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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 | 60 | |
86100290 | 61 | backend->force_prealloc = mem_prealloc; |
fa0cb34d | 62 | name = host_memory_backend_get_name(backend); |
86100290 | 63 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), |
fa0cb34d | 64 | name, |
86100290 MAL |
65 | backend->size, fb->align, |
66 | (backend->share ? RAM_SHARED : 0) | | |
67 | (fb->is_pmem ? RAM_PMEM : 0), | |
68 | fb->mem_path, errp); | |
fa0cb34d | 69 | g_free(name); |
52330e1a PB |
70 | #endif |
71 | } | |
72 | ||
52330e1a PB |
73 | static char *get_mem_path(Object *o, Error **errp) |
74 | { | |
75 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
76 | ||
77 | return g_strdup(fb->mem_path); | |
78 | } | |
79 | ||
80 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
81 | { | |
82 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
83 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
84 | ||
6f4c60e4 | 85 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
86 | error_setg(errp, "cannot change property 'mem-path' of %s", |
87 | object_get_typename(o)); | |
52330e1a PB |
88 | return; |
89 | } | |
ef1e1e07 | 90 | g_free(fb->mem_path); |
52330e1a PB |
91 | fb->mem_path = g_strdup(str); |
92 | } | |
93 | ||
11ae6ed8 EH |
94 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
95 | { | |
96 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
97 | } | |
98 | ||
99 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
100 | Error **errp) | |
101 | { | |
102 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
103 | } | |
104 | ||
98376843 HZ |
105 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
106 | const char *name, void *opaque, | |
107 | Error **errp) | |
108 | { | |
109 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
110 | uint64_t val = fb->align; | |
111 | ||
112 | visit_type_size(v, name, &val, errp); | |
113 | } | |
114 | ||
115 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
116 | const char *name, void *opaque, | |
117 | Error **errp) | |
118 | { | |
119 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
120 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
121 | Error *local_err = NULL; | |
122 | uint64_t val; | |
123 | ||
124 | if (host_memory_backend_mr_inited(backend)) { | |
21d16836 ZY |
125 | error_setg(&local_err, "cannot change property '%s' of %s", |
126 | name, object_get_typename(o)); | |
98376843 HZ |
127 | goto out; |
128 | } | |
129 | ||
130 | visit_type_size(v, name, &val, &local_err); | |
131 | if (local_err) { | |
132 | goto out; | |
133 | } | |
134 | fb->align = val; | |
135 | ||
136 | out: | |
137 | error_propagate(errp, local_err); | |
138 | } | |
139 | ||
a4de8552 JH |
140 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) |
141 | { | |
142 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
143 | } | |
144 | ||
145 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
146 | { | |
147 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
148 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
149 | ||
150 | if (host_memory_backend_mr_inited(backend)) { | |
a1f3bb18 | 151 | |
87dc3ce6 ZY |
152 | error_setg(errp, "cannot change property 'pmem' of %s.", |
153 | object_get_typename(o)); | |
a4de8552 JH |
154 | return; |
155 | } | |
156 | ||
157 | #ifndef CONFIG_LIBPMEM | |
158 | if (value) { | |
159 | Error *local_err = NULL; | |
a1f3bb18 | 160 | |
a4de8552 JH |
161 | error_setg(&local_err, |
162 | "Lack of libpmem support while setting the 'pmem=on'" | |
87dc3ce6 ZY |
163 | " of %s. We can't ensure data persistence.", |
164 | object_get_typename(o)); | |
a4de8552 JH |
165 | error_propagate(errp, local_err); |
166 | return; | |
167 | } | |
168 | #endif | |
169 | ||
170 | fb->is_pmem = value; | |
171 | } | |
172 | ||
11ae6ed8 EH |
173 | static void file_backend_unparent(Object *obj) |
174 | { | |
175 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
176 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
177 | ||
178 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
179 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
180 | uint64_t sz = memory_region_size(&backend->mr); | |
181 | ||
182 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
183 | } | |
184 | } | |
185 | ||
52330e1a | 186 | static void |
026ac483 | 187 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 188 | { |
026ac483 EH |
189 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
190 | ||
191 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 192 | oc->unparent = file_backend_unparent; |
026ac483 | 193 | |
11ae6ed8 EH |
194 | object_class_property_add_bool(oc, "discard-data", |
195 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data, | |
196 | &error_abort); | |
026ac483 EH |
197 | object_class_property_add_str(oc, "mem-path", |
198 | get_mem_path, set_mem_path, | |
199 | &error_abort); | |
98376843 HZ |
200 | object_class_property_add(oc, "align", "int", |
201 | file_memory_backend_get_align, | |
202 | file_memory_backend_set_align, | |
203 | NULL, NULL, &error_abort); | |
a4de8552 JH |
204 | object_class_property_add_bool(oc, "pmem", |
205 | file_memory_backend_get_pmem, file_memory_backend_set_pmem, | |
206 | &error_abort); | |
52330e1a PB |
207 | } |
208 | ||
bc78a013 MAL |
209 | static void file_backend_instance_finalize(Object *o) |
210 | { | |
211 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
212 | ||
213 | g_free(fb->mem_path); | |
214 | } | |
215 | ||
52330e1a PB |
216 | static const TypeInfo file_backend_info = { |
217 | .name = TYPE_MEMORY_BACKEND_FILE, | |
218 | .parent = TYPE_MEMORY_BACKEND, | |
219 | .class_init = file_backend_class_init, | |
bc78a013 | 220 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
221 | .instance_size = sizeof(HostMemoryBackendFile), |
222 | }; | |
223 | ||
224 | static void register_types(void) | |
225 | { | |
226 | type_register_static(&file_backend_info); | |
227 | } | |
228 | ||
229 | type_init(register_types); |