267 lines
5.7 KiB
C
267 lines
5.7 KiB
C
/*
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* TPM configuration
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*
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* Copyright (C) 2011-2013 IBM Corporation
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*
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* Authors:
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* Stefan Berger <stefanb@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* Based on net.c
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*/
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#include "qemu/osdep.h"
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#include "qapi/qmp/qerror.h"
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#include "sysemu/tpm_backend.h"
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#include "sysemu/tpm.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qmp-commands.h"
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static QLIST_HEAD(, TPMBackend) tpm_backends =
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QLIST_HEAD_INITIALIZER(tpm_backends);
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static bool tpm_models[TPM_MODEL__MAX];
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void tpm_register_model(enum TpmModel model)
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{
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tpm_models[model] = true;
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}
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static const TPMBackendClass *
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tpm_be_find_by_type(enum TpmType type)
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{
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ObjectClass *oc;
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char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));
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oc = object_class_by_name(typename);
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g_free(typename);
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if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
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return NULL;
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}
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return TPM_BACKEND_CLASS(oc);
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}
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/*
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* Walk the list of available TPM backend drivers and display them on the
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* screen.
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*/
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static void tpm_display_backend_drivers(void)
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{
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int i;
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fprintf(stderr, "Supported TPM types (choose only one):\n");
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for (i = 0; i < TPM_TYPE__MAX; i++) {
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const TPMBackendClass *bc = tpm_be_find_by_type(i);
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if (!bc) {
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continue;
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}
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fprintf(stderr, "%12s %s\n", TpmType_str(i), bc->desc);
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}
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fprintf(stderr, "\n");
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}
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/*
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* Find the TPM with the given Id
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*/
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TPMBackend *qemu_find_tpm(const char *id)
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{
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TPMBackend *drv;
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if (id) {
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QLIST_FOREACH(drv, &tpm_backends, list) {
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if (!strcmp(drv->id, id)) {
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return drv;
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}
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}
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}
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return NULL;
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}
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static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
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{
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const char *value;
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const char *id;
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const TPMBackendClass *be;
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TPMBackend *drv;
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Error *local_err = NULL;
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int i;
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if (!QLIST_EMPTY(&tpm_backends)) {
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error_report("Only one TPM is allowed.");
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return 1;
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}
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id = qemu_opts_id(opts);
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if (id == NULL) {
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error_report(QERR_MISSING_PARAMETER, "id");
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return 1;
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}
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value = qemu_opt_get(opts, "type");
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if (!value) {
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error_report(QERR_MISSING_PARAMETER, "type");
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tpm_display_backend_drivers();
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return 1;
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}
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i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
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be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
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if (be == NULL) {
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error_report(QERR_INVALID_PARAMETER_VALUE,
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"type", "a TPM backend type");
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tpm_display_backend_drivers();
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return 1;
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}
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/* validate backend specific opts */
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qemu_opts_validate(opts, be->opts, &local_err);
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if (local_err) {
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error_report_err(local_err);
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return 1;
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}
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drv = be->create(opts, id);
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if (!drv) {
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return 1;
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}
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tpm_backend_open(drv, &local_err);
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if (local_err) {
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error_report_err(local_err);
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return 1;
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}
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QLIST_INSERT_HEAD(&tpm_backends, drv, list);
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return 0;
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}
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/*
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* Walk the list of TPM backend drivers that are in use and call their
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* destroy function to have them cleaned up.
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*/
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void tpm_cleanup(void)
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{
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TPMBackend *drv, *next;
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QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
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QLIST_REMOVE(drv, list);
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object_unref(OBJECT(drv));
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}
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}
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/*
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* Initialize the TPM. Process the tpmdev command line options describing the
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* TPM backend.
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*/
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int tpm_init(void)
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{
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if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
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tpm_init_tpmdev, NULL, NULL)) {
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return -1;
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}
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return 0;
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}
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/*
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* Parse the TPM configuration options.
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* To display all available TPM backends the user may use '-tpmdev help'
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*/
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int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
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{
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QemuOpts *opts;
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if (!strcmp(optarg, "help")) {
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tpm_display_backend_drivers();
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return -1;
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}
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opts = qemu_opts_parse_noisily(opts_list, optarg, true);
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if (!opts) {
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return -1;
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}
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return 0;
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}
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/*
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* Walk the list of active TPM backends and collect information about them
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* following the schema description in qapi-schema.json.
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*/
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TPMInfoList *qmp_query_tpm(Error **errp)
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{
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TPMBackend *drv;
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TPMInfoList *info, *head = NULL, *cur_item = NULL;
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QLIST_FOREACH(drv, &tpm_backends, list) {
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if (!tpm_models[drv->fe_model]) {
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continue;
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}
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info = g_new0(TPMInfoList, 1);
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info->value = tpm_backend_query_tpm(drv);
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if (!cur_item) {
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head = cur_item = info;
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} else {
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cur_item->next = info;
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cur_item = info;
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}
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}
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return head;
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}
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TpmTypeList *qmp_query_tpm_types(Error **errp)
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{
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unsigned int i = 0;
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TpmTypeList *head = NULL, *prev = NULL, *cur_item;
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for (i = 0; i < TPM_TYPE__MAX; i++) {
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if (!tpm_be_find_by_type(i)) {
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continue;
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}
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cur_item = g_new0(TpmTypeList, 1);
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cur_item->value = i;
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if (prev) {
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prev->next = cur_item;
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}
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if (!head) {
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head = cur_item;
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}
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prev = cur_item;
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}
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return head;
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}
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TpmModelList *qmp_query_tpm_models(Error **errp)
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{
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unsigned int i = 0;
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TpmModelList *head = NULL, *prev = NULL, *cur_item;
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for (i = 0; i < TPM_MODEL__MAX; i++) {
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if (!tpm_models[i]) {
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continue;
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}
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cur_item = g_new0(TpmModelList, 1);
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cur_item->value = i;
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if (prev) {
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prev->next = cur_item;
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}
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if (!head) {
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head = cur_item;
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}
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prev = cur_item;
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}
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return head;
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}
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