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Side-Channel Security Issue: Software Support
https://software.intel.com/en-us/side-channel-security-support?wapkw=retpoline
＞FAQ
＞What is the advocated method to mitigate Branch Target Injection (Spectre variant 2)?

＞In many cases, a microcode update is recommended, as well.
マストじゃないんかいIntelさん