microvm/acpi: disable virtio-mmio cmdline hack
[qemu.git] / backends / hostmem-file.c
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 */
12
13 #include "qemu/osdep.h"
14 #include "qapi/error.h"
15 #include "qemu/error-report.h"
16 #include "qemu/module.h"
17 #include "sysemu/hostmem.h"
18 #include "sysemu/sysemu.h"
19 #include "qom/object_interfaces.h"
20 #include "qom/object.h"
21
22 typedef struct HostMemoryBackendFile HostMemoryBackendFile;
23 DECLARE_INSTANCE_CHECKER(HostMemoryBackendFile, MEMORY_BACKEND_FILE,
24 TYPE_MEMORY_BACKEND_FILE)
25
26
27 struct HostMemoryBackendFile {
28 HostMemoryBackend parent_obj;
29
30 char *mem_path;
31 uint64_t align;
32 bool discard_data;
33 bool is_pmem;
34 };
35
36 static void
37 file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
38 {
39 #ifndef CONFIG_POSIX
40 error_setg(errp, "backend '%s' not supported on this host",
41 object_get_typename(OBJECT(backend)));
42 #else
43 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
44 gchar *name;
45
46 if (!backend->size) {
47 error_setg(errp, "can't create backend with size 0");
48 return;
49 }
50 if (!fb->mem_path) {
51 error_setg(errp, "mem-path property not set");
52 return;
53 }
54
55 name = host_memory_backend_get_name(backend);
56 memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
57 name,
58 backend->size, fb->align,
59 (backend->share ? RAM_SHARED : 0) |
60 (fb->is_pmem ? RAM_PMEM : 0),
61 fb->mem_path, errp);
62 g_free(name);
63 #endif
64 }
65
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
78 if (host_memory_backend_mr_inited(backend)) {
79 error_setg(errp, "cannot change property 'mem-path' of %s",
80 object_get_typename(o));
81 return;
82 }
83 g_free(fb->mem_path);
84 fb->mem_path = g_strdup(str);
85 }
86
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
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);
114 uint64_t val;
115
116 if (host_memory_backend_mr_inited(backend)) {
117 error_setg(errp, "cannot change property '%s' of %s", name,
118 object_get_typename(o));
119 return;
120 }
121
122 if (!visit_type_size(v, name, &val, errp)) {
123 return;
124 }
125 fb->align = val;
126 }
127
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)) {
139 error_setg(errp, "cannot change property 'pmem' of %s.",
140 object_get_typename(o));
141 return;
142 }
143
144 #ifndef CONFIG_LIBPMEM
145 if (value) {
146 error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'"
147 " of %s. We can't ensure data persistence.",
148 object_get_typename(o));
149 return;
150 }
151 #endif
152
153 fb->is_pmem = value;
154 }
155
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
169 static void
170 file_backend_class_init(ObjectClass *oc, void *data)
171 {
172 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
173
174 bc->alloc = file_backend_memory_alloc;
175 oc->unparent = file_backend_unparent;
176
177 object_class_property_add_bool(oc, "discard-data",
178 file_memory_backend_get_discard_data, file_memory_backend_set_discard_data);
179 object_class_property_add_str(oc, "mem-path",
180 get_mem_path, set_mem_path);
181 object_class_property_add(oc, "align", "int",
182 file_memory_backend_get_align,
183 file_memory_backend_set_align,
184 NULL, NULL);
185 object_class_property_add_bool(oc, "pmem",
186 file_memory_backend_get_pmem, file_memory_backend_set_pmem);
187 }
188
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
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,
200 .instance_finalize = file_backend_instance_finalize,
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);