On Tue, 2018-01-09 at 00:44 +0000, Woodhouse, David wrote: > On IRC, Arjan assures me that 'pause' here really is sufficient as a > speculation trap. If we do end up returning back here as a > misprediction, that 'pause' will stop the speculative execution on > affected CPUs even though it isn't *architecturally* documented to do > so. > > Arjan, can you confirm that in email please?
That actually doesn't make sense to me. If 'pause' alone is sufficient, then why in $DEITY's name would we need a '1:pause;jmp 1b' loop in the retpoline itself? Arjan?
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