]>
Commit | Line | Data |
---|---|---|
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" |
b85ea5fa | 17 | #include "qemu/madvise.h" |
52330e1a PB |
18 | #include "sysemu/hostmem.h" |
19 | #include "qom/object_interfaces.h" | |
db1015e9 | 20 | #include "qom/object.h" |
52330e1a | 21 | |
8063396b | 22 | OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE) |
52330e1a | 23 | |
52330e1a PB |
24 | |
25 | struct HostMemoryBackendFile { | |
26 | HostMemoryBackend parent_obj; | |
dbcb8981 | 27 | |
52330e1a | 28 | char *mem_path; |
98376843 | 29 | uint64_t align; |
4b870dc4 | 30 | uint64_t offset; |
a4de8552 JH |
31 | bool discard_data; |
32 | bool is_pmem; | |
86635aa4 | 33 | bool readonly; |
52330e1a PB |
34 | }; |
35 | ||
36 | static void | |
37 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
38 | { | |
5c7ba877 IM |
39 | #ifndef CONFIG_POSIX |
40 | error_setg(errp, "backend '%s' not supported on this host", | |
41 | object_get_typename(OBJECT(backend))); | |
42 | #else | |
52330e1a | 43 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); |
9181fb70 | 44 | uint32_t ram_flags; |
fa0cb34d | 45 | gchar *name; |
52330e1a PB |
46 | |
47 | if (!backend->size) { | |
48 | error_setg(errp, "can't create backend with size 0"); | |
49 | return; | |
50 | } | |
51 | if (!fb->mem_path) { | |
c2cb2b04 | 52 | error_setg(errp, "mem-path property not set"); |
52330e1a PB |
53 | return; |
54 | } | |
314aec4a | 55 | |
fa0cb34d | 56 | name = host_memory_backend_get_name(backend); |
9181fb70 DH |
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 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, | |
61 | backend->size, fb->align, ram_flags, | |
4b870dc4 AG |
62 | fb->mem_path, fb->offset, fb->readonly, |
63 | errp); | |
fa0cb34d | 64 | g_free(name); |
52330e1a PB |
65 | #endif |
66 | } | |
67 | ||
52330e1a PB |
68 | static char *get_mem_path(Object *o, Error **errp) |
69 | { | |
70 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
71 | ||
72 | return g_strdup(fb->mem_path); | |
73 | } | |
74 | ||
75 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
76 | { | |
77 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
78 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
79 | ||
6f4c60e4 | 80 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
81 | error_setg(errp, "cannot change property 'mem-path' of %s", |
82 | object_get_typename(o)); | |
52330e1a PB |
83 | return; |
84 | } | |
ef1e1e07 | 85 | g_free(fb->mem_path); |
52330e1a PB |
86 | fb->mem_path = g_strdup(str); |
87 | } | |
88 | ||
11ae6ed8 EH |
89 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
90 | { | |
91 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
92 | } | |
93 | ||
94 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
95 | Error **errp) | |
96 | { | |
97 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
98 | } | |
99 | ||
98376843 HZ |
100 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
101 | const char *name, void *opaque, | |
102 | Error **errp) | |
103 | { | |
104 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
105 | uint64_t val = fb->align; | |
106 | ||
107 | visit_type_size(v, name, &val, errp); | |
108 | } | |
109 | ||
110 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
111 | const char *name, void *opaque, | |
112 | Error **errp) | |
113 | { | |
114 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
115 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
98376843 HZ |
116 | uint64_t val; |
117 | ||
118 | if (host_memory_backend_mr_inited(backend)) { | |
dcfe4805 MA |
119 | error_setg(errp, "cannot change property '%s' of %s", name, |
120 | object_get_typename(o)); | |
121 | return; | |
98376843 HZ |
122 | } |
123 | ||
668f62ec | 124 | if (!visit_type_size(v, name, &val, errp)) { |
dcfe4805 | 125 | return; |
98376843 HZ |
126 | } |
127 | fb->align = val; | |
98376843 HZ |
128 | } |
129 | ||
4b870dc4 AG |
130 | static void file_memory_backend_get_offset(Object *o, Visitor *v, |
131 | const char *name, void *opaque, | |
132 | Error **errp) | |
133 | { | |
134 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
135 | uint64_t val = fb->offset; | |
136 | ||
137 | visit_type_size(v, name, &val, errp); | |
138 | } | |
139 | ||
140 | static void file_memory_backend_set_offset(Object *o, Visitor *v, | |
141 | const char *name, void *opaque, | |
142 | Error **errp) | |
143 | { | |
144 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
145 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
146 | uint64_t val; | |
147 | ||
148 | if (host_memory_backend_mr_inited(backend)) { | |
149 | error_setg(errp, "cannot change property '%s' of %s", name, | |
150 | object_get_typename(o)); | |
151 | return; | |
152 | } | |
153 | ||
154 | if (!visit_type_size(v, name, &val, errp)) { | |
155 | return; | |
156 | } | |
157 | fb->offset = val; | |
158 | } | |
159 | ||
def835f0 | 160 | #ifdef CONFIG_LIBPMEM |
a4de8552 JH |
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)) { | |
87dc3ce6 ZY |
172 | error_setg(errp, "cannot change property 'pmem' of %s.", |
173 | object_get_typename(o)); | |
a4de8552 JH |
174 | return; |
175 | } | |
176 | ||
a4de8552 JH |
177 | fb->is_pmem = value; |
178 | } | |
def835f0 | 179 | #endif /* CONFIG_LIBPMEM */ |
a4de8552 | 180 | |
86635aa4 SH |
181 | static bool file_memory_backend_get_readonly(Object *obj, Error **errp) |
182 | { | |
183 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
184 | ||
185 | return fb->readonly; | |
186 | } | |
187 | ||
188 | static void file_memory_backend_set_readonly(Object *obj, bool value, | |
189 | Error **errp) | |
190 | { | |
191 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
192 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
193 | ||
194 | if (host_memory_backend_mr_inited(backend)) { | |
195 | error_setg(errp, "cannot change property 'readonly' of %s.", | |
196 | object_get_typename(obj)); | |
197 | return; | |
198 | } | |
199 | ||
200 | fb->readonly = value; | |
201 | } | |
202 | ||
11ae6ed8 EH |
203 | static void file_backend_unparent(Object *obj) |
204 | { | |
205 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
206 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
207 | ||
208 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
209 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
210 | uint64_t sz = memory_region_size(&backend->mr); | |
211 | ||
212 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
213 | } | |
214 | } | |
215 | ||
52330e1a | 216 | static void |
026ac483 | 217 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 218 | { |
026ac483 EH |
219 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
220 | ||
221 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 222 | oc->unparent = file_backend_unparent; |
026ac483 | 223 | |
11ae6ed8 | 224 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 225 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 226 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 227 | get_mem_path, set_mem_path); |
98376843 HZ |
228 | object_class_property_add(oc, "align", "int", |
229 | file_memory_backend_get_align, | |
230 | file_memory_backend_set_align, | |
d2623129 | 231 | NULL, NULL); |
4b870dc4 AG |
232 | object_class_property_add(oc, "offset", "int", |
233 | file_memory_backend_get_offset, | |
234 | file_memory_backend_set_offset, | |
235 | NULL, NULL); | |
236 | object_class_property_set_description(oc, "offset", | |
237 | "Offset into the target file (ex: 1G)"); | |
def835f0 | 238 | #ifdef CONFIG_LIBPMEM |
a4de8552 | 239 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 240 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
def835f0 | 241 | #endif |
86635aa4 SH |
242 | object_class_property_add_bool(oc, "readonly", |
243 | file_memory_backend_get_readonly, | |
244 | file_memory_backend_set_readonly); | |
52330e1a PB |
245 | } |
246 | ||
bc78a013 MAL |
247 | static void file_backend_instance_finalize(Object *o) |
248 | { | |
249 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
250 | ||
251 | g_free(fb->mem_path); | |
252 | } | |
253 | ||
52330e1a PB |
254 | static const TypeInfo file_backend_info = { |
255 | .name = TYPE_MEMORY_BACKEND_FILE, | |
256 | .parent = TYPE_MEMORY_BACKEND, | |
257 | .class_init = file_backend_class_init, | |
bc78a013 | 258 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
259 | .instance_size = sizeof(HostMemoryBackendFile), |
260 | }; | |
261 | ||
262 | static void register_types(void) | |
263 | { | |
264 | type_register_static(&file_backend_info); | |
265 | } | |
266 | ||
267 | type_init(register_types); |