tests: Add test code for CPUID level/xlevel handling

Add test code that will check if the automatic CPUID level
changes are working as expected.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

tests/.gitignore

@@ -75,6 +75,7 @@ test-visitor-serialization
 test-vmstate
 test-write-threshold
 test-x86-cpuid
+test-x86-cpuid-compat
 test-xbzrle
 test-netfilter
 test-filter-mirror

tests/Makefile.include

@@ -243,6 +243,7 @@ check-qtest-i386-y += tests/test-netfilter$(EXESUF)
 check-qtest-i386-y += tests/test-filter-mirror$(EXESUF)
 check-qtest-i386-y += tests/test-filter-redirector$(EXESUF)
 check-qtest-i386-y += tests/postcopy-test$(EXESUF)
+check-qtest-i386-y += tests/test-x86-cpuid-compat$(EXESUF)
 check-qtest-x86_64-y += $(check-qtest-i386-y)
 gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c
 gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y))
@@ -663,6 +664,7 @@ tests/test-write-threshold$(EXESUF): tests/test-write-threshold.o $(test-block-o
 tests/test-netfilter$(EXESUF): tests/test-netfilter.o $(qtest-obj-y)
 tests/test-filter-mirror$(EXESUF): tests/test-filter-mirror.o $(qtest-obj-y)
 tests/test-filter-redirector$(EXESUF): tests/test-filter-redirector.o $(qtest-obj-y)
+tests/test-x86-cpuid-compat$(EXESUF): tests/test-x86-cpuid-compat.o $(qtest-obj-y)
 tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
 tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o
 tests/ptimer-test$(EXESUF): tests/ptimer-test.o tests/ptimer-test-stubs.o hw/core/ptimer.o

tests/test-x86-cpuid-compat.c

@@ -0,0 +1,108 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qapi/qmp/qlist.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qint.h"
+#include "libqtest.h"
+
+static char *get_cpu0_qom_path(void)
+{
+    QDict *resp;
+    QList *ret;
+    QDict *cpu0;
+    char *path;
+
+    resp = qmp("{'execute': 'query-cpus', 'arguments': {}}");
+    g_assert(qdict_haskey(resp, "return"));
+    ret = qdict_get_qlist(resp, "return");
+
+    cpu0 = qobject_to_qdict(qlist_peek(ret));
+    path = g_strdup(qdict_get_str(cpu0, "qom_path"));
+    QDECREF(resp);
+    return path;
+}
+
+static QObject *qom_get(const char *path, const char *prop)
+{
+    QDict *resp = qmp("{ 'execute': 'qom-get',"
+                      "  'arguments': { 'path': %s,"
+                      "                 'property': %s } }",
+                      path, prop);
+    QObject *ret = qdict_get(resp, "return");
+    qobject_incref(ret);
+    QDECREF(resp);
+    return ret;
+}
+
+typedef struct CpuidTestArgs {
+    const char *cmdline;
+    const char *property;
+    int64_t expected_value;
+} CpuidTestArgs;
+
+static void test_cpuid_prop(const void *data)
+{
+    const CpuidTestArgs *args = data;
+    char *path;
+    QInt *value;
+
+    qtest_start(args->cmdline);
+    path = get_cpu0_qom_path();
+    value = qobject_to_qint(qom_get(path, args->property));
+    g_assert_cmpint(qint_get_int(value), ==, args->expected_value);
+    qtest_end();
+
+    QDECREF(value);
+    g_free(path);
+}
+
+static void add_cpuid_test(const char *name, const char *cmdline,
+                           const char *property, int64_t expected_value)
+{
+    CpuidTestArgs *args = g_new0(CpuidTestArgs, 1);
+    args->cmdline = cmdline;
+    args->property = property;
+    args->expected_value = expected_value;
+    qtest_add_data_func(name, args, test_cpuid_prop);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    /* Original level values for CPU models: */
+    add_cpuid_test("x86/cpuid/phenom/level",
+                   "-cpu phenom", "level", 5);
+    add_cpuid_test("x86/cpuid/Conroe/level",
+                   "-cpu Conroe", "level", 10);
+    add_cpuid_test("x86/cpuid/SandyBridge/level",
+                   "-cpu SandyBridge", "level", 0xd);
+    add_cpuid_test("x86/cpuid/486/xlevel",
+                   "-cpu 486", "xlevel", 0);
+    add_cpuid_test("x86/cpuid/core2duo/xlevel",
+                   "-cpu core2duo", "xlevel", 0x80000008);
+    add_cpuid_test("x86/cpuid/phenom/xlevel",
+                   "-cpu phenom", "xlevel", 0x8000001A);
+
+    /* If level is not large enough, it should increase automatically: */
+    /* CPUID[EAX=7,ECX=0].EBX: */
+    add_cpuid_test("x86/cpuid/auto-level/phenom/fsgsbase",
+                   "-cpu phenom,+fsgsbase", "level", 7);
+
+    /* If level is already large enough, it shouldn't change: */
+    add_cpuid_test("x86/cpuid/auto-level/SandyBridge/multiple",
+                   "-cpu SandyBridge,+arat,+fsgsbase,+avx512vbmi",
+                   "level", 0xd);
+
+    /* if xlevel is already large enough, it shouldn't change: */
+    add_cpuid_test("x86/cpuid/auto-xlevel/phenom/3dnow",
+                   "-cpu phenom,+3dnow,+sse4a,+invtsc,+npt",
+                   "xlevel", 0x8000001A);
+
+    /* if xlevel2 is already large enough, it shouldn't change: */
+    add_cpuid_test("x86/cpuid/auto-xlevel2/486/fixed",
+                   "-cpu 486,xlevel2=0xC0000002,+xstore",
+                   "xlevel2", 0xC0000002);
+
+    return g_test_run();
+}