Received: by 2002:a05:6a10:1d13:0:0:0:0 with SMTP id pp19csp1337379pxb; Fri, 20 Aug 2021 03:24:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy/jIAZmkmNeMcjjbesvTTfzXC00ifyMaKf+ZMZSiqiuqu98MBl0og7LL4OtURvzAynNFVq X-Received: by 2002:a17:906:7749:: with SMTP id o9mr21312287ejn.141.1629455070656; Fri, 20 Aug 2021 03:24:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1629455070; cv=none; d=google.com; s=arc-20160816; b=GKq0nE0U9IFOUMlG2Jbn6/idwOgRQ9u3S3Y7A9aBqMJ5J6PYLpop+E2OF1+cg9AZn0 /o7evOwmqexZLWnGeYvaDMRgfwhtiP0Vky9P9ohGhCxt4g+n+rfACkj70LGyCrBaqvJe X4OsRXsNmiv+Taox15Diz0WtVGX490cx28n7oEtlGf5904icHUZ8a6JoaCSQchH2nXVe bnP73CmbjLzu7yXhZJ12zz2wusQTrZv2IPPL1puOo1WCUSOS3DFpB9LjqQDDdIMgljtl NbIirqer3N4nTilIc4Y5Bbh4WnXCXp0+Qz1/yaPSFHBHBf+NzpngZAvAEZUToNJbsm+d FjCQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date; bh=1N10TJdReCyY7YS30mdq51wkJOL+EzEI8dcX/HKUqi0=; b=he9vgFTzQvuk73R+QJXDNHEJtaxPobM6Ebzumwd3gyMq34KQlvmWOmBI2nLmShF7hO K0gAA106MZmOj8/gsIVjZ2W5TbufRMrBZImE1T4WVed77fDms5iKqmBfyL+Pez9duRK8 ai7+/+0+76MAOysTbI6yfG5LvCiNCxjULnv62xMKYboR5SiCYQ/B1yyllxyEAb9s/C6V DzuZ97pS2iHW/viuTc01Fz1vfVnjgz3iRAkBD1brLMr0EVqIMDhJOzBvRsnF1hx8xlfF pJJ5B6QrS0mPN6BozON9AhPRgUluJtmR5p22Li4d6UYxjfd/sKzHYED5YnzfayQ3gjy+ 6ZGQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id y1si6495786eda.58.2021.08.20.03.23.54; Fri, 20 Aug 2021 03:24:30 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239040AbhHTKUh (ORCPT + 99 others); Fri, 20 Aug 2021 06:20:37 -0400 Received: from 8bytes.org ([81.169.241.247]:38046 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232572AbhHTKUg (ORCPT ); Fri, 20 Aug 2021 06:20:36 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 0BD9F309; Fri, 20 Aug 2021 12:19:56 +0200 (CEST) Date: Fri, 20 Aug 2021 12:19:50 +0200 From: 'Joerg Roedel' To: David Laight Cc: "x86@kernel.org" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "hpa@zytor.com" , Joerg Roedel , Kees Cook , Andy Lutomirski , Uros Bizjak , Arvind Sankar , Ard Biesheuvel , "linux-kernel@vger.kernel.org" , Fabio Aiuto , "stable@vger.kernel.org" Subject: Re: [PATCH] x86/efi: Restore Firmware IDT in before ExitBootServices() Message-ID: References: <20210820073429.19457-1-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 20, 2021 at 09:02:46AM +0000, David Laight wrote: > So allocate and initialise the Linux IDT - so entries can be added. > But don't execute 'lidt' until later on. The IDT is needed in this path to handle #VC exceptions caused by CPUID instructions. So loading the IDT later is not an option. Regards, Joerg