473 }
 474
 475 static void as_io_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 476 {
 477     int r;
 478
 479     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 480                                    fd->data, false);
 481     if (r < 0) {
 482         abort();
 483     }
 484 }
 485
 486 static const AddressSpaceOps address_space_ops_io = {
 487     .range_add = as_io_range_add,
 488     .range_del = as_io_range_del,
 489     .ioeventfd_add = as_io_ioeventfd_add,
 490     .ioeventfd_del = as_io_ioeventfd_del,
 491 };
 492
 493 static AddressSpace address_space_io = {
 494     .ops = &address_space_ops_io,
 495 };
 496
 497 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 498 {
 499     while (mr->parent) {
 500         mr = mr->parent;
 501     }
 502     if (mr == address_space_memory.root) {
 503         return &address_space_memory;
 504     }
 505     if (mr == address_space_io.root) {
 506         return &address_space_io;
 507     }
 508     abort();
 509 }
 510
 511 /* Render a memory region into the global view.  Ranges in @view obscure
 512  * ranges in @mr.
 513  */
 514 static void render_memory_region(FlatView *view,
 515                                  MemoryRegion *mr,
 516                                  Int128 base,
 517                                  AddrRange clip,
 518                                  bool readonly)
 519 {
 520     MemoryRegion *subregion;
 521     unsigned i;
 522     target_phys_addr_t offset_in_region;
 523     Int128 remain;
 524     Int128 now;
 525     FlatRange fr;
 526     AddrRange tmp;
 527
 528     if (!mr->enabled) {
 529         return;
 530     }
 531
 532     int128_addto(&base, int128_make64(mr->addr));
 533     readonly |= mr->readonly;
 534
 535     tmp = addrrange_make(base, mr->size);
 536
 537     if (!addrrange_intersects(tmp, clip)) {
 538         return;
 539     }
 540
 541     clip = addrrange_intersection(tmp, clip);
 542
 543     if (mr->alias) {
 544         int128_subfrom(&base, int128_make64(mr->alias->addr));
 545         int128_subfrom(&base, int128_make64(mr->alias_offset));
 546         render_memory_region(view, mr->alias, base, clip, readonly);
 547         return;
 548     }
 549
 550     /* Render subregions in priority order. */
 551     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 552         render_memory_region(view, subregion, base, clip, readonly);
 553     }
 554
 555     if (!mr->terminates) {
 556         return;
 557     }
 558
 559     offset_in_region = int128_get64(int128_sub(clip.start, base));
 560     base = clip.start;
 561     remain = clip.size;
 562
 563     /* Render the region itself into any gaps left by the current view. */
 564     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 565         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 566             continue;
 567         }
 568         if (int128_lt(base, view->ranges[i].addr.start)) {
 569             now = int128_min(remain,
 570                              int128_sub(view->ranges[i].addr.start, base));
 571             fr.mr = mr;
 572             fr.offset_in_region = offset_in_region;
 573             fr.addr = addrrange_make(base, now);
 574             fr.dirty_log_mask = mr->dirty_log_mask;
 575             fr.readable = mr->readable;
 576             fr.readonly = readonly;
 577             flatview_insert(view, i, &fr);
 578             ++i;
 579             int128_addto(&base, now);
 580             offset_in_region += int128_get64(now);
 581             int128_subfrom(&remain, now);
 582         }
 583         if (int128_eq(base, view->ranges[i].addr.start)) {
 584             now = int128_min(remain, view->ranges[i].addr.size);
 585             int128_addto(&base, now);
 586             offset_in_region += int128_get64(now);
 587             int128_subfrom(&remain, now);
 588         }
 589     }
 590     if (int128_nz(remain)) {
 591         fr.mr = mr;
 592         fr.offset_in_region = offset_in_region;
 593         fr.addr = addrrange_make(base, remain);
 594         fr.dirty_log_mask = mr->dirty_log_mask;
 595         fr.readable = mr->readable;
 596         fr.readonly = readonly;
 597         flatview_insert(view, i, &fr);
 598     }
 599 }
 600
 601 /* Render a memory topology into a list of disjoint absolute ranges. */
 602 static FlatView generate_memory_topology(MemoryRegion *mr)
 603 {
 604     FlatView view;
 605
 606     flatview_init(&view);
 607
 608     render_memory_region(&view, mr, int128_zero(),
 609                          addrrange_make(int128_zero(), int128_2_64()), false);
 610     flatview_simplify(&view);
 611
 612     return view;
 613 }
 614
 615 static void address_space_add_del_ioeventfds(AddressSpace *as,
 616                                              MemoryRegionIoeventfd *fds_new,
 617                                              unsigned fds_new_nb,
 618                                              MemoryRegionIoeventfd *fds_old,
 619                                              unsigned fds_old_nb)
 620 {
 621     unsigned iold, inew;
 622
 623     /* Generate a symmetric difference of the old and new fd sets, adding
 624      * and deleting as necessary.
 625      */
 626
 627     iold = inew = 0;
 628     while (iold < fds_old_nb || inew < fds_new_nb) {
 629         if (iold < fds_old_nb
 630             && (inew == fds_new_nb
 631                 || memory_region_ioeventfd_before(fds_old[iold],
 632                                                   fds_new[inew]))) {
 633             as->ops->ioeventfd_del(as, &fds_old[iold]);
 634             ++iold;
 635         } else if (inew < fds_new_nb
 636                    && (iold == fds_old_nb
 637                        || memory_region_ioeventfd_before(fds_new[inew],
 638                                                          fds_old[iold]))) {
 639             as->ops->ioeventfd_add(as, &fds_new[inew]);
 640             ++inew;
 641         } else {
 642             ++iold;
 643             ++inew;
 644         }
 645     }
 646 }
 647
 648 static void address_space_update_ioeventfds(AddressSpace *as)
 649 {
 650     FlatRange *fr;
 651     unsigned ioeventfd_nb = 0;
 652     MemoryRegionIoeventfd *ioeventfds = NULL;
 653     AddrRange tmp;
 654     unsigned i;
 655
 656     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
 657         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 658             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 659                                   int128_sub(fr->addr.start,
 660                                              int128_make64(fr->offset_in_region)));
 661             if (addrrange_intersects(fr->addr, tmp)) {
 662                 ++ioeventfd_nb;
 663                 ioeventfds = g_realloc(ioeventfds,
 664                                           ioeventfd_nb * sizeof(*ioeventfds));
 665                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 666                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 667             }
 668         }
 669     }
 670
 671     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 672                                      as->ioeventfds, as->ioeventfd_nb);
 673
 674     g_free(as->ioeventfds);
 675     as->ioeventfds = ioeventfds;
 676     as->ioeventfd_nb = ioeventfd_nb;
 677 }
 678
 679 typedef void ListenerCallback(MemoryListener *listener,
 680                               MemoryRegionSection *mrs);
 681
 682 /* Want "void (&MemoryListener::*callback)(const MemoryRegionSection& s)" */
 683 static void memory_listener_update_region(FlatRange *fr, AddressSpace *as,
 684                                           size_t callback_offset)
 685 {
 686     MemoryRegionSection section = {
 687         .mr = fr->mr,
 688         .address_space = as->root,
 689         .offset_within_region = fr->offset_in_region,
 690         .size = int128_get64(fr->addr.size),
 691         .offset_within_address_space = int128_get64(fr->addr.start),
 692     };
 693     MemoryListener *listener;
 694
 695     QLIST_FOREACH(listener, &memory_listeners, link) {
 696         ListenerCallback *callback
 697             = *(ListenerCallback **)((void *)listener + callback_offset);
 698         callback(listener, &section);
 699     }
 700 }
 701
 702 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, callback) \
 703     memory_listener_update_region(fr, as, offsetof(MemoryListener, callback))
 704
 705 static void address_space_update_topology_pass(AddressSpace *as,
 706                                                FlatView old_view,
 707                                                FlatView new_view,
 708                                                bool adding)
 709 {
 710     unsigned iold, inew;
 711     FlatRange *frold, *frnew;
 712
 713     /* Generate a symmetric difference of the old and new memory maps.
 714      * Kill ranges in the old map, and instantiate ranges in the new map.
 715      */
 716     iold = inew = 0;
 717     while (iold < old_view.nr || inew < new_view.nr) {
 718         if (iold < old_view.nr) {
 719             frold = &old_view.ranges[iold];
 720         } else {
 721             frold = NULL;
 722         }
 723         if (inew < new_view.nr) {
 724             frnew = &new_view.ranges[inew];
 725         } else {
 726             frnew = NULL;
 727         }
 728
 729         if (frold
 730             && (!frnew
 731                 || int128_lt(frold->addr.start, frnew->addr.start)
 732                 || (int128_eq(frold->addr.start, frnew->addr.start)
 733                     && !flatrange_equal(frold, frnew)))) {
 734             /* In old, but (not in new, or in new but attributes changed). */
 735
 736             if (!adding) {
 737                 MEMORY_LISTENER_UPDATE_REGION(frold, as, region_del);
 738                 as->ops->range_del(as, frold);
 739             }
 740
 741             ++iold;
 742         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 743             /* In both (logging may have changed) */
 744
 745             if (adding) {
 746                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 747                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_stop);
 748                     as->ops->log_stop(as, frnew);
 749                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 750                     as->ops->log_start(as, frnew);
 751                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_start);
 752                 }
 753             }
 754
 755             ++iold;
 756             ++inew;
 757         } else {
 758             /* In new */
 759
 760             if (adding) {
 761                 as->ops->range_add(as, frnew);
 762                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, region_add);
 763             }
 764
 765             ++inew;
 766         }
 767     }
 768 }
 769
 770
 771 static void address_space_update_topology(AddressSpace *as)
 772 {
 773     FlatView old_view = as->current_map;
 774     FlatView new_view = generate_memory_topology(as->root);
 775
 776     address_space_update_topology_pass(as, old_view, new_view, false);
 777     address_space_update_topology_pass(as, old_view, new_view, true);
 778
 779     as->current_map = new_view;
 780     flatview_destroy(&old_view);
 781     address_space_update_ioeventfds(as);
 782 }
 783
 784 static void memory_region_update_topology(MemoryRegion *mr)
 785 {
 786     if (memory_region_transaction_depth) {
 787         memory_region_update_pending |= !mr || mr->enabled;
 788         return;
 789     }
 790
 791     if (mr && !mr->enabled) {
 792         return;
 793     }
 794
 795     if (address_space_memory.root) {
 796         address_space_update_topology(&address_space_memory);
 797     }
 798     if (address_space_io.root) {
 799         address_space_update_topology(&address_space_io);
 800     }
 801
 802     memory_region_update_pending = false;
 803 }
 804
 805 void memory_region_transaction_begin(void)
 806 {
 807     ++memory_region_transaction_depth;
 808 }
 809
 810 void memory_region_transaction_commit(void)
 811 {
 812     assert(memory_region_transaction_depth);
 813     --memory_region_transaction_depth;
 814     if (!memory_region_transaction_depth && memory_region_update_pending) {
 815         memory_region_update_topology(NULL);
 816     }
 817 }
 818
 819 static void memory_region_destructor_none(MemoryRegion *mr)
 820 {
 821 }
 822
 823 static void memory_region_destructor_ram(MemoryRegion *mr)
 824 {
 825     qemu_ram_free(mr->ram_addr);
 826 }
 827
 828 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 829 {
 830     qemu_ram_free_from_ptr(mr->ram_addr);
 831 }
 832
 833 static void memory_region_destructor_iomem(MemoryRegion *mr)
 834 {
 835     cpu_unregister_io_memory(mr->ram_addr);
 836 }
 837
 838 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 839 {
 840     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 841     cpu_unregister_io_memory(mr->ram_addr & ~(TARGET_PAGE_MASK | IO_MEM_ROMD));
 842 }
 843
 844 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 845 {
 846 #ifdef TARGET_BIG_ENDIAN
 847     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 848 #else
 849     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 850 #endif
 851 }
 852
 853 void memory_region_init(MemoryRegion *mr,
 854                         const char *name,
 855                         uint64_t size)
 856 {
 857     mr->ops = NULL;
 858     mr->parent = NULL;
 859     mr->size = int128_make64(size);
 860     if (size == UINT64_MAX) {
 861         mr->size = int128_2_64();
 862     }
 863     mr->addr = 0;
 864     mr->offset = 0;
 865     mr->enabled = true;
 866     mr->terminates = false;
 867     mr->ram = false;
 868     mr->readable = true;
 869     mr->readonly = false;
 870     mr->destructor = memory_region_destructor_none;
 871     mr->priority = 0;
 872     mr->may_overlap = false;
 873     mr->alias = NULL;
 874     QTAILQ_INIT(&mr->subregions);
 875     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 876     QTAILQ_INIT(&mr->coalesced);
 877     mr->name = g_strdup(name);
 878     mr->dirty_log_mask = 0;
 879     mr->ioeventfd_nb = 0;
 880     mr->ioeventfds = NULL;
 881 }
 882
 883 static bool memory_region_access_valid(MemoryRegion *mr,
 884                                        target_phys_addr_t addr,
 885                                        unsigned size,
 886                                        bool is_write)
 887 {
 888     if (mr->ops->valid.accepts
 889         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 890         return false;
 891     }
 892
 893     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 894         return false;
 895     }
 896
 897     /* Treat zero as compatibility all valid */
 898     if (!mr->ops->valid.max_access_size) {
 899         return true;
 900     }
 901
 902     if (size > mr->ops->valid.max_access_size
 903         || size < mr->ops->valid.min_access_size) {
 904         return false;
 905     }
 906     return true;
 907 }
 908
 909 static uint32_t memory_region_read_thunk_n(void *_mr,
 910                                            target_phys_addr_t addr,
 911                                            unsigned size)
 912 {
 913     MemoryRegion *mr = _mr;
 914     uint64_t data = 0;
 915
 916     if (!memory_region_access_valid(mr, addr, size, false)) {
 917         return -1U; /* FIXME: better signalling */
 918     }
 919
 920     if (!mr->ops->read) {
 921         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 922     }
 923
 924     /* FIXME: support unaligned access */
 925     access_with_adjusted_size(addr + mr->offset, &data, size,
 926                               mr->ops->impl.min_access_size,
 927                               mr->ops->impl.max_access_size,
 928                               memory_region_read_accessor, mr);
 929
 930     return data;
 931 }
 932
 933 static void memory_region_write_thunk_n(void *_mr,
 934                                         target_phys_addr_t addr,
 935                                         unsigned size,
 936                                         uint64_t data)
 937 {
 938     MemoryRegion *mr = _mr;
 939
 940     if (!memory_region_access_valid(mr, addr, size, true)) {
 941         return; /* FIXME: better signalling */
 942     }
 943
 944     if (!mr->ops->write) {
 945         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 946         return;
 947     }
 948
 949     /* FIXME: support unaligned access */
 950     access_with_adjusted_size(addr + mr->offset, &data, size,
 951                               mr->ops->impl.min_access_size,
 952                               mr->ops->impl.max_access_size,
 953                               memory_region_write_accessor, mr);
 954 }
 955
 956 static uint32_t memory_region_read_thunk_b(void *mr, target_phys_addr_t addr)
 957 {
 958     return memory_region_read_thunk_n(mr, addr, 1);
 959 }
 960
 961 static uint32_t memory_region_read_thunk_w(void *mr, target_phys_addr_t addr)
 962 {
 963     uint32_t data;
 964
 965     data = memory_region_read_thunk_n(mr, addr, 2);
 966     if (memory_region_wrong_endianness(mr)) {
 967         data = bswap16(data);
 968     }
 969     return data;
 970 }
 971
 972 static uint32_t memory_region_read_thunk_l(void *mr, target_phys_addr_t addr)
 973 {
 974     uint32_t data;
 975
 976     data = memory_region_read_thunk_n(mr, addr, 4);
 977     if (memory_region_wrong_endianness(mr)) {
 978         data = bswap32(data);
 979     }
 980     return data;
 981 }
 982
 983 static void memory_region_write_thunk_b(void *mr, target_phys_addr_t addr,
 984                                         uint32_t data)
 985 {
 986     memory_region_write_thunk_n(mr, addr, 1, data);
 987 }
 988
 989 static void memory_region_write_thunk_w(void *mr, target_phys_addr_t addr,
 990                                         uint32_t data)
 991 {
 992     if (memory_region_wrong_endianness(mr)) {
 993         data = bswap16(data);
 994     }
 995     memory_region_write_thunk_n(mr, addr, 2, data);
 996 }
 997
 998 static void memory_region_write_thunk_l(void *mr, target_phys_addr_t addr,
 999                                         uint32_t data)
1000 {
1001     if (memory_region_wrong_endianness(mr)) {
1002         data = bswap32(data);
1003     }
1004     memory_region_write_thunk_n(mr, addr, 4, data);
1005 }
1006
1007 static CPUReadMemoryFunc * const memory_region_read_thunk[] = {
1008     memory_region_read_thunk_b,
1009     memory_region_read_thunk_w,
1010     memory_region_read_thunk_l,
1011 };
1012
1013 static CPUWriteMemoryFunc * const memory_region_write_thunk[] = {
1014     memory_region_write_thunk_b,
1015     memory_region_write_thunk_w,
1016     memory_region_write_thunk_l,
1017 };
1018
1019 void memory_region_init_io(MemoryRegion *mr,
1020                            const MemoryRegionOps *ops,
1021                            void *opaque,
1022                            const char *name,
1023                            uint64_t size)
1024 {
1025     memory_region_init(mr, name, size);
1026     mr->ops = ops;
1027     mr->opaque = opaque;
1028     mr->terminates = true;
1029     mr->destructor = memory_region_destructor_iomem;
1030     mr->ram_addr = cpu_register_io_memory(memory_region_read_thunk,
1031                                           memory_region_write_thunk,
1032                                           mr);
1033 }
1034
1035 void memory_region_init_ram(MemoryRegion *mr,
1036                             const char *name,
1037                             uint64_t size)
1038 {
1039     memory_region_init(mr, name, size);
1040     mr->ram = true;
1041     mr->terminates = true;
1042     mr->destructor = memory_region_destructor_ram;
1043     mr->ram_addr = qemu_ram_alloc(size, mr);
1044 }
1045
1046 void memory_region_init_ram_ptr(MemoryRegion *mr,
1047                                 const char *name,
1048                                 uint64_t size,
1049                                 void *ptr)
1050 {
1051     memory_region_init(mr, name, size);
1052     mr->ram = true;
1053     mr->terminates = true;
1054     mr->destructor = memory_region_destructor_ram_from_ptr;
1055     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
1056 }
1057
1058 void memory_region_init_alias(MemoryRegion *mr,
1059                               const char *name,
1060                               MemoryRegion *orig,
1061                               target_phys_addr_t offset,
1062                               uint64_t size)
1063 {
1064     memory_region_init(mr, name, size);
1065     mr->alias = orig;
1066     mr->alias_offset = offset;
1067 }
1068
1069 void memory_region_init_rom_device(MemoryRegion *mr,
1070                                    const MemoryRegionOps *ops,
1071                                    void *opaque,
1072                                    const char *name,
1073                                    uint64_t size)
1074 {
1075     memory_region_init(mr, name, size);
1076     mr->ops = ops;
1077     mr->opaque = opaque;
1078     mr->terminates = true;
1079     mr->destructor = memory_region_destructor_rom_device;
1080     mr->ram_addr = qemu_ram_alloc(size, mr);
1081     mr->ram_addr |= cpu_register_io_memory(memory_region_read_thunk,
1082                                            memory_region_write_thunk,
1083                                            mr);
1084     mr->ram_addr |= IO_MEM_ROMD;
1085 }
1086
1087 void memory_region_destroy(MemoryRegion *mr)
1088 {
1089     assert(QTAILQ_EMPTY(&mr->subregions));
1090     mr->destructor(mr);
1091     memory_region_clear_coalescing(mr);
1092     g_free((char *)mr->name);
1093     g_free(mr->ioeventfds);
1094 }
1095
1096 uint64_t memory_region_size(MemoryRegion *mr)
1097 {
1098     if (int128_eq(mr->size, int128_2_64())) {
1099         return UINT64_MAX;
1100     }
1101     return int128_get64(mr->size);
1102 }
1103
1104 const char *memory_region_name(MemoryRegion *mr)
1105 {
1106     return mr->name;
1107 }
1108
1109 bool memory_region_is_ram(MemoryRegion *mr)
1110 {
1111     return mr->ram;
1112 }
1113
1114 bool memory_region_is_logging(MemoryRegion *mr)
1115 {
1116     return mr->dirty_log_mask;
1117 }
1118
1119 bool memory_region_is_rom(MemoryRegion *mr)
1120 {
1121     return mr->ram && mr->readonly;
1122 }
1123
1124 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
1125 {
1126     mr->offset = offset;
1127 }
1128
1129 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1130 {
1131     uint8_t mask = 1 << client;
1132
1133     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1134     memory_region_update_topology(mr);
1135 }
1136
1137 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1138                              unsigned client)
1139 {
1140     assert(mr->terminates);
1141     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, 1 << client);
1142 }
1143
1144 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr)
1145 {
1146     assert(mr->terminates);
1147     return cpu_physical_memory_set_dirty(mr->ram_addr + addr);
1148 }
1149
1150 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1151 {
1152     FlatRange *fr;
1153
1154     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1155         if (fr->mr == mr) {
1156             MEMORY_LISTENER_UPDATE_REGION(fr, &address_space_memory, log_sync);
1157         }
1158     }
1159 }
1160
1161 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1162 {
1163     if (mr->readonly != readonly) {
1164         mr->readonly = readonly;
1165         memory_region_update_topology(mr);
1166     }
1167 }
1168
1169 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1170 {
1171     if (mr->readable != readable) {
1172         mr->readable = readable;
1173         memory_region_update_topology(mr);
1174     }
1175 }
1176
1177 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1178                                target_phys_addr_t size, unsigned client)
1179 {
1180     assert(mr->terminates);
1181     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1182                                     mr->ram_addr + addr + size,
1183                                     1 << client);
1184 }
1185
1186 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1187 {
1188     if (mr->alias) {
1189         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1190     }
1191
1192     assert(mr->terminates);
1193
1194     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1195 }
1196
1197 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1198 {
1199     FlatRange *fr;
1200     CoalescedMemoryRange *cmr;
1201     AddrRange tmp;
1202
1203     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1204         if (fr->mr == mr) {
1205             qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
1206                                            int128_get64(fr->addr.size));
1207             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1208                 tmp = addrrange_shift(cmr->addr,
1209                                       int128_sub(fr->addr.start,
1210                                                  int128_make64(fr->offset_in_region)));
1211                 if (!addrrange_intersects(tmp, fr->addr)) {
1212                     continue;
1213                 }
1214                 tmp = addrrange_intersection(tmp, fr->addr);
1215                 qemu_register_coalesced_mmio(int128_get64(tmp.start),
1216                                              int128_get64(tmp.size));
1217             }
1218         }
1219     }
1220 }
1221
1222 void memory_region_set_coalescing(MemoryRegion *mr)
1223 {
1224     memory_region_clear_coalescing(mr);
1225     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1226 }
1227
1228 void memory_region_add_coalescing(MemoryRegion *mr,
1229                                   target_phys_addr_t offset,
1230                                   uint64_t size)
1231 {
1232     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1233
1234     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1235     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1236     memory_region_update_coalesced_range(mr);
1237 }
1238
1239 void memory_region_clear_coalescing(MemoryRegion *mr)
1240 {
1241     CoalescedMemoryRange *cmr;
1242
1243     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1244         cmr = QTAILQ_FIRST(&mr->coalesced);
1245         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1246         g_free(cmr);
1247     }
1248     memory_region_update_coalesced_range(mr);
1249 }
1250
1251 void memory_region_add_eventfd(MemoryRegion *mr,
1252                                target_phys_addr_t addr,
1253                                unsigned size,
1254                                bool match_data,
1255                                uint64_t data,
1256                                int fd)
1257 {
1258     MemoryRegionIoeventfd mrfd = {
1259         .addr.start = int128_make64(addr),
1260         .addr.size = int128_make64(size),
1261         .match_data = match_data,
1262         .data = data,
1263         .fd = fd,
1264     };
1265     unsigned i;
1266
1267     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1268         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1269             break;
1270         }
1271     }
1272     ++mr->ioeventfd_nb;
1273     mr->ioeventfds = g_realloc(mr->ioeventfds,
1274                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1275     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1276             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1277     mr->ioeventfds[i] = mrfd;
1278     memory_region_update_topology(mr);
1279 }
1280
1281 void memory_region_del_eventfd(MemoryRegion *mr,
1282                                target_phys_addr_t addr,
1283                                unsigned size,
1284                                bool match_data,
1285                                uint64_t data,
1286                                int fd)
1287 {
1288     MemoryRegionIoeventfd mrfd = {
1289         .addr.start = int128_make64(addr),
1290         .addr.size = int128_make64(size),
1291         .match_data = match_data,
1292         .data = data,
1293         .fd = fd,
1294     };
1295     unsigned i;
1296
1297     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1298         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1299             break;
1300         }
1301     }
1302     assert(i != mr->ioeventfd_nb);
1303     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1304             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1305     --mr->ioeventfd_nb;
1306     mr->ioeventfds = g_realloc(mr->ioeventfds,
1307                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1308     memory_region_update_topology(mr);
1309 }
1310
1311 static void memory_region_add_subregion_common(MemoryRegion *mr,
1312                                                target_phys_addr_t offset,
1313                                                MemoryRegion *subregion)
1314 {
1315     MemoryRegion *other;
1316
1317     assert(!subregion->parent);
1318     subregion->parent = mr;
1319     subregion->addr = offset;
1320     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1321         if (subregion->may_overlap || other->may_overlap) {
1322             continue;
1323         }
1324         if (int128_gt(int128_make64(offset),
1325                       int128_add(int128_make64(other->addr), other->size))
1326             || int128_le(int128_add(int128_make64(offset), subregion->size),
1327                          int128_make64(other->addr))) {
1328             continue;
1329         }
1330 #if 0
1331         printf("warning: subregion collision %llx/%llx (%s) "
1332                "vs %llx/%llx (%s)\n",
1333                (unsigned long long)offset,
1334                (unsigned long long)int128_get64(subregion->size),
1335                subregion->name,
1336                (unsigned long long)other->addr,
1337                (unsigned long long)int128_get64(other->size),
1338                other->name);
1339 #endif
1340     }
1341     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1342         if (subregion->priority >= other->priority) {
1343             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1344             goto done;
1345         }
1346     }
1347     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1348 done:
1349     memory_region_update_topology(mr);
1350 }
1351
1352
1353 void memory_region_add_subregion(MemoryRegion *mr,
1354                                  target_phys_addr_t offset,
1355                                  MemoryRegion *subregion)
1356 {
1357     subregion->may_overlap = false;
1358     subregion->priority = 0;
1359     memory_region_add_subregion_common(mr, offset, subregion);
1360 }
1361
1362 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1363                                          target_phys_addr_t offset,
1364                                          MemoryRegion *subregion,
1365                                          unsigned priority)
1366 {
1367     subregion->may_overlap = true;
1368     subregion->priority = priority;
1369     memory_region_add_subregion_common(mr, offset, subregion);
1370 }
1371
1372 void memory_region_del_subregion(MemoryRegion *mr,
1373                                  MemoryRegion *subregion)
1374 {
1375     assert(subregion->parent == mr);
1376     subregion->parent = NULL;
1377     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1378     memory_region_update_topology(mr);
1379 }
1380
1381 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1382 {
1383     if (enabled == mr->enabled) {
1384         return;
1385     }
1386     mr->enabled = enabled;
1387     memory_region_update_topology(NULL);
1388 }
1389
1390 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
1391 {
1392     MemoryRegion *parent = mr->parent;
1393     unsigned priority = mr->priority;
1394     bool may_overlap = mr->may_overlap;
1395
1396     if (addr == mr->addr || !parent) {
1397         mr->addr = addr;
1398         return;
1399     }
1400
1401     memory_region_transaction_begin();
1402     memory_region_del_subregion(parent, mr);
1403     if (may_overlap) {
1404         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1405     } else {
1406         memory_region_add_subregion(parent, addr, mr);
1407     }
1408     memory_region_transaction_commit();
1409 }
1410
1411 void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
1412 {
1413     target_phys_addr_t old_offset = mr->alias_offset;
1414
1415     assert(mr->alias);
1416     mr->alias_offset = offset;
1417
1418     if (offset == old_offset || !mr->parent) {
1419         return;
1420     }
1421
1422     memory_region_update_topology(mr);
1423 }
1424
1425 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1426 {
1427     return mr->ram_addr;
1428 }
1429
1430 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1431 {
1432     const AddrRange *addr = addr_;
1433     const FlatRange *fr = fr_;
1434
1435     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1436         return -1;
1437     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1438         return 1;
1439     }
1440     return 0;
1441 }
1442
1443 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1444 {
1445     return bsearch(&addr, as->current_map.ranges, as->current_map.nr,
1446                    sizeof(FlatRange), cmp_flatrange_addr);
1447 }
1448
1449 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1450                                        target_phys_addr_t addr, uint64_t size)
1451 {
1452     AddressSpace *as = memory_region_to_address_space(address_space);
1453     AddrRange range = addrrange_make(int128_make64(addr),
1454                                      int128_make64(size));
1455     FlatRange *fr = address_space_lookup(as, range);
1456     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1457
1458     if (!fr) {
1459         return ret;
1460     }
1461
1462     while (fr > as->current_map.ranges
1463            && addrrange_intersects(fr[-1].addr, range)) {
1464         --fr;
1465     }
1466
1467     ret.mr = fr->mr;
1468     range = addrrange_intersection(range, fr->addr);
1469     ret.offset_within_region = fr->offset_in_region;
1470     ret.offset_within_region += int128_get64(int128_sub(range.start,
1471                                                         fr->addr.start));
1472     ret.size = int128_get64(range.size);
1473     ret.offset_within_address_space = int128_get64(range.start);
1474     return ret;
1475 }
1476
1477 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1478 {
1479     AddressSpace *as = memory_region_to_address_space(address_space);
1480     FlatRange *fr;
1481
1482     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1483         MEMORY_LISTENER_UPDATE_REGION(fr, as, log_sync);
1484     }
1485 }
1486
1487 void memory_global_dirty_log_start(void)
1488 {
1489     MemoryListener *listener;
1490
1491     cpu_physical_memory_set_dirty_tracking(1);
1492     global_dirty_log = true;
1493     QLIST_FOREACH(listener, &memory_listeners, link) {
1494         listener->log_global_start(listener);
1495     }
1496 }
1497
1498 void memory_global_dirty_log_stop(void)
1499 {
1500     MemoryListener *listener;
1501
1502     global_dirty_log = false;
1503     QLIST_FOREACH(listener, &memory_listeners, link) {
1504         listener->log_global_stop(listener);
1505     }
1506     cpu_physical_memory_set_dirty_tracking(0);
1507 }
1508
1509 static void listener_add_address_space(MemoryListener *listener,
1510                                        AddressSpace *as)
1511 {
1512     FlatRange *fr;
1513
1514     if (global_dirty_log) {
1515         listener->log_global_start(listener);
1516     }
1517     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1518         MemoryRegionSection section = {
1519             .mr = fr->mr,
1520             .address_space = as->root,
1521             .offset_within_region = fr->offset_in_region,
1522             .size = int128_get64(fr->addr.size),
1523             .offset_within_address_space = int128_get64(fr->addr.start),
1524         };
1525         listener->region_add(listener, &section);
1526     }
1527 }
1528
1529 void memory_listener_register(MemoryListener *listener)
1530 {
1531     QLIST_INSERT_HEAD(&memory_listeners, listener, link);
1532     listener_add_address_space(listener, &address_space_memory);
1533     listener_add_address_space(listener, &address_space_io);
1534 }
1535
1536 void memory_listener_unregister(MemoryListener *listener)
1537 {
1538     QLIST_REMOVE(listener, link);
1539 }
1540
1541 void set_system_memory_map(MemoryRegion *mr)
1542 {
1543     address_space_memory.root = mr;
1544     memory_region_update_topology(NULL);
1545 }
1546
1547 void set_system_io_map(MemoryRegion *mr)
1548 {
1549     address_space_io.root = mr;
1550     memory_region_update_topology(NULL);
1551 }
1552
1553 uint64_t io_mem_read(int io_index, target_phys_addr_t addr, unsigned size)
1554 {
1555     return _io_mem_read[io_index][bitops_ffsl(size)](io_mem_opaque[io_index],
1556                                                      addr);
1557 }
1558
1559 void io_mem_write(int io_index, target_phys_addr_t addr,
1560                   uint64_t val, unsigned size)
1561 {
1562     _io_mem_write[io_index][bitops_ffsl(size)](io_mem_opaque[io_index],
1563                                                addr, val);
1564 }
1565
1566 typedef struct MemoryRegionList MemoryRegionList;
1567
1568 struct MemoryRegionList {
1569     const MemoryRegion *mr;
1570     bool printed;
1571     QTAILQ_ENTRY(MemoryRegionList) queue;
1572 };
1573
1574 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1575
1576 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1577                            const MemoryRegion *mr, unsigned int level,
1578                            target_phys_addr_t base,
1579                            MemoryRegionListHead *alias_print_queue)
1580 {
1581     MemoryRegionList *new_ml, *ml, *next_ml;
1582     MemoryRegionListHead submr_print_queue;
1583     const MemoryRegion *submr;
1584     unsigned int i;
1585
1586     if (!mr) {
1587         return;
1588     }
1589
1590     for (i = 0; i < level; i++) {
1591         mon_printf(f, "  ");
1592     }
1593
1594     if (mr->alias) {
1595         MemoryRegionList *ml;
1596         bool found = false;
1597
1598         /* check if the alias is already in the queue */
1599         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1600             if (ml->mr == mr->alias && !ml->printed) {
1601                 found = true;
1602             }
1603         }
1604
1605         if (!found) {
1606             ml = g_new(MemoryRegionList, 1);
1607             ml->mr = mr->alias;
1608             ml->printed = false;
1609             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1610         }
1611         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): alias %s @%s "
1612                    TARGET_FMT_plx "-" TARGET_FMT_plx "\n",
1613                    base + mr->addr,
1614                    base + mr->addr
1615                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1616                    mr->priority,
1617                    mr->name,
1618                    mr->alias->name,
1619                    mr->alias_offset,
1620                    mr->alias_offset
1621                    + (target_phys_addr_t)int128_get64(mr->size) - 1);
1622     } else {
1623         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): %s\n",
1624                    base + mr->addr,
1625                    base + mr->addr
1626                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1627                    mr->priority,
1628                    mr->name);
1629     }
1630
1631     QTAILQ_INIT(&submr_print_queue);
1632
1633     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1634         new_ml = g_new(MemoryRegionList, 1);
1635         new_ml->mr = submr;
1636         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1637             if (new_ml->mr->addr < ml->mr->addr ||
1638                 (new_ml->mr->addr == ml->mr->addr &&
1639                  new_ml->mr->priority > ml->mr->priority)) {
1640                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1641                 new_ml = NULL;
1642                 break;
1643             }
1644         }
1645         if (new_ml) {
1646             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1647         }
1648     }
1649
1650     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1651         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1652                        alias_print_queue);
1653     }
1654
1655     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1656         g_free(ml);
1657     }
1658 }
1659
1660 void mtree_info(fprintf_function mon_printf, void *f)
1661 {
1662     MemoryRegionListHead ml_head;
1663     MemoryRegionList *ml, *ml2;
1664
1665     QTAILQ_INIT(&ml_head);
1666
1667     mon_printf(f, "memory\n");
1668     mtree_print_mr(mon_printf, f, address_space_memory.root, 0, 0, &ml_head);
1669
1670     /* print aliased regions */
1671     QTAILQ_FOREACH(ml, &ml_head, queue) {
1672         if (!ml->printed) {
1673             mon_printf(f, "%s\n", ml->mr->name);
1674             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1675         }
1676     }
1677
1678     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1679         g_free(ml);
1680     }
1681
1682     if (address_space_io.root &&
1683         !QTAILQ_EMPTY(&address_space_io.root->subregions)) {
1684         QTAILQ_INIT(&ml_head);
1685         mon_printf(f, "I/O\n");
1686         mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
1687     }
1688 }