numa.c

   1 /*
   2  * NUMA parameter parsing routines
   3  *
   4  * Copyright (c) 2014 Fujitsu Ltd.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "sysemu/numa.h"
  27 #include "exec/cpu-common.h"
  28 #include "qemu/bitmap.h"
  29 #include "qom/cpu.h"
  30 #include "qemu/error-report.h"
  31 #include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
  32 #include "qapi-visit.h"
  33 #include "qapi/opts-visitor.h"
  34 #include "hw/boards.h"
  35 #include "sysemu/hostmem.h"
  36 #include "qmp-commands.h"
  37 #include "hw/mem/pc-dimm.h"
  38 #include "qemu/option.h"
  39 #include "qemu/config-file.h"
  40
  41 QemuOptsList qemu_numa_opts = {
  42     .name = "numa",
  43     .implied_opt_name = "type",
  44     .head = QTAILQ_HEAD_INITIALIZER(qemu_numa_opts.head),
  45     .desc = { { 0 } } /* validated with OptsVisitor */
  46 };
  47
  48 static int have_memdevs = -1;
  49 static int max_numa_nodeid; /* Highest specified NUMA node ID, plus one.
  50                              * For all nodes, nodeid < max_numa_nodeid
  51                              */
  52 int nb_numa_nodes;
  53 NodeInfo numa_info[MAX_NODES];
  54
  55 void numa_set_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node)
  56 {
  57     struct numa_addr_range *range;
  58
  59     /*
  60      * Memory-less nodes can come here with 0 size in which case,
  61      * there is nothing to do.
  62      */
  63     if (!size) {
  64         return;
  65     }
  66
  67     range = g_malloc0(sizeof(*range));
  68     range->mem_start = addr;
  69     range->mem_end = addr + size - 1;
  70     QLIST_INSERT_HEAD(&numa_info[node].addr, range, entry);
  71 }
  72
  73 void numa_unset_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node)
  74 {
  75     struct numa_addr_range *range, *next;
  76
  77     QLIST_FOREACH_SAFE(range, &numa_info[node].addr, entry, next) {
  78         if (addr == range->mem_start && (addr + size - 1) == range->mem_end) {
  79             QLIST_REMOVE(range, entry);
  80             g_free(range);
  81             return;
  82         }
  83     }
  84 }
  85
  86 static void numa_set_mem_ranges(void)
  87 {
  88     int i;
  89     ram_addr_t mem_start = 0;
  90
  91     /*
  92      * Deduce start address of each node and use it to store
  93      * the address range info in numa_info address range list
  94      */
  95     for (i = 0; i < nb_numa_nodes; i++) {
  96         numa_set_mem_node_id(mem_start, numa_info[i].node_mem, i);
  97         mem_start += numa_info[i].node_mem;
  98     }
  99 }
 100
 101 /*
 102  * Check if @addr falls under NUMA @node.
 103  */
 104 static bool numa_addr_belongs_to_node(ram_addr_t addr, uint32_t node)
 105 {
 106     struct numa_addr_range *range;
 107
 108     QLIST_FOREACH(range, &numa_info[node].addr, entry) {
 109         if (addr >= range->mem_start && addr <= range->mem_end) {
 110             return true;
 111         }
 112     }
 113     return false;
 114 }
 115
 116 /*
 117  * Given an address, return the index of the NUMA node to which the
 118  * address belongs to.
 119  */
 120 uint32_t numa_get_node(ram_addr_t addr, Error **errp)
 121 {
 122     uint32_t i;
 123
 124     /* For non NUMA configurations, check if the addr falls under node 0 */
 125     if (!nb_numa_nodes) {
 126         if (numa_addr_belongs_to_node(addr, 0)) {
 127             return 0;
 128         }
 129     }
 130
 131     for (i = 0; i < nb_numa_nodes; i++) {
 132         if (numa_addr_belongs_to_node(addr, i)) {
 133             return i;
 134         }
 135     }
 136
 137     error_setg(errp, "Address 0x" RAM_ADDR_FMT " doesn't belong to any "
 138                 "NUMA node", addr);
 139     return -1;
 140 }
 141
 142 static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
 143 {
 144     uint16_t nodenr;
 145     uint16List *cpus = NULL;
 146
 147     if (node->has_nodeid) {
 148         nodenr = node->nodeid;
 149     } else {
 150         nodenr = nb_numa_nodes;
 151     }
 152
 153     if (nodenr >= MAX_NODES) {
 154         error_setg(errp, "Max number of NUMA nodes reached: %"
 155                    PRIu16 "", nodenr);
 156         return;
 157     }
 158
 159     if (numa_info[nodenr].present) {
 160         error_setg(errp, "Duplicate NUMA nodeid: %" PRIu16, nodenr);
 161         return;
 162     }
 163
 164     for (cpus = node->cpus; cpus; cpus = cpus->next) {
 165         if (cpus->value >= max_cpus) {
 166             error_setg(errp,
 167                        "CPU index (%" PRIu16 ")"
 168                        " should be smaller than maxcpus (%d)",
 169                        cpus->value, max_cpus);
 170             return;
 171         }
 172         bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
 173     }
 174
 175     if (node->has_mem && node->has_memdev) {
 176         error_setg(errp, "qemu: cannot specify both mem= and memdev=");
 177         return;
 178     }
 179
 180     if (have_memdevs == -1) {
 181         have_memdevs = node->has_memdev;
 182     }
 183     if (node->has_memdev != have_memdevs) {
 184         error_setg(errp, "qemu: memdev option must be specified for either "
 185                    "all or no nodes");
 186         return;
 187     }
 188
 189     if (node->has_mem) {
 190         uint64_t mem_size = node->mem;
 191         const char *mem_str = qemu_opt_get(opts, "mem");
 192         /* Fix up legacy suffix-less format */
 193         if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
 194             mem_size <<= 20;
 195         }
 196         numa_info[nodenr].node_mem = mem_size;
 197     }
 198     if (node->has_memdev) {
 199         Object *o;
 200         o = object_resolve_path_type(node->memdev, TYPE_MEMORY_BACKEND, NULL);
 201         if (!o) {
 202             error_setg(errp, "memdev=%s is ambiguous", node->memdev);
 203             return;
 204         }
 205
 206         object_ref(o);
 207         numa_info[nodenr].node_mem = object_property_get_int(o, "size", NULL);
 208         numa_info[nodenr].node_memdev = MEMORY_BACKEND(o);
 209     }
 210     numa_info[nodenr].present = true;
 211     max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1);
 212 }
 213
 214 static int parse_numa(void *opaque, QemuOpts *opts, Error **errp)
 215 {
 216     NumaOptions *object = NULL;
 217     Error *err = NULL;
 218
 219     {
 220         OptsVisitor *ov = opts_visitor_new(opts);
 221         visit_type_NumaOptions(opts_get_visitor(ov), NULL, &object, &err);
 222         opts_visitor_cleanup(ov);
 223     }
 224
 225     if (err) {
 226         goto error;
 227     }
 228
 229     switch (object->type) {
 230     case NUMA_OPTIONS_KIND_NODE:
 231         numa_node_parse(object->u.node, opts, &err);
 232         if (err) {
 233             goto error;
 234         }
 235         nb_numa_nodes++;
 236         break;
 237     default:
 238         abort();
 239     }
 240
 241     return 0;
 242
 243 error:
 244     error_report_err(err);
 245     qapi_free_NumaOptions(object);
 246
 247     return -1;
 248 }
 249
 250 static char *enumerate_cpus(unsigned long *cpus, int max_cpus)
 251 {
 252     int cpu;
 253     bool first = true;
 254     GString *s = g_string_new(NULL);
 255
 256     for (cpu = find_first_bit(cpus, max_cpus);
 257         cpu < max_cpus;
 258         cpu = find_next_bit(cpus, max_cpus, cpu + 1)) {
 259         g_string_append_printf(s, "%s%d", first ? "" : " ", cpu);
 260         first = false;
 261     }
 262     return g_string_free(s, FALSE);
 263 }
 264
 265 static void validate_numa_cpus(void)
 266 {
 267     int i;
 268     DECLARE_BITMAP(seen_cpus, MAX_CPUMASK_BITS);
 269
 270     bitmap_zero(seen_cpus, MAX_CPUMASK_BITS);
 271     for (i = 0; i < nb_numa_nodes; i++) {
 272         if (bitmap_intersects(seen_cpus, numa_info[i].node_cpu,
 273                               MAX_CPUMASK_BITS)) {
 274             bitmap_and(seen_cpus, seen_cpus,
 275                        numa_info[i].node_cpu, MAX_CPUMASK_BITS);
 276             error_report("CPU(s) present in multiple NUMA nodes: %s",
 277                          enumerate_cpus(seen_cpus, max_cpus));
 278             exit(EXIT_FAILURE);
 279         }
 280         bitmap_or(seen_cpus, seen_cpus,
 281                   numa_info[i].node_cpu, MAX_CPUMASK_BITS);
 282     }
 283
 284     if (!bitmap_full(seen_cpus, max_cpus)) {
 285         char *msg;
 286         bitmap_complement(seen_cpus, seen_cpus, max_cpus);
 287         msg = enumerate_cpus(seen_cpus, max_cpus);
 288         error_report("warning: CPU(s) not present in any NUMA nodes: %s", msg);
 289         error_report("warning: All CPU(s) up to maxcpus should be described "
 290                      "in NUMA config");
 291         g_free(msg);
 292     }
 293 }
 294
 295 void parse_numa_opts(MachineClass *mc)
 296 {
 297     int i;
 298
 299     if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, NULL, NULL)) {
 300         exit(1);
 301     }
 302
 303     assert(max_numa_nodeid <= MAX_NODES);
 304
 305     /* No support for sparse NUMA node IDs yet: */
 306     for (i = max_numa_nodeid - 1; i >= 0; i--) {
 307         /* Report large node IDs first, to make mistakes easier to spot */
 308         if (!numa_info[i].present) {
 309             error_report("numa: Node ID missing: %d", i);
 310             exit(1);
 311         }
 312     }
 313
 314     /* This must be always true if all nodes are present: */
 315     assert(nb_numa_nodes == max_numa_nodeid);
 316
 317     if (nb_numa_nodes > 0) {
 318         uint64_t numa_total;
 319
 320         if (nb_numa_nodes > MAX_NODES) {
 321             nb_numa_nodes = MAX_NODES;
 322         }
 323
 324         /* If no memory size is given for any node, assume the default case
 325          * and distribute the available memory equally across all nodes
 326          */
 327         for (i = 0; i < nb_numa_nodes; i++) {
 328             if (numa_info[i].node_mem != 0) {
 329                 break;
 330             }
 331         }
 332         if (i == nb_numa_nodes) {
 333             uint64_t usedmem = 0;
 334
 335             /* On Linux, each node's border has to be 8MB aligned,
 336              * the final node gets the rest.
 337              */
 338             for (i = 0; i < nb_numa_nodes - 1; i++) {
 339                 numa_info[i].node_mem = (ram_size / nb_numa_nodes) &
 340                                         ~((1 << 23UL) - 1);
 341                 usedmem += numa_info[i].node_mem;
 342             }
 343             numa_info[i].node_mem = ram_size - usedmem;
 344         }
 345
 346         numa_total = 0;
 347         for (i = 0; i < nb_numa_nodes; i++) {
 348             numa_total += numa_info[i].node_mem;
 349         }
 350         if (numa_total != ram_size) {
 351             error_report("total memory for NUMA nodes (0x%" PRIx64 ")"
 352                          " should equal RAM size (0x" RAM_ADDR_FMT ")",
 353                          numa_total, ram_size);
 354             exit(1);
 355         }
 356
 357         for (i = 0; i < nb_numa_nodes; i++) {
 358             QLIST_INIT(&numa_info[i].addr);
 359         }
 360
 361         numa_set_mem_ranges();
 362
 363         for (i = 0; i < nb_numa_nodes; i++) {
 364             if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
 365                 break;
 366             }
 367         }
 368         /* Historically VCPUs were assigned in round-robin order to NUMA
 369          * nodes. However it causes issues with guest not handling it nice
 370          * in case where cores/threads from a multicore CPU appear on
 371          * different nodes. So allow boards to override default distribution
 372          * rule grouping VCPUs by socket so that VCPUs from the same socket
 373          * would be on the same node.
 374          */
 375         if (i == nb_numa_nodes) {
 376             for (i = 0; i < max_cpus; i++) {
 377                 unsigned node_id = i % nb_numa_nodes;
 378                 if (mc->cpu_index_to_socket_id) {
 379                     node_id = mc->cpu_index_to_socket_id(i) % nb_numa_nodes;
 380                 }
 381
 382                 set_bit(i, numa_info[node_id].node_cpu);
 383             }
 384         }
 385
 386         validate_numa_cpus();
 387     } else {
 388         numa_set_mem_node_id(0, ram_size, 0);
 389     }
 390 }
 391
 392 void numa_post_machine_init(void)
 393 {
 394     CPUState *cpu;
 395     int i;
 396
 397     CPU_FOREACH(cpu) {
 398         for (i = 0; i < nb_numa_nodes; i++) {
 399             if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
 400                 cpu->numa_node = i;
 401             }
 402         }
 403     }
 404 }
 405
 406 static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
 407                                            const char *name,
 408                                            uint64_t ram_size)
 409 {
 410     if (mem_path) {
 411 #ifdef __linux__
 412         Error *err = NULL;
 413         memory_region_init_ram_from_file(mr, owner, name, ram_size, false,
 414                                          mem_path, &err);
 415         if (err) {
 416             error_report_err(err);
 417             if (mem_prealloc) {
 418                 exit(1);
 419             }
 420
 421             /* Legacy behavior: if allocation failed, fall back to
 422              * regular RAM allocation.
 423              */
 424             memory_region_init_ram(mr, owner, name, ram_size, &error_fatal);
 425         }
 426 #else
 427         fprintf(stderr, "-mem-path not supported on this host\n");
 428         exit(1);
 429 #endif
 430     } else {
 431         memory_region_init_ram(mr, owner, name, ram_size, &error_fatal);
 432     }
 433     vmstate_register_ram_global(mr);
 434 }
 435
 436 void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
 437                                           const char *name,
 438                                           uint64_t ram_size)
 439 {
 440     uint64_t addr = 0;
 441     int i;
 442
 443     if (nb_numa_nodes == 0 || !have_memdevs) {
 444         allocate_system_memory_nonnuma(mr, owner, name, ram_size);
 445         return;
 446     }
 447
 448     memory_region_init(mr, owner, name, ram_size);
 449     for (i = 0; i < MAX_NODES; i++) {
 450         uint64_t size = numa_info[i].node_mem;
 451         HostMemoryBackend *backend = numa_info[i].node_memdev;
 452         if (!backend) {
 453             continue;
 454         }
 455         MemoryRegion *seg = host_memory_backend_get_memory(backend,
 456                                                            &error_fatal);
 457
 458         if (memory_region_is_mapped(seg)) {
 459             char *path = object_get_canonical_path_component(OBJECT(backend));
 460             error_report("memory backend %s is used multiple times. Each "
 461                          "-numa option must use a different memdev value.",
 462                          path);
 463             exit(1);
 464         }
 465
 466         memory_region_add_subregion(mr, addr, seg);
 467         vmstate_register_ram_global(seg);
 468         addr += size;
 469     }
 470 }
 471
 472 static void numa_stat_memory_devices(uint64_t node_mem[])
 473 {
 474     MemoryDeviceInfoList *info_list = NULL;
 475     MemoryDeviceInfoList **prev = &info_list;
 476     MemoryDeviceInfoList *info;
 477
 478     qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
 479     for (info = info_list; info; info = info->next) {
 480         MemoryDeviceInfo *value = info->value;
 481
 482         if (value) {
 483             switch (value->type) {
 484             case MEMORY_DEVICE_INFO_KIND_DIMM:
 485                 node_mem[value->u.dimm->node] += value->u.dimm->size;
 486                 break;
 487             default:
 488                 break;
 489             }
 490         }
 491     }
 492     qapi_free_MemoryDeviceInfoList(info_list);
 493 }
 494
 495 void query_numa_node_mem(uint64_t node_mem[])
 496 {
 497     int i;
 498
 499     if (nb_numa_nodes <= 0) {
 500         return;
 501     }
 502
 503     numa_stat_memory_devices(node_mem);
 504     for (i = 0; i < nb_numa_nodes; i++) {
 505         node_mem[i] += numa_info[i].node_mem;
 506     }
 507 }
 508
 509 static int query_memdev(Object *obj, void *opaque)
 510 {
 511     MemdevList **list = opaque;
 512     MemdevList *m = NULL;
 513
 514     if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
 515         m = g_malloc0(sizeof(*m));
 516
 517         m->value = g_malloc0(sizeof(*m->value));
 518
 519         m->value->size = object_property_get_int(obj, "size",
 520                                                  &error_abort);
 521         m->value->merge = object_property_get_bool(obj, "merge",
 522                                                    &error_abort);
 523         m->value->dump = object_property_get_bool(obj, "dump",
 524                                                   &error_abort);
 525         m->value->prealloc = object_property_get_bool(obj,
 526                                                       "prealloc",
 527                                                       &error_abort);
 528         m->value->policy = object_property_get_enum(obj,
 529                                                     "policy",
 530                                                     "HostMemPolicy",
 531                                                     &error_abort);
 532         object_property_get_uint16List(obj, "host-nodes",
 533                                        &m->value->host_nodes,
 534                                        &error_abort);
 535
 536         m->next = *list;
 537         *list = m;
 538     }
 539
 540     return 0;
 541 }
 542
 543 MemdevList *qmp_query_memdev(Error **errp)
 544 {
 545     Object *obj = object_get_objects_root();
 546     MemdevList *list = NULL;
 547
 548     object_child_foreach(obj, query_memdev, &list);
 549     return list;
 550 }