Some users may not need LSX/LASX, this patch allows the user
enable/disable LSX/LASX features.

 e.g
 '-cpu max,lsx=on,lasx=on'   (default);
 '-cpu max,lsx=on,lasx=off'  (enabled LSX);
 '-cpu max,lsx=off,lasx=on'  (enabled LASX, LSX);
 '-cpu max,lsx=off'          (disable LSX and LASX).

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu.c | 78 ++++++++++++++++++++++++++++++++++++++++++
 target/loongarch/cpu.h |  8 +++++
 2 files changed, 86 insertions(+)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 87fcd08110..48ad4f9d8b 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -447,6 +447,7 @@ static void loongarch_la464_initfn(Object *obj)
     env->cpucfg[20] = data;
 
     env->CSR_ASID = FIELD_DP64(0, CSR_ASID, ASIDBITS, 0xa);
+    loongarch_cpu_post_init(obj);
 }
 
 static void loongarch_la132_initfn(Object *obj)
@@ -626,6 +627,83 @@ static const MemoryRegionOps loongarch_qemu_ops = {
 };
 #endif
 
+static bool loongarch_get_lsx(Object *obj, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+    bool ret;
+
+    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
+        ret = true;
+        cpu->has_lsx = ON_OFF_AUTO_AUTO;
+    } else {
+        ret = false;
+        cpu->has_lsx = ON_OFF_AUTO_OFF;
+    }
+    return ret;
+}
+
+static void loongarch_set_lsx(Object *obj, bool value, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+    if (value) {
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 1);
+    } else {
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 0);
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 0);
+    }
+
+    cpu->has_lsx = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+}
+
+static bool loongarch_get_lasx(Object *obj, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+    bool ret;
+
+    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LASX)) {
+        ret = true;
+        cpu->has_lasx = true;
+    } else {
+        ret = false;
+        cpu->has_lasx = false;
+    }
+    return ret;
+}
+
+static void loongarch_set_lasx(Object *obj, bool value, Error **errp)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+
+    if (value) {
+        if (cpu->has_lsx == ON_OFF_AUTO_AUTO || cpu->has_lsx == ON_OFF_AUTO_OFF) {
+            cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LSX, 1);
+	}
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 1);
+    } else {
+        cpu->env.cpucfg[2] = FIELD_DP32(cpu->env.cpucfg[2], CPUCFG2, LASX, 0);
+    }
+
+    cpu->has_lasx = value;
+}
+
+void loongarch_cpu_post_init(Object *obj)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+    CPULoongArchState *env = &cpu->env;
+
+    if (loongarch_feature(env, CPU_FEATURE_LSX)) {
+        cpu->has_lsx = ON_OFF_AUTO_AUTO;
+        object_property_add_bool(obj, "lsx", loongarch_get_lsx,
+                                 loongarch_set_lsx);
+    }
+    if (loongarch_feature(env, CPU_FEATURE_LASX)) {
+        cpu->has_lasx = ON_OFF_AUTO_AUTO;
+        object_property_add_bool(obj, "lasx", loongarch_get_lasx,
+                                 loongarch_set_lasx);
+    }
+}
+
 static void loongarch_cpu_init(Object *obj)
 {
 #ifndef CONFIG_USER_ONLY
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index b98064945a..b63ebe16ac 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -13,6 +13,7 @@
 #include "fpu/softfloat-types.h"
 #include "hw/registerfields.h"
 #include "qemu/timer.h"
+#include "qapi/qapi-types-common.h"
 #ifndef CONFIG_USER_ONLY
 #include "exec/memory.h"
 #endif
@@ -413,6 +414,11 @@ struct ArchCPU {
 
     /* 'compatible' string for this CPU for Linux device trees */
     const char *dtb_compatible;
+
+    /* CPU has LSX */
+    OnOffAuto has_lsx;
+    /* CPU has  LASX */
+    OnOffAuto has_lasx;
 };
 
 #define TYPE_LOONGARCH_CPU "loongarch-cpu"
@@ -518,4 +524,6 @@ void loongarch_cpu_list(void);
 #define LOONGARCH_CPU_TYPE_NAME(model) model LOONGARCH_CPU_TYPE_SUFFIX
 #define CPU_RESOLVING_TYPE TYPE_LOONGARCH_CPU
 
+void loongarch_cpu_post_init(Object *obj);
+
 #endif /* LOONGARCH_CPU_H */
-- 
2.25.1