From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936224AbdACWJ4 (ORCPT ); Tue, 3 Jan 2017 17:09:56 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:33146 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757310AbdACWJj (ORCPT ); Tue, 3 Jan 2017 17:09:39 -0500 Date: Tue, 3 Jan 2017 23:09:35 +0100 From: Pavel Machek To: Grzegorz Andrejczuk Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, linux-kernel@vger.kernel.org, Piotr.Luc@intel.com, dave.hansen@linux.intel.com Subject: Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Message-ID: <20170103220935.GB22548@amd> References: <1482241726-27310-1-git-send-email-grzegorz.andrejczuk@intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="zx4FCpZtqtKETZ7O" Content-Disposition: inline In-Reply-To: <1482241726-27310-1-git-send-email-grzegorz.andrejczuk@intel.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --zx4FCpZtqtKETZ7O Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue 2016-12-20 14:48:41, Grzegorz Andrejczuk wrote: > Following patches enable the use of the feature that allows > the Intel Xeon Phi x200 devices to use MONITOR/MWAIT instructions > outside ring 0. It allows userspace applications to use > more efficient synchronization operations, which improves performance > and energy efficiency. What kind of security holes does it bring us? rdseed can be used for two processes to communicate when they should not (serious problem for android). Can this be used for something similar? Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --zx4FCpZtqtKETZ7O Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlhsIR8ACgkQMOfwapXb+vIwlgCZATbR5UHUgT24+JluDAuWpqc1 x1kAnioFBXt/sE4a7t/SwHIf8vPfsee1 =VS8h -----END PGP SIGNATURE----- --zx4FCpZtqtKETZ7O--