1
2
3
4
5
6
7
8
9
10
11
12
13#include "qemu/osdep.h"
14#include "sysemu/hostmem.h"
15#include "hw/boards.h"
16#include "qapi/error.h"
17#include "qapi/qapi-builtin-visit.h"
18#include "qapi/visitor.h"
19#include "qemu/config-file.h"
20#include "qom/object_interfaces.h"
21#include "qemu/mmap-alloc.h"
22
23#ifdef CONFIG_NUMA
24#include <numaif.h>
25QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_DEFAULT != MPOL_DEFAULT);
26QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_PREFERRED != MPOL_PREFERRED);
27QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND);
28QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE);
29#endif
30
31char *
32host_memory_backend_get_name(HostMemoryBackend *backend)
33{
34 if (!backend->use_canonical_path) {
35 return object_get_canonical_path_component(OBJECT(backend));
36 }
37
38 return object_get_canonical_path(OBJECT(backend));
39}
40
41static void
42host_memory_backend_get_size(Object *obj, Visitor *v, const char *name,
43 void *opaque, Error **errp)
44{
45 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
46 uint64_t value = backend->size;
47
48 visit_type_size(v, name, &value, errp);
49}
50
51static void
52host_memory_backend_set_size(Object *obj, Visitor *v, const char *name,
53 void *opaque, Error **errp)
54{
55 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
56 Error *local_err = NULL;
57 uint64_t value;
58
59 if (host_memory_backend_mr_inited(backend)) {
60 error_setg(&local_err, "cannot change property %s of %s ",
61 name, object_get_typename(obj));
62 goto out;
63 }
64
65 visit_type_size(v, name, &value, &local_err);
66 if (local_err) {
67 goto out;
68 }
69 if (!value) {
70 error_setg(&local_err,
71 "property '%s' of %s doesn't take value '%" PRIu64 "'",
72 name, object_get_typename(obj), value);
73 goto out;
74 }
75 backend->size = value;
76out:
77 error_propagate(errp, local_err);
78}
79
80static void
81host_memory_backend_get_host_nodes(Object *obj, Visitor *v, const char *name,
82 void *opaque, Error **errp)
83{
84 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
85 uint16List *host_nodes = NULL;
86 uint16List **node = &host_nodes;
87 unsigned long value;
88
89 value = find_first_bit(backend->host_nodes, MAX_NODES);
90 if (value == MAX_NODES) {
91 goto ret;
92 }
93
94 *node = g_malloc0(sizeof(**node));
95 (*node)->value = value;
96 node = &(*node)->next;
97
98 do {
99 value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
100 if (value == MAX_NODES) {
101 break;
102 }
103
104 *node = g_malloc0(sizeof(**node));
105 (*node)->value = value;
106 node = &(*node)->next;
107 } while (true);
108
109ret:
110 visit_type_uint16List(v, name, &host_nodes, errp);
111}
112
113static void
114host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name,
115 void *opaque, Error **errp)
116{
117#ifdef CONFIG_NUMA
118 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
119 uint16List *l, *host_nodes = NULL;
120
121 visit_type_uint16List(v, name, &host_nodes, errp);
122
123 for (l = host_nodes; l; l = l->next) {
124 if (l->value >= MAX_NODES) {
125 error_setg(errp, "Invalid host-nodes value: %d", l->value);
126 goto out;
127 }
128 }
129
130 for (l = host_nodes; l; l = l->next) {
131 bitmap_set(backend->host_nodes, l->value, 1);
132 }
133
134out:
135 qapi_free_uint16List(host_nodes);
136#else
137 error_setg(errp, "NUMA node binding are not supported by this QEMU");
138#endif
139}
140
141static int
142host_memory_backend_get_policy(Object *obj, Error **errp G_GNUC_UNUSED)
143{
144 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
145 return backend->policy;
146}
147
148static void
149host_memory_backend_set_policy(Object *obj, int policy, Error **errp)
150{
151 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
152 backend->policy = policy;
153
154#ifndef CONFIG_NUMA
155 if (policy != HOST_MEM_POLICY_DEFAULT) {
156 error_setg(errp, "NUMA policies are not supported by this QEMU");
157 }
158#endif
159}
160
161static bool host_memory_backend_get_merge(Object *obj, Error **errp)
162{
163 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
164
165 return backend->merge;
166}
167
168static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
169{
170 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
171
172 if (!host_memory_backend_mr_inited(backend)) {
173 backend->merge = value;
174 return;
175 }
176
177 if (value != backend->merge) {
178 void *ptr = memory_region_get_ram_ptr(&backend->mr);
179 uint64_t sz = memory_region_size(&backend->mr);
180
181 qemu_madvise(ptr, sz,
182 value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE);
183 backend->merge = value;
184 }
185}
186
187static bool host_memory_backend_get_dump(Object *obj, Error **errp)
188{
189 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
190
191 return backend->dump;
192}
193
194static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp)
195{
196 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
197
198 if (!host_memory_backend_mr_inited(backend)) {
199 backend->dump = value;
200 return;
201 }
202
203 if (value != backend->dump) {
204 void *ptr = memory_region_get_ram_ptr(&backend->mr);
205 uint64_t sz = memory_region_size(&backend->mr);
206
207 qemu_madvise(ptr, sz,
208 value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP);
209 backend->dump = value;
210 }
211}
212
213static bool host_memory_backend_get_prealloc(Object *obj, Error **errp)
214{
215 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
216
217 return backend->prealloc || backend->force_prealloc;
218}
219
220static void host_memory_backend_set_prealloc(Object *obj, bool value,
221 Error **errp)
222{
223 Error *local_err = NULL;
224 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
225 MachineState *ms = MACHINE(qdev_get_machine());
226
227 if (backend->force_prealloc) {
228 if (value) {
229 error_setg(errp,
230 "remove -mem-prealloc to use the prealloc property");
231 return;
232 }
233 }
234
235 if (!host_memory_backend_mr_inited(backend)) {
236 backend->prealloc = value;
237 return;
238 }
239
240 if (value && !backend->prealloc) {
241 int fd = memory_region_get_fd(&backend->mr);
242 void *ptr = memory_region_get_ram_ptr(&backend->mr);
243 uint64_t sz = memory_region_size(&backend->mr);
244
245 os_mem_prealloc(fd, ptr, sz, ms->smp.cpus, &local_err);
246 if (local_err) {
247 error_propagate(errp, local_err);
248 return;
249 }
250 backend->prealloc = true;
251 }
252}
253
254static void host_memory_backend_init(Object *obj)
255{
256 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
257 MachineState *machine = MACHINE(qdev_get_machine());
258
259 backend->merge = machine_mem_merge(machine);
260 backend->dump = machine_dump_guest_core(machine);
261 backend->prealloc = mem_prealloc;
262}
263
264static void host_memory_backend_post_init(Object *obj)
265{
266 object_apply_compat_props(obj);
267}
268
269bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
270{
271
272
273
274
275 return memory_region_size(&backend->mr) != 0;
276}
277
278MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend)
279{
280 return host_memory_backend_mr_inited(backend) ? &backend->mr : NULL;
281}
282
283void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped)
284{
285 backend->is_mapped = mapped;
286}
287
288bool host_memory_backend_is_mapped(HostMemoryBackend *backend)
289{
290 return backend->is_mapped;
291}
292
293#ifdef __linux__
294size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
295{
296 Object *obj = OBJECT(memdev);
297 char *path = object_property_get_str(obj, "mem-path", NULL);
298 size_t pagesize = qemu_mempath_getpagesize(path);
299
300 g_free(path);
301 return pagesize;
302}
303#else
304size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
305{
306 return getpagesize();
307}
308#endif
309
310static void
311host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
312{
313 HostMemoryBackend *backend = MEMORY_BACKEND(uc);
314 HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
315 MachineState *ms = MACHINE(qdev_get_machine());
316 Error *local_err = NULL;
317 void *ptr;
318 uint64_t sz;
319
320 if (bc->alloc) {
321 bc->alloc(backend, &local_err);
322 if (local_err) {
323 goto out;
324 }
325
326 ptr = memory_region_get_ram_ptr(&backend->mr);
327 sz = memory_region_size(&backend->mr);
328
329 if (backend->merge) {
330 qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
331 }
332 if (!backend->dump) {
333 qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
334 }
335#ifdef CONFIG_NUMA
336 unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
337
338 unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
339
340
341
342 unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE;
343
344
345
346 if (maxnode && backend->policy == MPOL_DEFAULT) {
347 error_setg(errp, "host-nodes must be empty for policy default,"
348 " or you should explicitly specify a policy other"
349 " than default");
350 return;
351 } else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
352 error_setg(errp, "host-nodes must be set for policy %s",
353 HostMemPolicy_str(backend->policy));
354 return;
355 }
356
357
358
359
360
361
362 assert(sizeof(backend->host_nodes) >=
363 BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
364 assert(maxnode <= MAX_NODES);
365 if (mbind(ptr, sz, backend->policy,
366 maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
367 if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
368 error_setg_errno(errp, errno,
369 "cannot bind memory to host NUMA nodes");
370 return;
371 }
372 }
373#endif
374
375
376
377
378 if (backend->prealloc) {
379 os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz,
380 ms->smp.cpus, &local_err);
381 if (local_err) {
382 goto out;
383 }
384 }
385 }
386out:
387 error_propagate(errp, local_err);
388}
389
390static bool
391host_memory_backend_can_be_deleted(UserCreatable *uc)
392{
393 if (host_memory_backend_is_mapped(MEMORY_BACKEND(uc))) {
394 return false;
395 } else {
396 return true;
397 }
398}
399
400static bool host_memory_backend_get_share(Object *o, Error **errp)
401{
402 HostMemoryBackend *backend = MEMORY_BACKEND(o);
403
404 return backend->share;
405}
406
407static void host_memory_backend_set_share(Object *o, bool value, Error **errp)
408{
409 HostMemoryBackend *backend = MEMORY_BACKEND(o);
410
411 if (host_memory_backend_mr_inited(backend)) {
412 error_setg(errp, "cannot change property value");
413 return;
414 }
415 backend->share = value;
416}
417
418static bool
419host_memory_backend_get_use_canonical_path(Object *obj, Error **errp)
420{
421 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
422
423 return backend->use_canonical_path;
424}
425
426static void
427host_memory_backend_set_use_canonical_path(Object *obj, bool value,
428 Error **errp)
429{
430 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
431
432 backend->use_canonical_path = value;
433}
434
435static void
436host_memory_backend_class_init(ObjectClass *oc, void *data)
437{
438 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
439
440 ucc->complete = host_memory_backend_memory_complete;
441 ucc->can_be_deleted = host_memory_backend_can_be_deleted;
442
443 object_class_property_add_bool(oc, "merge",
444 host_memory_backend_get_merge,
445 host_memory_backend_set_merge, &error_abort);
446 object_class_property_set_description(oc, "merge",
447 "Mark memory as mergeable", &error_abort);
448 object_class_property_add_bool(oc, "dump",
449 host_memory_backend_get_dump,
450 host_memory_backend_set_dump, &error_abort);
451 object_class_property_set_description(oc, "dump",
452 "Set to 'off' to exclude from core dump", &error_abort);
453 object_class_property_add_bool(oc, "prealloc",
454 host_memory_backend_get_prealloc,
455 host_memory_backend_set_prealloc, &error_abort);
456 object_class_property_set_description(oc, "prealloc",
457 "Preallocate memory", &error_abort);
458 object_class_property_add(oc, "size", "int",
459 host_memory_backend_get_size,
460 host_memory_backend_set_size,
461 NULL, NULL, &error_abort);
462 object_class_property_set_description(oc, "size",
463 "Size of the memory region (ex: 500M)", &error_abort);
464 object_class_property_add(oc, "host-nodes", "int",
465 host_memory_backend_get_host_nodes,
466 host_memory_backend_set_host_nodes,
467 NULL, NULL, &error_abort);
468 object_class_property_set_description(oc, "host-nodes",
469 "Binds memory to the list of NUMA host nodes", &error_abort);
470 object_class_property_add_enum(oc, "policy", "HostMemPolicy",
471 &HostMemPolicy_lookup,
472 host_memory_backend_get_policy,
473 host_memory_backend_set_policy, &error_abort);
474 object_class_property_set_description(oc, "policy",
475 "Set the NUMA policy", &error_abort);
476 object_class_property_add_bool(oc, "share",
477 host_memory_backend_get_share, host_memory_backend_set_share,
478 &error_abort);
479 object_class_property_set_description(oc, "share",
480 "Mark the memory as private to QEMU or shared", &error_abort);
481 object_class_property_add_bool(oc, "x-use-canonical-path-for-ramblock-id",
482 host_memory_backend_get_use_canonical_path,
483 host_memory_backend_set_use_canonical_path, &error_abort);
484}
485
486static const TypeInfo host_memory_backend_info = {
487 .name = TYPE_MEMORY_BACKEND,
488 .parent = TYPE_OBJECT,
489 .abstract = true,
490 .class_size = sizeof(HostMemoryBackendClass),
491 .class_init = host_memory_backend_class_init,
492 .instance_size = sizeof(HostMemoryBackend),
493 .instance_init = host_memory_backend_init,
494 .instance_post_init = host_memory_backend_post_init,
495 .interfaces = (InterfaceInfo[]) {
496 { TYPE_USER_CREATABLE },
497 { }
498 }
499};
500
501static void register_types(void)
502{
503 type_register_static(&host_memory_backend_info);
504}
505
506type_init(register_types);
507