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1 | /* | |
2 | * QEMU TPM Backend | |
3 | * | |
4 | * Copyright IBM, Corp. 2013 | |
5 | * | |
6 | * Authors: | |
7 | * Stefan Berger <stefanb@us.ibm.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 | * Based on backends/rng.c by Anthony Liguori | |
13 | */ | |
14 | ||
15 | #include "qemu/osdep.h" | |
16 | #include "sysemu/tpm_backend.h" | |
17 | #include "qapi/error.h" | |
18 | #include "sysemu/tpm.h" | |
19 | #include "qemu/thread.h" | |
20 | #include "qemu/main-loop.h" | |
21 | #include "block/thread-pool.h" | |
22 | #include "qemu/error-report.h" | |
23 | ||
24 | static void tpm_backend_request_completed(void *opaque, int ret) | |
25 | { | |
26 | TPMBackend *s = TPM_BACKEND(opaque); | |
27 | TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif); | |
28 | ||
29 | tic->request_completed(s->tpmif, ret); | |
30 | ||
31 | /* no need for atomic, as long the BQL is taken */ | |
32 | s->cmd = NULL; | |
33 | object_unref(OBJECT(s)); | |
34 | } | |
35 | ||
36 | static int tpm_backend_worker_thread(gpointer data) | |
37 | { | |
38 | TPMBackend *s = TPM_BACKEND(data); | |
39 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
40 | Error *err = NULL; | |
41 | ||
42 | k->handle_request(s, s->cmd, &err); | |
43 | if (err) { | |
44 | error_report_err(err); | |
45 | return -1; | |
46 | } | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | void tpm_backend_finish_sync(TPMBackend *s) | |
52 | { | |
53 | while (s->cmd) { | |
54 | aio_poll(qemu_get_aio_context(), true); | |
55 | } | |
56 | } | |
57 | ||
58 | enum TpmType tpm_backend_get_type(TPMBackend *s) | |
59 | { | |
60 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
61 | ||
62 | return k->type; | |
63 | } | |
64 | ||
65 | int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp) | |
66 | { | |
67 | if (s->tpmif) { | |
68 | error_setg(errp, "TPM backend '%s' is already initialized", s->id); | |
69 | return -1; | |
70 | } | |
71 | ||
72 | s->tpmif = tpmif; | |
73 | object_ref(OBJECT(tpmif)); | |
74 | ||
75 | s->had_startup_error = false; | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize) | |
81 | { | |
82 | int res = 0; | |
83 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
84 | ||
85 | /* terminate a running TPM */ | |
86 | tpm_backend_finish_sync(s); | |
87 | ||
88 | res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0; | |
89 | ||
90 | s->had_startup_error = (res != 0); | |
91 | ||
92 | return res; | |
93 | } | |
94 | ||
95 | bool tpm_backend_had_startup_error(TPMBackend *s) | |
96 | { | |
97 | return s->had_startup_error; | |
98 | } | |
99 | ||
100 | void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd) | |
101 | { | |
102 | ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context()); | |
103 | ||
104 | if (s->cmd != NULL) { | |
105 | error_report("There is a TPM request pending"); | |
106 | return; | |
107 | } | |
108 | ||
109 | s->cmd = cmd; | |
110 | object_ref(OBJECT(s)); | |
111 | thread_pool_submit_aio(pool, tpm_backend_worker_thread, s, | |
112 | tpm_backend_request_completed, s); | |
113 | } | |
114 | ||
115 | void tpm_backend_reset(TPMBackend *s) | |
116 | { | |
117 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
118 | ||
119 | if (k->reset) { | |
120 | k->reset(s); | |
121 | } | |
122 | ||
123 | tpm_backend_finish_sync(s); | |
124 | ||
125 | s->had_startup_error = false; | |
126 | } | |
127 | ||
128 | void tpm_backend_cancel_cmd(TPMBackend *s) | |
129 | { | |
130 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
131 | ||
132 | k->cancel_cmd(s); | |
133 | } | |
134 | ||
135 | bool tpm_backend_get_tpm_established_flag(TPMBackend *s) | |
136 | { | |
137 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
138 | ||
139 | return k->get_tpm_established_flag ? | |
140 | k->get_tpm_established_flag(s) : false; | |
141 | } | |
142 | ||
143 | int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty) | |
144 | { | |
145 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
146 | ||
147 | return k->reset_tpm_established_flag ? | |
148 | k->reset_tpm_established_flag(s, locty) : 0; | |
149 | } | |
150 | ||
151 | TPMVersion tpm_backend_get_tpm_version(TPMBackend *s) | |
152 | { | |
153 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
154 | ||
155 | return k->get_tpm_version(s); | |
156 | } | |
157 | ||
158 | size_t tpm_backend_get_buffer_size(TPMBackend *s) | |
159 | { | |
160 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
161 | ||
162 | return k->get_buffer_size(s); | |
163 | } | |
164 | ||
165 | TPMInfo *tpm_backend_query_tpm(TPMBackend *s) | |
166 | { | |
167 | TPMInfo *info = g_new0(TPMInfo, 1); | |
168 | TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); | |
169 | TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif); | |
170 | ||
171 | info->id = g_strdup(s->id); | |
172 | info->model = tic->model; | |
173 | info->options = k->get_tpm_options(s); | |
174 | ||
175 | return info; | |
176 | } | |
177 | ||
178 | static void tpm_backend_instance_finalize(Object *obj) | |
179 | { | |
180 | TPMBackend *s = TPM_BACKEND(obj); | |
181 | ||
182 | object_unref(OBJECT(s->tpmif)); | |
183 | g_free(s->id); | |
184 | } | |
185 | ||
186 | static const TypeInfo tpm_backend_info = { | |
187 | .name = TYPE_TPM_BACKEND, | |
188 | .parent = TYPE_OBJECT, | |
189 | .instance_size = sizeof(TPMBackend), | |
190 | .instance_finalize = tpm_backend_instance_finalize, | |
191 | .class_size = sizeof(TPMBackendClass), | |
192 | .abstract = true, | |
193 | }; | |
194 | ||
195 | static const TypeInfo tpm_if_info = { | |
196 | .name = TYPE_TPM_IF, | |
197 | .parent = TYPE_INTERFACE, | |
198 | .class_size = sizeof(TPMIfClass), | |
199 | }; | |
200 | ||
201 | static void register_types(void) | |
202 | { | |
203 | type_register_static(&tpm_backend_info); | |
204 | type_register_static(&tpm_if_info); | |
205 | } | |
206 | ||
207 | type_init(register_types); |