svn commit: r328625 - in head/sys: amd64/amd64 amd64/ia32 amd64/include dev/cpuctl i386/i386 x86/include x86/x86
Bjoern A. Zeeb
bzeeb-lists at lists.zabbadoz.net
Wed Jan 31 14:56:30 UTC 2018
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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