title: How can diable x2apic mode when booting kernel via kexec
body: <p>When I boot kernel via kexec, it enables x2apic mode and causes my board does not reboot from external hardware NMI. Booting kernel from BIOS does not enable this mode and no issue happen in my board.</p>
  
  <p>I am not sure whether in x2apic mode kernel can handle NMI successfully or not.</p>
  
  <p>If anyone understands x2apic mode, could you explain it for me? And how can we disable x2apic mode when booting kernel via kexec.</p>
  
  <p>Thanks a lot</p>