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1 | /* | |
2 | * QEMU Host Memory Backend for hugetlbfs | |
3 | * | |
4 | * Copyright (C) 2013-2014 Red Hat Inc | |
5 | * | |
6 | * Authors: | |
7 | * Paolo Bonzini <pbonzini@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
14 | #include "qapi/error.h" | |
15 | #include "qemu/error-report.h" | |
16 | #include "qemu/module.h" | |
17 | #include "qemu/madvise.h" | |
18 | #include "sysemu/hostmem.h" | |
19 | #include "qom/object_interfaces.h" | |
20 | #include "qom/object.h" | |
21 | ||
22 | OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE) | |
23 | ||
24 | ||
25 | struct HostMemoryBackendFile { | |
26 | HostMemoryBackend parent_obj; | |
27 | ||
28 | char *mem_path; | |
29 | uint64_t align; | |
30 | uint64_t offset; | |
31 | bool discard_data; | |
32 | bool is_pmem; | |
33 | bool readonly; | |
34 | }; | |
35 | ||
36 | static void | |
37 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
38 | { | |
39 | #ifndef CONFIG_POSIX | |
40 | error_setg(errp, "backend '%s' not supported on this host", | |
41 | object_get_typename(OBJECT(backend))); | |
42 | #else | |
43 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); | |
44 | uint32_t ram_flags; | |
45 | gchar *name; | |
46 | ||
47 | if (!backend->size) { | |
48 | error_setg(errp, "can't create backend with size 0"); | |
49 | return; | |
50 | } | |
51 | if (!fb->mem_path) { | |
52 | error_setg(errp, "mem-path property not set"); | |
53 | return; | |
54 | } | |
55 | ||
56 | name = host_memory_backend_get_name(backend); | |
57 | ram_flags = backend->share ? RAM_SHARED : 0; | |
58 | ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; | |
59 | ram_flags |= fb->is_pmem ? RAM_PMEM : 0; | |
60 | ram_flags |= RAM_NAMED_FILE; | |
61 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, | |
62 | backend->size, fb->align, ram_flags, | |
63 | fb->mem_path, fb->offset, fb->readonly, | |
64 | errp); | |
65 | g_free(name); | |
66 | #endif | |
67 | } | |
68 | ||
69 | static char *get_mem_path(Object *o, Error **errp) | |
70 | { | |
71 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
72 | ||
73 | return g_strdup(fb->mem_path); | |
74 | } | |
75 | ||
76 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
77 | { | |
78 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
79 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
80 | ||
81 | if (host_memory_backend_mr_inited(backend)) { | |
82 | error_setg(errp, "cannot change property 'mem-path' of %s", | |
83 | object_get_typename(o)); | |
84 | return; | |
85 | } | |
86 | g_free(fb->mem_path); | |
87 | fb->mem_path = g_strdup(str); | |
88 | } | |
89 | ||
90 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) | |
91 | { | |
92 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
93 | } | |
94 | ||
95 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
96 | Error **errp) | |
97 | { | |
98 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
99 | } | |
100 | ||
101 | static void file_memory_backend_get_align(Object *o, Visitor *v, | |
102 | const char *name, void *opaque, | |
103 | Error **errp) | |
104 | { | |
105 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
106 | uint64_t val = fb->align; | |
107 | ||
108 | visit_type_size(v, name, &val, errp); | |
109 | } | |
110 | ||
111 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
112 | const char *name, void *opaque, | |
113 | Error **errp) | |
114 | { | |
115 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
116 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
117 | uint64_t val; | |
118 | ||
119 | if (host_memory_backend_mr_inited(backend)) { | |
120 | error_setg(errp, "cannot change property '%s' of %s", name, | |
121 | object_get_typename(o)); | |
122 | return; | |
123 | } | |
124 | ||
125 | if (!visit_type_size(v, name, &val, errp)) { | |
126 | return; | |
127 | } | |
128 | fb->align = val; | |
129 | } | |
130 | ||
131 | static void file_memory_backend_get_offset(Object *o, Visitor *v, | |
132 | const char *name, void *opaque, | |
133 | Error **errp) | |
134 | { | |
135 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
136 | uint64_t val = fb->offset; | |
137 | ||
138 | visit_type_size(v, name, &val, errp); | |
139 | } | |
140 | ||
141 | static void file_memory_backend_set_offset(Object *o, Visitor *v, | |
142 | const char *name, void *opaque, | |
143 | Error **errp) | |
144 | { | |
145 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
146 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
147 | uint64_t val; | |
148 | ||
149 | if (host_memory_backend_mr_inited(backend)) { | |
150 | error_setg(errp, "cannot change property '%s' of %s", name, | |
151 | object_get_typename(o)); | |
152 | return; | |
153 | } | |
154 | ||
155 | if (!visit_type_size(v, name, &val, errp)) { | |
156 | return; | |
157 | } | |
158 | fb->offset = val; | |
159 | } | |
160 | ||
161 | #ifdef CONFIG_LIBPMEM | |
162 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) | |
163 | { | |
164 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
165 | } | |
166 | ||
167 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
168 | { | |
169 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
170 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
171 | ||
172 | if (host_memory_backend_mr_inited(backend)) { | |
173 | error_setg(errp, "cannot change property 'pmem' of %s.", | |
174 | object_get_typename(o)); | |
175 | return; | |
176 | } | |
177 | ||
178 | fb->is_pmem = value; | |
179 | } | |
180 | #endif /* CONFIG_LIBPMEM */ | |
181 | ||
182 | static bool file_memory_backend_get_readonly(Object *obj, Error **errp) | |
183 | { | |
184 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
185 | ||
186 | return fb->readonly; | |
187 | } | |
188 | ||
189 | static void file_memory_backend_set_readonly(Object *obj, bool value, | |
190 | Error **errp) | |
191 | { | |
192 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
193 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
194 | ||
195 | if (host_memory_backend_mr_inited(backend)) { | |
196 | error_setg(errp, "cannot change property 'readonly' of %s.", | |
197 | object_get_typename(obj)); | |
198 | return; | |
199 | } | |
200 | ||
201 | fb->readonly = value; | |
202 | } | |
203 | ||
204 | static void file_backend_unparent(Object *obj) | |
205 | { | |
206 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
207 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
208 | ||
209 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
210 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
211 | uint64_t sz = memory_region_size(&backend->mr); | |
212 | ||
213 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
214 | } | |
215 | } | |
216 | ||
217 | static void | |
218 | file_backend_class_init(ObjectClass *oc, void *data) | |
219 | { | |
220 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); | |
221 | ||
222 | bc->alloc = file_backend_memory_alloc; | |
223 | oc->unparent = file_backend_unparent; | |
224 | ||
225 | object_class_property_add_bool(oc, "discard-data", | |
226 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); | |
227 | object_class_property_add_str(oc, "mem-path", | |
228 | get_mem_path, set_mem_path); | |
229 | object_class_property_add(oc, "align", "int", | |
230 | file_memory_backend_get_align, | |
231 | file_memory_backend_set_align, | |
232 | NULL, NULL); | |
233 | object_class_property_add(oc, "offset", "int", | |
234 | file_memory_backend_get_offset, | |
235 | file_memory_backend_set_offset, | |
236 | NULL, NULL); | |
237 | object_class_property_set_description(oc, "offset", | |
238 | "Offset into the target file (ex: 1G)"); | |
239 | #ifdef CONFIG_LIBPMEM | |
240 | object_class_property_add_bool(oc, "pmem", | |
241 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); | |
242 | #endif | |
243 | object_class_property_add_bool(oc, "readonly", | |
244 | file_memory_backend_get_readonly, | |
245 | file_memory_backend_set_readonly); | |
246 | } | |
247 | ||
248 | static void file_backend_instance_finalize(Object *o) | |
249 | { | |
250 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
251 | ||
252 | g_free(fb->mem_path); | |
253 | } | |
254 | ||
255 | static const TypeInfo file_backend_info = { | |
256 | .name = TYPE_MEMORY_BACKEND_FILE, | |
257 | .parent = TYPE_MEMORY_BACKEND, | |
258 | .class_init = file_backend_class_init, | |
259 | .instance_finalize = file_backend_instance_finalize, | |
260 | .instance_size = sizeof(HostMemoryBackendFile), | |
261 | }; | |
262 | ||
263 | static void register_types(void) | |
264 | { | |
265 | type_register_static(&file_backend_info); | |
266 | } | |
267 | ||
268 | type_init(register_types); |