From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756306Ab3AXUWB (ORCPT ); Thu, 24 Jan 2013 15:22:01 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:49970 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030228Ab3AXUVR (ORCPT ); Thu, 24 Jan 2013 15:21:17 -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 , Alexander Duyck , Fenghua Yu Subject: [PATCH 08/35] x86, 64bit: Copy zero-page early Date: Thu, 24 Jan 2013 12:19:49 -0800 Message-Id: <1359058816-7615-9-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: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org real mode data/boot_params aka zero-page could be above 4g. We will have #PF handler to set page table for not accessible ram early, but want to limit it before x86_64_start_reservations to limit the code change to native path only. Also we will need the ramdisk info in zero-page to access the microcode blob in ramdisk in x86_64_start_kernel, so copy zero-page early makes it accessing ramdisk info simple. Signed-off-by: Yinghai Lu Cc: Alexander Duyck Cc: Fenghua Yu --- arch/x86/kernel/head64.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 7b215a5..c0a25e0 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -87,6 +87,8 @@ void __init x86_64_start_kernel(char * real_mode_data) } load_idt((const struct desc_ptr *)&idt_descr); + copy_bootdata(__va(real_mode_data)); + if (console_loglevel == 10) early_printk("Kernel alive\n"); @@ -95,7 +97,9 @@ void __init x86_64_start_kernel(char * real_mode_data) void __init x86_64_start_reservations(char *real_mode_data) { - copy_bootdata(__va(real_mode_data)); + /* version is always not zero if it is copied */ + if (!boot_params.hdr.version) + copy_bootdata(__va(real_mode_data)); memblock_reserve(__pa_symbol(_text), (unsigned long)__bss_stop - (unsigned long)_text); -- 1.7.10.4