References: bnc#656245

--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1223,7 +1223,7 @@ static int fixup_page_fault(unsigned lon
 
     if ( unlikely(IN_HYPERVISOR_RANGE(addr)) )
     {
-        if ( !(regs->error_code & PFEC_reserved_bit) &&
+        if ( !(regs->error_code & (PFEC_user_mode | PFEC_reserved_bit)) &&
              (addr >= GDT_LDT_VIRT_START) && (addr < GDT_LDT_VIRT_END) )
             return handle_gdt_ldt_mapping_fault(
                 addr - GDT_LDT_VIRT_START, regs);