]> git.proxmox.com Git - mirror_qemu.git/blame - backends/hostmem-file.c
target/ppc: Add POWER9/ISAv3.00 to compat_table
[mirror_qemu.git] / backends / hostmem-file.c
CommitLineData
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 */
9c058332 12#include "qemu/osdep.h"
da34e65c 13#include "qapi/error.h"
a35ba7be 14#include "qemu-common.h"
52330e1a 15#include "sysemu/hostmem.h"
a35ba7be 16#include "sysemu/sysemu.h"
52330e1a
PB
17#include "qom/object_interfaces.h"
18
19/* hostmem-file.c */
20/**
21 * @TYPE_MEMORY_BACKEND_FILE:
22 * name of backend that uses mmap on a file descriptor
23 */
24#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file"
25
26#define MEMORY_BACKEND_FILE(obj) \
27 OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE)
28
29typedef struct HostMemoryBackendFile HostMemoryBackendFile;
30
31struct HostMemoryBackendFile {
32 HostMemoryBackend parent_obj;
dbcb8981
PB
33
34 bool share;
52330e1a
PB
35 char *mem_path;
36};
37
38static void
39file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
40{
41 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
42
43 if (!backend->size) {
44 error_setg(errp, "can't create backend with size 0");
45 return;
46 }
47 if (!fb->mem_path) {
c2cb2b04 48 error_setg(errp, "mem-path property not set");
52330e1a
PB
49 return;
50 }
51#ifndef CONFIG_LINUX
52 error_setg(errp, "-mem-path not supported on this host");
53#else
54 if (!memory_region_size(&backend->mr)) {
696b5501 55 gchar *path;
a35ba7be 56 backend->force_prealloc = mem_prealloc;
696b5501 57 path = object_get_canonical_path(OBJECT(backend));
52330e1a 58 memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
696b5501 59 path,
dbcb8981 60 backend->size, fb->share,
52330e1a 61 fb->mem_path, errp);
696b5501 62 g_free(path);
52330e1a
PB
63 }
64#endif
65}
66
52330e1a
PB
67static char *get_mem_path(Object *o, Error **errp)
68{
69 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
70
71 return g_strdup(fb->mem_path);
72}
73
74static void set_mem_path(Object *o, const char *str, Error **errp)
75{
76 HostMemoryBackend *backend = MEMORY_BACKEND(o);
77 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
78
79 if (memory_region_size(&backend->mr)) {
80 error_setg(errp, "cannot change property value");
81 return;
82 }
ef1e1e07 83 g_free(fb->mem_path);
52330e1a
PB
84 fb->mem_path = g_strdup(str);
85}
86
dbcb8981
PB
87static bool file_memory_backend_get_share(Object *o, Error **errp)
88{
89 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
90
91 return fb->share;
92}
93
94static void file_memory_backend_set_share(Object *o, bool value, Error **errp)
95{
96 HostMemoryBackend *backend = MEMORY_BACKEND(o);
97 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
98
99 if (memory_region_size(&backend->mr)) {
100 error_setg(errp, "cannot change property value");
101 return;
102 }
103 fb->share = value;
104}
105
52330e1a 106static void
026ac483 107file_backend_class_init(ObjectClass *oc, void *data)
52330e1a 108{
026ac483
EH
109 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
110
111 bc->alloc = file_backend_memory_alloc;
112
113 object_class_property_add_bool(oc, "share",
114 file_memory_backend_get_share, file_memory_backend_set_share,
115 &error_abort);
116 object_class_property_add_str(oc, "mem-path",
117 get_mem_path, set_mem_path,
118 &error_abort);
52330e1a
PB
119}
120
bc78a013
MAL
121static void file_backend_instance_finalize(Object *o)
122{
123 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
124
125 g_free(fb->mem_path);
126}
127
52330e1a
PB
128static const TypeInfo file_backend_info = {
129 .name = TYPE_MEMORY_BACKEND_FILE,
130 .parent = TYPE_MEMORY_BACKEND,
131 .class_init = file_backend_class_init,
bc78a013 132 .instance_finalize = file_backend_instance_finalize,
52330e1a
PB
133 .instance_size = sizeof(HostMemoryBackendFile),
134};
135
136static void register_types(void)
137{
138 type_register_static(&file_backend_info);
139}
140
141type_init(register_types);