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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 8AEF1C4332B for ; Thu, 19 Mar 2020 09:18:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FE4420722 for ; Thu, 19 Mar 2020 09:18:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727518AbgCSJSg (ORCPT ); Thu, 19 Mar 2020 05:18:36 -0400 Received: from 8bytes.org ([81.169.241.247]:52420 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727324AbgCSJOe (ORCPT ); Thu, 19 Mar 2020 05:14:34 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id F1A6B4F1; Thu, 19 Mar 2020 10:14:20 +0100 (CET) From: Joerg Roedel To: x86@kernel.org Cc: hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Thomas Hellstrom , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, Joerg Roedel , Joerg Roedel Subject: [PATCH 26/70] x86/idt: Move IDT to data segment Date: Thu, 19 Mar 2020 10:13:23 +0100 Message-Id: <20200319091407.1481-27-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200319091407.1481-1-joro@8bytes.org> References: <20200319091407.1481-1-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- arch/x86/kernel/idt.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index 87ef69a72c52..a8fc01ea602a 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -165,8 +165,12 @@ static const __initconst struct idt_data dbg_idts[] = { }; #endif -/* Must be page-aligned because the real IDT is used in a fixmap. */ -gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss; +/* + * Must be page-aligned because the real IDT is used in a fixmap. + * Also needs to be in the .data segment, because the idt_table is + * needed before the kernel clears the .bss segment. + */ +gate_desc idt_table[IDT_ENTRIES] __page_aligned_data; struct desc_ptr idt_descr __ro_after_init = { .size = (IDT_ENTRIES * 2 * sizeof(unsigned long)) - 1, -- 2.17.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 26/70] x86/idt: Move IDT to data segment Date: Thu, 19 Mar 2020 10:13:23 +0100 Message-ID: <20200319091407.1481-27-joro@8bytes.org> References: <20200319091407.1481-1-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20200319091407.1481-1-joro@8bytes.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: x86@kernel.org Cc: Juergen Gross , Tom Lendacky , Thomas Hellstrom , Joerg Roedel , Kees Cook , kvm@vger.kernel.org, Peter Zijlstra , Joerg Roedel , Dave Hansen , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Andy Lutomirski , hpa@zytor.com, Dan Williams , Jiri Slaby List-Id: virtualization@lists.linuxfoundation.org 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 --- arch/x86/kernel/idt.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index 87ef69a72c52..a8fc01ea602a 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -165,8 +165,12 @@ static const __initconst struct idt_data dbg_idts[] = { }; #endif -/* Must be page-aligned because the real IDT is used in a fixmap. */ -gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss; +/* + * Must be page-aligned because the real IDT is used in a fixmap. + * Also needs to be in the .data segment, because the idt_table is + * needed before the kernel clears the .bss segment. + */ +gate_desc idt_table[IDT_ENTRIES] __page_aligned_data; struct desc_ptr idt_descr __ro_after_init = { .size = (IDT_ENTRIES * 2 * sizeof(unsigned long)) - 1, -- 2.17.1