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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 EF2ABC433DF for ; Mon, 15 Jun 2020 15:47:48 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A44B42078E for ; Mon, 15 Jun 2020 15:47:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A44B42078E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5C4B36E365; Mon, 15 Jun 2020 15:47:48 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1BED989D56 for ; Mon, 15 Jun 2020 14:53:47 +0000 (UTC) IronPort-SDR: Bs/k7cYNEJoN7c6GfUKYcWdpxIps+Pyr9PlDSOZlAvn5bWw3/lxc8r/VZ5A14OFVfCZg/oepTY OYLaXZ/PgmfA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jun 2020 07:53:46 -0700 IronPort-SDR: hBkuUtQL8+lhTWXLYi651EBCBrGOEnQVfzIuldPKgK9Hg1HqC5sQmkx3kq2cejv4s2HjL2N4xD LCQ6U6PgIXpQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,514,1583222400"; d="scan'208";a="382567032" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by fmsmga001.fm.intel.com with ESMTP; 15 Jun 2020 07:53:46 -0700 Date: Mon, 15 Jun 2020 07:53:46 -0700 From: Fenghua Yu To: Peter Zijlstra Subject: Re: [PATCH v2 00/12] x86: tag application address space for devices Message-ID: <20200615145345.GA13792@romley-ivt3.sc.intel.com> References: <1592008893-9388-1-git-send-email-fenghua.yu@intel.com> <20200615075202.GI2497@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200615075202.GI2497@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.23 (2014-03-12) X-Mailman-Approved-At: Mon, 15 Jun 2020 15:47:47 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , H Peter Anvin , Dave Jiang , Ashok Raj , Joerg Roedel , x86 , amd-gfx , Ingo Molnar , Ravi V Shankar , Yu-cheng Yu , Andrew Donnellan , Borislav Petkov , Sohil Mehta , Thomas Gleixner , Tony Luck , linuxppc-dev , Felix Kuehling , linux-kernel , iommu@lists.linux-foundation.org, Jacob Jun Pan , Frederic Barrat , David Woodhouse , Lu Baolu Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Hi, Peter, On Mon, Jun 15, 2020 at 09:52:02AM +0200, Peter Zijlstra wrote: > 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. PASID value is per mm and all threads in a process have the same PASID value in the MSR. However, the MSR is per thread and is context switched by XSAVES/XRSTROS in patches 6-7. Thanks. -Fenghua _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx