Support for TPM command line options

This patch adds support for TPM command line options.
The command line options supported here are

./qemu-... -tpmdev passthrough,path=<path to TPM device>,id=<id>
           -device tpm-tis,tpmdev=<id>,id=<other id>

and

./qemu-... -tpmdev help

where the latter works similar to -soundhw help and shows a list of
available TPM backends (for example 'passthrough').

Using the type parameter, the backend is chosen, i.e., 'passthrough' for the
passthrough driver. The interpretation of the other parameters along
with determining whether enough parameters were provided is pushed into
the backend driver, which needs to implement the interface function
'create' and return a TPMDriverOpts structure if the VM can be started or
'NULL' if not enough or bad parameters were provided.

Monitor support for 'info tpm' has been added. It for example prints the
following:

(qemu) info tpm
TPM devices:
 tpm0: model=tpm-tis
  \ tpm0: type=passthrough,path=/dev/tpm0,cancel-path=/sys/devices/pnp0/00:09/cancel

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com>
Message-id: 1361987275-26289-2-git-send-email-stefanb@linux.vnet.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 343 insertions, 0 deletions

diff --git a/tpm/tpm.c b/tpm/tpm.c
new file mode 100644
index 0000000000..02735493c5
--- /dev/null
+++ b/tpm/tpm.c
@@ -0,0 +1,343 @@
+/*
+ * 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 "monitor/monitor.h"
+#include "qapi/qmp/qerror.h"
+#include "tpm_int.h"
+#include "tpm/tpm.h"
+#include "qemu/config-file.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] = {
+    -1,
+};
+
+int tpm_register_model(enum TpmModel model)
+{
+    int i;
+
+    for (i = 0; i < TPM_MAX_MODELS; i++) {
+        if (tpm_models[i] == -1) {
+            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.
+ */
+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;
+
+    if (!QLIST_EMPTY(&tpm_backends)) {
+        error_report("Only one TPM is allowed.\n");
+        return 1;
+    }
+
+    id = qemu_opts_id(opts);
+    if (id == NULL) {
+        qerror_report(QERR_MISSING_PARAMETER, "id");
+        return 1;
+    }
+
+    value = qemu_opt_get(opts, "type");
+    if (!value) {
+        qerror_report(QERR_MISSING_PARAMETER, "type");
+        tpm_display_backend_drivers();
+        return 1;
+    }
+
+    be = tpm_get_backend_driver(value);
+    if (be == NULL) {
+        qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
+                      "a TPM backend type");
+        tpm_display_backend_drivers();
+        return 1;
+    }
+
+    drv = be->create(opts, id);
+    if (!drv) {
+        return 1;
+    }
+
+    QLIST_INSERT_HEAD(&tpm_backends, drv, list);
+
+    return 0;
+}
+
+static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
+{
+    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);
+        drv->ops->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, 1) != 0) {
+        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(opts_list, optarg, 1);
+    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->type = drv->ops->type;
+    res->tpm_options = g_new0(TpmTypeOptions, 1);
+
+    switch (res->type) {
+    case TPM_TYPE_PASSTHROUGH:
+        res->tpm_options->kind = TPM_TYPE_OPTIONS_KIND_TPM_PASSTHROUGH_OPTIONS;
+        tpo = g_new0(TPMPassthroughOptions, 1);
+        res->tpm_options->tpm_passthrough_options = 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;
+}