From owner-svn-src-all@FreeBSD.ORG  Thu May 22 18:22:03 2014
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 47592F3D;
 Thu, 22 May 2014 18:22:03 +0000 (UTC)
Received: from svn.freebsd.org (svn.freebsd.org
 [IPv6:2001:1900:2254:2068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 34A4C2CD5;
 Thu, 22 May 2014 18:22:03 +0000 (UTC)
Received: from svn.freebsd.org ([127.0.1.70])
 by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s4MIM3DC091766;
 Thu, 22 May 2014 18:22:03 GMT (envelope-from jhb@svn.freebsd.org)
Received: (from jhb@localhost)
 by svn.freebsd.org (8.14.8/8.14.8/Submit) id s4MIM3NO091765;
 Thu, 22 May 2014 18:22:03 GMT (envelope-from jhb@svn.freebsd.org)
Message-Id: <201405221822.s4MIM3NO091765@svn.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 22 May 2014 18:22:03 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r266552 - head/sys/amd64/amd64
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
 user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all/>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 22 May 2014 18:22:03 -0000

Author: jhb
Date: Thu May 22 18:22:02 2014
New Revision: 266552
URL: http://svnweb.freebsd.org/changeset/base/266552

Log:
  Don't permit users to request a subset of the AVX512 or MPX xsave masks.
  
  These masks are documented in the Intel Architecture Instruction Set
  Extensions Programming Reference (March 2014).
  
  Reviewed by:	kib
  MFC after:	1 month

Modified:
  head/sys/amd64/amd64/fpu.c

Modified: head/sys/amd64/amd64/fpu.c
==============================================================================
--- head/sys/amd64/amd64/fpu.c	Thu May 22 18:13:17 2014	(r266551)
+++ head/sys/amd64/amd64/fpu.c	Thu May 22 18:22:02 2014	(r266552)
@@ -199,6 +199,10 @@ fpuinit_bsp1(void)
 	TUNABLE_ULONG_FETCH("hw.xsave_mask", &xsave_mask_user);
 	xsave_mask_user |= XFEATURE_ENABLED_X87 | XFEATURE_ENABLED_SSE;
 	xsave_mask &= xsave_mask_user;
+	if ((xsave_mask & XFEATURE_AVX512) != XFEATURE_AVX512)
+		xsave_mask &= ~XFEATURE_AVX512;
+	if ((xsave_mask & XFEATURE_MPX) != XFEATURE_MPX)
+		xsave_mask &= ~XFEATURE_MPX;
 
 	cpuid_count(0xd, 0x1, cp);
 	if ((cp[0] & CPUID_EXTSTATE_XSAVEOPT) != 0) {