简介
从代码注释看，这个函数仅仅可以供SEV-ES虚拟机使用，因为这些虚拟机如果调用verify_cpu，将会导致在CPU启动的第二阶段无法处理#VC异常。其他非SEV-ES的虚拟机系统，尤其是Intel的需要执行verify_cpu，来确保NX的功能。
/*
* The secondary_startup_64_no_verify entry point is only used by
* SEV-ES guests. In those guests the call to verify_cpu() would cause
* #VC exceptions which can not be handled at this stage of secondary CPU bringup.
*
* All non SEV-ES systems, especially Intel systems, need to execute
* verify_cpu() above to make sure NX is enabled.
*/
SYM_INNER_LABEL(secondary