From owner-cvs-src@FreeBSD.ORG Sat May 14 09:39:10 2005 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6A07E16A4CE; Sat, 14 May 2005 09:39:10 +0000 (GMT) Received: from pd4mo3so.prod.shaw.ca (shawidc-mo1.cg.shawcable.net [24.71.223.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2E81743D3F; Sat, 14 May 2005 09:39:10 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd3mr8so.prod.shaw.ca (pd3mr8so-qfe3.prod.shaw.ca [10.0.141.24])2004)) with ESMTP id <0IGH00EW3459VV50@l-daemon>; Sat, 14 May 2005 03:39:09 -0600 (MDT) Received: from pn2ml6so.prod.shaw.ca ([10.0.121.150]) by pd3mr8so.prod.shaw.ca (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0IGH003CM459ZHH0@pd3mr8so.prod.shaw.ca>; Sat, 14 May 2005 03:39:09 -0600 (MDT) Received: from [127.0.0.1] (S0106006067227a4a.vc.shawcable.net [24.87.209.6]) 2003)) with ESMTP id <0IGH00005457XE@l-daemon>; Sat, 14 May 2005 03:39:09 -0600 (MDT) Date: Sat, 14 May 2005 05:39:07 -0400 From: Colin Percival In-reply-to: <20050514093203.GA81770@FreeBSD.org> To: Alexey Dokuchaev Message-id: <4285C73B.3040409@freebsd.org> MIME-version: 1.0 Content-type: text/plain; charset=KOI8-R Content-transfer-encoding: 7bit X-Accept-Language: en-us, en X-Enigmail-Version: 0.91.0.0 References: <200505130001.j4D01KcE015393@repoman.freebsd.org> <20050514093203.GA81770@FreeBSD.org> User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050406) cc: Jacques Vidrine cc: cvs-src@FreeBSD.org cc: src-committers@FreeBSD.org cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/amd64/amd64 mp_machdep.csrc/sys/amd64/include cpufunc.h src/sys/i386/i386 mp_machdep.c src/sys/i386/include cpufunc.h X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 May 2005 09:39:11 -0000 Alexey Dokuchaev wrote: > On Fri, May 13, 2005 at 12:01:20AM +0000, Jacques Vidrine wrote: >> Add a knob for disabling/enabling HTT, "machdep.hyperthreading_allowed". >> Default off due to information disclosure on multi-user systems. > > Why not name it "machdep.hyperthreading_enabled" or even "machdep.htt_enabled" > for consistency with other ones? I was aiming for consistency with other security-related knobs: security.jail.set_hostname_allowed security.jail.sysvipc_allowed security.jail.chflags_allowed I ended up putting hyperthreading_allowed under machdep rather than security because 4.x doesn't have a security sysctl node, but the name was chosen to emphasize that hyperthreading is currently something dangerous which should be permitted only under certain circumstances, rather than a feature which can be enabled or disabled however you like. Colin Percival