4 * Copyright IBM, Corp. 2013
7 * Stefan Berger <stefanb@us.ibm.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.
12 * Based on backends/rng.c by Anthony Liguori
15 #include "qemu/osdep.h"
16 #include "sysemu/tpm_backend.h"
17 #include "qapi/error.h"
18 #include "qapi/qmp/qerror.h"
19 #include "sysemu/tpm.h"
20 #include "qemu/thread.h"
21 #include "qemu/main-loop.h"
22 #include "block/thread-pool.h"
23 #include "qemu/error-report.h"
25 static void tpm_backend_request_completed(void *opaque
, int ret
)
27 TPMBackend
*s
= TPM_BACKEND(opaque
);
28 TPMIfClass
*tic
= TPM_IF_GET_CLASS(s
->tpmif
);
30 tic
->request_completed(s
->tpmif
);
32 /* no need for atomic, as long the BQL is taken */
34 object_unref(OBJECT(s
));
37 static int tpm_backend_worker_thread(gpointer data
)
39 TPMBackend
*s
= TPM_BACKEND(data
);
40 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
42 k
->handle_request(s
, s
->cmd
);
47 void tpm_backend_finish_sync(TPMBackend
*s
)
50 aio_poll(qemu_get_aio_context(), true);
54 enum TpmType
tpm_backend_get_type(TPMBackend
*s
)
56 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
61 int tpm_backend_init(TPMBackend
*s
, TPMIf
*tpmif
, Error
**errp
)
64 error_setg(errp
, "TPM backend '%s' is already initialized", s
->id
);
69 object_ref(OBJECT(tpmif
));
71 s
->had_startup_error
= false;
76 int tpm_backend_startup_tpm(TPMBackend
*s
, size_t buffersize
)
79 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
81 /* terminate a running TPM */
82 tpm_backend_finish_sync(s
);
84 res
= k
->startup_tpm
? k
->startup_tpm(s
, buffersize
) : 0;
86 s
->had_startup_error
= (res
!= 0);
91 bool tpm_backend_had_startup_error(TPMBackend
*s
)
93 return s
->had_startup_error
;
96 void tpm_backend_deliver_request(TPMBackend
*s
, TPMBackendCmd
*cmd
)
98 ThreadPool
*pool
= aio_get_thread_pool(qemu_get_aio_context());
100 if (s
->cmd
!= NULL
) {
101 error_report("There is a TPM request pending");
106 object_ref(OBJECT(s
));
107 thread_pool_submit_aio(pool
, tpm_backend_worker_thread
, s
,
108 tpm_backend_request_completed
, s
);
111 void tpm_backend_reset(TPMBackend
*s
)
113 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
119 tpm_backend_finish_sync(s
);
121 s
->had_startup_error
= false;
124 void tpm_backend_cancel_cmd(TPMBackend
*s
)
126 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
131 bool tpm_backend_get_tpm_established_flag(TPMBackend
*s
)
133 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
135 return k
->get_tpm_established_flag
?
136 k
->get_tpm_established_flag(s
) : false;
139 int tpm_backend_reset_tpm_established_flag(TPMBackend
*s
, uint8_t locty
)
141 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
143 return k
->reset_tpm_established_flag
?
144 k
->reset_tpm_established_flag(s
, locty
) : 0;
147 TPMVersion
tpm_backend_get_tpm_version(TPMBackend
*s
)
149 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
151 return k
->get_tpm_version(s
);
154 size_t tpm_backend_get_buffer_size(TPMBackend
*s
)
156 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
158 return k
->get_buffer_size(s
);
161 TPMInfo
*tpm_backend_query_tpm(TPMBackend
*s
)
163 TPMInfo
*info
= g_new0(TPMInfo
, 1);
164 TPMBackendClass
*k
= TPM_BACKEND_GET_CLASS(s
);
165 TPMIfClass
*tic
= TPM_IF_GET_CLASS(s
->tpmif
);
167 info
->id
= g_strdup(s
->id
);
168 info
->model
= tic
->model
;
169 info
->options
= k
->get_tpm_options(s
);
174 static void tpm_backend_instance_finalize(Object
*obj
)
176 TPMBackend
*s
= TPM_BACKEND(obj
);
178 object_unref(OBJECT(s
->tpmif
));
182 static const TypeInfo tpm_backend_info
= {
183 .name
= TYPE_TPM_BACKEND
,
184 .parent
= TYPE_OBJECT
,
185 .instance_size
= sizeof(TPMBackend
),
186 .instance_finalize
= tpm_backend_instance_finalize
,
187 .class_size
= sizeof(TPMBackendClass
),
191 static const TypeInfo tpm_if_info
= {
193 .parent
= TYPE_INTERFACE
,
194 .class_size
= sizeof(TPMIfClass
),
197 static void register_types(void)
199 type_register_static(&tpm_backend_info
);
200 type_register_static(&tpm_if_info
);
203 type_init(register_types
);