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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" |
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; |
a4de8552 JH |
30 | bool discard_data; |
31 | bool is_pmem; | |
86635aa4 | 32 | bool readonly; |
52330e1a PB |
33 | }; |
34 | ||
35 | static void | |
36 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
37 | { | |
5c7ba877 IM |
38 | #ifndef CONFIG_POSIX |
39 | error_setg(errp, "backend '%s' not supported on this host", | |
40 | object_get_typename(OBJECT(backend))); | |
41 | #else | |
52330e1a | 42 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); |
9181fb70 | 43 | uint32_t ram_flags; |
fa0cb34d | 44 | gchar *name; |
52330e1a PB |
45 | |
46 | if (!backend->size) { | |
47 | error_setg(errp, "can't create backend with size 0"); | |
48 | return; | |
49 | } | |
50 | if (!fb->mem_path) { | |
c2cb2b04 | 51 | error_setg(errp, "mem-path property not set"); |
52330e1a PB |
52 | return; |
53 | } | |
314aec4a | 54 | |
fa0cb34d | 55 | name = host_memory_backend_get_name(backend); |
9181fb70 DH |
56 | ram_flags = backend->share ? RAM_SHARED : 0; |
57 | ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; | |
58 | ram_flags |= fb->is_pmem ? RAM_PMEM : 0; | |
59 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, | |
60 | backend->size, fb->align, ram_flags, | |
86635aa4 | 61 | fb->mem_path, fb->readonly, errp); |
fa0cb34d | 62 | g_free(name); |
52330e1a PB |
63 | #endif |
64 | } | |
65 | ||
52330e1a PB |
66 | static char *get_mem_path(Object *o, Error **errp) |
67 | { | |
68 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
69 | ||
70 | return g_strdup(fb->mem_path); | |
71 | } | |
72 | ||
73 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
74 | { | |
75 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
76 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
77 | ||
6f4c60e4 | 78 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
79 | error_setg(errp, "cannot change property 'mem-path' of %s", |
80 | object_get_typename(o)); | |
52330e1a PB |
81 | return; |
82 | } | |
ef1e1e07 | 83 | g_free(fb->mem_path); |
52330e1a PB |
84 | fb->mem_path = g_strdup(str); |
85 | } | |
86 | ||
11ae6ed8 EH |
87 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
88 | { | |
89 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
90 | } | |
91 | ||
92 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
93 | Error **errp) | |
94 | { | |
95 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
96 | } | |
97 | ||
98376843 HZ |
98 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
99 | const char *name, void *opaque, | |
100 | Error **errp) | |
101 | { | |
102 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
103 | uint64_t val = fb->align; | |
104 | ||
105 | visit_type_size(v, name, &val, errp); | |
106 | } | |
107 | ||
108 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
109 | const char *name, void *opaque, | |
110 | Error **errp) | |
111 | { | |
112 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
113 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
98376843 HZ |
114 | uint64_t val; |
115 | ||
116 | if (host_memory_backend_mr_inited(backend)) { | |
dcfe4805 MA |
117 | error_setg(errp, "cannot change property '%s' of %s", name, |
118 | object_get_typename(o)); | |
119 | return; | |
98376843 HZ |
120 | } |
121 | ||
668f62ec | 122 | if (!visit_type_size(v, name, &val, errp)) { |
dcfe4805 | 123 | return; |
98376843 HZ |
124 | } |
125 | fb->align = val; | |
98376843 HZ |
126 | } |
127 | ||
def835f0 | 128 | #ifdef CONFIG_LIBPMEM |
a4de8552 JH |
129 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) |
130 | { | |
131 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
132 | } | |
133 | ||
134 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
135 | { | |
136 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
137 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
138 | ||
139 | if (host_memory_backend_mr_inited(backend)) { | |
87dc3ce6 ZY |
140 | error_setg(errp, "cannot change property 'pmem' of %s.", |
141 | object_get_typename(o)); | |
a4de8552 JH |
142 | return; |
143 | } | |
144 | ||
a4de8552 JH |
145 | fb->is_pmem = value; |
146 | } | |
def835f0 | 147 | #endif /* CONFIG_LIBPMEM */ |
a4de8552 | 148 | |
86635aa4 SH |
149 | static bool file_memory_backend_get_readonly(Object *obj, Error **errp) |
150 | { | |
151 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
152 | ||
153 | return fb->readonly; | |
154 | } | |
155 | ||
156 | static void file_memory_backend_set_readonly(Object *obj, bool value, | |
157 | Error **errp) | |
158 | { | |
159 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
160 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
161 | ||
162 | if (host_memory_backend_mr_inited(backend)) { | |
163 | error_setg(errp, "cannot change property 'readonly' of %s.", | |
164 | object_get_typename(obj)); | |
165 | return; | |
166 | } | |
167 | ||
168 | fb->readonly = value; | |
169 | } | |
170 | ||
11ae6ed8 EH |
171 | static void file_backend_unparent(Object *obj) |
172 | { | |
173 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
174 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
175 | ||
176 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
177 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
178 | uint64_t sz = memory_region_size(&backend->mr); | |
179 | ||
180 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
181 | } | |
182 | } | |
183 | ||
52330e1a | 184 | static void |
026ac483 | 185 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 186 | { |
026ac483 EH |
187 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
188 | ||
189 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 190 | oc->unparent = file_backend_unparent; |
026ac483 | 191 | |
11ae6ed8 | 192 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 193 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 194 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 195 | get_mem_path, set_mem_path); |
98376843 HZ |
196 | object_class_property_add(oc, "align", "int", |
197 | file_memory_backend_get_align, | |
198 | file_memory_backend_set_align, | |
d2623129 | 199 | NULL, NULL); |
def835f0 | 200 | #ifdef CONFIG_LIBPMEM |
a4de8552 | 201 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 202 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
def835f0 | 203 | #endif |
86635aa4 SH |
204 | object_class_property_add_bool(oc, "readonly", |
205 | file_memory_backend_get_readonly, | |
206 | file_memory_backend_set_readonly); | |
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); |