From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=jv8X=6L=vger.kernel.org=linux-kernel-owner@kernel.org>
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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no
	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 6A2A7C4CECD
	for <linux-kernel@archiver.kernel.org>; Mon, 27 Apr 2020 20:34:39 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id 51735206D4
	for <linux-kernel@archiver.kernel.org>; Mon, 27 Apr 2020 20:34:39 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1726552AbgD0Uei (ORCPT
        <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 27 Apr 2020 16:34:38 -0400
Received: from mga07.intel.com ([134.134.136.100]:3582 "EHLO mga07.intel.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1726205AbgD0Uei (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 27 Apr 2020 16:34:38 -0400
IronPort-SDR: 0Xb+0f5+yB9gl0pCchZlaSjTDjZy845Pz5YpWW/8SBUvDvcNPkTHQpq6zhK5q7ypcr/hn6HEGY
 vZlfITZ352ug==
X-Amp-Result: SKIPPED(no attachment in message)
X-Amp-File-Uploaded: False
Received: from fmsmga001.fm.intel.com ([10.253.24.23])
  by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2020 13:34:37 -0700
IronPort-SDR: y2Sh/6x3rugWB7BHMA6491hj3iYPojS6oXNP7wDgPJYmdpNExEJXYQbseSl0O9k2ncAYQOLlz1
 pWhaTbvD8qzQ==
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.73,325,1583222400"; 
   d="scan'208";a="367278502"
Received: from romley-ivt3.sc.intel.com ([172.25.110.60])
  by fmsmga001.fm.intel.com with ESMTP; 27 Apr 2020 13:34:37 -0700
Date:   Mon, 27 Apr 2020 13:33:41 -0700
From:   Fenghua Yu <fenghua.yu@intel.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        H Peter Anvin <hpa@zytor.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Tony Luck <tony.luck@intel.com>,
        Ashok Raj <ashok.raj@intel.com>,
        Jacob Jun Pan <jacob.jun.pan@intel.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Sohil Mehta <sohil.mehta@intel.com>,
        Ravi V Shankar <ravi.v.shankar@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        x86 <x86@kernel.org>, iommu@lists.linux-foundation.org,
        Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: Re: [PATCH 3/7] x86/fpu/xstate: Add supervisor PASID state for
 ENQCMD feature
Message-ID: <20200427203341.GD242333@romley-ivt3.sc.intel.com>
References: <1585596788-193989-1-git-send-email-fenghua.yu@intel.com>
 <1585596788-193989-4-git-send-email-fenghua.yu@intel.com>
 <87v9lmsdhk.fsf@nanos.tec.linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <87v9lmsdhk.fsf@nanos.tec.linutronix.de>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sun, Apr 26, 2020 at 01:17:11PM +0200, Thomas Gleixner wrote:
> Fenghua Yu <fenghua.yu@intel.com> writes:
> > From: Yu-cheng Yu <yu-cheng.yu@intel.com>
> >
> > The IA32_PASID MSR is used when a task submits work via the ENQCMD
> > instruction.
> 
> Is used?
> 
> > The per task MSR is stored in the task's supervisor FPU
> 
> per task MSR? Lot's of MSRs ....
> 
> > PASID state and is context switched by XSAVES/XRSTORS.
> >

Maybe change the commit messge to the following?

ENQCMD instruction reads PASID from IA32_PASID MSR. The MSR is stored
in the task's supervisor FPU PASID state and is context switched by
XSAVES/XRSTORS.

Thanks.

-Fenghua