From owner-freebsd-stable@freebsd.org Sun Feb 18 16:12:36 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 24B73F14CCB for ; Sun, 18 Feb 2018 16:12:36 +0000 (UTC) (envelope-from david.marec@davenulle.org) Received: from smtp.smtpout.orange.fr (smtp09.smtpout.orange.fr [80.12.242.131]) by mx1.freebsd.org (Postfix) with ESMTP id A48517E12D for ; Sun, 18 Feb 2018 16:12:34 +0000 (UTC) (envelope-from david.marec@davenulle.org) Received: from [192.168.1.14] ([86.201.45.222]) by mwinf5d44 with ME id CG4v1x00Q4nd8WE03G4vQr; Sun, 18 Feb 2018 17:04:56 +0100 X-ME-Helo: [192.168.1.14] X-ME-Date: Sun, 18 Feb 2018 17:04:56 +0100 X-ME-IP: 86.201.45.222 Subject: Re: stable/11 r329462 - Meltdown/Spectre MFC questions To: freebsd-stable@freebsd.org References: <20180217194726.GA79666@icarus.home.lan> From: David Marec Message-ID: <58099107-bc04-8ad9-3909-16bf5297dd2b@davenulle.org> Date: Sun, 18 Feb 2018 17:04:55 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180217194726.GA79666@icarus.home.lan> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr-classic Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Feb 2018 16:12:36 -0000 On 17.02.2018 20:47, Jeremy Chadwick wrote: > hw.ibrs_disable > - Description: Disable Indirect Branch Restricted Speculation > - Loader tunable and sysctl tunable (read-write) > - Integer > - Default value: unsure. Variable declaration has 1 but > SYSCTL_PROC() macro has 0. > Strange thing is that tweaking `hw.ibrs_disable` has no effect on `hw.ibrs_active` on my side. -- David Marec https://lapinbilly.eu/