[PATCH v2 2/3] tests/qtest/libqtest: add qtest_has_cpu() api

[Ani Sinha]

Added a new test api qtest_has_cpu() in order to check availability of some
cpu models in the current QEMU binary. The specific architecture of the QEMU
binary is selected using the QTEST_QEMU_BINARY environment variable. This api
would be useful to run tests against some older cpu models after checking if
QEMU actually supported these models.

CC: thuth@redhat.com
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Reviewed-by: Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/qtest/libqtest.c | 83 ++++++++++++++++++++++++++++++++++++++++++
 tests/qtest/libqtest.h |  8 ++++
 2 files changed, 91 insertions(+)

changelist:
v2: changes related to suggestions made by danpb. added tags.

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index d8f80d335e..7647818c66 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -37,6 +37,7 @@
 #include "qapi/qmp/qjson.h"
 #include "qapi/qmp/qlist.h"
 #include "qapi/qmp/qstring.h"
+#include "qapi/qmp/qbool.h"
 
 #define MAX_IRQ 256
 
@@ -1471,6 +1472,12 @@ struct MachInfo {
     char *alias;
 };
 
+struct CpuInfo {
+    char *name;
+    char *alias_of;
+    bool deprecated;
+};
+
 static void qtest_free_machine_list(struct MachInfo *machines)
 {
     if (machines) {
@@ -1550,6 +1557,82 @@ static struct MachInfo *qtest_get_machines(const char 
*var)
     return machines;
 }
 
+static struct CpuInfo *qtest_get_cpus(void)
+{
+    static struct CpuInfo *cpus;
+    QDict *response, *minfo;
+    QList *list;
+    const QListEntry *p;
+    QObject *qobj;
+    QString *qstr;
+    QBool *qbool;
+    QTestState *qts;
+    int idx;
+
+    if (cpus) {
+        return cpus;
+    }
+
+    silence_spawn_log = !g_test_verbose();
+
+    qts = qtest_init_with_env(NULL, "-machine none");
+    response = qtest_qmp(qts, "{ 'execute': 'query-cpu-definitions' }");
+    g_assert(response);
+    list = qdict_get_qlist(response, "return");
+    g_assert(list);
+
+    cpus = g_new0(struct CpuInfo, qlist_size(list) + 1);
+
+    for (p = qlist_first(list), idx = 0; p; p = qlist_next(p), idx++) {
+        minfo = qobject_to(QDict, qlist_entry_obj(p));
+        g_assert(minfo);
+
+        qobj = qdict_get(minfo, "name");
+        g_assert(qobj);
+        qstr = qobject_to(QString, qobj);
+        g_assert(qstr);
+        cpus[idx].name = g_strdup(qstring_get_str(qstr));
+
+        qobj = qdict_get(minfo, "alias_of");
+        if (qobj) { /* old machines do not report aliases */
+            qstr = qobject_to(QString, qobj);
+            g_assert(qstr);
+            cpus[idx].alias_of = g_strdup(qstring_get_str(qstr));
+        } else {
+            cpus[idx].alias_of = NULL;
+        }
+
+        qobj = qdict_get(minfo, "deprecated");
+        qbool = qobject_to(QBool, qobj);
+        g_assert(qbool);
+        cpus[idx].deprecated = qbool_get_bool(qbool);
+    }
+
+    qtest_quit(qts);
+    qobject_unref(response);
+
+    silence_spawn_log = false;
+
+    return cpus;
+}
+
+bool qtest_has_cpu(const char *cpu)
+{
+    struct CpuInfo *cpus;
+    int i;
+
+    cpus = qtest_get_cpus();
+
+    for (i = 0; cpus[i].name != NULL; i++) {
+        if (g_str_equal(cpu, cpus[i].name) ||
+            (cpus[i].alias_of && g_str_equal(cpu, cpus[i].alias_of))) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 void qtest_cb_for_every_machine(void (*cb)(const char *machine),
                                 bool skip_old_versioned)
 {
diff --git a/tests/qtest/libqtest.h b/tests/qtest/libqtest.h
index 6e3d3525bf..c94b64f960 100644
--- a/tests/qtest/libqtest.h
+++ b/tests/qtest/libqtest.h
@@ -949,6 +949,14 @@ bool qtest_has_machine(const char *machine);
  */
 bool qtest_has_machine_with_env(const char *var, const char *machine);
 
+/**
+ * qtest_has_cpu:
+ * @cpu: The cpu to look for
+ *
+ * Returns: true if the cpu is available in the target binary.
+ */
+bool qtest_has_cpu(const char *cpu);
+
 /**
  * qtest_has_device:
  * @device: The device to look for
-- 
2.42.0