On Skylake and above, Retpoline is not used because it is not robust.
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 0x400
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 0x400https://github.com/microsoft/SpeculationControl
https://support.microsoft.com/en-us/topic/kb4073119-windows-client-guidance-for-it-pros-to-protect-against-silicon-based-microarchitectural-and-speculative-execution-side-channel-vulnerabilities-35820a8a-ae13-1299-88cc-357f104f5b11
https://techcommunity.microsoft.com/t5/windows-os-platform-blog/mitigating-spectre-variant-2-with-retpoline-on-windows/ba-p/295618
https://terenceli.github.io/%E6%8A%80%E6%9C%AF/2018/03/24/retpoline
