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 "qapi/qmp/qerror.h"
35 #include "hw/boards.h"
36 #include "sysemu/hostmem.h"
37 #include "qmp-commands.h"
38 #include "hw/mem/pc-dimm.h"
39 #include "qemu/option.h"
40 #include "qemu/config-file.h"
42 QemuOptsList qemu_numa_opts = {
44 .implied_opt_name = "type",
45 .head = QTAILQ_HEAD_INITIALIZER(qemu_numa_opts.head),
46 .desc = { { 0 } } /* validated with OptsVisitor */
49 static int have_memdevs = -1;
50 static int max_numa_nodeid; /* Highest specified NUMA node ID, plus one.
51 * For all nodes, nodeid < max_numa_nodeid
54 NodeInfo numa_info[MAX_NODES];
56 static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
59 uint16List *cpus = NULL;
61 if (node->has_nodeid) {
62 nodenr = node->nodeid;
64 nodenr = nb_numa_nodes;
67 if (nodenr >= MAX_NODES) {
68 error_setg(errp, "Max number of NUMA nodes reached: %"
73 if (numa_info[nodenr].present) {
74 error_setg(errp, "Duplicate NUMA nodeid: %" PRIu16, nodenr);
78 for (cpus = node->cpus; cpus; cpus = cpus->next) {
79 if (cpus->value > MAX_CPUMASK_BITS) {
80 error_setg(errp, "CPU number %" PRIu16 " is bigger than %d",
81 cpus->value, MAX_CPUMASK_BITS);
84 bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
87 if (node->has_mem && node->has_memdev) {
88 error_setg(errp, "qemu: cannot specify both mem= and memdev=\n");
92 if (have_memdevs == -1) {
93 have_memdevs = node->has_memdev;
95 if (node->has_memdev != have_memdevs) {
96 error_setg(errp, "qemu: memdev option must be specified for either "
102 uint64_t mem_size = node->mem;
103 const char *mem_str = qemu_opt_get(opts, "mem");
104 /* Fix up legacy suffix-less format */
105 if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
108 numa_info[nodenr].node_mem = mem_size;
110 if (node->has_memdev) {
112 o = object_resolve_path_type(node->memdev, TYPE_MEMORY_BACKEND, NULL);
114 error_setg(errp, "memdev=%s is ambiguous", node->memdev);
119 numa_info[nodenr].node_mem = object_property_get_int(o, "size", NULL);
120 numa_info[nodenr].node_memdev = MEMORY_BACKEND(o);
122 numa_info[nodenr].present = true;
123 max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1);
126 static int parse_numa(QemuOpts *opts, void *opaque)
128 NumaOptions *object = NULL;
132 OptsVisitor *ov = opts_visitor_new(opts);
133 visit_type_NumaOptions(opts_get_visitor(ov), &object, NULL, &err);
134 opts_visitor_cleanup(ov);
141 switch (object->kind) {
142 case NUMA_OPTIONS_KIND_NODE:
143 numa_node_parse(object->node, opts, &err);
156 error_report_err(err);
159 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
160 visit_type_NumaOptions(qapi_dealloc_get_visitor(dv),
161 &object, NULL, NULL);
162 qapi_dealloc_visitor_cleanup(dv);
168 void parse_numa_opts(void)
172 if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa,
177 assert(max_numa_nodeid <= MAX_NODES);
179 /* No support for sparse NUMA node IDs yet: */
180 for (i = max_numa_nodeid - 1; i >= 0; i--) {
181 /* Report large node IDs first, to make mistakes easier to spot */
182 if (!numa_info[i].present) {
183 error_report("numa: Node ID missing: %d", i);
188 /* This must be always true if all nodes are present: */
189 assert(nb_numa_nodes == max_numa_nodeid);
191 if (nb_numa_nodes > 0) {
194 if (nb_numa_nodes > MAX_NODES) {
195 nb_numa_nodes = MAX_NODES;
198 /* If no memory size is given for any node, assume the default case
199 * and distribute the available memory equally across all nodes
201 for (i = 0; i < nb_numa_nodes; i++) {
202 if (numa_info[i].node_mem != 0) {
206 if (i == nb_numa_nodes) {
207 uint64_t usedmem = 0;
209 /* On Linux, each node's border has to be 8MB aligned,
210 * the final node gets the rest.
212 for (i = 0; i < nb_numa_nodes - 1; i++) {
213 numa_info[i].node_mem = (ram_size / nb_numa_nodes) &
215 usedmem += numa_info[i].node_mem;
217 numa_info[i].node_mem = ram_size - usedmem;
221 for (i = 0; i < nb_numa_nodes; i++) {
222 numa_total += numa_info[i].node_mem;
224 if (numa_total != ram_size) {
225 error_report("total memory for NUMA nodes (0x%" PRIx64 ")"
226 " should equal RAM size (0x" RAM_ADDR_FMT ")",
227 numa_total, ram_size);
231 for (i = 0; i < nb_numa_nodes; i++) {
232 if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
236 /* assigning the VCPUs round-robin is easier to implement, guest OSes
237 * must cope with this anyway, because there are BIOSes out there in
238 * real machines which also use this scheme.
240 if (i == nb_numa_nodes) {
241 for (i = 0; i < max_cpus; i++) {
242 set_bit(i, numa_info[i % nb_numa_nodes].node_cpu);
248 void numa_post_machine_init(void)
254 for (i = 0; i < nb_numa_nodes; i++) {
255 if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
262 static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
269 memory_region_init_ram_from_file(mr, owner, name, ram_size, false,
272 /* Legacy behavior: if allocation failed, fall back to
273 * regular RAM allocation.
276 error_report_err(err);
277 memory_region_init_ram(mr, owner, name, ram_size, &error_abort);
280 fprintf(stderr, "-mem-path not supported on this host\n");
284 memory_region_init_ram(mr, owner, name, ram_size, &error_abort);
286 vmstate_register_ram_global(mr);
289 void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
296 if (nb_numa_nodes == 0 || !have_memdevs) {
297 allocate_system_memory_nonnuma(mr, owner, name, ram_size);
301 memory_region_init(mr, owner, name, ram_size);
302 for (i = 0; i < MAX_NODES; i++) {
303 Error *local_err = NULL;
304 uint64_t size = numa_info[i].node_mem;
305 HostMemoryBackend *backend = numa_info[i].node_memdev;
309 MemoryRegion *seg = host_memory_backend_get_memory(backend, &local_err);
311 error_report_err(local_err);
315 if (memory_region_is_mapped(seg)) {
316 char *path = object_get_canonical_path_component(OBJECT(backend));
317 error_report("memory backend %s is used multiple times. Each "
318 "-numa option must use a different memdev value.",
323 memory_region_add_subregion(mr, addr, seg);
324 vmstate_register_ram_global(seg);
329 static void numa_stat_memory_devices(uint64_t node_mem[])
331 MemoryDeviceInfoList *info_list = NULL;
332 MemoryDeviceInfoList **prev = &info_list;
333 MemoryDeviceInfoList *info;
335 qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
336 for (info = info_list; info; info = info->next) {
337 MemoryDeviceInfo *value = info->value;
340 switch (value->kind) {
341 case MEMORY_DEVICE_INFO_KIND_DIMM:
342 node_mem[value->dimm->node] += value->dimm->size;
349 qapi_free_MemoryDeviceInfoList(info_list);
352 void query_numa_node_mem(uint64_t node_mem[])
356 if (nb_numa_nodes <= 0) {
360 numa_stat_memory_devices(node_mem);
361 for (i = 0; i < nb_numa_nodes; i++) {
362 node_mem[i] += numa_info[i].node_mem;
366 static int query_memdev(Object *obj, void *opaque)
368 MemdevList **list = opaque;
369 MemdevList *m = NULL;
372 if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
373 m = g_malloc0(sizeof(*m));
375 m->value = g_malloc0(sizeof(*m->value));
377 m->value->size = object_property_get_int(obj, "size",
383 m->value->merge = object_property_get_bool(obj, "merge",
389 m->value->dump = object_property_get_bool(obj, "dump",
395 m->value->prealloc = object_property_get_bool(obj,
401 m->value->policy = object_property_get_enum(obj,
403 HostMemPolicy_lookup,
409 object_property_get_uint16List(obj, "host-nodes",
410 &m->value->host_nodes, &err);
427 MemdevList *qmp_query_memdev(Error **errp)
430 MemdevList *list = NULL;
432 obj = object_resolve_path("/objects", NULL);
437 if (object_child_foreach(obj, query_memdev, &list) != 0) {
444 qapi_free_MemdevList(list);