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dbb9e0f4 MAL |
1 | /* |
2 | * QEMU host memfd memory backend | |
3 | * | |
4 | * Copyright (C) 2018 Red Hat Inc | |
5 | * | |
6 | * Authors: | |
7 | * Marc-André Lureau <marcandre.lureau@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 | |
dbb9e0f4 | 13 | #include "qemu/osdep.h" |
dbb9e0f4 MAL |
14 | #include "sysemu/hostmem.h" |
15 | #include "sysemu/sysemu.h" | |
16 | #include "qom/object_interfaces.h" | |
17 | #include "qemu/memfd.h" | |
0b8fa32f | 18 | #include "qemu/module.h" |
dbb9e0f4 MAL |
19 | #include "qapi/error.h" |
20 | ||
21 | #define TYPE_MEMORY_BACKEND_MEMFD "memory-backend-memfd" | |
22 | ||
23 | #define MEMORY_BACKEND_MEMFD(obj) \ | |
24 | OBJECT_CHECK(HostMemoryBackendMemfd, (obj), TYPE_MEMORY_BACKEND_MEMFD) | |
25 | ||
26 | typedef struct HostMemoryBackendMemfd HostMemoryBackendMemfd; | |
27 | ||
28 | struct HostMemoryBackendMemfd { | |
29 | HostMemoryBackend parent_obj; | |
30 | ||
31 | bool hugetlb; | |
32 | uint64_t hugetlbsize; | |
33 | bool seal; | |
34 | }; | |
35 | ||
36 | static void | |
37 | memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) | |
38 | { | |
39 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(backend); | |
40 | char *name; | |
41 | int fd; | |
42 | ||
43 | if (!backend->size) { | |
44 | error_setg(errp, "can't create backend with size 0"); | |
45 | return; | |
46 | } | |
47 | ||
dbb9e0f4 MAL |
48 | backend->force_prealloc = mem_prealloc; |
49 | fd = qemu_memfd_create(TYPE_MEMORY_BACKEND_MEMFD, backend->size, | |
50 | m->hugetlb, m->hugetlbsize, m->seal ? | |
51 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL : 0, | |
52 | errp); | |
53 | if (fd == -1) { | |
54 | return; | |
55 | } | |
56 | ||
fa0cb34d | 57 | name = host_memory_backend_get_name(backend); |
dbb9e0f4 | 58 | memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), |
36ea3979 MAL |
59 | name, backend->size, |
60 | backend->share, fd, errp); | |
dbb9e0f4 MAL |
61 | g_free(name); |
62 | } | |
63 | ||
64 | static bool | |
65 | memfd_backend_get_hugetlb(Object *o, Error **errp) | |
66 | { | |
67 | return MEMORY_BACKEND_MEMFD(o)->hugetlb; | |
68 | } | |
69 | ||
70 | static void | |
71 | memfd_backend_set_hugetlb(Object *o, bool value, Error **errp) | |
72 | { | |
73 | MEMORY_BACKEND_MEMFD(o)->hugetlb = value; | |
74 | } | |
75 | ||
76 | static void | |
77 | memfd_backend_set_hugetlbsize(Object *obj, Visitor *v, const char *name, | |
78 | void *opaque, Error **errp) | |
79 | { | |
80 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
81 | Error *local_err = NULL; | |
82 | uint64_t value; | |
83 | ||
84 | if (host_memory_backend_mr_inited(MEMORY_BACKEND(obj))) { | |
85 | error_setg(&local_err, "cannot change property value"); | |
86 | goto out; | |
87 | } | |
88 | ||
89 | visit_type_size(v, name, &value, &local_err); | |
90 | if (local_err) { | |
91 | goto out; | |
92 | } | |
93 | if (!value) { | |
94 | error_setg(&local_err, "Property '%s.%s' doesn't take value '%" | |
95 | PRIu64 "'", object_get_typename(obj), name, value); | |
96 | goto out; | |
97 | } | |
98 | m->hugetlbsize = value; | |
99 | out: | |
100 | error_propagate(errp, local_err); | |
101 | } | |
102 | ||
103 | static void | |
104 | memfd_backend_get_hugetlbsize(Object *obj, Visitor *v, const char *name, | |
105 | void *opaque, Error **errp) | |
106 | { | |
107 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
108 | uint64_t value = m->hugetlbsize; | |
109 | ||
110 | visit_type_size(v, name, &value, errp); | |
111 | } | |
112 | ||
113 | static bool | |
114 | memfd_backend_get_seal(Object *o, Error **errp) | |
115 | { | |
116 | return MEMORY_BACKEND_MEMFD(o)->seal; | |
117 | } | |
118 | ||
119 | static void | |
120 | memfd_backend_set_seal(Object *o, bool value, Error **errp) | |
121 | { | |
122 | MEMORY_BACKEND_MEMFD(o)->seal = value; | |
123 | } | |
124 | ||
125 | static void | |
126 | memfd_backend_instance_init(Object *obj) | |
127 | { | |
128 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
129 | ||
130 | /* default to sealed file */ | |
131 | m->seal = true; | |
36ea3979 | 132 | MEMORY_BACKEND(m)->share = true; |
dbb9e0f4 MAL |
133 | } |
134 | ||
135 | static void | |
136 | memfd_backend_class_init(ObjectClass *oc, void *data) | |
137 | { | |
138 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); | |
139 | ||
140 | bc->alloc = memfd_backend_memory_alloc; | |
141 | ||
38296400 MAL |
142 | if (qemu_memfd_check(MFD_HUGETLB)) { |
143 | object_class_property_add_bool(oc, "hugetlb", | |
144 | memfd_backend_get_hugetlb, | |
145 | memfd_backend_set_hugetlb, | |
146 | &error_abort); | |
033bfc5e MAL |
147 | object_class_property_set_description(oc, "hugetlb", |
148 | "Use huge pages", | |
149 | &error_abort); | |
38296400 MAL |
150 | object_class_property_add(oc, "hugetlbsize", "int", |
151 | memfd_backend_get_hugetlbsize, | |
152 | memfd_backend_set_hugetlbsize, | |
153 | NULL, NULL, &error_abort); | |
033bfc5e MAL |
154 | object_class_property_set_description(oc, "hugetlbsize", |
155 | "Huge pages size (ex: 2M, 1G)", | |
156 | &error_abort); | |
38296400 | 157 | } |
4a66c7a9 IM |
158 | object_class_property_add_bool(oc, "seal", |
159 | memfd_backend_get_seal, | |
160 | memfd_backend_set_seal, | |
161 | &error_abort); | |
162 | object_class_property_set_description(oc, "seal", | |
163 | "Seal growing & shrinking", | |
164 | &error_abort); | |
dbb9e0f4 MAL |
165 | } |
166 | ||
167 | static const TypeInfo memfd_backend_info = { | |
168 | .name = TYPE_MEMORY_BACKEND_MEMFD, | |
169 | .parent = TYPE_MEMORY_BACKEND, | |
170 | .instance_init = memfd_backend_instance_init, | |
171 | .class_init = memfd_backend_class_init, | |
172 | .instance_size = sizeof(HostMemoryBackendMemfd), | |
173 | }; | |
174 | ||
175 | static void register_types(void) | |
176 | { | |
4a66c7a9 | 177 | if (qemu_memfd_check(MFD_ALLOW_SEALING)) { |
38296400 MAL |
178 | type_register_static(&memfd_backend_info); |
179 | } | |
dbb9e0f4 MAL |
180 | } |
181 | ||
182 | type_init(register_types); |