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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CD373C433E0 for ; Wed, 15 Jul 2020 01:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A793F20674 for ; Wed, 15 Jul 2020 01:26:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="aGa5ZBgH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728081AbgGOB0B (ORCPT ); Tue, 14 Jul 2020 21:26:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726356AbgGOB0A (ORCPT ); Tue, 14 Jul 2020 21:26:00 -0400 Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B0EDC061755 for ; Tue, 14 Jul 2020 18:26:00 -0700 (PDT) Received: by mail-pf1-x441.google.com with SMTP id s26so672622pfm.4 for ; Tue, 14 Jul 2020 18:26:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=//8Ju0FArBc4zb01MxBoUcI/VYVDSlzg+BW3vSvSIkE=; b=aGa5ZBgHdWlGrdfvyqG//oW9uMRL8c4lif5pE5f9n31J0nGMfTfTLdQH8s0aTTbj5E XseYVdFj/m/ggc4SYgZzFFvS4yWNkLyoDsxCgYX3tfj9qjanEQCxrddTm1aZfG0VbwNO xgWTY5KoMFbPTRNg4DxovW5nmKheMJSQTsCOE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=//8Ju0FArBc4zb01MxBoUcI/VYVDSlzg+BW3vSvSIkE=; b=nzAP7CFZe4se+g2hBiPra58z3H/8WLh/GHAlZnTXRYhHmib7MxJXMM6mi8S1mDdnCs DlNKzlLnda4Ynp+7zdLpXUezRNXaUR3afOF3HKz4zkA8MNV72uGd9tZ0ck3AgrZjYKfn RLqbYdNRIGcPql9dWvdHcFo353HuvfhU+qbknQMadEslh7CyclTB+PRO7AJQFxQj6Bmw AV9XOKb8i9bca/6nL7atbRpj1p/pAKrpoIHMxSVnwHEv2NGrb3AK5H6jV4kiCw4SVwWz UWMWFndTZ639kTvNyoPcb/+e78gxyU290NAdppjo+07Tfey9yYzutfGcXeLYtwJiBHx+ GNtw== X-Gm-Message-State: AOAM530rpC5+vzBHFA/k5NA4PNt6wXP1RrK4U1bf7hesG4r9QBYom00L zFi1MMbAk3XYbdGEpsA2dS69dg== X-Google-Smtp-Source: ABdhPJzLdhmv/sgESdhBL5NEfWWnipaR1+RTxq1oQwAzUR+7rkRLawIsRncUD/eUpdU7XimBXhr5BQ== X-Received: by 2002:a63:5004:: with SMTP id e4mr5816911pgb.208.1594776360077; Tue, 14 Jul 2020 18:26:00 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id l23sm246555pjy.45.2020.07.14.18.25.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jul 2020 18:25:59 -0700 (PDT) Date: Tue, 14 Jul 2020 18:25:58 -0700 From: Kees Cook To: Joerg Roedel Cc: x86@kernel.org, Joerg Roedel , hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v4 27/75] x86/idt: Move IDT to data segment Message-ID: <202007141825.7A90799@keescook> References: <20200714120917.11253-1-joro@8bytes.org> <20200714120917.11253-28-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200714120917.11253-28-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 14, 2020 at 02:08:29PM +0200, Joerg Roedel wrote: > From: Joerg Roedel > > With SEV-ES, exception handling is needed very early, even before the > kernel has cleared the bss segment. In order to prevent clearing the > currently used IDT, move the IDT to the data segment. > > Signed-off-by: Joerg Roedel Reviewed-by: Kees Cook -- Kees Cook