qemu/tpm.c

356 lines
7.5 KiB
C

/*
* 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 "config-host.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"
#include "qmp-commands.h"
static QLIST_HEAD(, TPMBackend) tpm_backends =
QLIST_HEAD_INITIALIZER(tpm_backends);
#define TPM_MAX_MODELS 1
#define TPM_MAX_DRIVERS 1
static TPMDriverOps const *be_drivers[TPM_MAX_DRIVERS] = {
NULL,
};
static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
TPM_MODEL_MAX,
};
int tpm_register_model(enum TpmModel model)
{
int i;
for (i = 0; i < TPM_MAX_MODELS; i++) {
if (tpm_models[i] == TPM_MODEL_MAX) {
tpm_models[i] = model;
return 0;
}
}
error_report("Could not register TPM model");
return 1;
}
static bool tpm_model_is_registered(enum TpmModel model)
{
int i;
for (i = 0; i < TPM_MAX_MODELS; i++) {
if (tpm_models[i] == model) {
return true;
}
}
return false;
}
const TPMDriverOps *tpm_get_backend_driver(const char *type)
{
int i;
for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
if (!strcmp(TpmType_lookup[be_drivers[i]->type], type)) {
return be_drivers[i];
}
}
return NULL;
}
#ifdef CONFIG_TPM
int tpm_register_driver(const TPMDriverOps *tdo)
{
int i;
for (i = 0; i < TPM_MAX_DRIVERS; i++) {
if (!be_drivers[i]) {
be_drivers[i] = tdo;
return 0;
}
}
error_report("Could not register TPM driver");
return 1;
}
/*
* Walk the list of available TPM backend drivers and display them on the
* screen.
*/
static void tpm_display_backend_drivers(void)
{
int i;
fprintf(stderr, "Supported TPM types (choose only one):\n");
for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
fprintf(stderr, "%12s %s\n",
TpmType_lookup[be_drivers[i]->type], be_drivers[i]->desc());
}
fprintf(stderr, "\n");
}
/*
* Find the TPM with the given Id
*/
TPMBackend *qemu_find_tpm(const char *id)
{
TPMBackend *drv;
if (id) {
QLIST_FOREACH(drv, &tpm_backends, list) {
if (!strcmp(drv->id, id)) {
return drv;
}
}
}
return NULL;
}
static int configure_tpm(QemuOpts *opts)
{
const char *value;
const char *id;
const TPMDriverOps *be;
TPMBackend *drv;
Error *local_err = NULL;
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;
}
be = tpm_get_backend_driver(value);
if (be == NULL) {
error_report(QERR_INVALID_PARAMETER_VALUE,
"type", "a TPM backend type");
tpm_display_backend_drivers();
return 1;
}
/* validate backend specific opts */
qemu_opts_validate(opts, be->opts, &local_err);
if (local_err) {
error_report_err(local_err);
return 1;
}
drv = be->create(opts, id);
if (!drv) {
return 1;
}
tpm_backend_open(drv, &local_err);
if (local_err) {
error_report_err(local_err);
return 1;
}
QLIST_INSERT_HEAD(&tpm_backends, drv, list);
return 0;
}
static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
{
return configure_tpm(opts);
}
/*
* 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);
tpm_backend_destroy(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;
}
atexit(tpm_cleanup);
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;
}
#endif /* CONFIG_TPM */
static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
{
int i;
for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
if (be_drivers[i]->type == type) {
return be_drivers[i];
}
}
return NULL;
}
static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
{
TPMInfo *res = g_new0(TPMInfo, 1);
TPMPassthroughOptions *tpo;
res->id = g_strdup(drv->id);
res->model = drv->fe_model;
res->options = g_new0(TpmTypeOptions, 1);
switch (drv->ops->type) {
case TPM_TYPE_PASSTHROUGH:
res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
tpo = g_new0(TPMPassthroughOptions, 1);
res->options->passthrough = tpo;
if (drv->path) {
tpo->path = g_strdup(drv->path);
tpo->has_path = true;
}
if (drv->cancel_path) {
tpo->cancel_path = g_strdup(drv->cancel_path);
tpo->has_cancel_path = true;
}
break;
case TPM_TYPE_MAX:
break;
}
return res;
}
/*
* Walk the list of active TPM backends and collect information about them
* following the schema description in qapi-schema.json.
*/
TPMInfoList *qmp_query_tpm(Error **errp)
{
TPMBackend *drv;
TPMInfoList *info, *head = NULL, *cur_item = NULL;
QLIST_FOREACH(drv, &tpm_backends, list) {
if (!tpm_model_is_registered(drv->fe_model)) {
continue;
}
info = g_new0(TPMInfoList, 1);
info->value = qmp_query_tpm_inst(drv);
if (!cur_item) {
head = cur_item = info;
} else {
cur_item->next = info;
cur_item = info;
}
}
return head;
}
TpmTypeList *qmp_query_tpm_types(Error **errp)
{
unsigned int i = 0;
TpmTypeList *head = NULL, *prev = NULL, *cur_item;
for (i = 0; i < TPM_TYPE_MAX; i++) {
if (!tpm_driver_find_by_type(i)) {
continue;
}
cur_item = g_new0(TpmTypeList, 1);
cur_item->value = i;
if (prev) {
prev->next = cur_item;
}
if (!head) {
head = cur_item;
}
prev = cur_item;
}
return head;
}
TpmModelList *qmp_query_tpm_models(Error **errp)
{
unsigned int i = 0;
TpmModelList *head = NULL, *prev = NULL, *cur_item;
for (i = 0; i < TPM_MODEL_MAX; i++) {
if (!tpm_model_is_registered(i)) {
continue;
}
cur_item = g_new0(TpmModelList, 1);
cur_item->value = i;
if (prev) {
prev->next = cur_item;
}
if (!head) {
head = cur_item;
}
prev = cur_item;
}
return head;
}