From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751562Ab2KPIxk (ORCPT ); Fri, 16 Nov 2012 03:53:40 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:22796 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751353Ab2KPIxf (ORCPT ); Fri, 16 Nov 2012 03:53:35 -0500 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: linux-kernel@vger.kernel.org, Yinghai Lu , "Eric W. Biederman" Subject: [PATCH 3/9] x86, 64bit: set extra ident page table for whole kernel range Date: Fri, 16 Nov 2012 00:53:03 -0800 Message-Id: <1353055989-31939-4-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1353055989-31939-1-git-send-email-yinghai@kernel.org> References: <1353055989-31939-1-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 Current when kernel is loaded above 1G, only [_text, _text+2M] is set up with extra ident page table. That is not enough, some variables that could be used early are out of that range. (like gdt...) Just set map with [_text, _end] for all text/data/bss/brk... Signed-off-by: Yinghai Lu Cc: "Eric W. Biederman" --- arch/x86/kernel/head_64.S | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 94bf9cc..efc0c08 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -115,7 +115,16 @@ startup_64: andq $(PTRS_PER_PMD - 1), %rax leaq __PAGE_KERNEL_IDENT_LARGE_EXEC(%rdi), %rdx leaq level2_spare_pgt(%rip), %rbx - movq %rdx, 0(%rbx, %rax, 8) + leaq _end(%rip), %r8 + decq %r8 + shrq $PMD_SHIFT, %r8 + andq $(PTRS_PER_PMD - 1), %r8 +1: movq %rdx, 0(%rbx, %rax, 8) + addq $PMD_SIZE, %rdx + incq %rax + cmp %r8, %rax + jle 1b + ident_complete: /* -- 1.7.7