1 files changed, 49 insertions, 1 deletions

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 3e4aee5ac2..6fb01e41e7 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -746,10 +746,53 @@ static void x86_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
     x86ms->max_ram_below_4g = value;
 }
 
+bool x86_machine_is_smm_enabled(X86MachineState *x86ms)
+{
+    bool smm_available = false;
+
+    if (x86ms->smm == ON_OFF_AUTO_OFF) {
+        return false;
+    }
+
+    if (tcg_enabled() || qtest_enabled()) {
+        smm_available = true;
+    } else if (kvm_enabled()) {
+        smm_available = kvm_has_smm();
+    }
+
+    if (smm_available) {
+        return true;
+    }
+
+    if (x86ms->smm == ON_OFF_AUTO_ON) {
+        error_report("System Management Mode not supported by this hypervisor.");
+        exit(1);
+    }
+    return false;
+}
+
+static void x86_machine_get_smm(Object *obj, Visitor *v, const char *name,
+                               void *opaque, Error **errp)
+{
+    X86MachineState *x86ms = X86_MACHINE(obj);
+    OnOffAuto smm = x86ms->smm;
+
+    visit_type_OnOffAuto(v, name, &smm, errp);
+}
+
+static void x86_machine_set_smm(Object *obj, Visitor *v, const char *name,
+                               void *opaque, Error **errp)
+{
+    X86MachineState *x86ms = X86_MACHINE(obj);
+
+    visit_type_OnOffAuto(v, name, &x86ms->smm, errp);
+}
+
 static void x86_machine_initfn(Object *obj)
 {
     X86MachineState *x86ms = X86_MACHINE(obj);
 
+    x86ms->smm = ON_OFF_AUTO_AUTO;
     x86ms->max_ram_below_4g = 0; /* use default */
     x86ms->smp_dies = 1;
 }
@@ -770,9 +813,14 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
     object_class_property_add(oc, X86_MACHINE_MAX_RAM_BELOW_4G, "size",
         x86_machine_get_max_ram_below_4g, x86_machine_set_max_ram_below_4g,
         NULL, NULL, &error_abort);
-
     object_class_property_set_description(oc, X86_MACHINE_MAX_RAM_BELOW_4G,
         "Maximum ram below the 4G boundary (32bit boundary)", &error_abort);
+
+    object_class_property_add(oc, X86_MACHINE_SMM, "OnOffAuto",
+        x86_machine_get_smm, x86_machine_set_smm,
+        NULL, NULL, &error_abort);
+    object_class_property_set_description(oc, X86_MACHINE_SMM,
+        "Enable SMM", &error_abort);
 }
 
 static const TypeInfo x86_machine_info = {