From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756544Ab3AXUXf (ORCPT ); Thu, 24 Jan 2013 15:23:35 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:26971 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756390Ab3AXUWP (ORCPT ); Thu, 24 Jan 2013 15:22:15 -0500 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: "Eric W. Biederman" , Andrew Morton , Jan Kiszka , Jason Wessel , Borislav Petkov , linux-kernel@vger.kernel.org, Yinghai Lu , Zachary Amsden , Matt Fleming Subject: [PATCH 20/35] x86, boot: Move lldt/ltr out of 64bit code section Date: Thu, 24 Jan 2013 12:20:01 -0800 Message-Id: <1359058816-7615-21-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1359058816-7615-1-git-send-email-yinghai@kernel.org> References: <1359058816-7615-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit 08da5a2ca x86_64: Early segment setup for VT sets up LDT and TR into a valid state in order to speed up boot decompression under VT. Those code are put in code64, and it is using GDT that is only loaded from code32 path. That breaks booting with 64bit bootloader that does not go through code32 path and jump to startup_64 directly, and it has different GDT. Move those lines into code32 after their GDT is loaded. Signed-off-by: Yinghai Lu Cc: Zachary Amsden Cc: Matt Fleming --- arch/x86/boot/compressed/head_64.S | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index fb984c0..5c80b94 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -154,6 +154,12 @@ ENTRY(startup_32) btsl $_EFER_LME, %eax wrmsr + /* After gdt is loaded */ + xorl %eax, %eax + lldt %ax + movl $0x20, %eax + ltr %ax + /* * Setup for the jump to 64bit mode * @@ -239,9 +245,6 @@ preferred_addr: movl %eax, %ss movl %eax, %fs movl %eax, %gs - lldt %ax - movl $0x20, %eax - ltr %ax /* * Compute the decompressed kernel start address. It is where -- 1.7.10.4