[Qemu-devel] [PATCH for-2.4 v5 7/7] tests: test-x86-cpu: Ensure that -cpu override KVM-specific defaults

[Eduardo Habkost <ehabkost@redhat.com>]

Add a test case to ensure reordering the feature handling code won't
make accelerator-specific defaults override explicit command-line
options. Explicit command-line options should always override the CPU
model defaults.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 tests/test-x86-cpu.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tests/test-x86-cpu.c b/tests/test-x86-cpu.c
index b1b04ea..618624b 100644
--- a/tests/test-x86-cpu.c
+++ b/tests/test-x86-cpu.c
@@ -160,6 +160,36 @@ static void test_host_cpu_features_kvm(void)
     all_unsupported = false;
 }
 
+/* Ensure that explicit CPU options always override KVM-specific defaults */
+static void test_kvm_override(void)
+{
+    int i;
+    kvm_allowed = true;
+
+    /* Even KVM defaults change on cpu.c, this test relies on x2apic being
+     * always enabled, and monitor being always disabled by KVM:
+     */
+    kvm_default_features[FEAT_1_ECX] |= CPUID_EXT_X2APIC;
+    kvm_default_unset_features[FEAT_1_ECX] |= CPUID_EXT_MONITOR;
+
+    for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); ++i) {
+        ObjectClass *oc;
+        X86CPU *cpu;
+        X86CPUDefinition *def = &builtin_x86_defs[i];
+        char features[] = "-x2apic,+monitor";
+
+        oc = x86_cpu_class_by_name(def->name);
+        cpu = X86_CPU(object_new(object_class_get_name(oc)));
+        x86_cpu_parse_featurestr(CPU(cpu), features, &error_abort);
+
+        g_assert_cmpint(cpu->env.features[FEAT_1_ECX] & CPUID_EXT_MONITOR, ==,
+                        CPUID_EXT_MONITOR);
+        g_assert_cmpint(cpu->env.features[FEAT_1_ECX] & CPUID_EXT_X2APIC, ==,
+                        0);
+        object_unref(OBJECT(cpu));
+    }
+}
+
 int main(int argc, char *argv[])
 {
     module_call_init(MODULE_INIT_QOM);
@@ -170,6 +200,7 @@ int main(int argc, char *argv[])
     g_test_add_func("/cpu/x86/features/tcg", test_cpu_features_tcg);
     g_test_add_func("/cpu/x86/features/kvm", test_cpu_features_kvm);
     g_test_add_func("/cpu/x86/features/host", test_host_cpu_features_kvm);
+    g_test_add_func("/cpu/x86/features/kvm-override", test_kvm_override);
 
     g_test_run();
 
-- 
2.1.0