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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 | #include "qemu/osdep.h" | |
13 | #include "qapi/error.h" | |
14 | #include "qemu-common.h" | |
15 | #include "qemu/error-report.h" | |
16 | #include "sysemu/hostmem.h" | |
17 | #include "sysemu/sysemu.h" | |
18 | #include "qom/object_interfaces.h" | |
19 | ||
20 | /* hostmem-file.c */ | |
21 | /** | |
22 | * @TYPE_MEMORY_BACKEND_FILE: | |
23 | * name of backend that uses mmap on a file descriptor | |
24 | */ | |
25 | #define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" | |
26 | ||
27 | #define MEMORY_BACKEND_FILE(obj) \ | |
28 | OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE) | |
29 | ||
30 | typedef struct HostMemoryBackendFile HostMemoryBackendFile; | |
31 | ||
32 | struct HostMemoryBackendFile { | |
33 | HostMemoryBackend parent_obj; | |
34 | ||
35 | char *mem_path; | |
36 | uint64_t align; | |
37 | bool discard_data; | |
38 | bool is_pmem; | |
39 | }; | |
40 | ||
41 | static void | |
42 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
43 | { | |
44 | #ifndef CONFIG_POSIX | |
45 | error_setg(errp, "backend '%s' not supported on this host", | |
46 | object_get_typename(OBJECT(backend))); | |
47 | #else | |
48 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); | |
49 | gchar *name; | |
50 | ||
51 | if (!backend->size) { | |
52 | error_setg(errp, "can't create backend with size 0"); | |
53 | return; | |
54 | } | |
55 | if (!fb->mem_path) { | |
56 | error_setg(errp, "mem-path property not set"); | |
57 | return; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Verify pmem file size since starting a guest with an incorrect size | |
62 | * leads to confusing failures inside the guest. | |
63 | */ | |
64 | if (fb->is_pmem) { | |
65 | Error *local_err = NULL; | |
66 | uint64_t size; | |
67 | ||
68 | size = qemu_get_pmem_size(fb->mem_path, &local_err); | |
69 | if (!size) { | |
70 | error_propagate(errp, local_err); | |
71 | return; | |
72 | } | |
73 | ||
74 | if (backend->size > size) { | |
75 | error_setg(errp, "size property %" PRIu64 " is larger than " | |
76 | "pmem file \"%s\" size %" PRIu64, backend->size, | |
77 | fb->mem_path, size); | |
78 | return; | |
79 | } | |
80 | } | |
81 | ||
82 | backend->force_prealloc = mem_prealloc; | |
83 | name = host_memory_backend_get_name(backend); | |
84 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), | |
85 | name, | |
86 | backend->size, fb->align, | |
87 | (backend->share ? RAM_SHARED : 0) | | |
88 | (fb->is_pmem ? RAM_PMEM : 0), | |
89 | fb->mem_path, errp); | |
90 | g_free(name); | |
91 | #endif | |
92 | } | |
93 | ||
94 | static char *get_mem_path(Object *o, Error **errp) | |
95 | { | |
96 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
97 | ||
98 | return g_strdup(fb->mem_path); | |
99 | } | |
100 | ||
101 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
102 | { | |
103 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
104 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
105 | ||
106 | if (host_memory_backend_mr_inited(backend)) { | |
107 | error_setg(errp, "cannot change property 'mem-path' of %s", | |
108 | object_get_typename(o)); | |
109 | return; | |
110 | } | |
111 | g_free(fb->mem_path); | |
112 | fb->mem_path = g_strdup(str); | |
113 | } | |
114 | ||
115 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) | |
116 | { | |
117 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
118 | } | |
119 | ||
120 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
121 | Error **errp) | |
122 | { | |
123 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
124 | } | |
125 | ||
126 | static void file_memory_backend_get_align(Object *o, Visitor *v, | |
127 | const char *name, void *opaque, | |
128 | Error **errp) | |
129 | { | |
130 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
131 | uint64_t val = fb->align; | |
132 | ||
133 | visit_type_size(v, name, &val, errp); | |
134 | } | |
135 | ||
136 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
137 | const char *name, void *opaque, | |
138 | Error **errp) | |
139 | { | |
140 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
141 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
142 | Error *local_err = NULL; | |
143 | uint64_t val; | |
144 | ||
145 | if (host_memory_backend_mr_inited(backend)) { | |
146 | error_setg(&local_err, "cannot change property '%s' of %s", | |
147 | name, object_get_typename(o)); | |
148 | goto out; | |
149 | } | |
150 | ||
151 | visit_type_size(v, name, &val, &local_err); | |
152 | if (local_err) { | |
153 | goto out; | |
154 | } | |
155 | fb->align = val; | |
156 | ||
157 | out: | |
158 | error_propagate(errp, local_err); | |
159 | } | |
160 | ||
161 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) | |
162 | { | |
163 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
164 | } | |
165 | ||
166 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
167 | { | |
168 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
169 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
170 | ||
171 | if (host_memory_backend_mr_inited(backend)) { | |
172 | ||
173 | error_setg(errp, "cannot change property 'pmem' of %s.", | |
174 | object_get_typename(o)); | |
175 | return; | |
176 | } | |
177 | ||
178 | #ifndef CONFIG_LIBPMEM | |
179 | if (value) { | |
180 | Error *local_err = NULL; | |
181 | ||
182 | error_setg(&local_err, | |
183 | "Lack of libpmem support while setting the 'pmem=on'" | |
184 | " of %s. We can't ensure data persistence.", | |
185 | object_get_typename(o)); | |
186 | error_propagate(errp, local_err); | |
187 | return; | |
188 | } | |
189 | #endif | |
190 | ||
191 | fb->is_pmem = value; | |
192 | } | |
193 | ||
194 | static void file_backend_unparent(Object *obj) | |
195 | { | |
196 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
197 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
198 | ||
199 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
200 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
201 | uint64_t sz = memory_region_size(&backend->mr); | |
202 | ||
203 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
204 | } | |
205 | } | |
206 | ||
207 | static void | |
208 | file_backend_class_init(ObjectClass *oc, void *data) | |
209 | { | |
210 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); | |
211 | ||
212 | bc->alloc = file_backend_memory_alloc; | |
213 | oc->unparent = file_backend_unparent; | |
214 | ||
215 | object_class_property_add_bool(oc, "discard-data", | |
216 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data, | |
217 | &error_abort); | |
218 | object_class_property_add_str(oc, "mem-path", | |
219 | get_mem_path, set_mem_path, | |
220 | &error_abort); | |
221 | object_class_property_add(oc, "align", "int", | |
222 | file_memory_backend_get_align, | |
223 | file_memory_backend_set_align, | |
224 | NULL, NULL, &error_abort); | |
225 | object_class_property_add_bool(oc, "pmem", | |
226 | file_memory_backend_get_pmem, file_memory_backend_set_pmem, | |
227 | &error_abort); | |
228 | } | |
229 | ||
230 | static void file_backend_instance_finalize(Object *o) | |
231 | { | |
232 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
233 | ||
234 | g_free(fb->mem_path); | |
235 | } | |
236 | ||
237 | static const TypeInfo file_backend_info = { | |
238 | .name = TYPE_MEMORY_BACKEND_FILE, | |
239 | .parent = TYPE_MEMORY_BACKEND, | |
240 | .class_init = file_backend_class_init, | |
241 | .instance_finalize = file_backend_instance_finalize, | |
242 | .instance_size = sizeof(HostMemoryBackendFile), | |
243 | }; | |
244 | ||
245 | static void register_types(void) | |
246 | { | |
247 | type_register_static(&file_backend_info); | |
248 | } | |
249 | ||
250 | type_init(register_types); |