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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 4609FC433E0 for ; Mon, 15 Jun 2020 07:52:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F2C02067B for ; Mon, 15 Jun 2020 07:52:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PJLM8Zj6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728935AbgFOHw2 (ORCPT ); Mon, 15 Jun 2020 03:52:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728368AbgFOHw0 (ORCPT ); Mon, 15 Jun 2020 03:52:26 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC114C061A0E for ; Mon, 15 Jun 2020 00:52:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=IFIgfCZKxYBKxbJqOaOomXVh77FtYCcmEiPni2KP6UA=; b=PJLM8Zj6g6NZ+vPpv2mFDxYEVR ZjwG4jOU060O8kA/hZ3nBzvV0Ys1Ob067i4BJAzLXk0kJFvnTPk9HZv2N4bq1zlOx6kt6I0wYqNYD WxXEU7shn6V1Hnnc7bMPriYIGQJxK6my2wENuYqexpKzud2otelfOGiVZI8ThFKaGsZx3wAkFAehx xyuZg+PiJgIGmBooQprqIC07vu+0si6nXsW+gBniM0mtgDy0EY4XX2SW3mvm3WDBh0Zyo6E43wWXf h7zkeOgMVO5U0sw55sa+N7+9CXGuXOBfv7vXirugectMtOB6P+FPq3eo1CWbJiozbXhA4ITyj/cH5 ElEiN+6w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jkjua-0001C1-5z; Mon, 15 Jun 2020 07:52:08 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A2710307458; Mon, 15 Jun 2020 09:52:03 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id EF23021059BE4; Mon, 15 Jun 2020 09:52:02 +0200 (CEST) Date: Mon, 15 Jun 2020 09:52:02 +0200 From: Peter Zijlstra To: Fenghua Yu Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , David Woodhouse , Lu Baolu , Frederic Barrat , Andrew Donnellan , Felix Kuehling , Joerg Roedel , Dave Hansen , Tony Luck , Ashok Raj , Jacob Jun Pan , Dave Jiang , Yu-cheng Yu , Sohil Mehta , Ravi V Shankar , linux-kernel , x86 , iommu@lists.linux-foundation.org, amd-gfx , linuxppc-dev Subject: Re: [PATCH v2 00/12] x86: tag application address space for devices Message-ID: <20200615075202.GI2497@hirez.programming.kicks-ass.net> References: <1592008893-9388-1-git-send-email-fenghua.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1592008893-9388-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 12, 2020 at 05:41:21PM -0700, Fenghua Yu wrote: > This series only provides simple and basic support for ENQCMD and the MSR: > 1. Clean up type definitions (patch 1-3). These patches can be in a > separate series. > - Define "pasid" as "unsigned int" consistently (patch 1 and 2). > - Define "flags" as "unsigned int" > 2. Explain different various technical terms used in the series (patch 4). > 3. Enumerate support for ENQCMD in the processor (patch 5). > 4. Handle FPU PASID state and the MSR during context switch (patches 6-7). > 5. Define "pasid" in mm_struct (patch 8). > 5. Clear PASID state for new mm and forked and cloned thread (patch 9-10). > 6. Allocate and free PASID for a process (patch 11). > 7. Fix up the PASID MSR in #GP handler when one thread in a process > executes ENQCMD for the first time (patches 12). If this is per mm, should not switch_mm() update the MSR ? I'm not seeing that, nor do I see it explained why not.