1 /* 2 * QEMU Host Memory Backend 3 * 4 * Copyright (C) 2013-2014 Red Hat Inc 5 * 6 * Authors: 7 * Igor Mammedov <imammedo@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 #include "sysemu/hostmem.h" 13 #include "sysemu/sysemu.h" 14 #include "qapi/visitor.h" 15 #include "qapi/qmp/qerror.h" 16 #include "qemu/config-file.h" 17 #include "qom/object_interfaces.h" 18 19 static void 20 hostmemory_backend_get_size(Object *obj, Visitor *v, void *opaque, 21 const char *name, Error **errp) 22 { 23 HostMemoryBackend *backend = MEMORY_BACKEND(obj); 24 uint64_t value = backend->size; 25 26 visit_type_size(v, &value, name, errp); 27 } 28 29 static void 30 hostmemory_backend_set_size(Object *obj, Visitor *v, void *opaque, 31 const char *name, Error **errp) 32 { 33 HostMemoryBackend *backend = MEMORY_BACKEND(obj); 34 Error *local_err = NULL; 35 uint64_t value; 36 37 if (memory_region_size(&backend->mr)) { 38 error_setg(&local_err, "cannot change property value"); 39 goto out; 40 } 41 42 visit_type_size(v, &value, name, &local_err); 43 if (local_err) { 44 goto out; 45 } 46 if (!value) { 47 error_setg(&local_err, "Property '%s.%s' doesn't take value '%" 48 PRIu64 "'", object_get_typename(obj), name, value); 49 goto out; 50 } 51 backend->size = value; 52 out: 53 error_propagate(errp, local_err); 54 } 55 56 static void hostmemory_backend_init(Object *obj) 57 { 58 object_property_add(obj, "size", "int", 59 hostmemory_backend_get_size, 60 hostmemory_backend_set_size, NULL, NULL, NULL); 61 } 62 63 static void hostmemory_backend_finalize(Object *obj) 64 { 65 HostMemoryBackend *backend = MEMORY_BACKEND(obj); 66 67 if (memory_region_size(&backend->mr)) { 68 memory_region_destroy(&backend->mr); 69 } 70 } 71 72 MemoryRegion * 73 host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp) 74 { 75 return memory_region_size(&backend->mr) ? &backend->mr : NULL; 76 } 77 78 static const TypeInfo hostmemory_backend_info = { 79 .name = TYPE_MEMORY_BACKEND, 80 .parent = TYPE_OBJECT, 81 .abstract = true, 82 .class_size = sizeof(HostMemoryBackendClass), 83 .instance_size = sizeof(HostMemoryBackend), 84 .instance_init = hostmemory_backend_init, 85 .instance_finalize = hostmemory_backend_finalize, 86 .interfaces = (InterfaceInfo[]) { 87 { TYPE_USER_CREATABLE }, 88 { } 89 } 90 }; 91 92 static void register_types(void) 93 { 94 type_register_static(&hostmemory_backend_info); 95 } 96 97 type_init(register_types); 98