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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
226 if (backend->force_prealloc) {
227 if (value) {
228 error_setg(errp,
229 "remove -mem-prealloc to use the prealloc property");
230 return;
231 }
232 }
233
234 if (!host_memory_backend_mr_inited(backend)) {
235 backend->prealloc = value;
236 return;
237 }
238
239 if (value && !backend->prealloc) {
240 int fd = memory_region_get_fd(&backend->mr);
241 void *ptr = memory_region_get_ram_ptr(&backend->mr);
242 uint64_t sz = memory_region_size(&backend->mr);
243
244 os_mem_prealloc(fd, ptr, sz, smp_cpus, &local_err);
245 if (local_err) {
246 error_propagate(errp, local_err);
247 return;
248 }
249 backend->prealloc = true;
250 }
251}
252
253static void host_memory_backend_init(Object *obj)
254{
255 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
256 MachineState *machine = MACHINE(qdev_get_machine());
257
258 backend->merge = machine_mem_merge(machine);
259 backend->dump = machine_dump_guest_core(machine);
260 backend->prealloc = mem_prealloc;
261}
262
263static void host_memory_backend_post_init(Object *obj)
264{
265 object_apply_compat_props(obj);
266}
267
268bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
269{
270
271
272
273
274 return memory_region_size(&backend->mr) != 0;
275}
276
277MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend)
278{
279 return host_memory_backend_mr_inited(backend) ? &backend->mr : NULL;
280}
281
282void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped)
283{
284 backend->is_mapped = mapped;
285}
286
287bool host_memory_backend_is_mapped(HostMemoryBackend *backend)
288{
289 return backend->is_mapped;
290}
291
292#ifdef __linux__
293size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
294{
295 Object *obj = OBJECT(memdev);
296 char *path = object_property_get_str(obj, "mem-path", NULL);
297 size_t pagesize = qemu_mempath_getpagesize(path);
298
299 g_free(path);
300 return pagesize;
301}
302#else
303size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
304{
305 return getpagesize();
306}
307#endif
308
309static void
310host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
311{
312 HostMemoryBackend *backend = MEMORY_BACKEND(uc);
313 HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
314 Error *local_err = NULL;
315 void *ptr;
316 uint64_t sz;
317
318 if (bc->alloc) {
319 bc->alloc(backend, &local_err);
320 if (local_err) {
321 goto out;
322 }
323
324 ptr = memory_region_get_ram_ptr(&backend->mr);
325 sz = memory_region_size(&backend->mr);
326
327 if (backend->merge) {
328 qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
329 }
330 if (!backend->dump) {
331 qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
332 }
333#ifdef CONFIG_NUMA
334 unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
335
336 unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
337
338
339
340 unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE;
341
342
343
344 if (maxnode && backend->policy == MPOL_DEFAULT) {
345 error_setg(errp, "host-nodes must be empty for policy default,"
346 " or you should explicitly specify a policy other"
347 " than default");
348 return;
349 } else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
350 error_setg(errp, "host-nodes must be set for policy %s",
351 HostMemPolicy_str(backend->policy));
352 return;
353 }
354
355
356
357
358
359
360 assert(sizeof(backend->host_nodes) >=
361 BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
362 assert(maxnode <= MAX_NODES);
363 if (mbind(ptr, sz, backend->policy,
364 maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
365 if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
366 error_setg_errno(errp, errno,
367 "cannot bind memory to host NUMA nodes");
368 return;
369 }
370 }
371#endif
372
373
374
375
376 if (backend->prealloc) {
377 os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz,
378 smp_cpus, &local_err);
379 if (local_err) {
380 goto out;
381 }
382 }
383 }
384out:
385 error_propagate(errp, local_err);
386}
387
388static bool
389host_memory_backend_can_be_deleted(UserCreatable *uc)
390{
391 if (host_memory_backend_is_mapped(MEMORY_BACKEND(uc))) {
392 return false;
393 } else {
394 return true;
395 }
396}
397
398static bool host_memory_backend_get_share(Object *o, Error **errp)
399{
400 HostMemoryBackend *backend = MEMORY_BACKEND(o);
401
402 return backend->share;
403}
404
405static void host_memory_backend_set_share(Object *o, bool value, Error **errp)
406{
407 HostMemoryBackend *backend = MEMORY_BACKEND(o);
408
409 if (host_memory_backend_mr_inited(backend)) {
410 error_setg(errp, "cannot change property value");
411 return;
412 }
413 backend->share = value;
414}
415
416static bool
417host_memory_backend_get_use_canonical_path(Object *obj, Error **errp)
418{
419 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
420
421 return backend->use_canonical_path;
422}
423
424static void
425host_memory_backend_set_use_canonical_path(Object *obj, bool value,
426 Error **errp)
427{
428 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
429
430 backend->use_canonical_path = value;
431}
432
433static void
434host_memory_backend_class_init(ObjectClass *oc, void *data)
435{
436 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
437
438 ucc->complete = host_memory_backend_memory_complete;
439 ucc->can_be_deleted = host_memory_backend_can_be_deleted;
440
441 object_class_property_add_bool(oc, "merge",
442 host_memory_backend_get_merge,
443 host_memory_backend_set_merge, &error_abort);
444 object_class_property_set_description(oc, "merge",
445 "Mark memory as mergeable", &error_abort);
446 object_class_property_add_bool(oc, "dump",
447 host_memory_backend_get_dump,
448 host_memory_backend_set_dump, &error_abort);
449 object_class_property_set_description(oc, "dump",
450 "Set to 'off' to exclude from core dump", &error_abort);
451 object_class_property_add_bool(oc, "prealloc",
452 host_memory_backend_get_prealloc,
453 host_memory_backend_set_prealloc, &error_abort);
454 object_class_property_set_description(oc, "prealloc",
455 "Preallocate memory", &error_abort);
456 object_class_property_add(oc, "size", "int",
457 host_memory_backend_get_size,
458 host_memory_backend_set_size,
459 NULL, NULL, &error_abort);
460 object_class_property_set_description(oc, "size",
461 "Size of the memory region (ex: 500M)", &error_abort);
462 object_class_property_add(oc, "host-nodes", "int",
463 host_memory_backend_get_host_nodes,
464 host_memory_backend_set_host_nodes,
465 NULL, NULL, &error_abort);
466 object_class_property_set_description(oc, "host-nodes",
467 "Binds memory to the list of NUMA host nodes", &error_abort);
468 object_class_property_add_enum(oc, "policy", "HostMemPolicy",
469 &HostMemPolicy_lookup,
470 host_memory_backend_get_policy,
471 host_memory_backend_set_policy, &error_abort);
472 object_class_property_set_description(oc, "policy",
473 "Set the NUMA policy", &error_abort);
474 object_class_property_add_bool(oc, "share",
475 host_memory_backend_get_share, host_memory_backend_set_share,
476 &error_abort);
477 object_class_property_set_description(oc, "share",
478 "Mark the memory as private to QEMU or shared", &error_abort);
479 object_class_property_add_bool(oc, "x-use-canonical-path-for-ramblock-id",
480 host_memory_backend_get_use_canonical_path,
481 host_memory_backend_set_use_canonical_path, &error_abort);
482}
483
484static const TypeInfo host_memory_backend_info = {
485 .name = TYPE_MEMORY_BACKEND,
486 .parent = TYPE_OBJECT,
487 .abstract = true,
488 .class_size = sizeof(HostMemoryBackendClass),
489 .class_init = host_memory_backend_class_init,
490 .instance_size = sizeof(HostMemoryBackend),
491 .instance_init = host_memory_backend_init,
492 .instance_post_init = host_memory_backend_post_init,
493 .interfaces = (InterfaceInfo[]) {
494 { TYPE_USER_CREATABLE },
495 { }
496 }
497};
498
499static void register_types(void)
500{
501 type_register_static(&host_memory_backend_info);
502}
503
504type_init(register_types);
505