NetBSD/src YOfxeousys/arch/amd64/amd64 locore.S amd64_trap.S, sys/arch/amd64/include frameasm.h

   Two changes in the CPU mitigations:

    * Micro-optimize: put every mitigation in the same branch. This removes
      two branches in each exc/int return path, and removes all branches in
      the syscall return path.

    * Modify the SpectreV2 mitigation to be compatible with SpectreV4. I
      recently realized that both couldn't be enabled at the same time on
      Intel. This is because initially, when there was just SpectreV2, we
      could reset the whole IA32_SPEC_CTRL MSR. But then Intel added another
      bit in it for SpectreV4, so it isn't right to reset it entirely
      anymore. SSBD needs to stay.
VersionDeltaFile
1.185+17-25sys/arch/amd64/amd64/locore.S
1.48+20-8sys/arch/amd64/amd64/amd64_trap.S
1.44+5-5sys/arch/amd64/include/frameasm.h
+42-383 files

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