Date: Wed, 31 Jan 2018 12:07:54 -0500 From: Ed Maste <emaste@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: Konstantin Belousov <kib@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r328625 - in head/sys: amd64/amd64 amd64/ia32 amd64/include dev/cpuctl i386/i386 x86/include x86/x86 Message-ID: <CAPyFy2B68aFZ5bKfLZVSwG0Pm8DngsL9qofsM7-DKtY3wrUnKA@mail.gmail.com> In-Reply-To: <FF98ADF0-829E-419B-89C3-9717F62CD4A7@lists.zabbadoz.net> References: <201801311436.w0VEaRrZ030839@repo.freebsd.org> <FF98ADF0-829E-419B-89C3-9717F62CD4A7@lists.zabbadoz.net>
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On 31 January 2018 at 09:56, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> wrote: > 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 had a similar thought while the change was in review, but saw that a number of tunables in similar areas also have negative sense. That said perhaps (some minor) consistency is not enough of an argument for the somewhat more confusing sense.
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