]>
Commit | Line | Data |
---|---|---|
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 | 14 | #include "sysemu/hostmem.h" |
dbb9e0f4 MAL |
15 | #include "qom/object_interfaces.h" |
16 | #include "qemu/memfd.h" | |
0b8fa32f | 17 | #include "qemu/module.h" |
dbb9e0f4 | 18 | #include "qapi/error.h" |
db1015e9 | 19 | #include "qom/object.h" |
dbb9e0f4 MAL |
20 | |
21 | #define TYPE_MEMORY_BACKEND_MEMFD "memory-backend-memfd" | |
22 | ||
8063396b | 23 | OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendMemfd, MEMORY_BACKEND_MEMFD) |
dbb9e0f4 | 24 | |
dbb9e0f4 MAL |
25 | |
26 | struct HostMemoryBackendMemfd { | |
27 | HostMemoryBackend parent_obj; | |
28 | ||
29 | bool hugetlb; | |
30 | uint64_t hugetlbsize; | |
31 | bool seal; | |
32 | }; | |
33 | ||
fdb63cf3 | 34 | static bool |
dbb9e0f4 MAL |
35 | memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) |
36 | { | |
37 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(backend); | |
2d7a1eb6 | 38 | g_autofree char *name = NULL; |
d5015b80 | 39 | uint32_t ram_flags; |
dbb9e0f4 MAL |
40 | int fd; |
41 | ||
42 | if (!backend->size) { | |
43 | error_setg(errp, "can't create backend with size 0"); | |
fdb63cf3 | 44 | return false; |
dbb9e0f4 MAL |
45 | } |
46 | ||
dbb9e0f4 MAL |
47 | fd = qemu_memfd_create(TYPE_MEMORY_BACKEND_MEMFD, backend->size, |
48 | m->hugetlb, m->hugetlbsize, m->seal ? | |
49 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL : 0, | |
50 | errp); | |
51 | if (fd == -1) { | |
fdb63cf3 | 52 | return false; |
dbb9e0f4 MAL |
53 | } |
54 | ||
fa0cb34d | 55 | name = host_memory_backend_get_name(backend); |
d5015b80 | 56 | ram_flags = backend->share ? RAM_SHARED : 0; |
9181fb70 | 57 | ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; |
fdb63cf3 PMD |
58 | return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), name, |
59 | backend->size, ram_flags, fd, 0, errp); | |
dbb9e0f4 MAL |
60 | } |
61 | ||
62 | static bool | |
63 | memfd_backend_get_hugetlb(Object *o, Error **errp) | |
64 | { | |
65 | return MEMORY_BACKEND_MEMFD(o)->hugetlb; | |
66 | } | |
67 | ||
68 | static void | |
69 | memfd_backend_set_hugetlb(Object *o, bool value, Error **errp) | |
70 | { | |
71 | MEMORY_BACKEND_MEMFD(o)->hugetlb = value; | |
72 | } | |
73 | ||
74 | static void | |
75 | memfd_backend_set_hugetlbsize(Object *obj, Visitor *v, const char *name, | |
76 | void *opaque, Error **errp) | |
77 | { | |
78 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
dbb9e0f4 MAL |
79 | uint64_t value; |
80 | ||
81 | if (host_memory_backend_mr_inited(MEMORY_BACKEND(obj))) { | |
dcfe4805 MA |
82 | error_setg(errp, "cannot change property value"); |
83 | return; | |
dbb9e0f4 MAL |
84 | } |
85 | ||
668f62ec | 86 | if (!visit_type_size(v, name, &value, errp)) { |
dcfe4805 | 87 | return; |
dbb9e0f4 MAL |
88 | } |
89 | if (!value) { | |
dcfe4805 MA |
90 | error_setg(errp, "Property '%s.%s' doesn't take value '%" PRIu64 "'", |
91 | object_get_typename(obj), name, value); | |
92 | return; | |
dbb9e0f4 MAL |
93 | } |
94 | m->hugetlbsize = value; | |
dbb9e0f4 MAL |
95 | } |
96 | ||
97 | static void | |
98 | memfd_backend_get_hugetlbsize(Object *obj, Visitor *v, const char *name, | |
99 | void *opaque, Error **errp) | |
100 | { | |
101 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
102 | uint64_t value = m->hugetlbsize; | |
103 | ||
104 | visit_type_size(v, name, &value, errp); | |
105 | } | |
106 | ||
107 | static bool | |
108 | memfd_backend_get_seal(Object *o, Error **errp) | |
109 | { | |
110 | return MEMORY_BACKEND_MEMFD(o)->seal; | |
111 | } | |
112 | ||
113 | static void | |
114 | memfd_backend_set_seal(Object *o, bool value, Error **errp) | |
115 | { | |
116 | MEMORY_BACKEND_MEMFD(o)->seal = value; | |
117 | } | |
118 | ||
119 | static void | |
120 | memfd_backend_instance_init(Object *obj) | |
121 | { | |
122 | HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj); | |
123 | ||
124 | /* default to sealed file */ | |
125 | m->seal = true; | |
36ea3979 | 126 | MEMORY_BACKEND(m)->share = true; |
dbb9e0f4 MAL |
127 | } |
128 | ||
129 | static void | |
130 | memfd_backend_class_init(ObjectClass *oc, void *data) | |
131 | { | |
132 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); | |
133 | ||
134 | bc->alloc = memfd_backend_memory_alloc; | |
135 | ||
38296400 MAL |
136 | if (qemu_memfd_check(MFD_HUGETLB)) { |
137 | object_class_property_add_bool(oc, "hugetlb", | |
138 | memfd_backend_get_hugetlb, | |
d2623129 | 139 | memfd_backend_set_hugetlb); |
033bfc5e | 140 | object_class_property_set_description(oc, "hugetlb", |
7eecec7d | 141 | "Use huge pages"); |
38296400 MAL |
142 | object_class_property_add(oc, "hugetlbsize", "int", |
143 | memfd_backend_get_hugetlbsize, | |
144 | memfd_backend_set_hugetlbsize, | |
d2623129 | 145 | NULL, NULL); |
033bfc5e | 146 | object_class_property_set_description(oc, "hugetlbsize", |
7eecec7d | 147 | "Huge pages size (ex: 2M, 1G)"); |
38296400 | 148 | } |
4a66c7a9 IM |
149 | object_class_property_add_bool(oc, "seal", |
150 | memfd_backend_get_seal, | |
d2623129 | 151 | memfd_backend_set_seal); |
4a66c7a9 | 152 | object_class_property_set_description(oc, "seal", |
7eecec7d | 153 | "Seal growing & shrinking"); |
dbb9e0f4 MAL |
154 | } |
155 | ||
156 | static const TypeInfo memfd_backend_info = { | |
157 | .name = TYPE_MEMORY_BACKEND_MEMFD, | |
158 | .parent = TYPE_MEMORY_BACKEND, | |
159 | .instance_init = memfd_backend_instance_init, | |
160 | .class_init = memfd_backend_class_init, | |
161 | .instance_size = sizeof(HostMemoryBackendMemfd), | |
162 | }; | |
163 | ||
164 | static void register_types(void) | |
165 | { | |
4a66c7a9 | 166 | if (qemu_memfd_check(MFD_ALLOW_SEALING)) { |
38296400 MAL |
167 | type_register_static(&memfd_backend_info); |
168 | } | |
dbb9e0f4 MAL |
169 | } |
170 | ||
171 | type_init(register_types); |