2 * NUMA parameter parsing routines
4 * Copyright (c) 2014 Fujitsu Ltd.
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25 #include "sysemu/numa.h"
26 #include "exec/cpu-common.h"
27 #include "qemu/bitmap.h"
29 #include "qemu/error-report.h"
30 #include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
31 #include "qapi-visit.h"
32 #include "qapi/opts-visitor.h"
33 #include "qapi/dealloc-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"
41 QemuOptsList qemu_numa_opts = {
43 .implied_opt_name = "type",
44 .head = QTAILQ_HEAD_INITIALIZER(qemu_numa_opts.head),
45 .desc = { { 0 } } /* validated with OptsVisitor */
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
53 NodeInfo numa_info[MAX_NODES];
55 void numa_set_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node)
57 struct numa_addr_range *range;
60 * Memory-less nodes can come here with 0 size in which case,
61 * there is nothing to do.
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);
73 void numa_unset_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node)
75 struct numa_addr_range *range, *next;
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);
86 static void numa_set_mem_ranges(void)
89 ram_addr_t mem_start = 0;
92 * Deduce start address of each node and use it to store
93 * the address range info in numa_info address range list
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;
102 * Check if @addr falls under NUMA @node.
104 static bool numa_addr_belongs_to_node(ram_addr_t addr, uint32_t node)
106 struct numa_addr_range *range;
108 QLIST_FOREACH(range, &numa_info[node].addr, entry) {
109 if (addr >= range->mem_start && addr <= range->mem_end) {
117 * Given an address, return the index of the NUMA node to which the
118 * address belongs to.
120 uint32_t numa_get_node(ram_addr_t addr, Error **errp)
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)) {
131 for (i = 0; i < nb_numa_nodes; i++) {
132 if (numa_addr_belongs_to_node(addr, i)) {
137 error_setg(errp, "Address 0x" RAM_ADDR_FMT " doesn't belong to any "
142 static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
145 uint16List *cpus = NULL;
147 if (node->has_nodeid) {
148 nodenr = node->nodeid;
150 nodenr = nb_numa_nodes;
153 if (nodenr >= MAX_NODES) {
154 error_setg(errp, "Max number of NUMA nodes reached: %"
159 if (numa_info[nodenr].present) {
160 error_setg(errp, "Duplicate NUMA nodeid: %" PRIu16, nodenr);
164 for (cpus = node->cpus; cpus; cpus = cpus->next) {
165 if (cpus->value >= max_cpus) {
167 "CPU index (%" PRIu16 ")"
168 " should be smaller than maxcpus (%d)",
169 cpus->value, max_cpus);
172 bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
175 if (node->has_mem && node->has_memdev) {
176 error_setg(errp, "qemu: cannot specify both mem= and memdev=");
180 if (have_memdevs == -1) {
181 have_memdevs = node->has_memdev;
183 if (node->has_memdev != have_memdevs) {
184 error_setg(errp, "qemu: memdev option must be specified for either "
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])) {
196 numa_info[nodenr].node_mem = mem_size;
198 if (node->has_memdev) {
200 o = object_resolve_path_type(node->memdev, TYPE_MEMORY_BACKEND, NULL);
202 error_setg(errp, "memdev=%s is ambiguous", node->memdev);
207 numa_info[nodenr].node_mem = object_property_get_int(o, "size", NULL);
208 numa_info[nodenr].node_memdev = MEMORY_BACKEND(o);
210 numa_info[nodenr].present = true;
211 max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1);
214 static int parse_numa(void *opaque, QemuOpts *opts, Error **errp)
216 NumaOptions *object = NULL;
220 OptsVisitor *ov = opts_visitor_new(opts);
221 visit_type_NumaOptions(opts_get_visitor(ov), &object, NULL, &err);
222 opts_visitor_cleanup(ov);
229 switch (object->type) {
230 case NUMA_OPTIONS_KIND_NODE:
231 numa_node_parse(object->u.node, opts, &err);
244 error_report_err(err);
247 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
248 visit_type_NumaOptions(qapi_dealloc_get_visitor(dv),
249 &object, NULL, NULL);
250 qapi_dealloc_visitor_cleanup(dv);
256 static char *enumerate_cpus(unsigned long *cpus, int max_cpus)
260 GString *s = g_string_new(NULL);
262 for (cpu = find_first_bit(cpus, max_cpus);
264 cpu = find_next_bit(cpus, max_cpus, cpu + 1)) {
265 g_string_append_printf(s, "%s%d", first ? "" : " ", cpu);
268 return g_string_free(s, FALSE);
271 static void validate_numa_cpus(void)
274 DECLARE_BITMAP(seen_cpus, MAX_CPUMASK_BITS);
276 bitmap_zero(seen_cpus, MAX_CPUMASK_BITS);
277 for (i = 0; i < nb_numa_nodes; i++) {
278 if (bitmap_intersects(seen_cpus, numa_info[i].node_cpu,
280 bitmap_and(seen_cpus, seen_cpus,
281 numa_info[i].node_cpu, MAX_CPUMASK_BITS);
282 error_report("CPU(s) present in multiple NUMA nodes: %s",
283 enumerate_cpus(seen_cpus, max_cpus));
286 bitmap_or(seen_cpus, seen_cpus,
287 numa_info[i].node_cpu, MAX_CPUMASK_BITS);
290 if (!bitmap_full(seen_cpus, max_cpus)) {
292 bitmap_complement(seen_cpus, seen_cpus, max_cpus);
293 msg = enumerate_cpus(seen_cpus, max_cpus);
294 error_report("warning: CPU(s) not present in any NUMA nodes: %s", msg);
295 error_report("warning: All CPU(s) up to maxcpus should be described "
301 void parse_numa_opts(MachineClass *mc)
305 if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, NULL, NULL)) {
309 assert(max_numa_nodeid <= MAX_NODES);
311 /* No support for sparse NUMA node IDs yet: */
312 for (i = max_numa_nodeid - 1; i >= 0; i--) {
313 /* Report large node IDs first, to make mistakes easier to spot */
314 if (!numa_info[i].present) {
315 error_report("numa: Node ID missing: %d", i);
320 /* This must be always true if all nodes are present: */
321 assert(nb_numa_nodes == max_numa_nodeid);
323 if (nb_numa_nodes > 0) {
326 if (nb_numa_nodes > MAX_NODES) {
327 nb_numa_nodes = MAX_NODES;
330 /* If no memory size is given for any node, assume the default case
331 * and distribute the available memory equally across all nodes
333 for (i = 0; i < nb_numa_nodes; i++) {
334 if (numa_info[i].node_mem != 0) {
338 if (i == nb_numa_nodes) {
339 uint64_t usedmem = 0;
341 /* On Linux, each node's border has to be 8MB aligned,
342 * the final node gets the rest.
344 for (i = 0; i < nb_numa_nodes - 1; i++) {
345 numa_info[i].node_mem = (ram_size / nb_numa_nodes) &
347 usedmem += numa_info[i].node_mem;
349 numa_info[i].node_mem = ram_size - usedmem;
353 for (i = 0; i < nb_numa_nodes; i++) {
354 numa_total += numa_info[i].node_mem;
356 if (numa_total != ram_size) {
357 error_report("total memory for NUMA nodes (0x%" PRIx64 ")"
358 " should equal RAM size (0x" RAM_ADDR_FMT ")",
359 numa_total, ram_size);
363 for (i = 0; i < nb_numa_nodes; i++) {
364 QLIST_INIT(&numa_info[i].addr);
367 numa_set_mem_ranges();
369 for (i = 0; i < nb_numa_nodes; i++) {
370 if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
374 /* Historically VCPUs were assigned in round-robin order to NUMA
375 * nodes. However it causes issues with guest not handling it nice
376 * in case where cores/threads from a multicore CPU appear on
377 * different nodes. So allow boards to override default distribution
378 * rule grouping VCPUs by socket so that VCPUs from the same socket
379 * would be on the same node.
381 if (i == nb_numa_nodes) {
382 for (i = 0; i < max_cpus; i++) {
383 unsigned node_id = i % nb_numa_nodes;
384 if (mc->cpu_index_to_socket_id) {
385 node_id = mc->cpu_index_to_socket_id(i) % nb_numa_nodes;
388 set_bit(i, numa_info[node_id].node_cpu);
392 validate_numa_cpus();
394 numa_set_mem_node_id(0, ram_size, 0);
398 void numa_post_machine_init(void)
404 for (i = 0; i < nb_numa_nodes; i++) {
405 if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
412 static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
419 memory_region_init_ram_from_file(mr, owner, name, ram_size, false,
422 /* Legacy behavior: if allocation failed, fall back to
423 * regular RAM allocation.
426 error_report_err(err);
427 memory_region_init_ram(mr, owner, name, ram_size, &error_fatal);
430 fprintf(stderr, "-mem-path not supported on this host\n");
434 memory_region_init_ram(mr, owner, name, ram_size, &error_fatal);
436 vmstate_register_ram_global(mr);
439 void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
446 if (nb_numa_nodes == 0 || !have_memdevs) {
447 allocate_system_memory_nonnuma(mr, owner, name, ram_size);
451 memory_region_init(mr, owner, name, ram_size);
452 for (i = 0; i < MAX_NODES; i++) {
453 Error *local_err = NULL;
454 uint64_t size = numa_info[i].node_mem;
455 HostMemoryBackend *backend = numa_info[i].node_memdev;
459 MemoryRegion *seg = host_memory_backend_get_memory(backend, &local_err);
461 error_report_err(local_err);
465 if (memory_region_is_mapped(seg)) {
466 char *path = object_get_canonical_path_component(OBJECT(backend));
467 error_report("memory backend %s is used multiple times. Each "
468 "-numa option must use a different memdev value.",
473 memory_region_add_subregion(mr, addr, seg);
474 vmstate_register_ram_global(seg);
479 static void numa_stat_memory_devices(uint64_t node_mem[])
481 MemoryDeviceInfoList *info_list = NULL;
482 MemoryDeviceInfoList **prev = &info_list;
483 MemoryDeviceInfoList *info;
485 qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
486 for (info = info_list; info; info = info->next) {
487 MemoryDeviceInfo *value = info->value;
490 switch (value->type) {
491 case MEMORY_DEVICE_INFO_KIND_DIMM:
492 node_mem[value->u.dimm->node] += value->u.dimm->size;
499 qapi_free_MemoryDeviceInfoList(info_list);
502 void query_numa_node_mem(uint64_t node_mem[])
506 if (nb_numa_nodes <= 0) {
510 numa_stat_memory_devices(node_mem);
511 for (i = 0; i < nb_numa_nodes; i++) {
512 node_mem[i] += numa_info[i].node_mem;
516 static int query_memdev(Object *obj, void *opaque)
518 MemdevList **list = opaque;
519 MemdevList *m = NULL;
522 if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
523 m = g_malloc0(sizeof(*m));
525 m->value = g_malloc0(sizeof(*m->value));
527 m->value->size = object_property_get_int(obj, "size",
533 m->value->merge = object_property_get_bool(obj, "merge",
539 m->value->dump = object_property_get_bool(obj, "dump",
545 m->value->prealloc = object_property_get_bool(obj,
551 m->value->policy = object_property_get_enum(obj,
559 object_property_get_uint16List(obj, "host-nodes",
560 &m->value->host_nodes, &err);
577 MemdevList *qmp_query_memdev(Error **errp)
580 MemdevList *list = NULL;
582 obj = object_get_objects_root();
587 if (object_child_foreach(obj, query_memdev, &list) != 0) {
594 qapi_free_MemdevList(list);