On 31 Jan 2018, at 14:36, Konstantin Belousov wrote:
Author: kib
Date: Wed Jan 31 14:36:27 2018
New Revision: 328625
URL: https://svnweb.freebsd.org/changeset/base/328625
Log:
IBRS support, AKA Spectre hardware mitigation.
For existing processors, you need a microcode update which adds IBRS
CPU features, and to manually enable it by setting the
tunable/sysctl
hw.ibrs_disable to 0. Current status can be checked in sysctl
hw.ibrs_active. The mitigation might be inactive if the CPU feature
Can you change the tunable/sysctl to hw.ibrs_enable[d] (and toggle the
default setting along).
I find it highly confusing to have two different sysctls “disable”
and “active” and a lot
of people (and cultures) have trouble with the double negative.
Also the “enable[d]” variant seems to be pre-dominant in the kernel.
Also can we spell IBRS in the sysctl description as “Indirect Branch
Restricted Speculation (IBRS)”?
Thanks
/bz
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