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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 | 19 | #include "qom/object_interfaces.h" |
db1015e9 | 20 | #include "qom/object.h" |
52330e1a | 21 | |
db1015e9 | 22 | typedef struct HostMemoryBackendFile HostMemoryBackendFile; |
8110fa1d EH |
23 | DECLARE_INSTANCE_CHECKER(HostMemoryBackendFile, MEMORY_BACKEND_FILE, |
24 | TYPE_MEMORY_BACKEND_FILE) | |
52330e1a | 25 | |
52330e1a PB |
26 | |
27 | struct HostMemoryBackendFile { | |
28 | HostMemoryBackend parent_obj; | |
dbcb8981 | 29 | |
52330e1a | 30 | char *mem_path; |
98376843 | 31 | uint64_t align; |
a4de8552 JH |
32 | bool discard_data; |
33 | bool is_pmem; | |
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); |
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); |
86100290 | 56 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), |
fa0cb34d | 57 | name, |
86100290 MAL |
58 | backend->size, fb->align, |
59 | (backend->share ? RAM_SHARED : 0) | | |
60 | (fb->is_pmem ? RAM_PMEM : 0), | |
61 | fb->mem_path, 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 | ||
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 | ||
144 | #ifndef CONFIG_LIBPMEM | |
145 | if (value) { | |
dcfe4805 | 146 | error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'" |
87dc3ce6 ZY |
147 | " of %s. We can't ensure data persistence.", |
148 | object_get_typename(o)); | |
a4de8552 JH |
149 | return; |
150 | } | |
151 | #endif | |
152 | ||
153 | fb->is_pmem = value; | |
154 | } | |
155 | ||
11ae6ed8 EH |
156 | static void file_backend_unparent(Object *obj) |
157 | { | |
158 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
159 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
160 | ||
161 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
162 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
163 | uint64_t sz = memory_region_size(&backend->mr); | |
164 | ||
165 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
166 | } | |
167 | } | |
168 | ||
52330e1a | 169 | static void |
026ac483 | 170 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 171 | { |
026ac483 EH |
172 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
173 | ||
174 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 175 | oc->unparent = file_backend_unparent; |
026ac483 | 176 | |
11ae6ed8 | 177 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 178 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 179 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 180 | get_mem_path, set_mem_path); |
98376843 HZ |
181 | object_class_property_add(oc, "align", "int", |
182 | file_memory_backend_get_align, | |
183 | file_memory_backend_set_align, | |
d2623129 | 184 | NULL, NULL); |
a4de8552 | 185 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 186 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
52330e1a PB |
187 | } |
188 | ||
bc78a013 MAL |
189 | static void file_backend_instance_finalize(Object *o) |
190 | { | |
191 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
192 | ||
193 | g_free(fb->mem_path); | |
194 | } | |
195 | ||
52330e1a PB |
196 | static const TypeInfo file_backend_info = { |
197 | .name = TYPE_MEMORY_BACKEND_FILE, | |
198 | .parent = TYPE_MEMORY_BACKEND, | |
199 | .class_init = file_backend_class_init, | |
bc78a013 | 200 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
201 | .instance_size = sizeof(HostMemoryBackendFile), |
202 | }; | |
203 | ||
204 | static void register_types(void) | |
205 | { | |
206 | type_register_static(&file_backend_info); | |
207 | } | |
208 | ||
209 | type_init(register_types); |