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13#include "qemu/osdep.h"
14#include "qapi/error.h"
15#include "qapi/qapi-commands-machine.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 "hw/qdev-properties.h"
22#include "hw/qdev-properties-system.h"
23#include "migration/vmstate.h"
24#include "sysemu/reset.h"
25
26void vmgenid_build_acpi(VmGenIdState *vms, GArray *table_data, GArray *guid,
27 BIOSLinker *linker, const char *oem_id)
28{
29 Aml *ssdt, *dev, *scope, *method, *addr, *if_ctx;
30 uint32_t vgia_offset;
31 QemuUUID guid_le;
32
33
34
35
36 g_array_set_size(guid, VMGENID_FW_CFG_SIZE - ARRAY_SIZE(guid_le.data));
37 guid_le = qemu_uuid_bswap(vms->guid);
38
39
40
41
42 g_array_insert_vals(guid, VMGENID_GUID_OFFSET, guid_le.data,
43 ARRAY_SIZE(guid_le.data));
44
45
46 ssdt = init_aml_allocator();
47
48
49 acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
50
51
52 vgia_offset = table_data->len +
53 build_append_named_dword(ssdt->buf, "VGIA");
54 scope = aml_scope("\\_SB");
55 dev = aml_device("VGEN");
56 aml_append(dev, aml_name_decl("_HID", aml_string("QEMUVGID")));
57 aml_append(dev, aml_name_decl("_CID", aml_string("VM_Gen_Counter")));
58 aml_append(dev, aml_name_decl("_DDN", aml_string("VM_Gen_Counter")));
59
60
61 method = aml_method("_STA", 0, AML_NOTSERIALIZED);
62 addr = aml_local(0);
63 aml_append(method, aml_store(aml_int(0xf), addr));
64 if_ctx = aml_if(aml_equal(aml_name("VGIA"), aml_int(0)));
65 aml_append(if_ctx, aml_store(aml_int(0), addr));
66 aml_append(method, if_ctx);
67 aml_append(method, aml_return(addr));
68 aml_append(dev, method);
69
70
71
72
73
74 method = aml_method("ADDR", 0, AML_NOTSERIALIZED);
75
76 addr = aml_local(0);
77 aml_append(method, aml_store(aml_package(2), addr));
78
79 aml_append(method, aml_store(aml_add(aml_name("VGIA"),
80 aml_int(VMGENID_GUID_OFFSET), NULL),
81 aml_index(addr, aml_int(0))));
82 aml_append(method, aml_store(aml_int(0), aml_index(addr, aml_int(1))));
83 aml_append(method, aml_return(addr));
84
85 aml_append(dev, method);
86 aml_append(scope, dev);
87 aml_append(ssdt, scope);
88
89
90 method = aml_method("\\_GPE._E05", 0, AML_NOTSERIALIZED);
91 aml_append(method, aml_notify(aml_name("\\_SB.VGEN"), aml_int(0x80)));
92 aml_append(ssdt, method);
93
94 g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
95
96
97 bios_linker_loader_alloc(linker, VMGENID_GUID_FW_CFG_FILE, guid, 4096,
98 false );
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106
107 bios_linker_loader_write_pointer(linker,
108 VMGENID_ADDR_FW_CFG_FILE, 0, sizeof(uint64_t),
109 VMGENID_GUID_FW_CFG_FILE, VMGENID_GUID_OFFSET);
110
111
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113
114
115 bios_linker_loader_add_pointer(linker,
116 ACPI_BUILD_TABLE_FILE, vgia_offset, sizeof(uint32_t),
117 VMGENID_GUID_FW_CFG_FILE, 0);
118
119 build_header(linker, table_data,
120 (void *)(table_data->data + table_data->len - ssdt->buf->len),
121 "SSDT", ssdt->buf->len, 1, oem_id, "VMGENID");
122 free_aml_allocator();
123}
124
125void vmgenid_add_fw_cfg(VmGenIdState *vms, FWCfgState *s, GArray *guid)
126{
127
128 fw_cfg_add_file(s, VMGENID_GUID_FW_CFG_FILE, guid->data,
129 VMGENID_FW_CFG_SIZE);
130
131 fw_cfg_add_file_callback(s, VMGENID_ADDR_FW_CFG_FILE, NULL, NULL, NULL,
132 vms->vmgenid_addr_le,
133 ARRAY_SIZE(vms->vmgenid_addr_le), false);
134}
135
136static void vmgenid_update_guest(VmGenIdState *vms)
137{
138 Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
139 uint32_t vmgenid_addr;
140 QemuUUID guid_le;
141
142 if (obj) {
143
144 memcpy(&vmgenid_addr, vms->vmgenid_addr_le, sizeof(vmgenid_addr));
145 vmgenid_addr = le32_to_cpu(vmgenid_addr);
146
147
148
149 if (vmgenid_addr) {
150
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153
154
155 guid_le = qemu_uuid_bswap(vms->guid);
156
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160 cpu_physical_memory_write(vmgenid_addr, guid_le.data,
161 sizeof(guid_le.data));
162
163 acpi_send_event(DEVICE(obj), ACPI_VMGENID_CHANGE_STATUS);
164 }
165 }
166}
167
168
169
170
171static int vmgenid_post_load(void *opaque, int version_id)
172{
173 VmGenIdState *vms = opaque;
174 vmgenid_update_guest(vms);
175 return 0;
176}
177
178static const VMStateDescription vmstate_vmgenid = {
179 .name = "vmgenid",
180 .version_id = 1,
181 .minimum_version_id = 1,
182 .post_load = vmgenid_post_load,
183 .fields = (VMStateField[]) {
184 VMSTATE_UINT8_ARRAY(vmgenid_addr_le, VmGenIdState, sizeof(uint64_t)),
185 VMSTATE_END_OF_LIST()
186 },
187};
188
189static void vmgenid_handle_reset(void *opaque)
190{
191 VmGenIdState *vms = VMGENID(opaque);
192
193 memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le));
194}
195
196static void vmgenid_realize(DeviceState *dev, Error **errp)
197{
198 VmGenIdState *vms = VMGENID(dev);
199
200 if (!bios_linker_loader_can_write_pointer()) {
201 error_setg(errp, "%s requires DMA write support in fw_cfg, "
202 "which this machine type does not provide", TYPE_VMGENID);
203 return;
204 }
205
206
207
208
209 if (!find_vmgenid_dev()) {
210 error_setg(errp, "at most one %s device is permitted", TYPE_VMGENID);
211 return;
212 }
213
214 qemu_register_reset(vmgenid_handle_reset, vms);
215
216 vmgenid_update_guest(vms);
217}
218
219static Property vmgenid_device_properties[] = {
220 DEFINE_PROP_UUID(VMGENID_GUID, VmGenIdState, guid),
221 DEFINE_PROP_END_OF_LIST(),
222};
223
224static void vmgenid_device_class_init(ObjectClass *klass, void *data)
225{
226 DeviceClass *dc = DEVICE_CLASS(klass);
227
228 dc->vmsd = &vmstate_vmgenid;
229 dc->realize = vmgenid_realize;
230 device_class_set_props(dc, vmgenid_device_properties);
231 dc->hotpluggable = false;
232 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
233}
234
235static const TypeInfo vmgenid_device_info = {
236 .name = TYPE_VMGENID,
237 .parent = TYPE_DEVICE,
238 .instance_size = sizeof(VmGenIdState),
239 .class_init = vmgenid_device_class_init,
240};
241
242static void vmgenid_register_types(void)
243{
244 type_register_static(&vmgenid_device_info);
245}
246
247type_init(vmgenid_register_types)
248
249GuidInfo *qmp_query_vm_generation_id(Error **errp)
250{
251 GuidInfo *info;
252 VmGenIdState *vms;
253 Object *obj = find_vmgenid_dev();
254
255 if (!obj) {
256 error_setg(errp, "VM Generation ID device not found");
257 return NULL;
258 }
259 vms = VMGENID(obj);
260
261 info = g_malloc0(sizeof(*info));
262 info->guid = qemu_uuid_unparse_strdup(&vms->guid);
263 return info;
264}
265