From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753107AbdKXJP3 (ORCPT ); Fri, 24 Nov 2017 04:15:29 -0500 Received: from mail-wm0-f66.google.com ([74.125.82.66]:38665 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752711AbdKXJPV (ORCPT ); Fri, 24 Nov 2017 04:15:21 -0500 X-Google-Smtp-Source: AGs4zMZw4qFlhmL4SvkC1X1bM/LeXO2QXY8GzQKPDGuCIK/sZAfqwSdk4f1Ud5mLDMha3Igl3Z2rQQ== From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Dave Hansen , Andy Lutomirski , Thomas Gleixner , "H . Peter Anvin" , Peter Zijlstra , Borislav Petkov , Linus Torvalds Subject: [PATCH 04/43] x86/gdt: Put per-cpu GDT remaps in ascending order Date: Fri, 24 Nov 2017 10:14:09 +0100 Message-Id: <20171124091448.7649-5-mingo@kernel.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20171124091448.7649-1-mingo@kernel.org> References: <20171124091448.7649-1-mingo@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andy Lutomirski We currently have CPU 0's GDT at the top of the GDT range and higher-numbered CPUs at lower addresses. This happens because the fixmap is upside down (index 0 is the top of the fixmap). Flip it so that GDTs are in ascending order by virtual address. This will simplify a future patch that will generalize the GDT remap to contain multiple pages. Signed-off-by: Andy Lutomirski Reviewed-by: Borislav Petkov Reviewed-by: Thomas Gleixner Cc: Borislav Petkov Cc: Borislav Petkov Cc: Brian Gerst Cc: Dave Hansen Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/3966a6edf6fd45deca4cf52a9b9276402499dda9.1511497875.git.luto@kernel.org Signed-off-by: Ingo Molnar --- arch/x86/include/asm/desc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index 4011cb03ef08..95cd95eb7285 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -63,7 +63,7 @@ static inline struct desc_struct *get_current_gdt_rw(void) /* Get the fixmap index for a specific processor */ static inline unsigned int get_cpu_gdt_ro_index(int cpu) { - return FIX_GDT_REMAP_BEGIN + cpu; + return FIX_GDT_REMAP_END - cpu; } /* Provide the fixmap address of the remapped GDT */ -- 2.14.1