| 1 | /* |
| 2 | * Memory Device Interface |
| 3 | * |
| 4 | * Copyright ProfitBricks GmbH 2012 |
| 5 | * Copyright (C) 2014 Red Hat Inc |
| 6 | * Copyright (c) 2018 Red Hat Inc |
| 7 | * |
| 8 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 9 | * See the COPYING file in the top-level directory. |
| 10 | */ |
| 11 | |
| 12 | #include "qemu/osdep.h" |
| 13 | #include "qemu/error-report.h" |
| 14 | #include "hw/mem/memory-device.h" |
| 15 | #include "qapi/error.h" |
| 16 | #include "hw/core/boards.h" |
| 17 | #include "qemu/range.h" |
| 18 | #include "hw/virtio/vhost.h" |
| 19 | #include "system/kvm.h" |
| 20 | #include "system/address-spaces.h" |
| 21 | #include "trace.h" |
| 22 | |
| 23 | static bool memory_device_is_empty(const MemoryDeviceState *md) |
| 24 | { |
| 25 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 26 | Error *local_err = NULL; |
| 27 | MemoryRegion *mr; |
| 28 | |
| 29 | /* dropping const here is fine as we don't touch the memory region */ |
| 30 | mr = mdc->get_memory_region((MemoryDeviceState *)md, &local_err); |
| 31 | if (local_err) { |
| 32 | /* Not empty, we'll report errors later when containing the MR again. */ |
| 33 | error_free(local_err); |
| 34 | return false; |
| 35 | } |
| 36 | return !mr; |
| 37 | } |
| 38 | |
| 39 | static gint memory_device_addr_sort(gconstpointer a, gconstpointer b) |
| 40 | { |
| 41 | const MemoryDeviceState *md_a = MEMORY_DEVICE(a); |
| 42 | const MemoryDeviceState *md_b = MEMORY_DEVICE(b); |
| 43 | const MemoryDeviceClass *mdc_a = MEMORY_DEVICE_GET_CLASS(a); |
| 44 | const MemoryDeviceClass *mdc_b = MEMORY_DEVICE_GET_CLASS(b); |
| 45 | const uint64_t addr_a = mdc_a->get_addr(md_a); |
| 46 | const uint64_t addr_b = mdc_b->get_addr(md_b); |
| 47 | |
| 48 | if (addr_a > addr_b) { |
| 49 | return 1; |
| 50 | } else if (addr_a < addr_b) { |
| 51 | return -1; |
| 52 | } |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int memory_device_build_list(Object *obj, void *opaque) |
| 57 | { |
| 58 | GSList **list = opaque; |
| 59 | |
| 60 | if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) { |
| 61 | DeviceState *dev = DEVICE(obj); |
| 62 | if (qdev_is_realized(dev)) { |
| 63 | *list = g_slist_insert_sorted(*list, dev, memory_device_addr_sort); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | object_child_foreach(obj, memory_device_build_list, opaque); |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static unsigned int memory_device_get_memslots(MemoryDeviceState *md) |
| 72 | { |
| 73 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 74 | |
| 75 | if (mdc->get_memslots) { |
| 76 | return mdc->get_memslots(md); |
| 77 | } |
| 78 | return 1; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Memslots that are reserved by memory devices (required but still reported |
| 83 | * as free from KVM / vhost). |
| 84 | */ |
| 85 | static unsigned int get_reserved_memslots(MachineState *ms) |
| 86 | { |
| 87 | if (ms->device_memory->used_memslots > |
| 88 | ms->device_memory->required_memslots) { |
| 89 | /* This is unexpected, and we warned already in the memory notifier. */ |
| 90 | return 0; |
| 91 | } |
| 92 | return ms->device_memory->required_memslots - |
| 93 | ms->device_memory->used_memslots; |
| 94 | } |
| 95 | |
| 96 | unsigned int memory_devices_get_reserved_memslots(void) |
| 97 | { |
| 98 | if (!current_machine->device_memory) { |
| 99 | return 0; |
| 100 | } |
| 101 | return get_reserved_memslots(current_machine); |
| 102 | } |
| 103 | |
| 104 | bool memory_devices_memslot_auto_decision_active(void) |
| 105 | { |
| 106 | if (!current_machine->device_memory) { |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | return current_machine->device_memory->memslot_auto_decision_active; |
| 111 | } |
| 112 | |
| 113 | static unsigned int memory_device_memslot_decision_limit(MachineState *ms, |
| 114 | MemoryRegion *mr) |
| 115 | { |
| 116 | const unsigned int reserved = get_reserved_memslots(ms); |
| 117 | const uint64_t size = memory_region_size(mr); |
| 118 | unsigned int max = vhost_get_max_memslots(); |
| 119 | unsigned int free = vhost_get_free_memslots(); |
| 120 | uint64_t available_space; |
| 121 | unsigned int memslots; |
| 122 | |
| 123 | if (kvm_enabled()) { |
| 124 | max = MIN(max, kvm_get_max_memslots()); |
| 125 | free = MIN(free, kvm_get_free_memslots()); |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * If we only have less overall memslots than what we consider reasonable, |
| 130 | * just keep it to a minimum. |
| 131 | */ |
| 132 | if (max < MEMORY_DEVICES_SAFE_MAX_MEMSLOTS) { |
| 133 | return 1; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Consider our soft-limit across all memory devices. We don't really |
| 138 | * expect to exceed this limit in reasonable configurations. |
| 139 | */ |
| 140 | if (MEMORY_DEVICES_SOFT_MEMSLOT_LIMIT <= |
| 141 | ms->device_memory->required_memslots) { |
| 142 | return 1; |
| 143 | } |
| 144 | memslots = MEMORY_DEVICES_SOFT_MEMSLOT_LIMIT - |
| 145 | ms->device_memory->required_memslots; |
| 146 | |
| 147 | /* |
| 148 | * Consider the actually still free memslots. This is only relevant if |
| 149 | * other memslot consumers would consume *significantly* more memslots than |
| 150 | * what we prepared for (> 253). Unlikely, but let's just handle it |
| 151 | * cleanly. |
| 152 | */ |
| 153 | memslots = MIN(memslots, free - reserved); |
| 154 | if (memslots < 1 || unlikely(free < reserved)) { |
| 155 | return 1; |
| 156 | } |
| 157 | |
| 158 | /* We cannot have any other memory devices? So give all to this device. */ |
| 159 | if (size == ms->maxram_size - ms->ram_size) { |
| 160 | return memslots; |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Simple heuristic: equally distribute the memslots over the space |
| 165 | * still available for memory devices. |
| 166 | */ |
| 167 | available_space = ms->maxram_size - ms->ram_size - |
| 168 | ms->device_memory->used_region_size; |
| 169 | memslots = (double)memslots * size / available_space; |
| 170 | return memslots < 1 ? 1 : memslots; |
| 171 | } |
| 172 | |
| 173 | static void memory_device_check_addable(MachineState *ms, MemoryDeviceState *md, |
| 174 | MemoryRegion *mr, Error **errp) |
| 175 | { |
| 176 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 177 | const uint64_t used_region_size = ms->device_memory->used_region_size; |
| 178 | const uint64_t size = memory_region_size(mr); |
| 179 | const unsigned int reserved_memslots = get_reserved_memslots(ms); |
| 180 | unsigned int required_memslots, memslot_limit; |
| 181 | |
| 182 | /* |
| 183 | * Instruct the device to decide how many memslots to use, if applicable, |
| 184 | * before we query the number of required memslots the first time. |
| 185 | */ |
| 186 | if (mdc->decide_memslots) { |
| 187 | memslot_limit = memory_device_memslot_decision_limit(ms, mr); |
| 188 | mdc->decide_memslots(md, memslot_limit); |
| 189 | } |
| 190 | required_memslots = memory_device_get_memslots(md); |
| 191 | |
| 192 | /* we will need memory slots for kvm and vhost */ |
| 193 | if (kvm_enabled() && |
| 194 | kvm_get_free_memslots() < required_memslots + reserved_memslots) { |
| 195 | error_setg(errp, "hypervisor has not enough free memory slots left"); |
| 196 | return; |
| 197 | } |
| 198 | if (vhost_get_free_memslots() < required_memslots + reserved_memslots) { |
| 199 | error_setg(errp, "a used vhost backend has not enough free memory slots left"); |
| 200 | return; |
| 201 | } |
| 202 | |
| 203 | /* will we exceed the total amount of memory specified */ |
| 204 | if (used_region_size + size < used_region_size || |
| 205 | used_region_size + size > ms->maxram_size - ms->ram_size) { |
| 206 | error_setg(errp, "not enough space, currently 0x%" PRIx64 |
| 207 | " in use of total space for memory devices 0x" RAM_ADDR_FMT, |
| 208 | used_region_size, ms->maxram_size - ms->ram_size); |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | } |
| 213 | |
| 214 | static uint64_t memory_device_get_free_addr(MachineState *ms, |
| 215 | const uint64_t *hint, |
| 216 | uint64_t align, uint64_t size, |
| 217 | Error **errp) |
| 218 | { |
| 219 | GSList *list = NULL, *item; |
| 220 | Range as, new = range_empty; |
| 221 | |
| 222 | range_init_nofail(&as, ms->device_memory->base, |
| 223 | memory_region_size(&ms->device_memory->mr)); |
| 224 | |
| 225 | /* start of address space indicates the maximum alignment we expect */ |
| 226 | if (!QEMU_IS_ALIGNED(range_lob(&as), align)) { |
| 227 | warn_report("the alignment (0x%" PRIx64 ") exceeds the expected" |
| 228 | " maximum alignment, memory will get fragmented and not" |
| 229 | " all 'maxmem' might be usable for memory devices.", |
| 230 | align); |
| 231 | } |
| 232 | |
| 233 | if (hint && !QEMU_IS_ALIGNED(*hint, align)) { |
| 234 | error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes", |
| 235 | align); |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | if (hint) { |
| 240 | if (range_init(&new, *hint, size) || !range_contains_range(&as, &new)) { |
| 241 | error_setg(errp, "can't add memory device [0x%" PRIx64 ":0x%" PRIx64 |
| 242 | "], usable range for memory devices [0x%" PRIx64 ":0x%" |
| 243 | PRIx64 "]", *hint, size, range_lob(&as), |
| 244 | range_size(&as)); |
| 245 | return 0; |
| 246 | } |
| 247 | } else { |
| 248 | if (range_init(&new, QEMU_ALIGN_UP(range_lob(&as), align), size)) { |
| 249 | error_setg(errp, "can't add memory device, device too big"); |
| 250 | return 0; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* find address range that will fit new memory device */ |
| 255 | object_child_foreach(OBJECT(ms), memory_device_build_list, &list); |
| 256 | for (item = list; item; item = g_slist_next(item)) { |
| 257 | const MemoryDeviceState *md = item->data; |
| 258 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(OBJECT(md)); |
| 259 | uint64_t next_addr; |
| 260 | Range tmp; |
| 261 | |
| 262 | if (memory_device_is_empty(md)) { |
| 263 | continue; |
| 264 | } |
| 265 | |
| 266 | range_init_nofail(&tmp, mdc->get_addr(md), |
| 267 | memory_device_get_region_size(md, &error_abort)); |
| 268 | |
| 269 | if (range_overlaps_range(&tmp, &new)) { |
| 270 | if (hint) { |
| 271 | const DeviceState *d = DEVICE(md); |
| 272 | error_setg(errp, "address range conflicts with memory device" |
| 273 | " id='%s'", d->id ? d->id : "(unnamed)"); |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | next_addr = QEMU_ALIGN_UP(range_upb(&tmp) + 1, align); |
| 278 | if (!next_addr || range_init(&new, next_addr, range_size(&new))) { |
| 279 | range_make_empty(&new); |
| 280 | break; |
| 281 | } |
| 282 | } else if (range_lob(&tmp) > range_upb(&new)) { |
| 283 | break; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | if (!range_contains_range(&as, &new)) { |
| 288 | error_setg(errp, "could not find position in guest address space for " |
| 289 | "memory device - memory fragmented due to alignments"); |
| 290 | } |
| 291 | out: |
| 292 | g_slist_free(list); |
| 293 | return range_lob(&new); |
| 294 | } |
| 295 | |
| 296 | MemoryDeviceInfoList *qmp_memory_device_list(void) |
| 297 | { |
| 298 | GSList *devices = NULL, *item; |
| 299 | MemoryDeviceInfoList *list = NULL, **tail = &list; |
| 300 | |
| 301 | object_child_foreach(qdev_get_machine(), memory_device_build_list, |
| 302 | &devices); |
| 303 | |
| 304 | for (item = devices; item; item = g_slist_next(item)) { |
| 305 | const MemoryDeviceState *md = MEMORY_DEVICE(item->data); |
| 306 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(item->data); |
| 307 | MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1); |
| 308 | |
| 309 | /* Let's query infotmation even for empty memory devices. */ |
| 310 | mdc->fill_device_info(md, info); |
| 311 | |
| 312 | QAPI_LIST_APPEND(tail, info); |
| 313 | } |
| 314 | |
| 315 | g_slist_free(devices); |
| 316 | |
| 317 | return list; |
| 318 | } |
| 319 | |
| 320 | static int memory_device_plugged_size(Object *obj, void *opaque) |
| 321 | { |
| 322 | uint64_t *size = opaque; |
| 323 | |
| 324 | if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) { |
| 325 | const DeviceState *dev = DEVICE(obj); |
| 326 | const MemoryDeviceState *md = MEMORY_DEVICE(obj); |
| 327 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj); |
| 328 | |
| 329 | if (qdev_is_realized(dev) && !memory_device_is_empty(md)) { |
| 330 | *size += mdc->get_plugged_size(md, &error_abort); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | object_child_foreach(obj, memory_device_plugged_size, opaque); |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | uint64_t get_plugged_memory_size(void) |
| 339 | { |
| 340 | uint64_t size = 0; |
| 341 | |
| 342 | memory_device_plugged_size(qdev_get_machine(), &size); |
| 343 | |
| 344 | return size; |
| 345 | } |
| 346 | |
| 347 | void memory_device_pre_plug(MemoryDeviceState *md, MachineState *ms, |
| 348 | Error **errp) |
| 349 | { |
| 350 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 351 | Error *local_err = NULL; |
| 352 | uint64_t addr, align = 0; |
| 353 | MemoryRegion *mr; |
| 354 | |
| 355 | /* We support empty memory devices even without device memory. */ |
| 356 | if (memory_device_is_empty(md)) { |
| 357 | return; |
| 358 | } |
| 359 | |
| 360 | if (!ms->device_memory) { |
| 361 | error_setg(errp, "the configuration is not prepared for memory devices" |
| 362 | " (e.g., for memory hotplug), consider specifying the" |
| 363 | " maxmem option"); |
| 364 | return; |
| 365 | } |
| 366 | |
| 367 | mr = mdc->get_memory_region(md, &local_err); |
| 368 | if (local_err) { |
| 369 | goto out; |
| 370 | } |
| 371 | |
| 372 | memory_device_check_addable(ms, md, mr, &local_err); |
| 373 | if (local_err) { |
| 374 | goto out; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * We always want the memory region size to be multiples of the memory |
| 379 | * region alignment: for example, DIMMs with 1G+1byte size don't make |
| 380 | * any sense. Note that we don't check that the size is multiples |
| 381 | * of any additional alignment requirements the memory device might |
| 382 | * have when it comes to the address in physical address space. |
| 383 | */ |
| 384 | if (!QEMU_IS_ALIGNED(memory_region_size(mr), |
| 385 | memory_region_get_alignment(mr))) { |
| 386 | error_setg(errp, "backend memory size must be multiple of 0x%" |
| 387 | PRIx64, memory_region_get_alignment(mr)); |
| 388 | return; |
| 389 | } |
| 390 | |
| 391 | if (mdc->get_min_alignment) { |
| 392 | align = mdc->get_min_alignment(md); |
| 393 | } |
| 394 | align = MAX(align, memory_region_get_alignment(mr)); |
| 395 | addr = mdc->get_addr(md); |
| 396 | addr = memory_device_get_free_addr(ms, !addr ? NULL : &addr, align, |
| 397 | memory_region_size(mr), &local_err); |
| 398 | if (local_err) { |
| 399 | goto out; |
| 400 | } |
| 401 | mdc->set_addr(md, addr, &local_err); |
| 402 | if (!local_err) { |
| 403 | trace_memory_device_pre_plug(DEVICE(md)->id ? DEVICE(md)->id : "", |
| 404 | addr); |
| 405 | } |
| 406 | out: |
| 407 | error_propagate(errp, local_err); |
| 408 | } |
| 409 | |
| 410 | void memory_device_plug(MemoryDeviceState *md, MachineState *ms) |
| 411 | { |
| 412 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 413 | unsigned int memslots; |
| 414 | uint64_t addr; |
| 415 | MemoryRegion *mr; |
| 416 | |
| 417 | if (memory_device_is_empty(md)) { |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | memslots = memory_device_get_memslots(md); |
| 422 | addr = mdc->get_addr(md); |
| 423 | |
| 424 | /* |
| 425 | * We expect that a previous call to memory_device_pre_plug() succeeded, so |
| 426 | * it can't fail at this point. |
| 427 | */ |
| 428 | mr = mdc->get_memory_region(md, &error_abort); |
| 429 | g_assert(ms->device_memory); |
| 430 | |
| 431 | ms->device_memory->used_region_size += memory_region_size(mr); |
| 432 | ms->device_memory->required_memslots += memslots; |
| 433 | if (mdc->decide_memslots && memslots > 1) { |
| 434 | ms->device_memory->memslot_auto_decision_active++; |
| 435 | } |
| 436 | |
| 437 | memory_region_add_subregion(&ms->device_memory->mr, |
| 438 | addr - ms->device_memory->base, mr); |
| 439 | trace_memory_device_plug(DEVICE(md)->id ? DEVICE(md)->id : "", addr); |
| 440 | } |
| 441 | |
| 442 | void memory_device_unplug(MemoryDeviceState *md, MachineState *ms) |
| 443 | { |
| 444 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 445 | const unsigned int memslots = memory_device_get_memslots(md); |
| 446 | MemoryRegion *mr; |
| 447 | |
| 448 | if (memory_device_is_empty(md)) { |
| 449 | return; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * We expect that a previous call to memory_device_pre_plug() succeeded, so |
| 454 | * it can't fail at this point. |
| 455 | */ |
| 456 | mr = mdc->get_memory_region(md, &error_abort); |
| 457 | g_assert(ms->device_memory); |
| 458 | |
| 459 | memory_region_del_subregion(&ms->device_memory->mr, mr); |
| 460 | |
| 461 | if (mdc->decide_memslots && memslots > 1) { |
| 462 | ms->device_memory->memslot_auto_decision_active--; |
| 463 | } |
| 464 | ms->device_memory->used_region_size -= memory_region_size(mr); |
| 465 | ms->device_memory->required_memslots -= memslots; |
| 466 | trace_memory_device_unplug(DEVICE(md)->id ? DEVICE(md)->id : "", |
| 467 | mdc->get_addr(md)); |
| 468 | } |
| 469 | |
| 470 | uint64_t memory_device_get_region_size(const MemoryDeviceState *md, |
| 471 | Error **errp) |
| 472 | { |
| 473 | const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md); |
| 474 | MemoryRegion *mr; |
| 475 | |
| 476 | /* dropping const here is fine as we don't touch the memory region */ |
| 477 | mr = mdc->get_memory_region((MemoryDeviceState *)md, errp); |
| 478 | if (!mr) { |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | return memory_region_size(mr); |
| 483 | } |
| 484 | |
| 485 | static void memory_devices_region_mod(MemoryListener *listener, |
| 486 | MemoryRegionSection *mrs, bool add) |
| 487 | { |
| 488 | DeviceMemoryState *dms = container_of(listener, DeviceMemoryState, |
| 489 | listener); |
| 490 | |
| 491 | if (!memory_region_is_ram(mrs->mr)) { |
| 492 | warn_report("Unexpected memory region mapped into device memory region."); |
| 493 | return; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * The expectation is that each distinct RAM memory region section in |
| 498 | * our region for memory devices consumes exactly one memslot in KVM |
| 499 | * and in vhost. For vhost, this is true, except: |
| 500 | * * ROM memory regions don't consume a memslot. These get used very |
| 501 | * rarely for memory devices (R/O NVDIMMs). |
| 502 | * * Memslots without a fd (memory-backend-ram) don't necessarily |
| 503 | * consume a memslot. Such setups are quite rare and possibly bogus: |
| 504 | * the memory would be inaccessible by such vhost devices. |
| 505 | * |
| 506 | * So for vhost, in corner cases we might over-estimate the number of |
| 507 | * memslots that are currently used or that might still be reserved |
| 508 | * (required - used). |
| 509 | */ |
| 510 | dms->used_memslots += add ? 1 : -1; |
| 511 | |
| 512 | if (dms->used_memslots > dms->required_memslots) { |
| 513 | warn_report("Memory devices use more memory slots than indicated as required."); |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | static void memory_devices_region_add(MemoryListener *listener, |
| 518 | MemoryRegionSection *mrs) |
| 519 | { |
| 520 | return memory_devices_region_mod(listener, mrs, true); |
| 521 | } |
| 522 | |
| 523 | static void memory_devices_region_del(MemoryListener *listener, |
| 524 | MemoryRegionSection *mrs) |
| 525 | { |
| 526 | return memory_devices_region_mod(listener, mrs, false); |
| 527 | } |
| 528 | |
| 529 | void machine_memory_devices_init(MachineState *ms, hwaddr base, uint64_t size) |
| 530 | { |
| 531 | g_assert(size); |
| 532 | g_assert(!ms->device_memory); |
| 533 | ms->device_memory = g_new0(DeviceMemoryState, 1); |
| 534 | ms->device_memory->base = base; |
| 535 | |
| 536 | memory_region_init(&ms->device_memory->mr, OBJECT(ms), "device-memory", |
| 537 | size); |
| 538 | address_space_init(&ms->device_memory->as, &ms->device_memory->mr, |
| 539 | "device-memory"); |
| 540 | memory_region_add_subregion(get_system_memory(), ms->device_memory->base, |
| 541 | &ms->device_memory->mr); |
| 542 | |
| 543 | /* Track the number of memslots used by memory devices. */ |
| 544 | ms->device_memory->listener.region_add = memory_devices_region_add; |
| 545 | ms->device_memory->listener.region_del = memory_devices_region_del; |
| 546 | memory_listener_register(&ms->device_memory->listener, |
| 547 | &ms->device_memory->as); |
| 548 | } |
| 549 | |
| 550 | static const TypeInfo memory_device_info = { |
| 551 | .name = TYPE_MEMORY_DEVICE, |
| 552 | .parent = TYPE_INTERFACE, |
| 553 | .class_size = sizeof(MemoryDeviceClass), |
| 554 | }; |
| 555 | |
| 556 | static void memory_device_register_types(void) |
| 557 | { |
| 558 | type_register_static(&memory_device_info); |
| 559 | } |
| 560 | |
| 561 | type_init(memory_device_register_types) |