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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5538C433F5 for ; Fri, 3 Dec 2021 11:42:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380531AbhLCLqA (ORCPT ); Fri, 3 Dec 2021 06:46:00 -0500 Received: from wout3-smtp.messagingengine.com ([64.147.123.19]:33271 "EHLO wout3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234517AbhLCLp5 (ORCPT ); Fri, 3 Dec 2021 06:45:57 -0500 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.west.internal (Postfix) with ESMTP id A71953201C40; Fri, 3 Dec 2021 06:42:32 -0500 (EST) Received: from imap44 ([10.202.2.94]) by compute5.internal (MEProxy); Fri, 03 Dec 2021 06:42:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=flygoat.com; h= mime-version:message-id:in-reply-to:references:date:from:to:cc :subject:content-type:content-transfer-encoding; s=fm3; bh=qoZoq Zi5f6O1ZE9VN5Lkcc62PAK4WSBYtHV6+Z3ybsU=; b=EiPsUowdywIY4PSsz8Oh8 eTusZ3zAQDjVwsG7eTzmEo2BFd9p46JATi5IQ1uiUNUcPwAzyIfZtJO1UTMZGNnp doyhSmdsuge5mTGJp/U05tZWDzffguFQhcOnozaJepryTjJkMeuSYrRdAuXncUhV ksglf+e478n+xdetwoqm8Q2ML4tJML41sBGRTeYGShw5MS66CqWtBKJjOkcZJakm PlbjHOyfixzmcjDMueVrpu4c0UzY90gRFGKIK0yiHoi/KlF02Qrv9lb4Mo3r073A EiK8WZ0XOEn/FQ1mVmqn7PP40hemcEyaFzsRKSQJ9OBYiC4HJZTr+/3DgalGDMmm Q== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; bh=qoZoqZi5f6O1ZE9VN5Lkcc62PAK4WSBYtHV6+Z3yb sU=; b=e6lWcl2pigcyNlLyuQgXN1p6eag2PNnImA1bJNHnQSxyhNX07nQkprZ73 iwWo22pTh+NDzhlfhqqejnnF/Ss0fJrv8SK6pDHVj0iXeGAnlyf7BoYMgKJBiRqj ueiUcqPo8LruaIvy+vWnpsU3vSKpotjXrjSLbX+mix8ID0WIXGg5URok7IoWfFEI +8EPdPz4075I9xzPmb71h66AyuLVBL4MVQPZINrMVw0GjSz1bWGNyQ4KRjoxJfoX qeGiHYhvUDcckn7JEH7fBeNSqM1ksnQvaknPkTSAwjWLd8VEAHSjJIwWqAEmyJ4Y Go93TuoiOwHDB6j3avDFzJxrte90A== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvuddrieejgdeffecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefofgggkfgjfhffhffvufgtgfesthhqredtreerjeenucfhrhhomhepfdflihgr gihunhcujggrnhhgfdcuoehjihgrgihunhdrhigrnhhgsehflhihghhorghtrdgtohhmqe enucggtffrrghtthgvrhhnpeefteegkeevfeethffgudehgedvueduvdeifedvvdelhfef heekteefueektdefjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrih hlfhhrohhmpehjihgrgihunhdrhigrnhhgsehflhihghhorghtrdgtohhm X-ME-Proxy: Received: by mailuser.nyi.internal (Postfix, from userid 501) id 3092EFA0AA6; Fri, 3 Dec 2021 06:42:31 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.5.0-alpha0-4458-g51a91c06b2-fm-20211130.004-g51a91c06 Mime-Version: 1.0 Message-Id: In-Reply-To: References: <20211203003636.11417-1-jiaxun.yang@flygoat.com> <822ced92-f165-3c5a-e0bf-dafa6f808b76@intel.com> <27b6387f-fa93-484e-a56e-12452a82f069@www.fastmail.com> Date: Fri, 03 Dec 2021 11:42:10 +0000 From: "Jiaxun Yang" To: "Dave Hansen" , x86@kernel.org Cc: "Thomas Gleixner" , "Ingo Molnar" , bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, chang.seok.bae@intel.com, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 00/10] x86: Allocate AVX512 xstate ondemand Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org =E5=9C=A82021=E5=B9=B412=E6=9C=883=E6=97=A5=E5=8D=81=E4=BA=8C=E6=9C=88 =E4= =B8=8A=E5=8D=8812:58=EF=BC=8CDave Hansen=E5=86=99=E9=81=93=EF=BC=9A > On 12/2/21 4:45 PM, Jiaxun Yang wrote: >> =E5=9C=A82021=E5=B9=B412=E6=9C=883=E6=97=A5=E5=8D=81=E4=BA=8C=E6=9C=88= =E4=B8=8A=E5=8D=8812:40=EF=BC=8CDave Hansen=E5=86=99=E9=81=93=EF=BC=9A >>> On 12/2/21 4:36 PM, Jiaxun Yang wrote: >>>> Also we are going to have heterogeneous processors that >>>> only some cores support AVX512, it can be helpful when >>>> dealing with such processors. >>> Really? Which x86 vendor is doing that? >> Clear lower two bits of MSR 0xAF on Alder Lake give me some suprise := -) > > I honestly don't know what you're talking about. Does poking that MSR > allowing AVX512 instructions to be executed on cores where it was > otherwise disabled? That's entertaining, but it's far from "supported" > or even support*able* in Linux. If it's improper I'll drop the statement in commit message :-) Yep, I'm entertaining with kernel hackcing. Thanks --=20 - Jiaxun