linux-user/aarch64: Signal SEGV_MTEAERR for async tag check error
[qemu/ar7.git] / backends / hostmem-file.c
blob733408e076f3e4c25838adff2ed330b2f42d1fcc
1 /*
2 * QEMU Host Memory Backend for hugetlbfs
4 * Copyright (C) 2013-2014 Red Hat Inc
6 * Authors:
7 * Paolo Bonzini <pbonzini@redhat.com>
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.
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"
22 OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE)
25 struct HostMemoryBackendFile {
26 HostMemoryBackend parent_obj;
28 char *mem_path;
29 uint64_t align;
30 bool discard_data;
31 bool is_pmem;
32 bool readonly;
35 static void
36 file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
38 #ifndef CONFIG_POSIX
39 error_setg(errp, "backend '%s' not supported on this host",
40 object_get_typename(OBJECT(backend)));
41 #else
42 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
43 gchar *name;
45 if (!backend->size) {
46 error_setg(errp, "can't create backend with size 0");
47 return;
49 if (!fb->mem_path) {
50 error_setg(errp, "mem-path property not set");
51 return;
54 name = host_memory_backend_get_name(backend);
55 memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
56 name,
57 backend->size, fb->align,
58 (backend->share ? RAM_SHARED : 0) |
59 (fb->is_pmem ? RAM_PMEM : 0),
60 fb->mem_path, fb->readonly, errp);
61 g_free(name);
62 #endif
65 static char *get_mem_path(Object *o, Error **errp)
67 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
69 return g_strdup(fb->mem_path);
72 static void set_mem_path(Object *o, const char *str, Error **errp)
74 HostMemoryBackend *backend = MEMORY_BACKEND(o);
75 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
77 if (host_memory_backend_mr_inited(backend)) {
78 error_setg(errp, "cannot change property 'mem-path' of %s",
79 object_get_typename(o));
80 return;
82 g_free(fb->mem_path);
83 fb->mem_path = g_strdup(str);
86 static bool file_memory_backend_get_discard_data(Object *o, Error **errp)
88 return MEMORY_BACKEND_FILE(o)->discard_data;
91 static void file_memory_backend_set_discard_data(Object *o, bool value,
92 Error **errp)
94 MEMORY_BACKEND_FILE(o)->discard_data = value;
97 static void file_memory_backend_get_align(Object *o, Visitor *v,
98 const char *name, void *opaque,
99 Error **errp)
101 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
102 uint64_t val = fb->align;
104 visit_type_size(v, name, &val, errp);
107 static void file_memory_backend_set_align(Object *o, Visitor *v,
108 const char *name, void *opaque,
109 Error **errp)
111 HostMemoryBackend *backend = MEMORY_BACKEND(o);
112 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
113 uint64_t val;
115 if (host_memory_backend_mr_inited(backend)) {
116 error_setg(errp, "cannot change property '%s' of %s", name,
117 object_get_typename(o));
118 return;
121 if (!visit_type_size(v, name, &val, errp)) {
122 return;
124 fb->align = val;
127 static bool file_memory_backend_get_pmem(Object *o, Error **errp)
129 return MEMORY_BACKEND_FILE(o)->is_pmem;
132 static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp)
134 HostMemoryBackend *backend = MEMORY_BACKEND(o);
135 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
137 if (host_memory_backend_mr_inited(backend)) {
138 error_setg(errp, "cannot change property 'pmem' of %s.",
139 object_get_typename(o));
140 return;
143 #ifndef CONFIG_LIBPMEM
144 if (value) {
145 error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'"
146 " of %s. We can't ensure data persistence.",
147 object_get_typename(o));
148 return;
150 #endif
152 fb->is_pmem = value;
155 static bool file_memory_backend_get_readonly(Object *obj, Error **errp)
157 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj);
159 return fb->readonly;
162 static void file_memory_backend_set_readonly(Object *obj, bool value,
163 Error **errp)
165 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
166 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj);
168 if (host_memory_backend_mr_inited(backend)) {
169 error_setg(errp, "cannot change property 'readonly' of %s.",
170 object_get_typename(obj));
171 return;
174 fb->readonly = value;
177 static void file_backend_unparent(Object *obj)
179 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
180 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj);
182 if (host_memory_backend_mr_inited(backend) && fb->discard_data) {
183 void *ptr = memory_region_get_ram_ptr(&backend->mr);
184 uint64_t sz = memory_region_size(&backend->mr);
186 qemu_madvise(ptr, sz, QEMU_MADV_REMOVE);
190 static void
191 file_backend_class_init(ObjectClass *oc, void *data)
193 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
195 bc->alloc = file_backend_memory_alloc;
196 oc->unparent = file_backend_unparent;
198 object_class_property_add_bool(oc, "discard-data",
199 file_memory_backend_get_discard_data, file_memory_backend_set_discard_data);
200 object_class_property_add_str(oc, "mem-path",
201 get_mem_path, set_mem_path);
202 object_class_property_add(oc, "align", "int",
203 file_memory_backend_get_align,
204 file_memory_backend_set_align,
205 NULL, NULL);
206 object_class_property_add_bool(oc, "pmem",
207 file_memory_backend_get_pmem, file_memory_backend_set_pmem);
208 object_class_property_add_bool(oc, "readonly",
209 file_memory_backend_get_readonly,
210 file_memory_backend_set_readonly);
213 static void file_backend_instance_finalize(Object *o)
215 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
217 g_free(fb->mem_path);
220 static const TypeInfo file_backend_info = {
221 .name = TYPE_MEMORY_BACKEND_FILE,
222 .parent = TYPE_MEMORY_BACKEND,
223 .class_init = file_backend_class_init,
224 .instance_finalize = file_backend_instance_finalize,
225 .instance_size = sizeof(HostMemoryBackendFile),
228 static void register_types(void)
230 type_register_static(&file_backend_info);
233 type_init(register_types);