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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 08BCBC17445 for ; Mon, 11 Nov 2019 14:05:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D1C3A21D7F for ; Mon, 11 Nov 2019 14:05:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="Bgw8Z2dG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727069AbfKKOFY (ORCPT ); Mon, 11 Nov 2019 09:05:24 -0500 Received: from mail-qv1-f67.google.com ([209.85.219.67]:35982 "EHLO mail-qv1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726889AbfKKOFY (ORCPT ); Mon, 11 Nov 2019 09:05:24 -0500 Received: by mail-qv1-f67.google.com with SMTP id f12so4908818qvu.3 for ; Mon, 11 Nov 2019 06:05:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=TUlJCeoF38DKIrVWoIThW1y6VPH1GtKS/JV6B3O9+e8=; b=Bgw8Z2dGCYAnlOXhOPDnkhsV3By/I0Z7d7ccWtm1tXqINtmjF4r9crBGOwA312gElP ZZgSr9vVjPOGi06MDhGGOwG+eqKCnnjKUrq4pcXW6QB3+zhieOT4jwQrYDhQwtaU/CJz bwLos1fDgh9ocIxTS0BsZ5deRjRtihP/UhG66iyMXhsHdIYA2oLAV607Vi+lfk2FZCj6 uAhu1UKADe4jAOz1KA4HWC+wkggiNw4PqETA5ozAyYyiu0x1NT+B4Q8HtRXyz9MiZxnF dCr44BHhu4tzalrK2+gzFzlz2k6eSpj7pvGZeZHdkbauLL6St6r4tcIXIBmh3R+3u6KP nJDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=TUlJCeoF38DKIrVWoIThW1y6VPH1GtKS/JV6B3O9+e8=; b=OYxTpDSWwG1qZvyIeDC980jJ5FAvipsfKJiyUcabaDr0FvmeQGvkj7vqT6SvEJuwcM 60tpiDE8cN0uonMhKMU9pP1m+Wu5JkOEeRqqtebp1iPfxCxJ6vNsvPzSqN40lxvPzmgw d1wN07ZPP5tBAq7kcSonl1m4azToRI67dFx/SoweaUpRarJHiIzgtO4Mnarjiz6+rY2a 4lMiN05HsV/ukeqOPLKq3M+YMEBemBZEfK1HtKZrZFV2o2c3vLbJouCs0pQRQpx0CUmS w3pyD43VMkLhdPnq33clRsrHr9p2oOpERQ6EBB/kkhXVuZyy2VtlJjnXiBja1ILMw8LO vasw== X-Gm-Message-State: APjAAAVDZT2UrlHz52UG3p5/MPPqQX7gOgZYAVvBLpER8KH7Ra1KWXly iNhgP38+jCW5SUG/4oG84jEpW+pEri6tGg== X-Google-Smtp-Source: APXvYqzqhrRm/F68CA5PU/mQDVIRouMaJ2axN9SXyskCosIsXv5cShq2L9eqdvDzzBRD/pc3m0W5VQ== X-Received: by 2002:a05:6214:90f:: with SMTP id dj15mr9905628qvb.224.1573481122495; Mon, 11 Nov 2019 06:05:22 -0800 (PST) Received: from [192.168.1.183] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id x11sm9257781qtk.93.2019.11.11.06.05.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Nov 2019 06:05:21 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v2 1/1] iommu/vt-d: Add Kconfig option to enable/disable scalable mode Date: Mon, 11 Nov 2019 09:05:20 -0500 Message-Id: <77EC0C76-22C1-4982-8E0A-9AD7223B3410@lca.pw> References: Cc: Joerg Roedel , David Woodhouse , kevin.tian@intel.com, ashok.raj@intel.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jacob.jun.pan@intel.com In-Reply-To: To: Lu Baolu X-Mailer: iPhone Mail (17A878) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Nov 11, 2019, at 12:23 AM, Lu Baolu wrote: > > The scalable mode is defined in VT-d 3.0. The scalable mode capability > could be checked by reading /sys/devices/virtual/iommu/dmar*/intel- > iommu/ecap. It's currently not friendly for reading. You need to decode > it according to the spec. This looks like some perfect information to put in the Kconfig description.