From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1756493AbdGYAoD (ORCPT <rfc822;w@1wt.eu>);
        Mon, 24 Jul 2017 20:44:03 -0400
Received: from mga02.intel.com ([134.134.136.20]:42569 "EHLO mga02.intel.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1754238AbdGYAn5 (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 24 Jul 2017 20:43:57 -0400
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.40,409,1496127600"; 
   d="scan'208";a="128960880"
From: Andi Kleen <andi@firstfloor.org>
To: x86@kernel.org
Cc: hpa@zytor.com, linux-kernel@vger.kernel.org
Subject: Support generic disabling of all XSAVE features
Date: Mon, 24 Jul 2017 17:43:48 -0700
Message-Id: <20170725004353.5280-1-andi@firstfloor.org>
X-Mailer: git-send-email 2.9.4
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

For performance testing and debugging it can be useful to disable XSAVE
features individually. This patchkit hooks up XSAVE with the
generic clearcpuid=... option, so that disabling a CPUID feature
automatically disables the respective XSAVE feature.

It also cleans up CPUID dependency management. Currently it's
possible to generate configurations with cleacpuid that crash.

It replaces an earlier patchkit that did this with special
case options.

v1:
Initial post
v2:
Work around broken lguest by exporting set_cpu_cap
Repost with cover letter
v3:
Repost. No changes to code.
v4:
Rebase to latest tree. Repost.