tests: Use QMP to check whether a TPM device model is available

Use QMP to check whether a given TPM device model is available and if it
is not the case then do not register the tests that require it.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20210802215246.1433175-9-stefanb@linux.ibm.com

tests/qtest/bios-tables-test.c

@@ -1094,7 +1094,6 @@ uint64_t tpm_tis_base_addr;
 static void test_acpi_tcg_tpm(const char *machine, const char *tpm_if,
                               uint64_t base, enum TPMVersion tpm_version)
 {
-#ifdef CONFIG_TPM
     gchar *tmp_dir_name = g_strdup_printf("qemu-test_acpi_%s_tcg_%s.XXXXXX",
                                           machine, tpm_if);
     char *tmp_path = g_dir_make_tmp(tmp_dir_name, NULL);
@@ -1140,9 +1139,6 @@ static void test_acpi_tcg_tpm(const char *machine, const char *tpm_if,
     g_free(tmp_dir_name);
     g_free(args);
     free_test_data(&data);
-#else
-    g_test_skip("TPM disabled");
-#endif
 }
 
 static void test_acpi_q35_tcg_tpm_tis(void)
@@ -1518,7 +1514,9 @@ int main(int argc, char *argv[])
             return ret;
         }
         qtest_add_func("acpi/q35/oem-fields", test_acpi_oem_fields_q35);
-        qtest_add_func("acpi/q35/tpm-tis", test_acpi_q35_tcg_tpm_tis);
+        if (tpm_model_is_available("-machine q35", "tpm-tis")) {
+            qtest_add_func("acpi/q35/tpm2-tis", test_acpi_q35_tcg_tpm_tis);
+        }
         qtest_add_func("acpi/piix4", test_acpi_piix4_tcg);
         qtest_add_func("acpi/oem-fields", test_acpi_oem_fields_pc);
         qtest_add_func("acpi/piix4/bridge", test_acpi_piix4_tcg_bridge);

tests/qtest/tpm-emu.c

@@ -16,6 +16,8 @@
 #include "backends/tpm/tpm_ioctl.h"
 #include "io/channel-socket.h"
 #include "qapi/error.h"
+#include "qapi/qmp/qlist.h"
+#include "qapi/qmp/qstring.h"
 #include "tpm-emu.h"
 
 void tpm_emu_test_wait_cond(TPMTestState *s)
@@ -192,3 +194,39 @@ void *tpm_emu_ctrl_thread(void *data)
     object_unref(OBJECT(lioc));
     return NULL;
 }
+
+bool tpm_model_is_available(const char *args, const char *tpm_if)
+{
+    QTestState *qts;
+    QDict *rsp_tpm;
+    bool ret = false;
+
+    qts = qtest_init(args);
+    if (!qts) {
+        return false;
+    }
+
+    rsp_tpm = qtest_qmp(qts, "{ 'execute': 'query-tpm'}");
+    if (!qdict_haskey(rsp_tpm, "error")) {
+        QDict *rsp_models = qtest_qmp(qts,
+                                      "{ 'execute': 'query-tpm-models'}");
+        if (qdict_haskey(rsp_models, "return")) {
+            QList *models = qdict_get_qlist(rsp_models, "return");
+            QListEntry *e;
+
+            QLIST_FOREACH_ENTRY(models, e) {
+                QString *s = qobject_to(QString, qlist_entry_obj(e));
+                const char *ename = qstring_get_str(s);
+                if (!strcmp(ename, tpm_if)) {
+                    ret = true;
+                    break;
+                }
+            }
+        }
+        qobject_unref(rsp_models);
+    }
+    qobject_unref(rsp_tpm);
+    qtest_quit(qts);
+
+    return ret;
+}

tests/qtest/tpm-emu.h

@@ -22,6 +22,7 @@
 #include "qemu/sockets.h"
 #include "io/channel.h"
 #include "sysemu/tpm.h"
+#include "libqos/libqtest.h"
 
 struct tpm_hdr {
     uint16_t tag;
@@ -50,5 +51,6 @@ typedef struct TPMTestState {
 
 void tpm_emu_test_wait_cond(TPMTestState *s);
 void *tpm_emu_ctrl_thread(void *data);
+bool tpm_model_is_available(const char *args, const char *tpm_if);
 
 #endif /* TESTS_TPM_EMU_H */