From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030231Ab3AXUZk (ORCPT ); Thu, 24 Jan 2013 15:25:40 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:26957 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756371Ab3AXUWO (ORCPT ); Thu, 24 Jan 2013 15:22:14 -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 Subject: [PATCH 22/35] x86, kexec: Set ident mapping for kernel that is above max_pfn Date: Thu, 24 Jan 2013 12:20:03 -0800 Message-Id: <1359058816-7615-23-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: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When first kernel is booted with memmap= or mem= to limit max_pfn. kexec can load second kernel above that max_pfn. We need to set ident mapping for whole image in this case instead of just for first 2M. Signed-off-by: Yinghai Lu --- arch/x86/kernel/machine_kexec_64.c | 43 +++++++++++++++++++++++++++++++----- 1 file changed, 37 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index b3ea9db..be14ee1 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -56,6 +56,25 @@ out: return result; } +static int ident_mapping_init(struct kimage *image, pgd_t *level4p, + unsigned long mstart, unsigned long mend) +{ + int result; + + mstart = round_down(mstart, PMD_SIZE); + mend = round_up(mend - 1, PMD_SIZE); + + while (mstart < mend) { + result = init_one_level2_page(image, level4p, mstart); + if (result) + return result; + + mstart += PMD_SIZE; + } + + return 0; +} + static void init_level2_page(pmd_t *level2p, unsigned long addr) { unsigned long end_addr; @@ -184,22 +203,34 @@ err: return result; } - static int init_pgtable(struct kimage *image, unsigned long start_pgtable) { + unsigned long mstart, mend; pgd_t *level4p; int result; + int i; + level4p = (pgd_t *)__va(start_pgtable); result = init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT); if (result) return result; + /* - * image->start may be outside 0 ~ max_pfn, for example when - * jump back to original kernel from kexeced kernel + * segments's mem ranges could be outside 0 ~ max_pfn, + * for example when jump back to original kernel from kexeced kernel. + * or first kernel is booted with user mem map, and second kernel + * could be loaded out of that range. */ - result = init_one_level2_page(image, level4p, image->start); - if (result) - return result; + for (i = 0; i < image->nr_segments; i++) { + mstart = image->segment[i].mem; + mend = mstart + image->segment[i].memsz; + + result = ident_mapping_init(image, level4p, mstart, mend); + + if (result) + return result; + } + return init_transition_pgtable(image, level4p); } -- 1.7.10.4