Merge remote-tracking branch 'remotes/stefanberger/tags/pull-tpm-2020-07-24-1' into staging

Merge tpm 2020/07/24 v1

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# gpg:                using RSA key B818B9CADF9089C2D5CEC66B75AD65802A0B4211
# gpg: Good signature from "Stefan Berger <stefanb@linux.vnet.ibm.com>" [unknown]
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* remotes/stefanberger/tags/pull-tpm-2020-07-24-1:
  tpm_emulator: Report an error if chardev is missing
  tpm: Improve help on TPM types when none are available
  Revert "tpm: Clean up error reporting in tpm_init_tpmdev()"
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

backends/tpm/tpm_emulator.c

@@ -549,27 +549,30 @@ err_exit:
 static int tpm_emulator_handle_device_opts(TPMEmulator *tpm_emu, QemuOpts *opts)
 {
     const char *value;
+    Error *err = NULL;
+    Chardev *dev;
 
     value = qemu_opt_get(opts, "chardev");
-    if (value) {
-        Error *err = NULL;
-        Chardev *dev = qemu_chr_find(value);
-
-        if (!dev) {
-            error_report("tpm-emulator: tpm chardev '%s' not found.", value);
-            goto err;
-        }
+    if (!value) {
+        error_report("tpm-emulator: parameter 'chardev' is missing");
+        goto err;
+    }
 
-        if (!qemu_chr_fe_init(&tpm_emu->ctrl_chr, dev, &err)) {
-            error_prepend(&err, "tpm-emulator: No valid chardev found at '%s':",
-                          value);
-            error_report_err(err);
-            goto err;
-        }
+    dev = qemu_chr_find(value);
+    if (!dev) {
+        error_report("tpm-emulator: tpm chardev '%s' not found", value);
+        goto err;
+    }
 
-        tpm_emu->options->chardev = g_strdup(value);
+    if (!qemu_chr_fe_init(&tpm_emu->ctrl_chr, dev, &err)) {
+        error_prepend(&err, "tpm-emulator: No valid chardev found at '%s':",
+                      value);
+        error_report_err(err);
+        goto err;
     }
 
+    tpm_emu->options->chardev = g_strdup(value);
+
     if (tpm_emulator_prepare_data_fd(tpm_emu) < 0) {
         goto err;
     }
@@ -925,6 +928,11 @@ static void tpm_emulator_shutdown(TPMEmulator *tpm_emu)
 {
     ptm_res res;
 
+    if (!tpm_emu->options->chardev) {
+        /* was never properly initialized */
+        return;
+    }
+
     if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SHUTDOWN, &res, 0, sizeof(res)) < 0) {
         error_report("tpm-emulator: Could not cleanly shutdown the TPM: %s",
                      strerror(errno));

include/sysemu/tpm.h

@@ -16,7 +16,7 @@
 #include "qom/object.h"
 
 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg);
-void tpm_init(void);
+int tpm_init(void);
 void tpm_cleanup(void);
 
 typedef enum TPMVersion {

softmmu/vl.c

@@ -4258,7 +4258,9 @@ void qemu_init(int argc, char **argv, char **envp)
                       user_creatable_add_opts_foreach,
                       object_create_delayed, &error_fatal);
 
-    tpm_init();
+    if (tpm_init() < 0) {
+        exit(1);
+    }
 
     blk_mig_init();
     ram_mig_init();

stubs/tpm.c

@@ -10,8 +10,9 @@
 #include "sysemu/tpm.h"
 #include "hw/acpi/tpm.h"
 
-void tpm_init(void)
+int tpm_init(void)
 {
+    return 0;
 }
 
 void tpm_cleanup(void)

tpm.c

@@ -47,18 +47,23 @@ tpm_be_find_by_type(enum TpmType type)
  */
 static void tpm_display_backend_drivers(void)
 {
+    bool got_one = false;
     int i;
 
-    fprintf(stderr, "Supported TPM types (choose only one):\n");
-
     for (i = 0; i < TPM_TYPE__MAX; i++) {
         const TPMBackendClass *bc = tpm_be_find_by_type(i);
         if (!bc) {
             continue;
         }
-        fprintf(stderr, "%12s   %s\n", TpmType_str(i), bc->desc);
+        if (!got_one) {
+            error_printf("Supported TPM types (choose only one):\n");
+            got_one = true;
+        }
+        error_printf("%12s   %s\n", TpmType_str(i), bc->desc);
+    }
+    if (!got_one) {
+        error_printf("No TPM backend types are available\n");
     }
-    fprintf(stderr, "\n");
 }
 
 /*
@@ -81,26 +86,33 @@ TPMBackend *qemu_find_tpm_be(const char *id)
 
 static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
 {
+    /*
+     * Use of error_report() in a function with an Error ** parameter
+     * is suspicious.  It is okay here.  The parameter only exists to
+     * make the function usable with qemu_opts_foreach().  It is not
+     * actually used.
+     */
     const char *value;
     const char *id;
     const TPMBackendClass *be;
     TPMBackend *drv;
+    Error *local_err = NULL;
     int i;
 
     if (!QLIST_EMPTY(&tpm_backends)) {
-        error_setg(errp, "Only one TPM is allowed.");
+        error_report("Only one TPM is allowed.");
         return 1;
     }
 
     id = qemu_opts_id(opts);
     if (id == NULL) {
-        error_setg(errp, QERR_MISSING_PARAMETER, "id");
+        error_report(QERR_MISSING_PARAMETER, "id");
         return 1;
     }
 
     value = qemu_opt_get(opts, "type");
     if (!value) {
-        error_setg(errp, QERR_MISSING_PARAMETER, "type");
+        error_report(QERR_MISSING_PARAMETER, "type");
         tpm_display_backend_drivers();
         return 1;
     }
@@ -108,14 +120,15 @@ static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
     i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
     be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
     if (be == NULL) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
-                   "a TPM backend type");
+        error_report(QERR_INVALID_PARAMETER_VALUE,
+                     "type", "a TPM backend type");
         tpm_display_backend_drivers();
         return 1;
     }
 
     /* validate backend specific opts */
-    if (!qemu_opts_validate(opts, be->opts, errp)) {
+    if (!qemu_opts_validate(opts, be->opts, &local_err)) {
+        error_report_err(local_err);
         return 1;
     }
 
@@ -148,10 +161,14 @@ void tpm_cleanup(void)
  * Initialize the TPM. Process the tpmdev command line options describing the
  * TPM backend.
  */
-void tpm_init(void)
+int tpm_init(void)
 {
-    qemu_opts_foreach(qemu_find_opts("tpmdev"),
-                      tpm_init_tpmdev, NULL, &error_fatal);
+    if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
+                          tpm_init_tpmdev, NULL, NULL)) {
+        return -1;
+    }
+
+    return 0;
 }
 
 /*