]>
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" |
52330e1a PB |
17 | #include "sysemu/hostmem.h" |
18 | #include "qom/object_interfaces.h" | |
db1015e9 | 19 | #include "qom/object.h" |
52330e1a | 20 | |
8063396b | 21 | OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE) |
52330e1a | 22 | |
52330e1a PB |
23 | |
24 | struct HostMemoryBackendFile { | |
25 | HostMemoryBackend parent_obj; | |
dbcb8981 | 26 | |
52330e1a | 27 | char *mem_path; |
98376843 | 28 | uint64_t align; |
a4de8552 JH |
29 | bool discard_data; |
30 | bool is_pmem; | |
86635aa4 | 31 | bool readonly; |
52330e1a PB |
32 | }; |
33 | ||
34 | static void | |
35 | file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
36 | { | |
5c7ba877 IM |
37 | #ifndef CONFIG_POSIX |
38 | error_setg(errp, "backend '%s' not supported on this host", | |
39 | object_get_typename(OBJECT(backend))); | |
40 | #else | |
52330e1a | 41 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); |
9181fb70 | 42 | uint32_t ram_flags; |
fa0cb34d | 43 | gchar *name; |
52330e1a PB |
44 | |
45 | if (!backend->size) { | |
46 | error_setg(errp, "can't create backend with size 0"); | |
47 | return; | |
48 | } | |
49 | if (!fb->mem_path) { | |
c2cb2b04 | 50 | error_setg(errp, "mem-path property not set"); |
52330e1a PB |
51 | return; |
52 | } | |
314aec4a | 53 | |
fa0cb34d | 54 | name = host_memory_backend_get_name(backend); |
9181fb70 DH |
55 | ram_flags = backend->share ? RAM_SHARED : 0; |
56 | ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; | |
57 | ram_flags |= fb->is_pmem ? RAM_PMEM : 0; | |
58 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, | |
59 | backend->size, fb->align, ram_flags, | |
86635aa4 | 60 | fb->mem_path, fb->readonly, errp); |
fa0cb34d | 61 | g_free(name); |
52330e1a PB |
62 | #endif |
63 | } | |
64 | ||
52330e1a PB |
65 | static char *get_mem_path(Object *o, Error **errp) |
66 | { | |
67 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
68 | ||
69 | return g_strdup(fb->mem_path); | |
70 | } | |
71 | ||
72 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
73 | { | |
74 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
75 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
76 | ||
6f4c60e4 | 77 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
78 | error_setg(errp, "cannot change property 'mem-path' of %s", |
79 | object_get_typename(o)); | |
52330e1a PB |
80 | return; |
81 | } | |
ef1e1e07 | 82 | g_free(fb->mem_path); |
52330e1a PB |
83 | fb->mem_path = g_strdup(str); |
84 | } | |
85 | ||
11ae6ed8 EH |
86 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
87 | { | |
88 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
89 | } | |
90 | ||
91 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
92 | Error **errp) | |
93 | { | |
94 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
95 | } | |
96 | ||
98376843 HZ |
97 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
98 | const char *name, void *opaque, | |
99 | Error **errp) | |
100 | { | |
101 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
102 | uint64_t val = fb->align; | |
103 | ||
104 | visit_type_size(v, name, &val, errp); | |
105 | } | |
106 | ||
107 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
108 | const char *name, void *opaque, | |
109 | Error **errp) | |
110 | { | |
111 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
112 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
98376843 HZ |
113 | uint64_t val; |
114 | ||
115 | if (host_memory_backend_mr_inited(backend)) { | |
dcfe4805 MA |
116 | error_setg(errp, "cannot change property '%s' of %s", name, |
117 | object_get_typename(o)); | |
118 | return; | |
98376843 HZ |
119 | } |
120 | ||
668f62ec | 121 | if (!visit_type_size(v, name, &val, errp)) { |
dcfe4805 | 122 | return; |
98376843 HZ |
123 | } |
124 | fb->align = val; | |
98376843 HZ |
125 | } |
126 | ||
def835f0 | 127 | #ifdef CONFIG_LIBPMEM |
a4de8552 JH |
128 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) |
129 | { | |
130 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
131 | } | |
132 | ||
133 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
134 | { | |
135 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
136 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
137 | ||
138 | if (host_memory_backend_mr_inited(backend)) { | |
87dc3ce6 ZY |
139 | error_setg(errp, "cannot change property 'pmem' of %s.", |
140 | object_get_typename(o)); | |
a4de8552 JH |
141 | return; |
142 | } | |
143 | ||
a4de8552 JH |
144 | fb->is_pmem = value; |
145 | } | |
def835f0 | 146 | #endif /* CONFIG_LIBPMEM */ |
a4de8552 | 147 | |
86635aa4 SH |
148 | static bool file_memory_backend_get_readonly(Object *obj, Error **errp) |
149 | { | |
150 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
151 | ||
152 | return fb->readonly; | |
153 | } | |
154 | ||
155 | static void file_memory_backend_set_readonly(Object *obj, bool value, | |
156 | Error **errp) | |
157 | { | |
158 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
159 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
160 | ||
161 | if (host_memory_backend_mr_inited(backend)) { | |
162 | error_setg(errp, "cannot change property 'readonly' of %s.", | |
163 | object_get_typename(obj)); | |
164 | return; | |
165 | } | |
166 | ||
167 | fb->readonly = value; | |
168 | } | |
169 | ||
11ae6ed8 EH |
170 | static void file_backend_unparent(Object *obj) |
171 | { | |
172 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
173 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
174 | ||
175 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
176 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
177 | uint64_t sz = memory_region_size(&backend->mr); | |
178 | ||
179 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
180 | } | |
181 | } | |
182 | ||
52330e1a | 183 | static void |
026ac483 | 184 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 185 | { |
026ac483 EH |
186 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
187 | ||
188 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 189 | oc->unparent = file_backend_unparent; |
026ac483 | 190 | |
11ae6ed8 | 191 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 192 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 193 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 194 | get_mem_path, set_mem_path); |
98376843 HZ |
195 | object_class_property_add(oc, "align", "int", |
196 | file_memory_backend_get_align, | |
197 | file_memory_backend_set_align, | |
d2623129 | 198 | NULL, NULL); |
def835f0 | 199 | #ifdef CONFIG_LIBPMEM |
a4de8552 | 200 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 201 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
def835f0 | 202 | #endif |
86635aa4 SH |
203 | object_class_property_add_bool(oc, "readonly", |
204 | file_memory_backend_get_readonly, | |
205 | file_memory_backend_set_readonly); | |
52330e1a PB |
206 | } |
207 | ||
bc78a013 MAL |
208 | static void file_backend_instance_finalize(Object *o) |
209 | { | |
210 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
211 | ||
212 | g_free(fb->mem_path); | |
213 | } | |
214 | ||
52330e1a PB |
215 | static const TypeInfo file_backend_info = { |
216 | .name = TYPE_MEMORY_BACKEND_FILE, | |
217 | .parent = TYPE_MEMORY_BACKEND, | |
218 | .class_init = file_backend_class_init, | |
bc78a013 | 219 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
220 | .instance_size = sizeof(HostMemoryBackendFile), |
221 | }; | |
222 | ||
223 | static void register_types(void) | |
224 | { | |
225 | type_register_static(&file_backend_info); | |
226 | } | |
227 | ||
228 | type_init(register_types); |