diff --git a/VKernel/Kernel/drivers/core/cpu/apic.vp b/VKernel/Kernel/drivers/core/cpu/apic.vp
index be57b2a..3e872b5 100644
--- a/VKernel/Kernel/drivers/core/cpu/apic.vp
+++ b/VKernel/Kernel/drivers/core/cpu/apic.vp
@@ -237,8 +237,11 @@ def start_aps():
 
 def early_init():
     global _cpu_count, _bsp_lapic_id
-    features: t.CUInt32T = cpu.detect_features_static()
-    if features & cpu.CPU_FEATURE_APIC:
+    # 直接以 IA32_APIC_BASE 的 EN 位(bit 11)判断 APIC 是否可用：
+    # QEMU/OVMF 必启用，且 msr_read 路径已在前置流程验证可用；
+    # 比依赖 cpuid 特性位更可靠（避免 cpuid 包装被误判时静默跳过 init）。
+    msr_val: t.CUInt64T = cpu.msr_read(IA32_APIC_BASE)
+    if msr_val & APIC_BASE_MSR_ENABLE:
         init()
         _cpu_count = detect_cpu_count()
     else:
@@ -247,5 +250,8 @@ def early_init():
 def get_cpu_count() -> t.CUInt32T:
     return _cpu_count
 
+def get_base() -> t.CUInt64T:
+    return _lapic_base
+
 def get_lapic_id() -> t.CUInt32T:
     return get_id()
diff --git a/VKernel/Kernel/main.vp b/VKernel/Kernel/main.vp
index 42681d7..55da781 100644
--- a/VKernel/Kernel/main.vp
+++ b/VKernel/Kernel/main.vp
@@ -78,13 +78,19 @@ class ViperKernel:
         apic.early_init()
         serial.puts("[main] apic init done\n")
 
-        # [DBG] 读回 LAPIC LINT0 与 APIC BASE MSR，验证 EXTINT 配置（用后移除）
-        _lint0: t.CUInt32T = apic.read(0x350)
-        _apic_msr: t.CUInt64T = cpu.msr_read(apic.IA32_APIC_BASE)
-        _abuf: t.CArray[t.CChar, 96]
-        viperlib.snprintf(c.Addr(_abuf), 96, "[APIC] lint0=0x%x apic_base_msr=0x%lx\n",
-                          _lint0, _apic_msr)
-        serial.puts(c.Addr(_abuf))
+        # [DBG] 综合诊断：判定 LAPIC MMIO 是否真正可访问/可写（用后移除）
+        _dbg_base: t.CUInt64T = apic.get_base()
+        _dbg_ver: t.CUInt32T = apic.read(0x030)      # LAPIC_VERSION：真 LAPIC 应为 0x50014
+        _dbg_svr: t.CUInt32T = apic.read(0x0F0)      # LAPIC_SVR：init 已写 0x1FF
+        apic.write(0x350, 0x700)                      # 再次写 LINT0，验证写粘性
+        _dbg_lint0: t.CUInt32T = apic.read(0x350)
+        _dbg_feat: t.CUInt32T = cpu.detect_features_static()
+        _dbg_buf: t.CArray[t.CChar, 160]
+        viperlib.snprintf(c.Addr(_dbg_buf), 160,
+            "[DBG] base=0x%lx ver=0x%x svr=0x%x lint0=0x%x feat=0x%x apic=%d\n",
+            _dbg_base, _dbg_ver, _dbg_svr, _dbg_lint0, _dbg_feat,
+            1 if (_dbg_feat & cpu.CPU_FEATURE_APIC) else 0)
+        serial.puts(c.Addr(_dbg_buf))
 
         asm.sti()
         serial.puts("[main] sti done\n")