qemu

tpm.c (5396B)

---

 /*
  * TPM configuration
  *
  * Copyright (C) 2011-2013 IBM Corporation
  *
  * 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 net.c
  */
 
 #include "qemu/osdep.h"
 
 #include "qapi/error.h"
 #include "qapi/qapi-commands-tpm.h"
 #include "qapi/qmp/qerror.h"
 #include "sysemu/tpm_backend.h"
 #include "sysemu/tpm.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 
 static QLIST_HEAD(, TPMBackend) tpm_backends =
     QLIST_HEAD_INITIALIZER(tpm_backends);
 
 static const TPMBackendClass *
 tpm_be_find_by_type(enum TpmType type)
 {
     ObjectClass *oc;
     char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));
 
     oc = object_class_by_name(typename);
     g_free(typename);
 
     if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
         return NULL;
     }
 
     return TPM_BACKEND_CLASS(oc);
 }
 
 /*
  * Walk the list of available TPM backend drivers and display them on the
  * screen.
  */
 static void tpm_display_backend_drivers(void)
 {
     bool got_one = false;
     int i;
 
     for (i = 0; i < TPM_TYPE__MAX; i++) {
         const TPMBackendClass *bc = tpm_be_find_by_type(i);
         if (!bc) {
             continue;
         }
         if (!got_one) {
             error_printf("Supported TPM types (choose only one):\n");
             got_one = true;
         }
         error_printf("%12s   %s\n", TpmType_str(i), bc->desc);
     }
     if (!got_one) {
         error_printf("No TPM backend types are available\n");
     }
 }
 
 /*
  * Find the TPM with the given Id
  */
 TPMBackend *qemu_find_tpm_be(const char *id)
 {
     TPMBackend *drv;
 
     if (id) {
         QLIST_FOREACH(drv, &tpm_backends, list) {
             if (!strcmp(drv->id, id)) {
                 return drv;
             }
         }
     }
 
     return NULL;
 }
 
 static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
 {
     /*
      * Use of error_report() in a function with an Error ** parameter
      * is suspicious.  It is okay here.  The parameter only exists to
      * make the function usable with qemu_opts_foreach().  It is not
      * actually used.
      */
     const char *value;
     const char *id;
     const TPMBackendClass *be;
     TPMBackend *drv;
     Error *local_err = NULL;
     int i;
 
     if (!QLIST_EMPTY(&tpm_backends)) {
         error_report("Only one TPM is allowed.");
         return 1;
     }
 
     id = qemu_opts_id(opts);
     if (id == NULL) {
         error_report(QERR_MISSING_PARAMETER, "id");
         return 1;
     }
 
     value = qemu_opt_get(opts, "type");
     if (!value) {
         error_report(QERR_MISSING_PARAMETER, "type");
         tpm_display_backend_drivers();
         return 1;
     }
 
     i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
     be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
     if (be == NULL) {
         error_report(QERR_INVALID_PARAMETER_VALUE,
                      "type", "a TPM backend type");
         tpm_display_backend_drivers();
         return 1;
     }
 
     /* validate backend specific opts */
     if (!qemu_opts_validate(opts, be->opts, &local_err)) {
         error_report_err(local_err);
         return 1;
     }
 
     drv = be->create(opts);
     if (!drv) {
         return 1;
     }
 
     drv->id = g_strdup(id);
     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 
     return 0;
 }
 
 /*
  * Walk the list of TPM backend drivers that are in use and call their
  * destroy function to have them cleaned up.
  */
 void tpm_cleanup(void)
 {
     TPMBackend *drv, *next;
 
     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
         QLIST_REMOVE(drv, list);
         object_unref(OBJECT(drv));
     }
 }
 
 /*
  * Initialize the TPM. Process the tpmdev command line options describing the
  * TPM backend.
  */
 int tpm_init(void)
 {
     if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
                           tpm_init_tpmdev, NULL, NULL)) {
         return -1;
     }
 
     return 0;
 }
 
 /*
  * Parse the TPM configuration options.
  * To display all available TPM backends the user may use '-tpmdev help'
  */
 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 {
     QemuOpts *opts;
 
     if (!strcmp(optarg, "help")) {
         tpm_display_backend_drivers();
         return -1;
     }
     opts = qemu_opts_parse_noisily(opts_list, optarg, true);
     if (!opts) {
         return -1;
     }
     return 0;
 }
 
 /*
  * Walk the list of active TPM backends and collect information about them.
  */
 TPMInfoList *qmp_query_tpm(Error **errp)
 {
     TPMBackend *drv;
     TPMInfoList *head = NULL, **tail = &head;
 
     QLIST_FOREACH(drv, &tpm_backends, list) {
         if (!drv->tpmif) {
             continue;
         }
 
         QAPI_LIST_APPEND(tail, tpm_backend_query_tpm(drv));
     }
 
     return head;
 }
 
 TpmTypeList *qmp_query_tpm_types(Error **errp)
 {
     unsigned int i = 0;
     TpmTypeList *head = NULL, **tail = &head;
 
     for (i = 0; i < TPM_TYPE__MAX; i++) {
         if (!tpm_be_find_by_type(i)) {
             continue;
         }
         QAPI_LIST_APPEND(tail, i);
     }
 
     return head;
 }
 TpmModelList *qmp_query_tpm_models(Error **errp)
 {
     TpmModelList *head = NULL, **tail = &head;
     GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);
 
     for (e = l; e; e = e->next) {
         TPMIfClass *c = TPM_IF_CLASS(e->data);
 
         QAPI_LIST_APPEND(tail, c->model);
     }
     g_slist_free(l);
 
     return head;
 }