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/*
* 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 "qapi/qmp/qerror.h"
#include "sysemu/tpm.h"
#include "qemu/thread.h"
static void tpm_backend_worker_thread(gpointer data, gpointer user_data)
{
TPMBackend *s = TPM_BACKEND(user_data);
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
assert(k->handle_request != NULL);
k->handle_request(s, (TPMBackendCmd)data);
}
static void tpm_backend_thread_end(TPMBackend *s)
{
if (s->thread_pool) {
g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_END, NULL);
g_thread_pool_free(s->thread_pool, FALSE, TRUE);
s->thread_pool = NULL;
}
}
enum TpmType tpm_backend_get_type(TPMBackend *s)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
return k->ops->type;
}
int tpm_backend_init(TPMBackend *s, TPMState *state,
TPMRecvDataCB *datacb)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
s->tpm_state = state;
s->recv_data_callback = datacb;
s->had_startup_error = false;
return k->ops->init ? k->ops->init(s) : 0;
}
int tpm_backend_startup_tpm(TPMBackend *s)
{
int res = 0;
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
/* terminate a running TPM */
tpm_backend_thread_end(s);
s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE,
NULL);
g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
res = k->ops->startup_tpm ? k->ops->startup_tpm(s) : 0;
s->had_startup_error = (res != 0);
return res;
}
bool tpm_backend_had_startup_error(TPMBackend *s)
{
return s->had_startup_error;
}
size_t tpm_backend_realloc_buffer(TPMBackend *s, TPMSizedBuffer *sb)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
assert(k->ops->realloc_buffer);
return k->ops->realloc_buffer(sb);
}
void tpm_backend_deliver_request(TPMBackend *s)
{
g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD,
NULL);
}
void tpm_backend_reset(TPMBackend *s)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
if (k->ops->reset) {
k->ops->reset(s);
}
tpm_backend_thread_end(s);
s->had_startup_error = false;
}
void tpm_backend_cancel_cmd(TPMBackend *s)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
assert(k->ops->cancel_cmd);
k->ops->cancel_cmd(s);
}
bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
return k->ops->get_tpm_established_flag ?
k->ops->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->ops->reset_tpm_established_flag ?
k->ops->reset_tpm_established_flag(s, locty) : 0;
}
TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
{
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
assert(k->ops->get_tpm_version);
return k->ops->get_tpm_version(s);
}
static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
{
TPMBackend *s = TPM_BACKEND(obj);
return s->opened;
}
void tpm_backend_open(TPMBackend *s, Error **errp)
{
object_property_set_bool(OBJECT(s), true, "opened", errp);
}
static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp)
{
TPMBackend *s = TPM_BACKEND(obj);
TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
Error *local_err = NULL;
if (value == s->opened) {
return;
}
if (!value && s->opened) {
error_setg(errp, QERR_PERMISSION_DENIED);
return;
}
if (k->opened) {
k->opened(s, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
s->opened = true;
}
static void tpm_backend_instance_init(Object *obj)
{
TPMBackend *s = TPM_BACKEND(obj);
object_property_add_bool(obj, "opened",
tpm_backend_prop_get_opened,
tpm_backend_prop_set_opened,
NULL);
s->fe_model = -1;
}
static void tpm_backend_instance_finalize(Object *obj)
{
TPMBackend *s = TPM_BACKEND(obj);
g_free(s->id);
g_free(s->path);
g_free(s->cancel_path);
tpm_backend_thread_end(s);
}
static const TypeInfo tpm_backend_info = {
.name = TYPE_TPM_BACKEND,
.parent = TYPE_OBJECT,
.instance_size = sizeof(TPMBackend),
.instance_init = tpm_backend_instance_init,
.instance_finalize = tpm_backend_instance_finalize,
.class_size = sizeof(TPMBackendClass),
.abstract = true,
};
static void register_types(void)
{
type_register_static(&tpm_backend_info);
}
type_init(register_types);
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