kib ddd1c515e6 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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cpuctl.c