memory: move mem_path handling to memory_region_allocate_system_memory
[qemu.git] / 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 "sysemu/sysemu.h"
26 #include "exec/cpu-common.h"
27 #include "qemu/bitmap.h"
28 #include "qom/cpu.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
38 QemuOptsList qemu_numa_opts = {
39 .name = "numa",
40 .implied_opt_name = "type",
41 .head = QTAILQ_HEAD_INITIALIZER(qemu_numa_opts.head),
42 .desc = { { 0 } } /* validated with OptsVisitor */
43 };
44
45 static int have_memdevs = -1;
46
47 static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
48 {
49 uint16_t nodenr;
50 uint16List *cpus = NULL;
51
52 if (node->has_nodeid) {
53 nodenr = node->nodeid;
54 } else {
55 nodenr = nb_numa_nodes;
56 }
57
58 if (nodenr >= MAX_NODES) {
59 error_setg(errp, "Max number of NUMA nodes reached: %"
60 PRIu16 "\n", nodenr);
61 return;
62 }
63
64 for (cpus = node->cpus; cpus; cpus = cpus->next) {
65 if (cpus->value > MAX_CPUMASK_BITS) {
66 error_setg(errp, "CPU number %" PRIu16 " is bigger than %d",
67 cpus->value, MAX_CPUMASK_BITS);
68 return;
69 }
70 bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
71 }
72
73 if (node->has_mem && node->has_memdev) {
74 error_setg(errp, "qemu: cannot specify both mem= and memdev=\n");
75 return;
76 }
77
78 if (have_memdevs == -1) {
79 have_memdevs = node->has_memdev;
80 }
81 if (node->has_memdev != have_memdevs) {
82 error_setg(errp, "qemu: memdev option must be specified for either "
83 "all or no nodes\n");
84 return;
85 }
86
87 if (node->has_mem) {
88 uint64_t mem_size = node->mem;
89 const char *mem_str = qemu_opt_get(opts, "mem");
90 /* Fix up legacy suffix-less format */
91 if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
92 mem_size <<= 20;
93 }
94 numa_info[nodenr].node_mem = mem_size;
95 }
96 if (node->has_memdev) {
97 Object *o;
98 o = object_resolve_path_type(node->memdev, TYPE_MEMORY_BACKEND, NULL);
99 if (!o) {
100 error_setg(errp, "memdev=%s is ambiguous", node->memdev);
101 return;
102 }
103
104 object_ref(o);
105 numa_info[nodenr].node_mem = object_property_get_int(o, "size", NULL);
106 numa_info[nodenr].node_memdev = MEMORY_BACKEND(o);
107 }
108 }
109
110 int numa_init_func(QemuOpts *opts, void *opaque)
111 {
112 NumaOptions *object = NULL;
113 Error *err = NULL;
114
115 {
116 OptsVisitor *ov = opts_visitor_new(opts);
117 visit_type_NumaOptions(opts_get_visitor(ov), &object, NULL, &err);
118 opts_visitor_cleanup(ov);
119 }
120
121 if (err) {
122 goto error;
123 }
124
125 switch (object->kind) {
126 case NUMA_OPTIONS_KIND_NODE:
127 numa_node_parse(object->node, opts, &err);
128 if (err) {
129 goto error;
130 }
131 nb_numa_nodes++;
132 break;
133 default:
134 abort();
135 }
136
137 return 0;
138
139 error:
140 qerror_report_err(err);
141 error_free(err);
142
143 if (object) {
144 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
145 visit_type_NumaOptions(qapi_dealloc_get_visitor(dv),
146 &object, NULL, NULL);
147 qapi_dealloc_visitor_cleanup(dv);
148 }
149
150 return -1;
151 }
152
153 void set_numa_nodes(void)
154 {
155 if (nb_numa_nodes > 0) {
156 uint64_t numa_total;
157 int i;
158
159 if (nb_numa_nodes > MAX_NODES) {
160 nb_numa_nodes = MAX_NODES;
161 }
162
163 /* If no memory size if given for any node, assume the default case
164 * and distribute the available memory equally across all nodes
165 */
166 for (i = 0; i < nb_numa_nodes; i++) {
167 if (numa_info[i].node_mem != 0) {
168 break;
169 }
170 }
171 if (i == nb_numa_nodes) {
172 uint64_t usedmem = 0;
173
174 /* On Linux, the each node's border has to be 8MB aligned,
175 * the final node gets the rest.
176 */
177 for (i = 0; i < nb_numa_nodes - 1; i++) {
178 numa_info[i].node_mem = (ram_size / nb_numa_nodes) &
179 ~((1 << 23UL) - 1);
180 usedmem += numa_info[i].node_mem;
181 }
182 numa_info[i].node_mem = ram_size - usedmem;
183 }
184
185 numa_total = 0;
186 for (i = 0; i < nb_numa_nodes; i++) {
187 numa_total += numa_info[i].node_mem;
188 }
189 if (numa_total != ram_size) {
190 error_report("total memory for NUMA nodes (%" PRIu64 ")"
191 " should equal RAM size (" RAM_ADDR_FMT ")",
192 numa_total, ram_size);
193 exit(1);
194 }
195
196 for (i = 0; i < nb_numa_nodes; i++) {
197 if (!bitmap_empty(numa_info[i].node_cpu, MAX_CPUMASK_BITS)) {
198 break;
199 }
200 }
201 /* assigning the VCPUs round-robin is easier to implement, guest OSes
202 * must cope with this anyway, because there are BIOSes out there in
203 * real machines which also use this scheme.
204 */
205 if (i == nb_numa_nodes) {
206 for (i = 0; i < max_cpus; i++) {
207 set_bit(i, numa_info[i % nb_numa_nodes].node_cpu);
208 }
209 }
210 }
211 }
212
213 void set_numa_modes(void)
214 {
215 CPUState *cpu;
216 int i;
217
218 CPU_FOREACH(cpu) {
219 for (i = 0; i < nb_numa_nodes; i++) {
220 if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
221 cpu->numa_node = i;
222 }
223 }
224 }
225 }
226
227 static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
228 const char *name,
229 uint64_t ram_size)
230 {
231 if (mem_path) {
232 #ifdef __linux__
233 memory_region_init_ram_from_file(mr, owner, name, ram_size, mem_path);
234 #else
235 fprintf(stderr, "-mem-path not supported on this host\n");
236 exit(1);
237 #endif
238 } else {
239 memory_region_init_ram(mr, owner, name, ram_size);
240 }
241 vmstate_register_ram_global(mr);
242 }
243
244 void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
245 const char *name,
246 uint64_t ram_size)
247 {
248 uint64_t addr = 0;
249 int i;
250
251 if (nb_numa_nodes == 0 || !have_memdevs) {
252 allocate_system_memory_nonnuma(mr, owner, name, ram_size);
253 return;
254 }
255
256 memory_region_init(mr, owner, name, ram_size);
257 for (i = 0; i < MAX_NODES; i++) {
258 Error *local_err = NULL;
259 uint64_t size = numa_info[i].node_mem;
260 HostMemoryBackend *backend = numa_info[i].node_memdev;
261 if (!backend) {
262 continue;
263 }
264 MemoryRegion *seg = host_memory_backend_get_memory(backend, &local_err);
265 if (local_err) {
266 qerror_report_err(local_err);
267 exit(1);
268 }
269
270 memory_region_add_subregion(mr, addr, seg);
271 vmstate_register_ram_global(seg);
272 addr += size;
273 }
274 }