207 lines
4.4 KiB
C
207 lines
4.4 KiB
C
/*
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* QEMU TPM Backend
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*
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* Copyright IBM, Corp. 2013
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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 backends/rng.c by Anthony Liguori
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*/
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#include "qemu/osdep.h"
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#include "sysemu/tpm_backend.h"
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#include "qapi/error.h"
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#include "sysemu/tpm.h"
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#include "qemu/thread.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "block/thread-pool.h"
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#include "qemu/error-report.h"
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static void tpm_backend_request_completed(void *opaque, int ret)
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{
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TPMBackend *s = TPM_BACKEND(opaque);
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TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
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tic->request_completed(s->tpmif, ret);
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/* no need for atomic, as long the BQL is taken */
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s->cmd = NULL;
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object_unref(OBJECT(s));
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}
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static int tpm_backend_worker_thread(gpointer data)
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{
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TPMBackend *s = TPM_BACKEND(data);
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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Error *err = NULL;
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k->handle_request(s, s->cmd, &err);
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if (err) {
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error_report_err(err);
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return -1;
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}
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return 0;
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}
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void tpm_backend_finish_sync(TPMBackend *s)
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{
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while (s->cmd) {
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aio_poll(qemu_get_aio_context(), true);
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}
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}
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enum TpmType tpm_backend_get_type(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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return k->type;
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}
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int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp)
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{
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if (s->tpmif) {
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error_setg(errp, "TPM backend '%s' is already initialized", s->id);
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return -1;
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}
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s->tpmif = tpmif;
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object_ref(OBJECT(tpmif));
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s->had_startup_error = false;
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return 0;
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}
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int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize)
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{
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int res = 0;
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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/* terminate a running TPM */
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tpm_backend_finish_sync(s);
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res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0;
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s->had_startup_error = (res != 0);
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return res;
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}
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bool tpm_backend_had_startup_error(TPMBackend *s)
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{
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return s->had_startup_error;
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}
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void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd)
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{
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if (s->cmd != NULL) {
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error_report("There is a TPM request pending");
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return;
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}
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s->cmd = cmd;
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object_ref(OBJECT(s));
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thread_pool_submit_aio(tpm_backend_worker_thread, s,
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tpm_backend_request_completed, s);
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}
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void tpm_backend_reset(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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if (k->reset) {
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k->reset(s);
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}
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tpm_backend_finish_sync(s);
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s->had_startup_error = false;
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}
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void tpm_backend_cancel_cmd(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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k->cancel_cmd(s);
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}
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bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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return k->get_tpm_established_flag ?
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k->get_tpm_established_flag(s) : false;
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}
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int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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return k->reset_tpm_established_flag ?
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k->reset_tpm_established_flag(s, locty) : 0;
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}
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TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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return k->get_tpm_version(s);
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}
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size_t tpm_backend_get_buffer_size(TPMBackend *s)
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{
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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return k->get_buffer_size(s);
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}
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TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
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{
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TPMInfo *info = g_new0(TPMInfo, 1);
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TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
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TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
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info->id = g_strdup(s->id);
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info->model = tic->model;
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info->options = k->get_tpm_options(s);
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return info;
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}
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static void tpm_backend_instance_finalize(Object *obj)
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{
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TPMBackend *s = TPM_BACKEND(obj);
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object_unref(OBJECT(s->tpmif));
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g_free(s->id);
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}
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static const TypeInfo tpm_backend_info = {
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.name = TYPE_TPM_BACKEND,
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.parent = TYPE_OBJECT,
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.instance_size = sizeof(TPMBackend),
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.instance_finalize = tpm_backend_instance_finalize,
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.class_size = sizeof(TPMBackendClass),
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.abstract = true,
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};
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static const TypeInfo tpm_if_info = {
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.name = TYPE_TPM_IF,
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.parent = TYPE_INTERFACE,
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.class_size = sizeof(TPMIfClass),
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};
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static void register_types(void)
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{
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type_register_static(&tpm_backend_info);
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type_register_static(&tpm_if_info);
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}
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type_init(register_types);
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