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![Peter Maydell](/assets/img/avatar_default.png)
The TpmModel type is an enum (valid values 0 and 1), which means the compiler can legitimately decide that comparisons like 'tpm_models[i] == -1' are never true. (For example it could pick 'unsigned char' as its type for representing the enum.) Avoid this issue by using TPM_MODEL_MAX to mark entries in the tpm_models[] array which aren't filled in, instead of -1. This silences a clang warning: tpm.c:43:27: error: comparison of constant -1 with expression of type 'enum TpmModel' is always false [-Werror,-Wtautological-constant-out-of-range-compare] if (tpm_models[i] == -1) { ~~~~~~~~~~~~~ ^ ~~ Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1375096931-13842-1-git-send-email-peter.maydell@linaro.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
359 lines
7.6 KiB
C
359 lines
7.6 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 "config-host.h"
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#include "monitor/monitor.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 "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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#define TPM_MAX_MODELS 1
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#define TPM_MAX_DRIVERS 1
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static TPMDriverOps const *be_drivers[TPM_MAX_DRIVERS] = {
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NULL,
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};
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static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
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TPM_MODEL_MAX,
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};
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int tpm_register_model(enum TpmModel model)
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{
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int i;
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for (i = 0; i < TPM_MAX_MODELS; i++) {
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if (tpm_models[i] == TPM_MODEL_MAX) {
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tpm_models[i] = model;
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return 0;
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}
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}
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error_report("Could not register TPM model");
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return 1;
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}
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static bool tpm_model_is_registered(enum TpmModel model)
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{
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int i;
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for (i = 0; i < TPM_MAX_MODELS; i++) {
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if (tpm_models[i] == model) {
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return true;
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}
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}
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return false;
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}
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const TPMDriverOps *tpm_get_backend_driver(const char *type)
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{
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int i;
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for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
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if (!strcmp(TpmType_lookup[be_drivers[i]->type], type)) {
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return be_drivers[i];
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}
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}
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return NULL;
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}
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#ifdef CONFIG_TPM
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int tpm_register_driver(const TPMDriverOps *tdo)
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{
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int i;
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for (i = 0; i < TPM_MAX_DRIVERS; i++) {
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if (!be_drivers[i]) {
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be_drivers[i] = tdo;
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return 0;
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}
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}
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error_report("Could not register TPM driver");
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return 1;
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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_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
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fprintf(stderr, "%12s %s\n",
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TpmType_lookup[be_drivers[i]->type], be_drivers[i]->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 configure_tpm(QemuOpts *opts)
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{
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const char *value;
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const char *id;
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const TPMDriverOps *be;
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TPMBackend *drv;
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Error *local_err = NULL;
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if (!QLIST_EMPTY(&tpm_backends)) {
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error_report("Only one TPM is allowed.\n");
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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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qerror_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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qerror_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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be = tpm_get_backend_driver(value);
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if (be == NULL) {
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qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
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"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 (error_is_set(&local_err)) {
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qerror_report_err(local_err);
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error_free(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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qerror_report_err(local_err);
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error_free(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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static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
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{
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return configure_tpm(opts);
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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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tpm_backend_destroy(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, 1) != 0) {
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return -1;
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}
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atexit(tpm_cleanup);
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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(opts_list, optarg, 1);
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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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#endif /* CONFIG_TPM */
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static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
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{
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int i;
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for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
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if (be_drivers[i]->type == type) {
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return be_drivers[i];
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}
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}
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return NULL;
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}
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static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
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{
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TPMInfo *res = g_new0(TPMInfo, 1);
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TPMPassthroughOptions *tpo;
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res->id = g_strdup(drv->id);
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res->model = drv->fe_model;
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res->options = g_new0(TpmTypeOptions, 1);
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switch (drv->ops->type) {
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case TPM_TYPE_PASSTHROUGH:
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res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
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tpo = g_new0(TPMPassthroughOptions, 1);
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res->options->passthrough = tpo;
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if (drv->path) {
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tpo->path = g_strdup(drv->path);
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tpo->has_path = true;
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}
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if (drv->cancel_path) {
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tpo->cancel_path = g_strdup(drv->cancel_path);
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tpo->has_cancel_path = true;
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}
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break;
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case TPM_TYPE_MAX:
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break;
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}
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return res;
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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_model_is_registered(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 = qmp_query_tpm_inst(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_driver_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_model_is_registered(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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