CVS log for src/sys/arch/amd64/amd64/locore.S

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Default branch: MAIN
Current tag: phil-wifi-20190609

Revision 1.185 / (download) - annotate - [select for diffs], Sat May 18 13:32:12 2019 UTC (4 years, 11 months ago) by maxv
Branch: MAIN
CVS Tags: phil-wifi-20190609, netbsd-9-base, netbsd-9-3-RELEASE, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1
Branch point for: netbsd-9
Changes since 1.184: +17 -25 lines
Diff to previous 1.184 (colored)

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.

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