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/*
* 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;
}
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