| 1 | /* |
| 2 | * QEMU Host Memory Backend |
| 3 | * |
| 4 | * Copyright (C) 2013-2014 Red Hat Inc |
| 5 | * |
| 6 | * Authors: |
| 7 | * Igor Mammedov <imammedo@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "system/hostmem.h" |
| 15 | #include "system/ramblock.h" |
| 16 | #include "hw/core/boards.h" |
| 17 | #include "qapi/error.h" |
| 18 | #include "qapi/qapi-builtin-visit.h" |
| 19 | #include "qapi/visitor.h" |
| 20 | #include "qemu/config-file.h" |
| 21 | #include "qom/compat-properties.h" |
| 22 | #include "qom/object_interfaces.h" |
| 23 | #include "qemu/mmap-alloc.h" |
| 24 | #include "qemu/madvise.h" |
| 25 | #include "qemu/cutils.h" |
| 26 | #include "hw/core/qdev.h" |
| 27 | |
| 28 | #ifdef CONFIG_NUMA |
| 29 | #include <numaif.h> |
| 30 | #include <numa.h> |
| 31 | QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_DEFAULT != MPOL_DEFAULT); |
| 32 | /* |
| 33 | * HOST_MEM_POLICY_PREFERRED may either translate to MPOL_PREFERRED or |
| 34 | * MPOL_PREFERRED_MANY, see comments further below. |
| 35 | */ |
| 36 | QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_PREFERRED != MPOL_PREFERRED); |
| 37 | QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND); |
| 38 | QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE); |
| 39 | #endif |
| 40 | |
| 41 | char * |
| 42 | host_memory_backend_get_name(HostMemoryBackend *backend) |
| 43 | { |
| 44 | if (!backend->use_canonical_path) { |
| 45 | return g_strdup(object_get_canonical_path_component(OBJECT(backend))); |
| 46 | } |
| 47 | |
| 48 | return object_get_canonical_path(OBJECT(backend)); |
| 49 | } |
| 50 | |
| 51 | static void |
| 52 | host_memory_backend_get_size(Object *obj, Visitor *v, const char *name, |
| 53 | void *opaque, Error **errp) |
| 54 | { |
| 55 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 56 | uint64_t value = backend->size; |
| 57 | |
| 58 | visit_type_size(v, name, &value, errp); |
| 59 | } |
| 60 | |
| 61 | static void |
| 62 | host_memory_backend_set_size(Object *obj, Visitor *v, const char *name, |
| 63 | void *opaque, Error **errp) |
| 64 | { |
| 65 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 66 | uint64_t value; |
| 67 | |
| 68 | if (host_memory_backend_mr_inited(backend)) { |
| 69 | error_setg(errp, "cannot change property %s of %s ", name, |
| 70 | object_get_typename(obj)); |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | if (!visit_type_size(v, name, &value, errp)) { |
| 75 | return; |
| 76 | } |
| 77 | if (!value) { |
| 78 | error_setg(errp, |
| 79 | "property '%s' of %s doesn't take value '%" PRIu64 "'", |
| 80 | name, object_get_typename(obj), value); |
| 81 | return; |
| 82 | } |
| 83 | backend->size = value; |
| 84 | } |
| 85 | |
| 86 | static void |
| 87 | host_memory_backend_get_host_nodes(Object *obj, Visitor *v, const char *name, |
| 88 | void *opaque, Error **errp) |
| 89 | { |
| 90 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 91 | uint16List *host_nodes = NULL; |
| 92 | uint16List **tail = &host_nodes; |
| 93 | unsigned long value; |
| 94 | |
| 95 | value = find_first_bit(backend->host_nodes, MAX_NODES); |
| 96 | if (value == MAX_NODES) { |
| 97 | goto ret; |
| 98 | } |
| 99 | |
| 100 | QAPI_LIST_APPEND(tail, value); |
| 101 | |
| 102 | do { |
| 103 | value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1); |
| 104 | if (value == MAX_NODES) { |
| 105 | break; |
| 106 | } |
| 107 | |
| 108 | QAPI_LIST_APPEND(tail, value); |
| 109 | } while (true); |
| 110 | |
| 111 | ret: |
| 112 | visit_type_uint16List(v, name, &host_nodes, errp); |
| 113 | qapi_free_uint16List(host_nodes); |
| 114 | } |
| 115 | |
| 116 | static void |
| 117 | host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name, |
| 118 | void *opaque, Error **errp) |
| 119 | { |
| 120 | #ifdef CONFIG_NUMA |
| 121 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 122 | uint16List *l, *host_nodes = NULL; |
| 123 | |
| 124 | visit_type_uint16List(v, name, &host_nodes, errp); |
| 125 | |
| 126 | for (l = host_nodes; l; l = l->next) { |
| 127 | if (l->value >= MAX_NODES) { |
| 128 | error_setg(errp, "Invalid host-nodes value: %d", l->value); |
| 129 | goto out; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | for (l = host_nodes; l; l = l->next) { |
| 134 | bitmap_set(backend->host_nodes, l->value, 1); |
| 135 | } |
| 136 | |
| 137 | out: |
| 138 | qapi_free_uint16List(host_nodes); |
| 139 | #else |
| 140 | error_setg(errp, "NUMA node binding are not supported by this QEMU"); |
| 141 | #endif |
| 142 | } |
| 143 | |
| 144 | static int |
| 145 | host_memory_backend_get_policy(Object *obj, Error **errp G_GNUC_UNUSED) |
| 146 | { |
| 147 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 148 | return backend->policy; |
| 149 | } |
| 150 | |
| 151 | static void |
| 152 | host_memory_backend_set_policy(Object *obj, int policy, Error **errp) |
| 153 | { |
| 154 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 155 | backend->policy = policy; |
| 156 | |
| 157 | #ifndef CONFIG_NUMA |
| 158 | if (policy != HOST_MEM_POLICY_DEFAULT) { |
| 159 | error_setg(errp, "NUMA policies are not supported by this QEMU"); |
| 160 | } |
| 161 | #endif |
| 162 | } |
| 163 | |
| 164 | static bool host_memory_backend_get_merge(Object *obj, Error **errp) |
| 165 | { |
| 166 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 167 | |
| 168 | return backend->merge; |
| 169 | } |
| 170 | |
| 171 | static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp) |
| 172 | { |
| 173 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 174 | |
| 175 | if (QEMU_MADV_MERGEABLE == QEMU_MADV_INVALID) { |
| 176 | if (value) { |
| 177 | error_setg(errp, "Memory merging is not supported on this host"); |
| 178 | } |
| 179 | assert(!backend->merge); |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | if (host_memory_backend_mr_inited(backend) && |
| 184 | value != backend->merge) { |
| 185 | void *ptr = memory_region_get_ram_ptr(&backend->mr); |
| 186 | uint64_t sz = memory_region_size(&backend->mr); |
| 187 | |
| 188 | qemu_madvise(ptr, sz, |
| 189 | value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE); |
| 190 | } |
| 191 | |
| 192 | backend->merge = value; |
| 193 | } |
| 194 | |
| 195 | static bool host_memory_backend_get_dump(Object *obj, Error **errp) |
| 196 | { |
| 197 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 198 | |
| 199 | return backend->dump; |
| 200 | } |
| 201 | |
| 202 | static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp) |
| 203 | { |
| 204 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 205 | |
| 206 | if (QEMU_MADV_DONTDUMP == QEMU_MADV_INVALID) { |
| 207 | if (!value) { |
| 208 | error_setg(errp, "Dumping guest memory cannot be disabled on this host"); |
| 209 | } |
| 210 | assert(backend->dump); |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | if (host_memory_backend_mr_inited(backend) && |
| 215 | value != backend->dump) { |
| 216 | void *ptr = memory_region_get_ram_ptr(&backend->mr); |
| 217 | uint64_t sz = memory_region_size(&backend->mr); |
| 218 | |
| 219 | qemu_madvise(ptr, sz, |
| 220 | value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP); |
| 221 | } |
| 222 | |
| 223 | backend->dump = value; |
| 224 | } |
| 225 | |
| 226 | static bool host_memory_backend_get_prealloc(Object *obj, Error **errp) |
| 227 | { |
| 228 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 229 | |
| 230 | return backend->prealloc; |
| 231 | } |
| 232 | |
| 233 | static void host_memory_backend_set_prealloc(Object *obj, bool value, |
| 234 | Error **errp) |
| 235 | { |
| 236 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 237 | |
| 238 | if (!backend->reserve && value) { |
| 239 | error_setg(errp, "'prealloc=on' and 'reserve=off' are incompatible"); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | if (!host_memory_backend_mr_inited(backend)) { |
| 244 | backend->prealloc = value; |
| 245 | return; |
| 246 | } |
| 247 | |
| 248 | if (value && !backend->prealloc) { |
| 249 | int fd = memory_region_get_fd(&backend->mr); |
| 250 | void *ptr = memory_region_get_ram_ptr(&backend->mr); |
| 251 | uint64_t sz = memory_region_size(&backend->mr); |
| 252 | |
| 253 | if (!qemu_prealloc_mem(fd, ptr, sz, backend->prealloc_threads, |
| 254 | backend->prealloc_context, false, errp)) { |
| 255 | return; |
| 256 | } |
| 257 | backend->prealloc = true; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | static void host_memory_backend_get_prealloc_threads(Object *obj, Visitor *v, |
| 262 | const char *name, void *opaque, Error **errp) |
| 263 | { |
| 264 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 265 | visit_type_uint32(v, name, &backend->prealloc_threads, errp); |
| 266 | } |
| 267 | |
| 268 | static void host_memory_backend_set_prealloc_threads(Object *obj, Visitor *v, |
| 269 | const char *name, void *opaque, Error **errp) |
| 270 | { |
| 271 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 272 | uint32_t value; |
| 273 | |
| 274 | if (!visit_type_uint32(v, name, &value, errp)) { |
| 275 | return; |
| 276 | } |
| 277 | if (value <= 0) { |
| 278 | error_setg(errp, "property '%s' of %s doesn't take value '%d'", name, |
| 279 | object_get_typename(obj), value); |
| 280 | return; |
| 281 | } |
| 282 | backend->prealloc_threads = value; |
| 283 | } |
| 284 | |
| 285 | static void host_memory_backend_init(Object *obj) |
| 286 | { |
| 287 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 288 | MachineState *machine = MACHINE(qdev_get_machine()); |
| 289 | |
| 290 | /* TODO: convert access to globals to compat properties */ |
| 291 | backend->merge = machine_mem_merge(machine); |
| 292 | backend->dump = machine_dump_guest_core(machine); |
| 293 | backend->guest_memfd = machine_require_guest_memfd(machine); |
| 294 | backend->reserve = true; |
| 295 | backend->prealloc_threads = machine->smp.cpus; |
| 296 | } |
| 297 | |
| 298 | static void host_memory_backend_post_init(Object *obj) |
| 299 | { |
| 300 | object_apply_compat_props(obj); |
| 301 | } |
| 302 | |
| 303 | bool host_memory_backend_mr_inited(HostMemoryBackend *backend) |
| 304 | { |
| 305 | /* |
| 306 | * NOTE: We forbid zero-length memory backend, so here zero means |
| 307 | * "we haven't inited the backend memory region yet". |
| 308 | */ |
| 309 | return memory_region_size(&backend->mr) != 0; |
| 310 | } |
| 311 | |
| 312 | MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend) |
| 313 | { |
| 314 | return host_memory_backend_mr_inited(backend) ? &backend->mr : NULL; |
| 315 | } |
| 316 | |
| 317 | void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped) |
| 318 | { |
| 319 | backend->is_mapped = mapped; |
| 320 | } |
| 321 | |
| 322 | bool host_memory_backend_is_mapped(HostMemoryBackend *backend) |
| 323 | { |
| 324 | return backend->is_mapped; |
| 325 | } |
| 326 | |
| 327 | size_t host_memory_backend_pagesize(HostMemoryBackend *memdev) |
| 328 | { |
| 329 | size_t pagesize = qemu_ram_pagesize(memdev->mr.ram_block); |
| 330 | g_assert(pagesize >= qemu_real_host_page_size()); |
| 331 | return pagesize; |
| 332 | } |
| 333 | |
| 334 | static void |
| 335 | host_memory_backend_memory_complete(UserCreatable *uc, Error **errp) |
| 336 | { |
| 337 | HostMemoryBackend *backend = MEMORY_BACKEND(uc); |
| 338 | HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc); |
| 339 | void *ptr; |
| 340 | uint64_t sz; |
| 341 | size_t pagesize; |
| 342 | bool async = !phase_check(PHASE_LATE_BACKENDS_CREATED); |
| 343 | |
| 344 | if (!bc->alloc) { |
| 345 | return; |
| 346 | } |
| 347 | if (!bc->alloc(backend, errp)) { |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | ptr = memory_region_get_ram_ptr(&backend->mr); |
| 352 | sz = memory_region_size(&backend->mr); |
| 353 | pagesize = qemu_ram_pagesize(backend->mr.ram_block); |
| 354 | |
| 355 | if (backend->aligned && !QEMU_IS_ALIGNED(sz, pagesize)) { |
| 356 | g_autofree char *pagesize_str = size_to_str(pagesize); |
| 357 | error_setg(errp, "backend '%s' memory size must be multiple of %s", |
| 358 | object_get_typename(OBJECT(uc)), pagesize_str); |
| 359 | return; |
| 360 | } |
| 361 | |
| 362 | if (backend->merge) { |
| 363 | qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE); |
| 364 | } |
| 365 | if (!backend->dump) { |
| 366 | qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP); |
| 367 | } |
| 368 | #ifdef CONFIG_NUMA |
| 369 | unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES); |
| 370 | /* lastbit == MAX_NODES means maxnode = 0 */ |
| 371 | unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1); |
| 372 | /* |
| 373 | * Ensure policy won't be ignored in case memory is preallocated |
| 374 | * before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so |
| 375 | * this doesn't catch hugepage case. |
| 376 | */ |
| 377 | unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE; |
| 378 | int mode = backend->policy; |
| 379 | |
| 380 | /* check for invalid host-nodes and policies and give more verbose |
| 381 | * error messages than mbind(). */ |
| 382 | if (maxnode && backend->policy == MPOL_DEFAULT) { |
| 383 | error_setg(errp, "host-nodes must be empty for policy default," |
| 384 | " or you should explicitly specify a policy other" |
| 385 | " than default"); |
| 386 | return; |
| 387 | } else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) { |
| 388 | error_setg(errp, "host-nodes must be set for policy %s", |
| 389 | HostMemPolicy_str(backend->policy)); |
| 390 | return; |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * We can have up to MAX_NODES nodes, but we need to pass maxnode+1 |
| 395 | * as argument to mbind() due to an old Linux bug (feature?) which |
| 396 | * cuts off the last specified node. This means backend->host_nodes |
| 397 | * must have MAX_NODES+1 bits available. |
| 398 | */ |
| 399 | assert(sizeof(backend->host_nodes) >= |
| 400 | BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long)); |
| 401 | assert(maxnode <= MAX_NODES); |
| 402 | |
| 403 | #ifdef HAVE_NUMA_HAS_PREFERRED_MANY |
| 404 | if (mode == MPOL_PREFERRED && numa_has_preferred_many() > 0) { |
| 405 | /* |
| 406 | * Replace with MPOL_PREFERRED_MANY otherwise the mbind() below |
| 407 | * silently picks the first node. |
| 408 | */ |
| 409 | mode = MPOL_PREFERRED_MANY; |
| 410 | } |
| 411 | #endif |
| 412 | |
| 413 | if (maxnode && |
| 414 | mbind(ptr, sz, mode, backend->host_nodes, maxnode + 1, flags)) { |
| 415 | if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) { |
| 416 | error_setg_errno(errp, errno, |
| 417 | "cannot bind memory to host NUMA nodes"); |
| 418 | return; |
| 419 | } |
| 420 | } |
| 421 | #endif |
| 422 | /* |
| 423 | * Preallocate memory after the NUMA policy has been instantiated. |
| 424 | * This is necessary to guarantee memory is allocated with |
| 425 | * specified NUMA policy in place. |
| 426 | */ |
| 427 | if (backend->prealloc && !qemu_prealloc_mem(memory_region_get_fd(&backend->mr), |
| 428 | ptr, sz, |
| 429 | backend->prealloc_threads, |
| 430 | backend->prealloc_context, |
| 431 | async, errp)) { |
| 432 | return; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | static bool |
| 437 | host_memory_backend_prepare_delete(UserCreatable *uc, Error **errp) |
| 438 | { |
| 439 | if (host_memory_backend_is_mapped(MEMORY_BACKEND(uc))) { |
| 440 | error_setg(errp, |
| 441 | "Cannot delete host memory backend '%s' which is mapped", |
| 442 | object_get_canonical_path_component(OBJECT(uc))); |
| 443 | return false; |
| 444 | } else { |
| 445 | return true; |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | static bool host_memory_backend_get_share(Object *o, Error **errp) |
| 450 | { |
| 451 | HostMemoryBackend *backend = MEMORY_BACKEND(o); |
| 452 | |
| 453 | return backend->share; |
| 454 | } |
| 455 | |
| 456 | static void host_memory_backend_set_share(Object *o, bool value, Error **errp) |
| 457 | { |
| 458 | HostMemoryBackend *backend = MEMORY_BACKEND(o); |
| 459 | |
| 460 | if (host_memory_backend_mr_inited(backend)) { |
| 461 | error_setg(errp, "cannot change property value"); |
| 462 | return; |
| 463 | } |
| 464 | backend->share = value; |
| 465 | } |
| 466 | |
| 467 | #ifdef CONFIG_LINUX |
| 468 | static bool host_memory_backend_get_reserve(Object *o, Error **errp) |
| 469 | { |
| 470 | HostMemoryBackend *backend = MEMORY_BACKEND(o); |
| 471 | |
| 472 | return backend->reserve; |
| 473 | } |
| 474 | |
| 475 | static void host_memory_backend_set_reserve(Object *o, bool value, Error **errp) |
| 476 | { |
| 477 | HostMemoryBackend *backend = MEMORY_BACKEND(o); |
| 478 | |
| 479 | if (host_memory_backend_mr_inited(backend)) { |
| 480 | error_setg(errp, "cannot change property value"); |
| 481 | return; |
| 482 | } |
| 483 | if (backend->prealloc && !value) { |
| 484 | error_setg(errp, "'prealloc=on' and 'reserve=off' are incompatible"); |
| 485 | return; |
| 486 | } |
| 487 | backend->reserve = value; |
| 488 | } |
| 489 | #endif /* CONFIG_LINUX */ |
| 490 | |
| 491 | static bool |
| 492 | host_memory_backend_get_use_canonical_path(Object *obj, Error **errp) |
| 493 | { |
| 494 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 495 | |
| 496 | return backend->use_canonical_path; |
| 497 | } |
| 498 | |
| 499 | static void |
| 500 | host_memory_backend_set_use_canonical_path(Object *obj, bool value, |
| 501 | Error **errp) |
| 502 | { |
| 503 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 504 | |
| 505 | backend->use_canonical_path = value; |
| 506 | } |
| 507 | |
| 508 | static void |
| 509 | host_memory_backend_class_init(ObjectClass *oc, const void *data) |
| 510 | { |
| 511 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); |
| 512 | |
| 513 | ucc->complete = host_memory_backend_memory_complete; |
| 514 | ucc->prepare_delete = host_memory_backend_prepare_delete; |
| 515 | |
| 516 | object_class_property_add_bool(oc, "merge", |
| 517 | host_memory_backend_get_merge, |
| 518 | host_memory_backend_set_merge); |
| 519 | object_class_property_set_description(oc, "merge", |
| 520 | "Mark memory as mergeable"); |
| 521 | object_class_property_add_bool(oc, "dump", |
| 522 | host_memory_backend_get_dump, |
| 523 | host_memory_backend_set_dump); |
| 524 | object_class_property_set_description(oc, "dump", |
| 525 | "Set to 'off' to exclude from core dump"); |
| 526 | object_class_property_add_bool(oc, "prealloc", |
| 527 | host_memory_backend_get_prealloc, |
| 528 | host_memory_backend_set_prealloc); |
| 529 | object_class_property_set_description(oc, "prealloc", |
| 530 | "Preallocate memory"); |
| 531 | object_class_property_add(oc, "prealloc-threads", "int", |
| 532 | host_memory_backend_get_prealloc_threads, |
| 533 | host_memory_backend_set_prealloc_threads, |
| 534 | NULL, NULL); |
| 535 | object_class_property_set_description(oc, "prealloc-threads", |
| 536 | "Number of CPU threads to use for prealloc"); |
| 537 | object_class_property_add_link(oc, "prealloc-context", |
| 538 | TYPE_THREAD_CONTEXT, offsetof(HostMemoryBackend, prealloc_context), |
| 539 | object_property_allow_set_link, OBJ_PROP_LINK_STRONG); |
| 540 | object_class_property_set_description(oc, "prealloc-context", |
| 541 | "Context to use for creating CPU threads for preallocation"); |
| 542 | object_class_property_add(oc, "size", "int", |
| 543 | host_memory_backend_get_size, |
| 544 | host_memory_backend_set_size, |
| 545 | NULL, NULL); |
| 546 | object_class_property_set_description(oc, "size", |
| 547 | "Size of the memory region (ex: 500M)"); |
| 548 | object_class_property_add(oc, "host-nodes", "int", |
| 549 | host_memory_backend_get_host_nodes, |
| 550 | host_memory_backend_set_host_nodes, |
| 551 | NULL, NULL); |
| 552 | object_class_property_set_description(oc, "host-nodes", |
| 553 | "Binds memory to the list of NUMA host nodes"); |
| 554 | object_class_property_add_enum(oc, "policy", "HostMemPolicy", |
| 555 | &HostMemPolicy_lookup, |
| 556 | host_memory_backend_get_policy, |
| 557 | host_memory_backend_set_policy); |
| 558 | object_class_property_set_description(oc, "policy", |
| 559 | "Set the NUMA policy"); |
| 560 | object_class_property_add_bool(oc, "share", |
| 561 | host_memory_backend_get_share, host_memory_backend_set_share); |
| 562 | object_class_property_set_description(oc, "share", |
| 563 | "Mark the memory as private to QEMU or shared"); |
| 564 | #ifdef CONFIG_LINUX |
| 565 | object_class_property_add_bool(oc, "reserve", |
| 566 | host_memory_backend_get_reserve, host_memory_backend_set_reserve); |
| 567 | object_class_property_set_description(oc, "reserve", |
| 568 | "Reserve swap space (or huge pages) if applicable"); |
| 569 | #endif /* CONFIG_LINUX */ |
| 570 | /* |
| 571 | * Do not delete/rename option. This option must be considered stable |
| 572 | * (as if it didn't have the 'x-' prefix including deprecation period) as |
| 573 | * long as 4.0 and older machine types exists. |
| 574 | * Option will be used by upper layers to override (disable) canonical path |
| 575 | * for ramblock-id set by compat properties on old machine types ( <= 4.0), |
| 576 | * to keep migration working when backend is used for main RAM with |
| 577 | * -machine memory-backend= option (main RAM historically used prefix-less |
| 578 | * ramblock-id). |
| 579 | */ |
| 580 | object_class_property_add_bool(oc, "x-use-canonical-path-for-ramblock-id", |
| 581 | host_memory_backend_get_use_canonical_path, |
| 582 | host_memory_backend_set_use_canonical_path); |
| 583 | } |
| 584 | |
| 585 | static const TypeInfo host_memory_backend_info = { |
| 586 | .name = TYPE_MEMORY_BACKEND, |
| 587 | .parent = TYPE_OBJECT, |
| 588 | .abstract = true, |
| 589 | .class_size = sizeof(HostMemoryBackendClass), |
| 590 | .class_init = host_memory_backend_class_init, |
| 591 | .instance_size = sizeof(HostMemoryBackend), |
| 592 | .instance_init = host_memory_backend_init, |
| 593 | .instance_post_init = host_memory_backend_post_init, |
| 594 | .interfaces = (const InterfaceInfo[]) { |
| 595 | { TYPE_USER_CREATABLE }, |
| 596 | { } |
| 597 | } |
| 598 | }; |
| 599 | |
| 600 | static void register_types(void) |
| 601 | { |
| 602 | type_register_static(&host_memory_backend_info); |
| 603 | } |
| 604 | |
| 605 | type_init(register_types); |