qemu

tpm_backend.c (4593B)

---

 /*
  * QEMU TPM Backend
  *
  * Copyright IBM, Corp. 2013
  *
  * Authors:
  *  Stefan Berger   <stefanb@us.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  *
  * Based on backends/rng.c by Anthony Liguori
  */
 
 #include "qemu/osdep.h"
 #include "sysemu/tpm_backend.h"
 #include "qapi/error.h"
 #include "sysemu/tpm.h"
 #include "qemu/thread.h"
 #include "qemu/main-loop.h"
 #include "qemu/module.h"
 #include "block/thread-pool.h"
 #include "qemu/error-report.h"
 
 static void tpm_backend_request_completed(void *opaque, int ret)
 {
     TPMBackend *s = TPM_BACKEND(opaque);
     TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
 
     tic->request_completed(s->tpmif, ret);
 
     /* no need for atomic, as long the BQL is taken */
     s->cmd = NULL;
     object_unref(OBJECT(s));
 }
 
 static int tpm_backend_worker_thread(gpointer data)
 {
     TPMBackend *s = TPM_BACKEND(data);
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
     Error *err = NULL;
 
     k->handle_request(s, s->cmd, &err);
     if (err) {
         error_report_err(err);
         return -1;
     }
 
     return 0;
 }
 
 void tpm_backend_finish_sync(TPMBackend *s)
 {
     while (s->cmd) {
         aio_poll(qemu_get_aio_context(), true);
     }
 }
 
 enum TpmType tpm_backend_get_type(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     return k->type;
 }
 
 int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp)
 {
     if (s->tpmif) {
         error_setg(errp, "TPM backend '%s' is already initialized", s->id);
         return -1;
     }
 
     s->tpmif = tpmif;
     object_ref(OBJECT(tpmif));
 
     s->had_startup_error = false;
 
     return 0;
 }
 
 int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize)
 {
     int res = 0;
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     /* terminate a running TPM */
     tpm_backend_finish_sync(s);
 
     res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0;
 
     s->had_startup_error = (res != 0);
 
     return res;
 }
 
 bool tpm_backend_had_startup_error(TPMBackend *s)
 {
     return s->had_startup_error;
 }
 
 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd)
 {
     ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
 
     if (s->cmd != NULL) {
         error_report("There is a TPM request pending");
         return;
     }
 
     s->cmd = cmd;
     object_ref(OBJECT(s));
     thread_pool_submit_aio(pool, tpm_backend_worker_thread, s,
                            tpm_backend_request_completed, s);
 }
 
 void tpm_backend_reset(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     if (k->reset) {
         k->reset(s);
     }
 
     tpm_backend_finish_sync(s);
 
     s->had_startup_error = false;
 }
 
 void tpm_backend_cancel_cmd(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     k->cancel_cmd(s);
 }
 
 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     return k->get_tpm_established_flag ?
            k->get_tpm_established_flag(s) : false;
 }
 
 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     return k->reset_tpm_established_flag ?
            k->reset_tpm_established_flag(s, locty) : 0;
 }
 
 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     return k->get_tpm_version(s);
 }
 
 size_t tpm_backend_get_buffer_size(TPMBackend *s)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 
     return k->get_buffer_size(s);
 }
 
 TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
 {
     TPMInfo *info = g_new0(TPMInfo, 1);
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
     TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
 
     info->id = g_strdup(s->id);
     info->model = tic->model;
     info->options = k->get_tpm_options(s);
 
     return info;
 }
 
 static void tpm_backend_instance_finalize(Object *obj)
 {
     TPMBackend *s = TPM_BACKEND(obj);
 
     object_unref(OBJECT(s->tpmif));
     g_free(s->id);
 }
 
 static const TypeInfo tpm_backend_info = {
     .name = TYPE_TPM_BACKEND,
     .parent = TYPE_OBJECT,
     .instance_size = sizeof(TPMBackend),
     .instance_finalize = tpm_backend_instance_finalize,
     .class_size = sizeof(TPMBackendClass),
     .abstract = true,
 };
 
 static const TypeInfo tpm_if_info = {
     .name = TYPE_TPM_IF,
     .parent = TYPE_INTERFACE,
     .class_size = sizeof(TPMIfClass),
 };
 
 static void register_types(void)
 {
     type_register_static(&tpm_backend_info);
     type_register_static(&tpm_if_info);
 }
 
 type_init(register_types);