From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933284AbdLRLyf (ORCPT ); Mon, 18 Dec 2017 06:54:35 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:45341 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933253AbdLRLyc (ORCPT ); Mon, 18 Dec 2017 06:54:32 -0500 Message-Id: <20171218115256.731524766@linutronix.de> User-Agent: quilt/0.63-1 Date: Mon, 18 Dec 2017 12:42:53 +0100 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Linus Torvalds , Andy Lutomirsky , Peter Zijlstra , Dave Hansen , Borislav Petkov , Greg KH , keescook@google.com, hughd@google.com, Brian Gerst , Josh Poimboeuf , Denys Vlasenko , Rik van Riel , Boris Ostrovsky , Juergen Gross , David Laight , Eduardo Valentin , aliguori@amazon.com, Will Deacon , daniel.gruss@iaik.tugraz.at, Kees Cook , Borislav Petkov , "Kirill A. Shutemov" Subject: [patch V163 38/51] x86/mm/64: Make a full PGD-entry size hole in the memory map References: <20171218114215.239543034@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Disposition: inline; filename=x86-mm-64--Make_a_full_PGD-entry_size_hole_in_the_memory_map.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andy Lutomirski Shrink vmalloc space from 16384TiB to 12800TiB to enlarge the hole starting at 0xff90000000000000 to be a full PGD entry. A subsequent patch will use this hole for the pagetable isolation LDT alias. Signed-off-by: Andy Lutomirski Signed-off-by: Thomas Gleixner Cc: Kees Cook Cc: Peter Zijlstra Cc: Brian Gerst Cc: Dave Hansen Cc: David Laight Cc: Borislav Petkov Cc: "Kirill A. Shutemov" --- Documentation/x86/x86_64/mm.txt | 4 ++-- arch/x86/include/asm/pgtable_64_types.h | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -28,8 +28,8 @@ ffffffffffe00000 - ffffffffffffffff (=2 hole caused by [56:63] sign extension ff00000000000000 - ff0fffffffffffff (=52 bits) guard hole, reserved for hypervisor ff10000000000000 - ff8fffffffffffff (=55 bits) direct mapping of all phys. memory -ff90000000000000 - ff91ffffffffffff (=49 bits) hole -ff92000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space +ff90000000000000 - ff9fffffffffffff (=52 bits) hole +ffa0000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space (12800 TB) ffd2000000000000 - ffd3ffffffffffff (=49 bits) hole ffd4000000000000 - ffd5ffffffffffff (=49 bits) virtual memory map (512TB) ... unused hole ... --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -78,8 +78,8 @@ typedef struct { pteval_t pte; } pte_t; /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */ #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL) #ifdef CONFIG_X86_5LEVEL -#define VMALLOC_SIZE_TB _AC(16384, UL) -#define __VMALLOC_BASE _AC(0xff92000000000000, UL) +#define VMALLOC_SIZE_TB _AC(12800, UL) +#define __VMALLOC_BASE _AC(0xffa0000000000000, UL) #define __VMEMMAP_BASE _AC(0xffd4000000000000, UL) #else #define VMALLOC_SIZE_TB _AC(32, UL)