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52330e1a PB |
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 | */ | |
0b8fa32f | 12 | |
9c058332 | 13 | #include "qemu/osdep.h" |
da34e65c | 14 | #include "qapi/error.h" |
a4de8552 | 15 | #include "qemu/error-report.h" |
0b8fa32f | 16 | #include "qemu/module.h" |
52330e1a | 17 | #include "sysemu/hostmem.h" |
a35ba7be | 18 | #include "sysemu/sysemu.h" |
52330e1a PB |
19 | #include "qom/object_interfaces.h" |
20 | ||
21 | /* hostmem-file.c */ | |
22 | /** | |
23 | * @TYPE_MEMORY_BACKEND_FILE: | |
24 | * name of backend that uses mmap on a file descriptor | |
25 | */ | |
26 | #define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" | |
27 | ||
28 | #define MEMORY_BACKEND_FILE(obj) \ | |
29 | OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE) | |
30 | ||
31 | typedef struct HostMemoryBackendFile HostMemoryBackendFile; | |
32 | ||
33 | struct HostMemoryBackendFile { | |
34 | HostMemoryBackend parent_obj; | |
dbcb8981 | 35 | |
52330e1a | 36 | char *mem_path; |
98376843 | 37 | uint64_t align; |
a4de8552 JH |
38 | bool discard_data; |
39 | bool is_pmem; | |
52330e1a PB |
40 | }; |
41 | ||
42 | static void | |
43 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
44 | { | |
5c7ba877 IM |
45 | #ifndef CONFIG_POSIX |
46 | error_setg(errp, "backend '%s' not supported on this host", | |
47 | object_get_typename(OBJECT(backend))); | |
48 | #else | |
52330e1a | 49 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); |
fa0cb34d | 50 | gchar *name; |
52330e1a PB |
51 | |
52 | if (!backend->size) { | |
53 | error_setg(errp, "can't create backend with size 0"); | |
54 | return; | |
55 | } | |
56 | if (!fb->mem_path) { | |
c2cb2b04 | 57 | error_setg(errp, "mem-path property not set"); |
52330e1a PB |
58 | return; |
59 | } | |
314aec4a SH |
60 | |
61 | /* | |
62 | * Verify pmem file size since starting a guest with an incorrect size | |
63 | * leads to confusing failures inside the guest. | |
64 | */ | |
65 | if (fb->is_pmem) { | |
66 | Error *local_err = NULL; | |
67 | uint64_t size; | |
68 | ||
69 | size = qemu_get_pmem_size(fb->mem_path, &local_err); | |
70 | if (!size) { | |
71 | error_propagate(errp, local_err); | |
72 | return; | |
73 | } | |
74 | ||
75 | if (backend->size > size) { | |
76 | error_setg(errp, "size property %" PRIu64 " is larger than " | |
77 | "pmem file \"%s\" size %" PRIu64, backend->size, | |
78 | fb->mem_path, size); | |
79 | return; | |
80 | } | |
81 | } | |
82 | ||
86100290 | 83 | backend->force_prealloc = mem_prealloc; |
fa0cb34d | 84 | name = host_memory_backend_get_name(backend); |
86100290 | 85 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), |
fa0cb34d | 86 | name, |
86100290 MAL |
87 | backend->size, fb->align, |
88 | (backend->share ? RAM_SHARED : 0) | | |
89 | (fb->is_pmem ? RAM_PMEM : 0), | |
90 | fb->mem_path, errp); | |
fa0cb34d | 91 | g_free(name); |
52330e1a PB |
92 | #endif |
93 | } | |
94 | ||
52330e1a PB |
95 | static char *get_mem_path(Object *o, Error **errp) |
96 | { | |
97 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
98 | ||
99 | return g_strdup(fb->mem_path); | |
100 | } | |
101 | ||
102 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
103 | { | |
104 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
105 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
106 | ||
6f4c60e4 | 107 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
108 | error_setg(errp, "cannot change property 'mem-path' of %s", |
109 | object_get_typename(o)); | |
52330e1a PB |
110 | return; |
111 | } | |
ef1e1e07 | 112 | g_free(fb->mem_path); |
52330e1a PB |
113 | fb->mem_path = g_strdup(str); |
114 | } | |
115 | ||
11ae6ed8 EH |
116 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
117 | { | |
118 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
119 | } | |
120 | ||
121 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
122 | Error **errp) | |
123 | { | |
124 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
125 | } | |
126 | ||
98376843 HZ |
127 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
128 | const char *name, void *opaque, | |
129 | Error **errp) | |
130 | { | |
131 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
132 | uint64_t val = fb->align; | |
133 | ||
134 | visit_type_size(v, name, &val, errp); | |
135 | } | |
136 | ||
137 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
138 | const char *name, void *opaque, | |
139 | Error **errp) | |
140 | { | |
141 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
142 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
143 | Error *local_err = NULL; | |
144 | uint64_t val; | |
145 | ||
146 | if (host_memory_backend_mr_inited(backend)) { | |
21d16836 ZY |
147 | error_setg(&local_err, "cannot change property '%s' of %s", |
148 | name, object_get_typename(o)); | |
98376843 HZ |
149 | goto out; |
150 | } | |
151 | ||
152 | visit_type_size(v, name, &val, &local_err); | |
153 | if (local_err) { | |
154 | goto out; | |
155 | } | |
156 | fb->align = val; | |
157 | ||
158 | out: | |
159 | error_propagate(errp, local_err); | |
160 | } | |
161 | ||
a4de8552 JH |
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)) { | |
a1f3bb18 | 173 | |
87dc3ce6 ZY |
174 | error_setg(errp, "cannot change property 'pmem' of %s.", |
175 | object_get_typename(o)); | |
a4de8552 JH |
176 | return; |
177 | } | |
178 | ||
179 | #ifndef CONFIG_LIBPMEM | |
180 | if (value) { | |
181 | Error *local_err = NULL; | |
a1f3bb18 | 182 | |
a4de8552 JH |
183 | error_setg(&local_err, |
184 | "Lack of libpmem support while setting the 'pmem=on'" | |
87dc3ce6 ZY |
185 | " of %s. We can't ensure data persistence.", |
186 | object_get_typename(o)); | |
a4de8552 JH |
187 | error_propagate(errp, local_err); |
188 | return; | |
189 | } | |
190 | #endif | |
191 | ||
192 | fb->is_pmem = value; | |
193 | } | |
194 | ||
11ae6ed8 EH |
195 | static void file_backend_unparent(Object *obj) |
196 | { | |
197 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
198 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
199 | ||
200 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
201 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
202 | uint64_t sz = memory_region_size(&backend->mr); | |
203 | ||
204 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
205 | } | |
206 | } | |
207 | ||
52330e1a | 208 | static void |
026ac483 | 209 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 210 | { |
026ac483 EH |
211 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
212 | ||
213 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 214 | oc->unparent = file_backend_unparent; |
026ac483 | 215 | |
11ae6ed8 EH |
216 | object_class_property_add_bool(oc, "discard-data", |
217 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data, | |
218 | &error_abort); | |
026ac483 EH |
219 | object_class_property_add_str(oc, "mem-path", |
220 | get_mem_path, set_mem_path, | |
221 | &error_abort); | |
98376843 HZ |
222 | object_class_property_add(oc, "align", "int", |
223 | file_memory_backend_get_align, | |
224 | file_memory_backend_set_align, | |
225 | NULL, NULL, &error_abort); | |
a4de8552 JH |
226 | object_class_property_add_bool(oc, "pmem", |
227 | file_memory_backend_get_pmem, file_memory_backend_set_pmem, | |
228 | &error_abort); | |
52330e1a PB |
229 | } |
230 | ||
bc78a013 MAL |
231 | static void file_backend_instance_finalize(Object *o) |
232 | { | |
233 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
234 | ||
235 | g_free(fb->mem_path); | |
236 | } | |
237 | ||
52330e1a PB |
238 | static const TypeInfo file_backend_info = { |
239 | .name = TYPE_MEMORY_BACKEND_FILE, | |
240 | .parent = TYPE_MEMORY_BACKEND, | |
241 | .class_init = file_backend_class_init, | |
bc78a013 | 242 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
243 | .instance_size = sizeof(HostMemoryBackendFile), |
244 | }; | |
245 | ||
246 | static void register_types(void) | |
247 | { | |
248 | type_register_static(&file_backend_info); | |
249 | } | |
250 | ||
251 | type_init(register_types); |