memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <avi@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "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 memory_region_update_pending = false;
  28 static bool global_dirty_log = false;
  29
  30 static QLIST_HEAD(, MemoryListener) memory_listeners
  31     = QLIST_HEAD_INITIALIZER(memory_listeners);
  32
  33 typedef struct AddrRange AddrRange;
  34
  35 /*
  36  * Note using signed integers limits us to physical addresses at most
  37  * 63 bits wide.  They are needed for negative offsetting in aliases
  38  * (large MemoryRegion::alias_offset).
  39  */
  40 struct AddrRange {
  41     Int128 start;
  42     Int128 size;
  43 };
  44
  45 static AddrRange addrrange_make(Int128 start, Int128 size)
  46 {
  47     return (AddrRange) { start, size };
  48 }
  49
  50 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  51 {
  52     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  53 }
  54
  55 static Int128 addrrange_end(AddrRange r)
  56 {
  57     return int128_add(r.start, r.size);
  58 }
  59
  60 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  61 {
  62     int128_addto(&range.start, delta);
  63     return range;
  64 }
  65
  66 static bool addrrange_contains(AddrRange range, Int128 addr)
  67 {
  68     return int128_ge(addr, range.start)
  69         && int128_lt(addr, addrrange_end(range));
  70 }
  71
  72 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  73 {
  74     return addrrange_contains(r1, r2.start)
  75         || addrrange_contains(r2, r1.start);
  76 }
  77
  78 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  79 {
  80     Int128 start = int128_max(r1.start, r2.start);
  81     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  82     return addrrange_make(start, int128_sub(end, start));
  83 }
  84
  85 struct CoalescedMemoryRange {
  86     AddrRange addr;
  87     QTAILQ_ENTRY(CoalescedMemoryRange) link;
  88 };
  89
  90 struct MemoryRegionIoeventfd {
  91     AddrRange addr;
  92     bool match_data;
  93     uint64_t data;
  94     int fd;
  95 };
  96
  97 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
  98                                            MemoryRegionIoeventfd b)
  99 {
 100     if (int128_lt(a.addr.start, b.addr.start)) {
 101         return true;
 102     } else if (int128_gt(a.addr.start, b.addr.start)) {
 103         return false;
 104     } else if (int128_lt(a.addr.size, b.addr.size)) {
 105         return true;
 106     } else if (int128_gt(a.addr.size, b.addr.size)) {
 107         return false;
 108     } else if (a.match_data < b.match_data) {
 109         return true;
 110     } else  if (a.match_data > b.match_data) {
 111         return false;
 112     } else if (a.match_data) {
 113         if (a.data < b.data) {
 114             return true;
 115         } else if (a.data > b.data) {
 116             return false;
 117         }
 118     }
 119     if (a.fd < b.fd) {
 120         return true;
 121     } else if (a.fd > b.fd) {
 122         return false;
 123     }
 124     return false;
 125 }
 126
 127 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 128                                           MemoryRegionIoeventfd b)
 129 {
 130     return !memory_region_ioeventfd_before(a, b)
 131         && !memory_region_ioeventfd_before(b, a);
 132 }
 133
 134 typedef struct FlatRange FlatRange;
 135 typedef struct FlatView FlatView;
 136
 137 /* Range of memory in the global map.  Addresses are absolute. */
 138 struct FlatRange {
 139     MemoryRegion *mr;
 140     target_phys_addr_t offset_in_region;
 141     AddrRange addr;
 142     uint8_t dirty_log_mask;
 143     bool readable;
 144     bool readonly;
 145 };
 146
 147 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 148  * order.
 149  */
 150 struct FlatView {
 151     FlatRange *ranges;
 152     unsigned nr;
 153     unsigned nr_allocated;
 154 };
 155
 156 typedef struct AddressSpace AddressSpace;
 157 typedef struct AddressSpaceOps AddressSpaceOps;
 158
 159 /* A system address space - I/O, memory, etc. */
 160 struct AddressSpace {
 161     const AddressSpaceOps *ops;
 162     MemoryRegion *root;
 163     FlatView current_map;
 164     int ioeventfd_nb;
 165     MemoryRegionIoeventfd *ioeventfds;
 166 };
 167
 168 struct AddressSpaceOps {
 169     void (*range_add)(AddressSpace *as, FlatRange *fr);
 170     void (*range_del)(AddressSpace *as, FlatRange *fr);
 171     void (*log_start)(AddressSpace *as, FlatRange *fr);
 172     void (*log_stop)(AddressSpace *as, FlatRange *fr);
 173     void (*ioeventfd_add)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 174     void (*ioeventfd_del)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 175 };
 176
 177 #define FOR_EACH_FLAT_RANGE(var, view)          \
 178     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 179
 180 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 181 {
 182     return a->mr == b->mr
 183         && addrrange_equal(a->addr, b->addr)
 184         && a->offset_in_region == b->offset_in_region
 185         && a->readable == b->readable
 186         && a->readonly == b->readonly;
 187 }
 188
 189 static void flatview_init(FlatView *view)
 190 {
 191     view->ranges = NULL;
 192     view->nr = 0;
 193     view->nr_allocated = 0;
 194 }
 195
 196 /* Insert a range into a given position.  Caller is responsible for maintaining
 197  * sorting order.
 198  */
 199 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 200 {
 201     if (view->nr == view->nr_allocated) {
 202         view->nr_allocated = MAX(2 * view->nr, 10);
 203         view->ranges = g_realloc(view->ranges,
 204                                     view->nr_allocated * sizeof(*view->ranges));
 205     }
 206     memmove(view->ranges + pos + 1, view->ranges + pos,
 207             (view->nr - pos) * sizeof(FlatRange));
 208     view->ranges[pos] = *range;
 209     ++view->nr;
 210 }
 211
 212 static void flatview_destroy(FlatView *view)
 213 {
 214     g_free(view->ranges);
 215 }
 216
 217 static bool can_merge(FlatRange *r1, FlatRange *r2)
 218 {
 219     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 220         && r1->mr == r2->mr
 221         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 222                                 r1->addr.size),
 223                      int128_make64(r2->offset_in_region))
 224         && r1->dirty_log_mask == r2->dirty_log_mask
 225         && r1->readable == r2->readable
 226         && r1->readonly == r2->readonly;
 227 }
 228
 229 /* Attempt to simplify a view by merging ajacent ranges */
 230 static void flatview_simplify(FlatView *view)
 231 {
 232     unsigned i, j;
 233
 234     i = 0;
 235     while (i < view->nr) {
 236         j = i + 1;
 237         while (j < view->nr
 238                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 239             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 240             ++j;
 241         }
 242         ++i;
 243         memmove(&view->ranges[i], &view->ranges[j],
 244                 (view->nr - j) * sizeof(view->ranges[j]));
 245         view->nr -= j - i;
 246     }
 247 }
 248
 249 static void memory_region_read_accessor(void *opaque,
 250                                         target_phys_addr_t addr,
 251                                         uint64_t *value,
 252                                         unsigned size,
 253                                         unsigned shift,
 254                                         uint64_t mask)
 255 {
 256     MemoryRegion *mr = opaque;
 257     uint64_t tmp;
 258
 259     tmp = mr->ops->read(mr->opaque, addr, size);
 260     *value |= (tmp & mask) << shift;
 261 }
 262
 263 static void memory_region_write_accessor(void *opaque,
 264                                          target_phys_addr_t addr,
 265                                          uint64_t *value,
 266                                          unsigned size,
 267                                          unsigned shift,
 268                                          uint64_t mask)
 269 {
 270     MemoryRegion *mr = opaque;
 271     uint64_t tmp;
 272
 273     tmp = (*value >> shift) & mask;
 274     mr->ops->write(mr->opaque, addr, tmp, size);
 275 }
 276
 277 static void access_with_adjusted_size(target_phys_addr_t addr,
 278                                       uint64_t *value,
 279                                       unsigned size,
 280                                       unsigned access_size_min,
 281                                       unsigned access_size_max,
 282                                       void (*access)(void *opaque,
 283                                                      target_phys_addr_t addr,
 284                                                      uint64_t *value,
 285                                                      unsigned size,
 286                                                      unsigned shift,
 287                                                      uint64_t mask),
 288                                       void *opaque)
 289 {
 290     uint64_t access_mask;
 291     unsigned access_size;
 292     unsigned i;
 293
 294     if (!access_size_min) {
 295         access_size_min = 1;
 296     }
 297     if (!access_size_max) {
 298         access_size_max = 4;
 299     }
 300     access_size = MAX(MIN(size, access_size_max), access_size_min);
 301     access_mask = -1ULL >> (64 - access_size * 8);
 302     for (i = 0; i < size; i += access_size) {
 303         /* FIXME: big-endian support */
 304         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 305     }
 306 }
 307
 308 static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
 309 {
 310     MemoryRegionSection section = {
 311         .mr = fr->mr,
 312         .offset_within_address_space = int128_get64(fr->addr.start),
 313         .offset_within_region = fr->offset_in_region,
 314         .size = int128_get64(fr->addr.size),
 315     };
 316
 317     cpu_register_physical_memory_log(&section, fr->readable, fr->readonly);
 318 }
 319
 320 static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
 321 {
 322     MemoryRegionSection section = {
 323         .mr = &io_mem_unassigned,
 324         .offset_within_address_space = int128_get64(fr->addr.start),
 325         .offset_within_region = int128_get64(fr->addr.start),
 326         .size = int128_get64(fr->addr.size),
 327     };
 328
 329     cpu_register_physical_memory_log(&section, true, false);
 330 }
 331
 332 static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
 333 {
 334 }
 335
 336 static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
 337 {
 338 }
 339
 340 static void as_memory_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 341 {
 342     int r;
 343
 344     assert(fd->match_data && int128_get64(fd->addr.size) == 4);
 345
 346     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 347                                     fd->data, true);
 348     if (r < 0) {
 349         abort();
 350     }
 351 }
 352
 353 static void as_memory_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 354 {
 355     int r;
 356
 357     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 358                                     fd->data, false);
 359     if (r < 0) {
 360         abort();
 361     }
 362 }
 363
 364 static const AddressSpaceOps address_space_ops_memory = {
 365     .range_add = as_memory_range_add,
 366     .range_del = as_memory_range_del,
 367     .log_start = as_memory_log_start,
 368     .log_stop = as_memory_log_stop,
 369     .ioeventfd_add = as_memory_ioeventfd_add,
 370     .ioeventfd_del = as_memory_ioeventfd_del,
 371 };
 372
 373 static AddressSpace address_space_memory = {
 374     .ops = &address_space_ops_memory,
 375 };
 376
 377 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 378                                              unsigned width, bool write)
 379 {
 380     const MemoryRegionPortio *mrp;
 381
 382     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 383         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 384             && width == mrp->size
 385             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 386             return mrp;
 387         }
 388     }
 389     return NULL;
 390 }
 391
 392 static void memory_region_iorange_read(IORange *iorange,
 393                                        uint64_t offset,
 394                                        unsigned width,
 395                                        uint64_t *data)
 396 {
 397     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 398
 399     if (mr->ops->old_portio) {
 400         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, false);
 401
 402         *data = ((uint64_t)1 << (width * 8)) - 1;
 403         if (mrp) {
 404             *data = mrp->read(mr->opaque, offset + mr->offset);
 405         } else if (width == 2) {
 406             mrp = find_portio(mr, offset, 1, false);
 407             assert(mrp);
 408             *data = mrp->read(mr->opaque, offset + mr->offset) |
 409                     (mrp->read(mr->opaque, offset + mr->offset + 1) << 8);
 410         }
 411         return;
 412     }
 413     *data = 0;
 414     access_with_adjusted_size(offset + mr->offset, data, width,
 415                               mr->ops->impl.min_access_size,
 416                               mr->ops->impl.max_access_size,
 417                               memory_region_read_accessor, mr);
 418 }
 419
 420 static void memory_region_iorange_write(IORange *iorange,
 421                                         uint64_t offset,
 422                                         unsigned width,
 423                                         uint64_t data)
 424 {
 425     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 426
 427     if (mr->ops->old_portio) {
 428         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, true);
 429
 430         if (mrp) {
 431             mrp->write(mr->opaque, offset + mr->offset, data);
 432         } else if (width == 2) {
 433             mrp = find_portio(mr, offset, 1, false);
 434             assert(mrp);
 435             mrp->write(mr->opaque, offset + mr->offset, data & 0xff);
 436             mrp->write(mr->opaque, offset + mr->offset + 1, data >> 8);
 437         }
 438         return;
 439     }
 440     access_with_adjusted_size(offset + mr->offset, &data, width,
 441                               mr->ops->impl.min_access_size,
 442                               mr->ops->impl.max_access_size,
 443                               memory_region_write_accessor, mr);
 444 }
 445
 446 static const IORangeOps memory_region_iorange_ops = {
 447     .read = memory_region_iorange_read,
 448     .write = memory_region_iorange_write,
 449 };
 450
 451 static void as_io_range_add(AddressSpace *as, FlatRange *fr)
 452 {
 453     iorange_init(&fr->mr->iorange, &memory_region_iorange_ops,
 454                  int128_get64(fr->addr.start), int128_get64(fr->addr.size));
 455     ioport_register(&fr->mr->iorange);
 456 }
 457
 458 static void as_io_range_del(AddressSpace *as, FlatRange *fr)
 459 {
 460     isa_unassign_ioport(int128_get64(fr->addr.start),
 461                         int128_get64(fr->addr.size));
 462 }
 463
 464 static void as_io_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 465 {
 466     int r;
 467
 468     assert(fd->match_data && int128_get64(fd->addr.size) == 2);
 469
 470     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 471                                    fd->data, true);
 472     if (r < 0) {
 473         abort();
 474     }
 475 }
 476
 477 static void as_io_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 478 {
 479     int r;
 480
 481     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 482                                    fd->data, false);
 483     if (r < 0) {
 484         abort();
 485     }
 486 }
 487
 488 static const AddressSpaceOps address_space_ops_io = {
 489     .range_add = as_io_range_add,
 490     .range_del = as_io_range_del,
 491     .ioeventfd_add = as_io_ioeventfd_add,
 492     .ioeventfd_del = as_io_ioeventfd_del,
 493 };
 494
 495 static AddressSpace address_space_io = {
 496     .ops = &address_space_ops_io,
 497 };
 498
 499 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 500 {
 501     while (mr->parent) {
 502         mr = mr->parent;
 503     }
 504     if (mr == address_space_memory.root) {
 505         return &address_space_memory;
 506     }
 507     if (mr == address_space_io.root) {
 508         return &address_space_io;
 509     }
 510     abort();
 511 }
 512
 513 /* Render a memory region into the global view.  Ranges in @view obscure
 514  * ranges in @mr.
 515  */
 516 static void render_memory_region(FlatView *view,
 517                                  MemoryRegion *mr,
 518                                  Int128 base,
 519                                  AddrRange clip,
 520                                  bool readonly)
 521 {
 522     MemoryRegion *subregion;
 523     unsigned i;
 524     target_phys_addr_t offset_in_region;
 525     Int128 remain;
 526     Int128 now;
 527     FlatRange fr;
 528     AddrRange tmp;
 529
 530     if (!mr->enabled) {
 531         return;
 532     }
 533
 534     int128_addto(&base, int128_make64(mr->addr));
 535     readonly |= mr->readonly;
 536
 537     tmp = addrrange_make(base, mr->size);
 538
 539     if (!addrrange_intersects(tmp, clip)) {
 540         return;
 541     }
 542
 543     clip = addrrange_intersection(tmp, clip);
 544
 545     if (mr->alias) {
 546         int128_subfrom(&base, int128_make64(mr->alias->addr));
 547         int128_subfrom(&base, int128_make64(mr->alias_offset));
 548         render_memory_region(view, mr->alias, base, clip, readonly);
 549         return;
 550     }
 551
 552     /* Render subregions in priority order. */
 553     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 554         render_memory_region(view, subregion, base, clip, readonly);
 555     }
 556
 557     if (!mr->terminates) {
 558         return;
 559     }
 560
 561     offset_in_region = int128_get64(int128_sub(clip.start, base));
 562     base = clip.start;
 563     remain = clip.size;
 564
 565     /* Render the region itself into any gaps left by the current view. */
 566     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 567         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 568             continue;
 569         }
 570         if (int128_lt(base, view->ranges[i].addr.start)) {
 571             now = int128_min(remain,
 572                              int128_sub(view->ranges[i].addr.start, base));
 573             fr.mr = mr;
 574             fr.offset_in_region = offset_in_region;
 575             fr.addr = addrrange_make(base, now);
 576             fr.dirty_log_mask = mr->dirty_log_mask;
 577             fr.readable = mr->readable;
 578             fr.readonly = readonly;
 579             flatview_insert(view, i, &fr);
 580             ++i;
 581             int128_addto(&base, now);
 582             offset_in_region += int128_get64(now);
 583             int128_subfrom(&remain, now);
 584         }
 585         if (int128_eq(base, view->ranges[i].addr.start)) {
 586             now = int128_min(remain, view->ranges[i].addr.size);
 587             int128_addto(&base, now);
 588             offset_in_region += int128_get64(now);
 589             int128_subfrom(&remain, now);
 590         }
 591     }
 592     if (int128_nz(remain)) {
 593         fr.mr = mr;
 594         fr.offset_in_region = offset_in_region;
 595         fr.addr = addrrange_make(base, remain);
 596         fr.dirty_log_mask = mr->dirty_log_mask;
 597         fr.readable = mr->readable;
 598         fr.readonly = readonly;
 599         flatview_insert(view, i, &fr);
 600     }
 601 }
 602
 603 /* Render a memory topology into a list of disjoint absolute ranges. */
 604 static FlatView generate_memory_topology(MemoryRegion *mr)
 605 {
 606     FlatView view;
 607
 608     flatview_init(&view);
 609
 610     render_memory_region(&view, mr, int128_zero(),
 611                          addrrange_make(int128_zero(), int128_2_64()), false);
 612     flatview_simplify(&view);
 613
 614     return view;
 615 }
 616
 617 static void address_space_add_del_ioeventfds(AddressSpace *as,
 618                                              MemoryRegionIoeventfd *fds_new,
 619                                              unsigned fds_new_nb,
 620                                              MemoryRegionIoeventfd *fds_old,
 621                                              unsigned fds_old_nb)
 622 {
 623     unsigned iold, inew;
 624
 625     /* Generate a symmetric difference of the old and new fd sets, adding
 626      * and deleting as necessary.
 627      */
 628
 629     iold = inew = 0;
 630     while (iold < fds_old_nb || inew < fds_new_nb) {
 631         if (iold < fds_old_nb
 632             && (inew == fds_new_nb
 633                 || memory_region_ioeventfd_before(fds_old[iold],
 634                                                   fds_new[inew]))) {
 635             as->ops->ioeventfd_del(as, &fds_old[iold]);
 636             ++iold;
 637         } else if (inew < fds_new_nb
 638                    && (iold == fds_old_nb
 639                        || memory_region_ioeventfd_before(fds_new[inew],
 640                                                          fds_old[iold]))) {
 641             as->ops->ioeventfd_add(as, &fds_new[inew]);
 642             ++inew;
 643         } else {
 644             ++iold;
 645             ++inew;
 646         }
 647     }
 648 }
 649
 650 static void address_space_update_ioeventfds(AddressSpace *as)
 651 {
 652     FlatRange *fr;
 653     unsigned ioeventfd_nb = 0;
 654     MemoryRegionIoeventfd *ioeventfds = NULL;
 655     AddrRange tmp;
 656     unsigned i;
 657
 658     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
 659         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 660             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 661                                   int128_sub(fr->addr.start,
 662                                              int128_make64(fr->offset_in_region)));
 663             if (addrrange_intersects(fr->addr, tmp)) {
 664                 ++ioeventfd_nb;
 665                 ioeventfds = g_realloc(ioeventfds,
 666                                           ioeventfd_nb * sizeof(*ioeventfds));
 667                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 668                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 669             }
 670         }
 671     }
 672
 673     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 674                                      as->ioeventfds, as->ioeventfd_nb);
 675
 676     g_free(as->ioeventfds);
 677     as->ioeventfds = ioeventfds;
 678     as->ioeventfd_nb = ioeventfd_nb;
 679 }
 680
 681 typedef void ListenerCallback(MemoryListener *listener,
 682                               MemoryRegionSection *mrs);
 683
 684 /* Want "void (&MemoryListener::*callback)(const MemoryRegionSection& s)" */
 685 static void memory_listener_update_region(FlatRange *fr, AddressSpace *as,
 686                                           size_t callback_offset)
 687 {
 688     MemoryRegionSection section = {
 689         .mr = fr->mr,
 690         .address_space = as->root,
 691         .offset_within_region = fr->offset_in_region,
 692         .size = int128_get64(fr->addr.size),
 693         .offset_within_address_space = int128_get64(fr->addr.start),
 694     };
 695     MemoryListener *listener;
 696
 697     QLIST_FOREACH(listener, &memory_listeners, link) {
 698         ListenerCallback *callback
 699             = *(ListenerCallback **)((void *)listener + callback_offset);
 700         callback(listener, &section);
 701     }
 702 }
 703
 704 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, callback) \
 705     memory_listener_update_region(fr, as, offsetof(MemoryListener, callback))
 706
 707 static void address_space_update_topology_pass(AddressSpace *as,
 708                                                FlatView old_view,
 709                                                FlatView new_view,
 710                                                bool adding)
 711 {
 712     unsigned iold, inew;
 713     FlatRange *frold, *frnew;
 714
 715     /* Generate a symmetric difference of the old and new memory maps.
 716      * Kill ranges in the old map, and instantiate ranges in the new map.
 717      */
 718     iold = inew = 0;
 719     while (iold < old_view.nr || inew < new_view.nr) {
 720         if (iold < old_view.nr) {
 721             frold = &old_view.ranges[iold];
 722         } else {
 723             frold = NULL;
 724         }
 725         if (inew < new_view.nr) {
 726             frnew = &new_view.ranges[inew];
 727         } else {
 728             frnew = NULL;
 729         }
 730
 731         if (frold
 732             && (!frnew
 733                 || int128_lt(frold->addr.start, frnew->addr.start)
 734                 || (int128_eq(frold->addr.start, frnew->addr.start)
 735                     && !flatrange_equal(frold, frnew)))) {
 736             /* In old, but (not in new, or in new but attributes changed). */
 737
 738             if (!adding) {
 739                 MEMORY_LISTENER_UPDATE_REGION(frold, as, region_del);
 740                 as->ops->range_del(as, frold);
 741             }
 742
 743             ++iold;
 744         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 745             /* In both (logging may have changed) */
 746
 747             if (adding) {
 748                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 749                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_stop);
 750                     as->ops->log_stop(as, frnew);
 751                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 752                     as->ops->log_start(as, frnew);
 753                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_start);
 754                 }
 755             }
 756
 757             ++iold;
 758             ++inew;
 759         } else {
 760             /* In new */
 761
 762             if (adding) {
 763                 as->ops->range_add(as, frnew);
 764                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, region_add);
 765             }
 766
 767             ++inew;
 768         }
 769     }
 770 }
 771
 772
 773 static void address_space_update_topology(AddressSpace *as)
 774 {
 775     FlatView old_view = as->current_map;
 776     FlatView new_view = generate_memory_topology(as->root);
 777
 778     address_space_update_topology_pass(as, old_view, new_view, false);
 779     address_space_update_topology_pass(as, old_view, new_view, true);
 780
 781     as->current_map = new_view;
 782     flatview_destroy(&old_view);
 783     address_space_update_ioeventfds(as);
 784 }
 785
 786 static void memory_region_update_topology(MemoryRegion *mr)
 787 {
 788     if (memory_region_transaction_depth) {
 789         memory_region_update_pending |= !mr || mr->enabled;
 790         return;
 791     }
 792
 793     if (mr && !mr->enabled) {
 794         return;
 795     }
 796
 797     if (address_space_memory.root) {
 798         address_space_update_topology(&address_space_memory);
 799     }
 800     if (address_space_io.root) {
 801         address_space_update_topology(&address_space_io);
 802     }
 803
 804     memory_region_update_pending = false;
 805 }
 806
 807 void memory_region_transaction_begin(void)
 808 {
 809     ++memory_region_transaction_depth;
 810 }
 811
 812 void memory_region_transaction_commit(void)
 813 {
 814     assert(memory_region_transaction_depth);
 815     --memory_region_transaction_depth;
 816     if (!memory_region_transaction_depth && memory_region_update_pending) {
 817         memory_region_update_topology(NULL);
 818     }
 819 }
 820
 821 static void memory_region_destructor_none(MemoryRegion *mr)
 822 {
 823 }
 824
 825 static void memory_region_destructor_ram(MemoryRegion *mr)
 826 {
 827     qemu_ram_free(mr->ram_addr);
 828 }
 829
 830 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 831 {
 832     qemu_ram_free_from_ptr(mr->ram_addr);
 833 }
 834
 835 static void memory_region_destructor_iomem(MemoryRegion *mr)
 836 {
 837     cpu_unregister_io_memory(mr->ram_addr);
 838 }
 839
 840 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 841 {
 842     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 843     cpu_unregister_io_memory(mr->ram_addr & ~TARGET_PAGE_MASK);
 844 }
 845
 846 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 847 {
 848 #ifdef TARGET_WORDS_BIGENDIAN
 849     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 850 #else
 851     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 852 #endif
 853 }
 854
 855 void memory_region_init(MemoryRegion *mr,
 856                         const char *name,
 857                         uint64_t size)
 858 {
 859     mr->ops = NULL;
 860     mr->parent = NULL;
 861     mr->size = int128_make64(size);
 862     if (size == UINT64_MAX) {
 863         mr->size = int128_2_64();
 864     }
 865     mr->addr = 0;
 866     mr->offset = 0;
 867     mr->subpage = false;
 868     mr->enabled = true;
 869     mr->terminates = false;
 870     mr->ram = false;
 871     mr->readable = true;
 872     mr->readonly = false;
 873     mr->rom_device = false;
 874     mr->destructor = memory_region_destructor_none;
 875     mr->priority = 0;
 876     mr->may_overlap = false;
 877     mr->alias = NULL;
 878     QTAILQ_INIT(&mr->subregions);
 879     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 880     QTAILQ_INIT(&mr->coalesced);
 881     mr->name = g_strdup(name);
 882     mr->dirty_log_mask = 0;
 883     mr->ioeventfd_nb = 0;
 884     mr->ioeventfds = NULL;
 885 }
 886
 887 static bool memory_region_access_valid(MemoryRegion *mr,
 888                                        target_phys_addr_t addr,
 889                                        unsigned size,
 890                                        bool is_write)
 891 {
 892     if (mr->ops->valid.accepts
 893         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 894         return false;
 895     }
 896
 897     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 898         return false;
 899     }
 900
 901     /* Treat zero as compatibility all valid */
 902     if (!mr->ops->valid.max_access_size) {
 903         return true;
 904     }
 905
 906     if (size > mr->ops->valid.max_access_size
 907         || size < mr->ops->valid.min_access_size) {
 908         return false;
 909     }
 910     return true;
 911 }
 912
 913 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 914                                              target_phys_addr_t addr,
 915                                              unsigned size)
 916 {
 917     uint64_t data = 0;
 918
 919     if (!memory_region_access_valid(mr, addr, size, false)) {
 920         return -1U; /* FIXME: better signalling */
 921     }
 922
 923     if (!mr->ops->read) {
 924         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 925     }
 926
 927     /* FIXME: support unaligned access */
 928     access_with_adjusted_size(addr + mr->offset, &data, size,
 929                               mr->ops->impl.min_access_size,
 930                               mr->ops->impl.max_access_size,
 931                               memory_region_read_accessor, mr);
 932
 933     return data;
 934 }
 935
 936 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 937 {
 938     if (memory_region_wrong_endianness(mr)) {
 939         switch (size) {
 940         case 1:
 941             break;
 942         case 2:
 943             *data = bswap16(*data);
 944             break;
 945         case 4:
 946             *data = bswap32(*data);
 947             break;
 948         default:
 949             abort();
 950         }
 951     }
 952 }
 953
 954 static uint64_t memory_region_dispatch_read(MemoryRegion *mr,
 955                                             target_phys_addr_t addr,
 956                                             unsigned size)
 957 {
 958     uint64_t ret;
 959
 960     ret = memory_region_dispatch_read1(mr, addr, size);
 961     adjust_endianness(mr, &ret, size);
 962     return ret;
 963 }
 964
 965 static void memory_region_dispatch_write(MemoryRegion *mr,
 966                                          target_phys_addr_t addr,
 967                                          uint64_t data,
 968                                          unsigned size)
 969 {
 970     if (!memory_region_access_valid(mr, addr, size, true)) {
 971         return; /* FIXME: better signalling */
 972     }
 973
 974     adjust_endianness(mr, &data, size);
 975
 976     if (!mr->ops->write) {
 977         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 978         return;
 979     }
 980
 981     /* FIXME: support unaligned access */
 982     access_with_adjusted_size(addr + mr->offset, &data, size,
 983                               mr->ops->impl.min_access_size,
 984                               mr->ops->impl.max_access_size,
 985                               memory_region_write_accessor, mr);
 986 }
 987
 988 void memory_region_init_io(MemoryRegion *mr,
 989                            const MemoryRegionOps *ops,
 990                            void *opaque,
 991                            const char *name,
 992                            uint64_t size)
 993 {
 994     memory_region_init(mr, name, size);
 995     mr->ops = ops;
 996     mr->opaque = opaque;
 997     mr->terminates = true;
 998     mr->destructor = memory_region_destructor_iomem;
 999     mr->ram_addr = cpu_register_io_memory(mr);
1000 }
1001
1002 void memory_region_init_ram(MemoryRegion *mr,
1003                             const char *name,
1004                             uint64_t size)
1005 {
1006     memory_region_init(mr, name, size);
1007     mr->ram = true;
1008     mr->terminates = true;
1009     mr->destructor = memory_region_destructor_ram;
1010     mr->ram_addr = qemu_ram_alloc(size, mr);
1011 }
1012
1013 void memory_region_init_ram_ptr(MemoryRegion *mr,
1014                                 const char *name,
1015                                 uint64_t size,
1016                                 void *ptr)
1017 {
1018     memory_region_init(mr, name, size);
1019     mr->ram = true;
1020     mr->terminates = true;
1021     mr->destructor = memory_region_destructor_ram_from_ptr;
1022     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
1023 }
1024
1025 void memory_region_init_alias(MemoryRegion *mr,
1026                               const char *name,
1027                               MemoryRegion *orig,
1028                               target_phys_addr_t offset,
1029                               uint64_t size)
1030 {
1031     memory_region_init(mr, name, size);
1032     mr->alias = orig;
1033     mr->alias_offset = offset;
1034 }
1035
1036 void memory_region_init_rom_device(MemoryRegion *mr,
1037                                    const MemoryRegionOps *ops,
1038                                    void *opaque,
1039                                    const char *name,
1040                                    uint64_t size)
1041 {
1042     memory_region_init(mr, name, size);
1043     mr->ops = ops;
1044     mr->opaque = opaque;
1045     mr->terminates = true;
1046     mr->rom_device = true;
1047     mr->destructor = memory_region_destructor_rom_device;
1048     mr->ram_addr = qemu_ram_alloc(size, mr);
1049     mr->ram_addr |= cpu_register_io_memory(mr);
1050 }
1051
1052 static uint64_t invalid_read(void *opaque, target_phys_addr_t addr,
1053                              unsigned size)
1054 {
1055     MemoryRegion *mr = opaque;
1056
1057     if (!mr->warning_printed) {
1058         fprintf(stderr, "Invalid read from memory region %s\n", mr->name);
1059         mr->warning_printed = true;
1060     }
1061     return -1U;
1062 }
1063
1064 static void invalid_write(void *opaque, target_phys_addr_t addr, uint64_t data,
1065                           unsigned size)
1066 {
1067     MemoryRegion *mr = opaque;
1068
1069     if (!mr->warning_printed) {
1070         fprintf(stderr, "Invalid write to memory region %s\n", mr->name);
1071         mr->warning_printed = true;
1072     }
1073 }
1074
1075 static const MemoryRegionOps reservation_ops = {
1076     .read = invalid_read,
1077     .write = invalid_write,
1078     .endianness = DEVICE_NATIVE_ENDIAN,
1079 };
1080
1081 void memory_region_init_reservation(MemoryRegion *mr,
1082                                     const char *name,
1083                                     uint64_t size)
1084 {
1085     memory_region_init_io(mr, &reservation_ops, mr, name, size);
1086 }
1087
1088 void memory_region_destroy(MemoryRegion *mr)
1089 {
1090     assert(QTAILQ_EMPTY(&mr->subregions));
1091     mr->destructor(mr);
1092     memory_region_clear_coalescing(mr);
1093     g_free((char *)mr->name);
1094     g_free(mr->ioeventfds);
1095 }
1096
1097 uint64_t memory_region_size(MemoryRegion *mr)
1098 {
1099     if (int128_eq(mr->size, int128_2_64())) {
1100         return UINT64_MAX;
1101     }
1102     return int128_get64(mr->size);
1103 }
1104
1105 const char *memory_region_name(MemoryRegion *mr)
1106 {
1107     return mr->name;
1108 }
1109
1110 bool memory_region_is_ram(MemoryRegion *mr)
1111 {
1112     return mr->ram;
1113 }
1114
1115 bool memory_region_is_logging(MemoryRegion *mr)
1116 {
1117     return mr->dirty_log_mask;
1118 }
1119
1120 bool memory_region_is_rom(MemoryRegion *mr)
1121 {
1122     return mr->ram && mr->readonly;
1123 }
1124
1125 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
1126 {
1127     mr->offset = offset;
1128 }
1129
1130 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1131 {
1132     uint8_t mask = 1 << client;
1133
1134     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1135     memory_region_update_topology(mr);
1136 }
1137
1138 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1139                              unsigned client)
1140 {
1141     assert(mr->terminates);
1142     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, 1 << client);
1143 }
1144
1145 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1146                              target_phys_addr_t size)
1147 {
1148     assert(mr->terminates);
1149     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1150 }
1151
1152 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1153 {
1154     FlatRange *fr;
1155
1156     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1157         if (fr->mr == mr) {
1158             MEMORY_LISTENER_UPDATE_REGION(fr, &address_space_memory, log_sync);
1159         }
1160     }
1161 }
1162
1163 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1164 {
1165     if (mr->readonly != readonly) {
1166         mr->readonly = readonly;
1167         memory_region_update_topology(mr);
1168     }
1169 }
1170
1171 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1172 {
1173     if (mr->readable != readable) {
1174         mr->readable = readable;
1175         memory_region_update_topology(mr);
1176     }
1177 }
1178
1179 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1180                                target_phys_addr_t size, unsigned client)
1181 {
1182     assert(mr->terminates);
1183     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1184                                     mr->ram_addr + addr + size,
1185                                     1 << client);
1186 }
1187
1188 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1189 {
1190     if (mr->alias) {
1191         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1192     }
1193
1194     assert(mr->terminates);
1195
1196     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1197 }
1198
1199 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1200 {
1201     FlatRange *fr;
1202     CoalescedMemoryRange *cmr;
1203     AddrRange tmp;
1204
1205     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1206         if (fr->mr == mr) {
1207             qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
1208                                            int128_get64(fr->addr.size));
1209             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1210                 tmp = addrrange_shift(cmr->addr,
1211                                       int128_sub(fr->addr.start,
1212                                                  int128_make64(fr->offset_in_region)));
1213                 if (!addrrange_intersects(tmp, fr->addr)) {
1214                     continue;
1215                 }
1216                 tmp = addrrange_intersection(tmp, fr->addr);
1217                 qemu_register_coalesced_mmio(int128_get64(tmp.start),
1218                                              int128_get64(tmp.size));
1219             }
1220         }
1221     }
1222 }
1223
1224 void memory_region_set_coalescing(MemoryRegion *mr)
1225 {
1226     memory_region_clear_coalescing(mr);
1227     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1228 }
1229
1230 void memory_region_add_coalescing(MemoryRegion *mr,
1231                                   target_phys_addr_t offset,
1232                                   uint64_t size)
1233 {
1234     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1235
1236     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1237     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1238     memory_region_update_coalesced_range(mr);
1239 }
1240
1241 void memory_region_clear_coalescing(MemoryRegion *mr)
1242 {
1243     CoalescedMemoryRange *cmr;
1244
1245     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1246         cmr = QTAILQ_FIRST(&mr->coalesced);
1247         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1248         g_free(cmr);
1249     }
1250     memory_region_update_coalesced_range(mr);
1251 }
1252
1253 void memory_region_add_eventfd(MemoryRegion *mr,
1254                                target_phys_addr_t addr,
1255                                unsigned size,
1256                                bool match_data,
1257                                uint64_t data,
1258                                int fd)
1259 {
1260     MemoryRegionIoeventfd mrfd = {
1261         .addr.start = int128_make64(addr),
1262         .addr.size = int128_make64(size),
1263         .match_data = match_data,
1264         .data = data,
1265         .fd = fd,
1266     };
1267     unsigned i;
1268
1269     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1270         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1271             break;
1272         }
1273     }
1274     ++mr->ioeventfd_nb;
1275     mr->ioeventfds = g_realloc(mr->ioeventfds,
1276                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1277     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1278             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1279     mr->ioeventfds[i] = mrfd;
1280     memory_region_update_topology(mr);
1281 }
1282
1283 void memory_region_del_eventfd(MemoryRegion *mr,
1284                                target_phys_addr_t addr,
1285                                unsigned size,
1286                                bool match_data,
1287                                uint64_t data,
1288                                int fd)
1289 {
1290     MemoryRegionIoeventfd mrfd = {
1291         .addr.start = int128_make64(addr),
1292         .addr.size = int128_make64(size),
1293         .match_data = match_data,
1294         .data = data,
1295         .fd = fd,
1296     };
1297     unsigned i;
1298
1299     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1300         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1301             break;
1302         }
1303     }
1304     assert(i != mr->ioeventfd_nb);
1305     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1306             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1307     --mr->ioeventfd_nb;
1308     mr->ioeventfds = g_realloc(mr->ioeventfds,
1309                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1310     memory_region_update_topology(mr);
1311 }
1312
1313 static void memory_region_add_subregion_common(MemoryRegion *mr,
1314                                                target_phys_addr_t offset,
1315                                                MemoryRegion *subregion)
1316 {
1317     MemoryRegion *other;
1318
1319     assert(!subregion->parent);
1320     subregion->parent = mr;
1321     subregion->addr = offset;
1322     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1323         if (subregion->may_overlap || other->may_overlap) {
1324             continue;
1325         }
1326         if (int128_gt(int128_make64(offset),
1327                       int128_add(int128_make64(other->addr), other->size))
1328             || int128_le(int128_add(int128_make64(offset), subregion->size),
1329                          int128_make64(other->addr))) {
1330             continue;
1331         }
1332 #if 0
1333         printf("warning: subregion collision %llx/%llx (%s) "
1334                "vs %llx/%llx (%s)\n",
1335                (unsigned long long)offset,
1336                (unsigned long long)int128_get64(subregion->size),
1337                subregion->name,
1338                (unsigned long long)other->addr,
1339                (unsigned long long)int128_get64(other->size),
1340                other->name);
1341 #endif
1342     }
1343     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1344         if (subregion->priority >= other->priority) {
1345             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1346             goto done;
1347         }
1348     }
1349     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1350 done:
1351     memory_region_update_topology(mr);
1352 }
1353
1354
1355 void memory_region_add_subregion(MemoryRegion *mr,
1356                                  target_phys_addr_t offset,
1357                                  MemoryRegion *subregion)
1358 {
1359     subregion->may_overlap = false;
1360     subregion->priority = 0;
1361     memory_region_add_subregion_common(mr, offset, subregion);
1362 }
1363
1364 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1365                                          target_phys_addr_t offset,
1366                                          MemoryRegion *subregion,
1367                                          unsigned priority)
1368 {
1369     subregion->may_overlap = true;
1370     subregion->priority = priority;
1371     memory_region_add_subregion_common(mr, offset, subregion);
1372 }
1373
1374 void memory_region_del_subregion(MemoryRegion *mr,
1375                                  MemoryRegion *subregion)
1376 {
1377     assert(subregion->parent == mr);
1378     subregion->parent = NULL;
1379     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1380     memory_region_update_topology(mr);
1381 }
1382
1383 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1384 {
1385     if (enabled == mr->enabled) {
1386         return;
1387     }
1388     mr->enabled = enabled;
1389     memory_region_update_topology(NULL);
1390 }
1391
1392 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
1393 {
1394     MemoryRegion *parent = mr->parent;
1395     unsigned priority = mr->priority;
1396     bool may_overlap = mr->may_overlap;
1397
1398     if (addr == mr->addr || !parent) {
1399         mr->addr = addr;
1400         return;
1401     }
1402
1403     memory_region_transaction_begin();
1404     memory_region_del_subregion(parent, mr);
1405     if (may_overlap) {
1406         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1407     } else {
1408         memory_region_add_subregion(parent, addr, mr);
1409     }
1410     memory_region_transaction_commit();
1411 }
1412
1413 void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
1414 {
1415     target_phys_addr_t old_offset = mr->alias_offset;
1416
1417     assert(mr->alias);
1418     mr->alias_offset = offset;
1419
1420     if (offset == old_offset || !mr->parent) {
1421         return;
1422     }
1423
1424     memory_region_update_topology(mr);
1425 }
1426
1427 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1428 {
1429     return mr->ram_addr;
1430 }
1431
1432 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1433 {
1434     const AddrRange *addr = addr_;
1435     const FlatRange *fr = fr_;
1436
1437     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1438         return -1;
1439     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1440         return 1;
1441     }
1442     return 0;
1443 }
1444
1445 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1446 {
1447     return bsearch(&addr, as->current_map.ranges, as->current_map.nr,
1448                    sizeof(FlatRange), cmp_flatrange_addr);
1449 }
1450
1451 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1452                                        target_phys_addr_t addr, uint64_t size)
1453 {
1454     AddressSpace *as = memory_region_to_address_space(address_space);
1455     AddrRange range = addrrange_make(int128_make64(addr),
1456                                      int128_make64(size));
1457     FlatRange *fr = address_space_lookup(as, range);
1458     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1459
1460     if (!fr) {
1461         return ret;
1462     }
1463
1464     while (fr > as->current_map.ranges
1465            && addrrange_intersects(fr[-1].addr, range)) {
1466         --fr;
1467     }
1468
1469     ret.mr = fr->mr;
1470     range = addrrange_intersection(range, fr->addr);
1471     ret.offset_within_region = fr->offset_in_region;
1472     ret.offset_within_region += int128_get64(int128_sub(range.start,
1473                                                         fr->addr.start));
1474     ret.size = int128_get64(range.size);
1475     ret.offset_within_address_space = int128_get64(range.start);
1476     return ret;
1477 }
1478
1479 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1480 {
1481     AddressSpace *as = memory_region_to_address_space(address_space);
1482     FlatRange *fr;
1483
1484     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1485         MEMORY_LISTENER_UPDATE_REGION(fr, as, log_sync);
1486     }
1487 }
1488
1489 void memory_global_dirty_log_start(void)
1490 {
1491     MemoryListener *listener;
1492
1493     cpu_physical_memory_set_dirty_tracking(1);
1494     global_dirty_log = true;
1495     QLIST_FOREACH(listener, &memory_listeners, link) {
1496         listener->log_global_start(listener);
1497     }
1498 }
1499
1500 void memory_global_dirty_log_stop(void)
1501 {
1502     MemoryListener *listener;
1503
1504     global_dirty_log = false;
1505     QLIST_FOREACH(listener, &memory_listeners, link) {
1506         listener->log_global_stop(listener);
1507     }
1508     cpu_physical_memory_set_dirty_tracking(0);
1509 }
1510
1511 static void listener_add_address_space(MemoryListener *listener,
1512                                        AddressSpace *as)
1513 {
1514     FlatRange *fr;
1515
1516     if (global_dirty_log) {
1517         listener->log_global_start(listener);
1518     }
1519     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1520         MemoryRegionSection section = {
1521             .mr = fr->mr,
1522             .address_space = as->root,
1523             .offset_within_region = fr->offset_in_region,
1524             .size = int128_get64(fr->addr.size),
1525             .offset_within_address_space = int128_get64(fr->addr.start),
1526         };
1527         listener->region_add(listener, &section);
1528     }
1529 }
1530
1531 void memory_listener_register(MemoryListener *listener)
1532 {
1533     QLIST_INSERT_HEAD(&memory_listeners, listener, link);
1534     listener_add_address_space(listener, &address_space_memory);
1535     listener_add_address_space(listener, &address_space_io);
1536 }
1537
1538 void memory_listener_unregister(MemoryListener *listener)
1539 {
1540     QLIST_REMOVE(listener, link);
1541 }
1542
1543 void set_system_memory_map(MemoryRegion *mr)
1544 {
1545     address_space_memory.root = mr;
1546     memory_region_update_topology(NULL);
1547 }
1548
1549 void set_system_io_map(MemoryRegion *mr)
1550 {
1551     address_space_io.root = mr;
1552     memory_region_update_topology(NULL);
1553 }
1554
1555 uint64_t io_mem_read(int io_index, target_phys_addr_t addr, unsigned size)
1556 {
1557     return memory_region_dispatch_read(io_mem_region[io_index], addr, size);
1558 }
1559
1560 void io_mem_write(int io_index, target_phys_addr_t addr,
1561                   uint64_t val, unsigned size)
1562 {
1563     memory_region_dispatch_write(io_mem_region[io_index], addr, val, size);
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 }