Konstantin Belousov 2dec2b4a34 amd64: flush L1 data cache on syscall return with an error.
The knob allows to select the flushing mode or turn it off/on.  The
idea, as well as the list of the ignored syscall errors, were taken
from https://www.openwall.com/lists/kernel-hardening/2018/10/11/10 .

I was not able to measure statistically significant difference between
flush enabled vs disabled using syscall_timing getuid.

Reviewed by:	bwidawsk
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D17536
2018-10-20 23:17:24 +00:00
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