diff --git a/VKernel/Kernel/paging/paging.vp b/VKernel/Kernel/paging/paging.vp
index 2f21fea..0cb8027 100644
--- a/VKernel/Kernel/paging/paging.vp
+++ b/VKernel/Kernel/paging/paging.vp
@@ -205,7 +205,11 @@ def _set_page_writable(phys_addr: t.CUInt64T):
     pd_s: _p | t.CPtr = t.CType(pdp_s.entries[pdp_idx] & ~t.CUInt64T(0xFFF), _p, t.CPtr)
     pd_idx: t.CUInt64T = (va >> 21) & 0x1FF
     if not (pd_s.entries[pd_idx] & PTE_PRESENT): return
-    if pd_s.entries[pd_idx] & PTE_PS: return
+    if pd_s.entries[pd_idx] & PTE_PS:
+        # 2MB 大页：W 位在 PD 条目自身（无下层 PT），直接置位
+        pd_s.entries[pd_idx] = pd_s.entries[pd_idx] | t.CUInt64T(PTE_WRITABLE)
+        c.Asm(f"invlpg [{c.AsmInp(va, t.ASM_DESCR.REG_ANY)}]")
+        return
     pt_s: _p | t.CPtr = t.CType(pd_s.entries[pd_idx] & ~t.CUInt64T(0xFFF), _p, t.CPtr)
     pt_idx: t.CUInt64T = (va >> 12) & 0x1FF
     pt_s.entries[pt_idx] = pt_s.entries[pt_idx] | t.CUInt64T(PTE_WRITABLE)