Think the MSR is from a microcode update https://lists.opensuse.org/opensuse-security-announce/2018-01/msg00005.html …
So looks like the Windows patches add "Speculation Control" if your CPU supports it, based on some new (old?) MSRs from Intel to control the Branch Target Buffer (BTB).
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Both are speculation based... no idea what this does to perf...?
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that should be
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