target/loongarch: Add vCPU property for kvm steal time feature

Property kvm-steal-time is added for kvm steal time feature, it is
specially for kvm mode.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>

target/loongarch/cpu.h

@@ -409,6 +409,7 @@ struct ArchCPU {
     OnOffAuto lsx;
     OnOffAuto lasx;
     OnOffAuto kvm_pv_ipi;
+    OnOffAuto kvm_steal_time;
 
     /* 'compatible' string for this CPU for Linux device trees */
     const char *dtb_compatible;

target/loongarch/kvm/kvm.c

@@ -1122,6 +1122,18 @@ static void kvm_pv_ipi_set(Object *obj, bool value, Error **errp)
     cpu->kvm_pv_ipi = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
 }
 
+static bool kvm_steal_time_get(Object *obj, Error **errp)
+{
+    return LOONGARCH_CPU(obj)->kvm_steal_time != ON_OFF_AUTO_OFF;
+}
+
+static void kvm_steal_time_set(Object *obj, bool value, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+    cpu->kvm_steal_time = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+}
+
 void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu)
 {
     cpu->lbt = ON_OFF_AUTO_AUTO;
@@ -1141,6 +1153,12 @@ void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu)
                              kvm_pv_ipi_set);
     object_property_set_description(OBJECT(cpu), "kvm-pv-ipi",
                                     "Set off to disable KVM paravirt IPI.");
+
+    cpu->kvm_steal_time = ON_OFF_AUTO_AUTO;
+    object_property_add_bool(OBJECT(cpu), "kvm-steal-time", kvm_steal_time_get,
+                             kvm_steal_time_set);
+    object_property_set_description(OBJECT(cpu), "kvm-steal-time",
+                                    "Set off to disable KVM steal time.");
 }
 
 int kvm_arch_destroy_vcpu(CPUState *cs)

target/loongarch/loongarch-qmp-cmds.c

@@ -40,7 +40,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 }
 
 static const char *cpu_model_advertised_features[] = {
-    "lsx", "lasx", "lbt", "pmu", "kvm-pv-ipi", NULL
+    "lsx", "lasx", "lbt", "pmu", "kvm-pv-ipi", "kvm-steal-time", NULL
 };
 
 CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,