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13#include "qemu/osdep.h"
14#include "qapi/error.h"
15#include "qapi/qapi-commands-misc.h"
16#include "qemu/module.h"
17#include "hw/acpi/acpi.h"
18#include "hw/acpi/aml-build.h"
19#include "hw/acpi/vmgenid.h"
20#include "hw/nvram/fw_cfg.h"
21#include "sysemu/sysemu.h"
22
23void vmgenid_build_acpi(VmGenIdState *vms, GArray *table_data, GArray *guid,
24 BIOSLinker *linker)
25{
26 Aml *ssdt, *dev, *scope, *method, *addr, *if_ctx;
27 uint32_t vgia_offset;
28 QemuUUID guid_le;
29
30
31
32
33 g_array_set_size(guid, VMGENID_FW_CFG_SIZE - ARRAY_SIZE(guid_le.data));
34 guid_le = qemu_uuid_bswap(vms->guid);
35
36
37
38
39 g_array_insert_vals(guid, VMGENID_GUID_OFFSET, guid_le.data,
40 ARRAY_SIZE(guid_le.data));
41
42
43 ssdt = init_aml_allocator();
44
45
46 acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
47
48
49 vgia_offset = table_data->len +
50 build_append_named_dword(ssdt->buf, "VGIA");
51 scope = aml_scope("\\_SB");
52 dev = aml_device("VGEN");
53 aml_append(dev, aml_name_decl("_HID", aml_string("QEMUVGID")));
54 aml_append(dev, aml_name_decl("_CID", aml_string("VM_Gen_Counter")));
55 aml_append(dev, aml_name_decl("_DDN", aml_string("VM_Gen_Counter")));
56
57
58 method = aml_method("_STA", 0, AML_NOTSERIALIZED);
59 addr = aml_local(0);
60 aml_append(method, aml_store(aml_int(0xf), addr));
61 if_ctx = aml_if(aml_equal(aml_name("VGIA"), aml_int(0)));
62 aml_append(if_ctx, aml_store(aml_int(0), addr));
63 aml_append(method, if_ctx);
64 aml_append(method, aml_return(addr));
65 aml_append(dev, method);
66
67
68
69
70
71 method = aml_method("ADDR", 0, AML_NOTSERIALIZED);
72
73 addr = aml_local(0);
74 aml_append(method, aml_store(aml_package(2), addr));
75
76 aml_append(method, aml_store(aml_add(aml_name("VGIA"),
77 aml_int(VMGENID_GUID_OFFSET), NULL),
78 aml_index(addr, aml_int(0))));
79 aml_append(method, aml_store(aml_int(0), aml_index(addr, aml_int(1))));
80 aml_append(method, aml_return(addr));
81
82 aml_append(dev, method);
83 aml_append(scope, dev);
84 aml_append(ssdt, scope);
85
86
87 method = aml_method("\\_GPE._E05", 0, AML_NOTSERIALIZED);
88 aml_append(method, aml_notify(aml_name("\\_SB.VGEN"), aml_int(0x80)));
89 aml_append(ssdt, method);
90
91 g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
92
93
94 bios_linker_loader_alloc(linker, VMGENID_GUID_FW_CFG_FILE, guid, 4096,
95 false );
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104 bios_linker_loader_write_pointer(linker,
105 VMGENID_ADDR_FW_CFG_FILE, 0, sizeof(uint64_t),
106 VMGENID_GUID_FW_CFG_FILE, VMGENID_GUID_OFFSET);
107
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111
112 bios_linker_loader_add_pointer(linker,
113 ACPI_BUILD_TABLE_FILE, vgia_offset, sizeof(uint32_t),
114 VMGENID_GUID_FW_CFG_FILE, 0);
115
116 build_header(linker, table_data,
117 (void *)(table_data->data + table_data->len - ssdt->buf->len),
118 "SSDT", ssdt->buf->len, 1, NULL, "VMGENID");
119 free_aml_allocator();
120}
121
122void vmgenid_add_fw_cfg(VmGenIdState *vms, FWCfgState *s, GArray *guid)
123{
124
125 fw_cfg_add_file(s, VMGENID_GUID_FW_CFG_FILE, guid->data,
126 VMGENID_FW_CFG_SIZE);
127
128 fw_cfg_add_file_callback(s, VMGENID_ADDR_FW_CFG_FILE, NULL, NULL, NULL,
129 vms->vmgenid_addr_le,
130 ARRAY_SIZE(vms->vmgenid_addr_le), false);
131}
132
133static void vmgenid_update_guest(VmGenIdState *vms)
134{
135 Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
136 uint32_t vmgenid_addr;
137 QemuUUID guid_le;
138
139 if (obj) {
140
141 memcpy(&vmgenid_addr, vms->vmgenid_addr_le, sizeof(vmgenid_addr));
142 vmgenid_addr = le32_to_cpu(vmgenid_addr);
143
144
145
146 if (vmgenid_addr) {
147
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151
152 guid_le = qemu_uuid_bswap(vms->guid);
153
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157 cpu_physical_memory_write(vmgenid_addr, guid_le.data,
158 sizeof(guid_le.data));
159
160 acpi_send_event(DEVICE(obj), ACPI_VMGENID_CHANGE_STATUS);
161 }
162 }
163}
164
165
166
167
168static int vmgenid_post_load(void *opaque, int version_id)
169{
170 VmGenIdState *vms = opaque;
171 vmgenid_update_guest(vms);
172 return 0;
173}
174
175static const VMStateDescription vmstate_vmgenid = {
176 .name = "vmgenid",
177 .version_id = 1,
178 .minimum_version_id = 1,
179 .post_load = vmgenid_post_load,
180 .fields = (VMStateField[]) {
181 VMSTATE_UINT8_ARRAY(vmgenid_addr_le, VmGenIdState, sizeof(uint64_t)),
182 VMSTATE_END_OF_LIST()
183 },
184};
185
186static void vmgenid_handle_reset(void *opaque)
187{
188 VmGenIdState *vms = VMGENID(opaque);
189
190 memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le));
191}
192
193static void vmgenid_realize(DeviceState *dev, Error **errp)
194{
195 VmGenIdState *vms = VMGENID(dev);
196
197 if (!bios_linker_loader_can_write_pointer()) {
198 error_setg(errp, "%s requires DMA write support in fw_cfg, "
199 "which this machine type does not provide", VMGENID_DEVICE);
200 return;
201 }
202
203
204
205
206 if (!find_vmgenid_dev()) {
207 error_setg(errp, "at most one %s device is permitted", VMGENID_DEVICE);
208 return;
209 }
210
211 qemu_register_reset(vmgenid_handle_reset, vms);
212
213 vmgenid_update_guest(vms);
214}
215
216static Property vmgenid_device_properties[] = {
217 DEFINE_PROP_UUID(VMGENID_GUID, VmGenIdState, guid),
218 DEFINE_PROP_END_OF_LIST(),
219};
220
221static void vmgenid_device_class_init(ObjectClass *klass, void *data)
222{
223 DeviceClass *dc = DEVICE_CLASS(klass);
224
225 dc->vmsd = &vmstate_vmgenid;
226 dc->realize = vmgenid_realize;
227 dc->props = vmgenid_device_properties;
228 dc->hotpluggable = false;
229 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
230}
231
232static const TypeInfo vmgenid_device_info = {
233 .name = VMGENID_DEVICE,
234 .parent = TYPE_DEVICE,
235 .instance_size = sizeof(VmGenIdState),
236 .class_init = vmgenid_device_class_init,
237};
238
239static void vmgenid_register_types(void)
240{
241 type_register_static(&vmgenid_device_info);
242}
243
244type_init(vmgenid_register_types)
245
246GuidInfo *qmp_query_vm_generation_id(Error **errp)
247{
248 GuidInfo *info;
249 VmGenIdState *vms;
250 Object *obj = find_vmgenid_dev();
251
252 if (!obj) {
253 error_setg(errp, "VM Generation ID device not found");
254 return NULL;
255 }
256 vms = VMGENID(obj);
257
258 info = g_malloc0(sizeof(*info));
259 info->guid = qemu_uuid_unparse_strdup(&vms->guid);
260 return info;
261}
262