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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED autolearn=ham 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 ECBFEC43144 for ; Fri, 22 Jun 2018 14:49:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9E671243F8 for ; Fri, 22 Jun 2018 14:49:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="nKc4nGlv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E671243F8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933594AbeFVOt2 (ORCPT ); Fri, 22 Jun 2018 10:49:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:47328 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932819AbeFVOt1 (ORCPT ); Fri, 22 Jun 2018 10:49:27 -0400 Received: from mail-wr0-f182.google.com (mail-wr0-f182.google.com [209.85.128.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C8A87243FA for ; Fri, 22 Jun 2018 14:49:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1529678967; bh=hFHhAZjn3CDgO2D1TP231BOAJv/5b3dIUwD4Po92XIA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=nKc4nGlvtYDd8v2iXoUpGtp6SNg21XOCXodRguE9d/07KbvG+JvH6/AqmpQsVjtbC rmhbxCtld7AUw/VCt2BnuKDBAX+gaFqBIY1lwU/+sAD0SbN1wgwGiSCN1T4eHY5LCT /Vr7zVAvI699e5188cta2zBRfx9JjJuRhHup4sHE= Received: by mail-wr0-f182.google.com with SMTP id l14-v6so1915591wrq.13 for ; Fri, 22 Jun 2018 07:49:26 -0700 (PDT) X-Gm-Message-State: APt69E1qP0rB8DX8qO4njveHwkLFD3LP5eHQAnnGKXV7FuTY1DsBV4vd rEX9b4VN5vkgObxZonJGrFx/wEuAnTCRnNffUEdHgA== X-Google-Smtp-Source: AAOMgpfAbrF9odZ94siL9qnU2H+LyDWRegx5d1K9x6N2AhDdoj2CUqMpJgXnA9781kjFPCSLcRtHir521KyJPyw2qao= X-Received: by 2002:adf:b1c2:: with SMTP id r2-v6mr1750804wra.221.1529678965320; Fri, 22 Jun 2018 07:49:25 -0700 (PDT) MIME-Version: 1.0 References: <20180621211754.12757-1-h.peter.anvin@intel.com> <20180621211754.12757-8-h.peter.anvin@intel.com> In-Reply-To: <20180621211754.12757-8-h.peter.anvin@intel.com> From: Andy Lutomirski Date: Fri, 22 Jun 2018 07:49:13 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v3 7/7] x86/ldt,ptrace: provide regset access to the LDT To: "H. Peter Anvin" Cc: LKML , "H. Peter Anvin" , "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , Andrew Lutomirski , "Bae, Chang Seok" , "Metzger, Markus T" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 21, 2018 at 2:18 PM H. Peter Anvin, Intel wrote: > > From: "H. Peter Anvin" > > Provide ptrace/regset access to the LDT, if one exists. This > interface provides both read and write access. The write code is > unified with modify_ldt(); the read code doesn't have enough > similarity so it has been kept made separate. For this and for the GDT, you've chosen to use struct user_desc as your format instead of using a native hardware descriptor format. Any particular reason why? If nothing else, it will bloat core files a bit more than needed.