From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C437FC433EF for ; Sun, 17 Jun 2018 16:35:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7037D208AE for ; Sun, 17 Jun 2018 16:35:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=firstfloor.org header.i=@firstfloor.org header.b="h/yz79Az" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7037D208AE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=firstfloor.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934171AbeFQQff (ORCPT ); Sun, 17 Jun 2018 12:35:35 -0400 Received: from one.firstfloor.org ([193.170.194.197]:48290 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933875AbeFQQfe (ORCPT ); Sun, 17 Jun 2018 12:35:34 -0400 Received: by one.firstfloor.org (Postfix, from userid 503) id 2810D868EF; Sun, 17 Jun 2018 18:35:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=firstfloor.org; s=mail; t=1529253332; bh=2GjcbqoNDGb+mBj0Bw3sZ1WewKWaV1YFE88dr23lBqo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=h/yz79Azjp599++UEGfH5EsRkmL18/325XpKSXKmDwE0lZJ3lUPudqq7ijxiRCata SFKDeJRQQosuTLKhJxjikhARRG1LFNl+Jox06Sete3Gq53KgfBL7hXXdbiYmkGXv6s ls1SPq0t58TH+UMvKMoUTcj85m4Mbl+G2ImGV8+U= Date: Sun, 17 Jun 2018 09:35:31 -0700 From: Andi Kleen To: Keno Fischer Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , x86@kernel.org, "H. Peter Anvin" , Borislav Petkov , Dave Hansen , Andi Kleen , Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Kyle Huey , Robert O'Callahan Subject: Re: [RFC PATCH] x86/arch_prctl: Add ARCH_SET_XCR0 to mask XCR0 per-thread Message-ID: <20180617163530.rvwf7fcukmoletgo@two.firstfloor.org> References: <1529195582-64207-1-git-send-email-keno@alumni.harvard.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1529195582-64207-1-git-send-email-keno@alumni.harvard.edu> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Patch seems pointless if you can already control CPUID, which rr supports. Just disable AVX512 in CPUID. All code using AVX should check cpuid (or will fail anyways). -Andi