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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 | ||
52330e1a PB |
21 | #define MEMORY_BACKEND_FILE(obj) \ |
22 | OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE) | |
23 | ||
24 | typedef struct HostMemoryBackendFile HostMemoryBackendFile; | |
25 | ||
26 | struct HostMemoryBackendFile { | |
27 | HostMemoryBackend parent_obj; | |
dbcb8981 | 28 | |
52330e1a | 29 | char *mem_path; |
98376843 | 30 | uint64_t align; |
a4de8552 JH |
31 | bool discard_data; |
32 | bool is_pmem; | |
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); |
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); |
86100290 | 55 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), |
fa0cb34d | 56 | name, |
86100290 MAL |
57 | backend->size, fb->align, |
58 | (backend->share ? RAM_SHARED : 0) | | |
59 | (fb->is_pmem ? RAM_PMEM : 0), | |
60 | fb->mem_path, 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 | ||
a4de8552 JH |
127 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) |
128 | { | |
129 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
130 | } | |
131 | ||
132 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
133 | { | |
134 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
135 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
136 | ||
137 | if (host_memory_backend_mr_inited(backend)) { | |
87dc3ce6 ZY |
138 | error_setg(errp, "cannot change property 'pmem' of %s.", |
139 | object_get_typename(o)); | |
a4de8552 JH |
140 | return; |
141 | } | |
142 | ||
143 | #ifndef CONFIG_LIBPMEM | |
144 | if (value) { | |
dcfe4805 | 145 | error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'" |
87dc3ce6 ZY |
146 | " of %s. We can't ensure data persistence.", |
147 | object_get_typename(o)); | |
a4de8552 JH |
148 | return; |
149 | } | |
150 | #endif | |
151 | ||
152 | fb->is_pmem = value; | |
153 | } | |
154 | ||
11ae6ed8 EH |
155 | static void file_backend_unparent(Object *obj) |
156 | { | |
157 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
158 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
159 | ||
160 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
161 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
162 | uint64_t sz = memory_region_size(&backend->mr); | |
163 | ||
164 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
165 | } | |
166 | } | |
167 | ||
52330e1a | 168 | static void |
026ac483 | 169 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 170 | { |
026ac483 EH |
171 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
172 | ||
173 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 174 | oc->unparent = file_backend_unparent; |
026ac483 | 175 | |
11ae6ed8 | 176 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 177 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 178 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 179 | get_mem_path, set_mem_path); |
98376843 HZ |
180 | object_class_property_add(oc, "align", "int", |
181 | file_memory_backend_get_align, | |
182 | file_memory_backend_set_align, | |
d2623129 | 183 | NULL, NULL); |
a4de8552 | 184 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 185 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
52330e1a PB |
186 | } |
187 | ||
bc78a013 MAL |
188 | static void file_backend_instance_finalize(Object *o) |
189 | { | |
190 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
191 | ||
192 | g_free(fb->mem_path); | |
193 | } | |
194 | ||
52330e1a PB |
195 | static const TypeInfo file_backend_info = { |
196 | .name = TYPE_MEMORY_BACKEND_FILE, | |
197 | .parent = TYPE_MEMORY_BACKEND, | |
198 | .class_init = file_backend_class_init, | |
bc78a013 | 199 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
200 | .instance_size = sizeof(HostMemoryBackendFile), |
201 | }; | |
202 | ||
203 | static void register_types(void) | |
204 | { | |
205 | type_register_static(&file_backend_info); | |
206 | } | |
207 | ||
208 | type_init(register_types); |