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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 | |
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; | |
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); |
fa0cb34d | 42 | gchar *name; |
52330e1a PB |
43 | |
44 | if (!backend->size) { | |
45 | error_setg(errp, "can't create backend with size 0"); | |
46 | return; | |
47 | } | |
48 | if (!fb->mem_path) { | |
c2cb2b04 | 49 | error_setg(errp, "mem-path property not set"); |
52330e1a PB |
50 | return; |
51 | } | |
314aec4a | 52 | |
fa0cb34d | 53 | name = host_memory_backend_get_name(backend); |
86100290 | 54 | memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), |
fa0cb34d | 55 | name, |
86100290 MAL |
56 | backend->size, fb->align, |
57 | (backend->share ? RAM_SHARED : 0) | | |
58 | (fb->is_pmem ? RAM_PMEM : 0), | |
59 | fb->mem_path, errp); | |
fa0cb34d | 60 | g_free(name); |
52330e1a PB |
61 | #endif |
62 | } | |
63 | ||
52330e1a PB |
64 | static char *get_mem_path(Object *o, Error **errp) |
65 | { | |
66 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
67 | ||
68 | return g_strdup(fb->mem_path); | |
69 | } | |
70 | ||
71 | static void set_mem_path(Object *o, const char *str, Error **errp) | |
72 | { | |
73 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
74 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
75 | ||
6f4c60e4 | 76 | if (host_memory_backend_mr_inited(backend)) { |
21d16836 ZY |
77 | error_setg(errp, "cannot change property 'mem-path' of %s", |
78 | object_get_typename(o)); | |
52330e1a PB |
79 | return; |
80 | } | |
ef1e1e07 | 81 | g_free(fb->mem_path); |
52330e1a PB |
82 | fb->mem_path = g_strdup(str); |
83 | } | |
84 | ||
11ae6ed8 EH |
85 | static bool file_memory_backend_get_discard_data(Object *o, Error **errp) |
86 | { | |
87 | return MEMORY_BACKEND_FILE(o)->discard_data; | |
88 | } | |
89 | ||
90 | static void file_memory_backend_set_discard_data(Object *o, bool value, | |
91 | Error **errp) | |
92 | { | |
93 | MEMORY_BACKEND_FILE(o)->discard_data = value; | |
94 | } | |
95 | ||
98376843 HZ |
96 | static void file_memory_backend_get_align(Object *o, Visitor *v, |
97 | const char *name, void *opaque, | |
98 | Error **errp) | |
99 | { | |
100 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
101 | uint64_t val = fb->align; | |
102 | ||
103 | visit_type_size(v, name, &val, errp); | |
104 | } | |
105 | ||
106 | static void file_memory_backend_set_align(Object *o, Visitor *v, | |
107 | const char *name, void *opaque, | |
108 | Error **errp) | |
109 | { | |
110 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
111 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
98376843 HZ |
112 | uint64_t val; |
113 | ||
114 | if (host_memory_backend_mr_inited(backend)) { | |
dcfe4805 MA |
115 | error_setg(errp, "cannot change property '%s' of %s", name, |
116 | object_get_typename(o)); | |
117 | return; | |
98376843 HZ |
118 | } |
119 | ||
668f62ec | 120 | if (!visit_type_size(v, name, &val, errp)) { |
dcfe4805 | 121 | return; |
98376843 HZ |
122 | } |
123 | fb->align = val; | |
98376843 HZ |
124 | } |
125 | ||
a4de8552 JH |
126 | static bool file_memory_backend_get_pmem(Object *o, Error **errp) |
127 | { | |
128 | return MEMORY_BACKEND_FILE(o)->is_pmem; | |
129 | } | |
130 | ||
131 | static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) | |
132 | { | |
133 | HostMemoryBackend *backend = MEMORY_BACKEND(o); | |
134 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
135 | ||
136 | if (host_memory_backend_mr_inited(backend)) { | |
87dc3ce6 ZY |
137 | error_setg(errp, "cannot change property 'pmem' of %s.", |
138 | object_get_typename(o)); | |
a4de8552 JH |
139 | return; |
140 | } | |
141 | ||
142 | #ifndef CONFIG_LIBPMEM | |
143 | if (value) { | |
dcfe4805 | 144 | error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'" |
87dc3ce6 ZY |
145 | " of %s. We can't ensure data persistence.", |
146 | object_get_typename(o)); | |
a4de8552 JH |
147 | return; |
148 | } | |
149 | #endif | |
150 | ||
151 | fb->is_pmem = value; | |
152 | } | |
153 | ||
11ae6ed8 EH |
154 | static void file_backend_unparent(Object *obj) |
155 | { | |
156 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); | |
157 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); | |
158 | ||
159 | if (host_memory_backend_mr_inited(backend) && fb->discard_data) { | |
160 | void *ptr = memory_region_get_ram_ptr(&backend->mr); | |
161 | uint64_t sz = memory_region_size(&backend->mr); | |
162 | ||
163 | qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); | |
164 | } | |
165 | } | |
166 | ||
52330e1a | 167 | static void |
026ac483 | 168 | file_backend_class_init(ObjectClass *oc, void *data) |
52330e1a | 169 | { |
026ac483 EH |
170 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
171 | ||
172 | bc->alloc = file_backend_memory_alloc; | |
11ae6ed8 | 173 | oc->unparent = file_backend_unparent; |
026ac483 | 174 | |
11ae6ed8 | 175 | object_class_property_add_bool(oc, "discard-data", |
d2623129 | 176 | file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); |
026ac483 | 177 | object_class_property_add_str(oc, "mem-path", |
d2623129 | 178 | get_mem_path, set_mem_path); |
98376843 HZ |
179 | object_class_property_add(oc, "align", "int", |
180 | file_memory_backend_get_align, | |
181 | file_memory_backend_set_align, | |
d2623129 | 182 | NULL, NULL); |
a4de8552 | 183 | object_class_property_add_bool(oc, "pmem", |
d2623129 | 184 | file_memory_backend_get_pmem, file_memory_backend_set_pmem); |
52330e1a PB |
185 | } |
186 | ||
bc78a013 MAL |
187 | static void file_backend_instance_finalize(Object *o) |
188 | { | |
189 | HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); | |
190 | ||
191 | g_free(fb->mem_path); | |
192 | } | |
193 | ||
52330e1a PB |
194 | static const TypeInfo file_backend_info = { |
195 | .name = TYPE_MEMORY_BACKEND_FILE, | |
196 | .parent = TYPE_MEMORY_BACKEND, | |
197 | .class_init = file_backend_class_init, | |
bc78a013 | 198 | .instance_finalize = file_backend_instance_finalize, |
52330e1a PB |
199 | .instance_size = sizeof(HostMemoryBackendFile), |
200 | }; | |
201 | ||
202 | static void register_types(void) | |
203 | { | |
204 | type_register_static(&file_backend_info); | |
205 | } | |
206 | ||
207 | type_init(register_types); |