From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756929AbaISLsv (ORCPT ); Fri, 19 Sep 2014 07:48:51 -0400 Received: from terminus.zytor.com ([198.137.202.10]:56307 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754045AbaISLst (ORCPT ); Fri, 19 Sep 2014 07:48:49 -0400 Date: Fri, 19 Sep 2014 04:48:37 -0700 From: tip-bot for Dave Hansen Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, ryabinin.a.a@gmail.com, dvyukov@google.com, dave.hansen@linux.intel.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, ryabinin.a.a@gmail.com, tglx@linutronix.de, dave.hansen@linux.intel.com, dvyukov@google.com In-Reply-To: <20140918195606.841389D2@viggo.jf.intel.com> References: <20140918195606.841389D2@viggo.jf.intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm] x86/mm: Update memory map description to list hypervisor-reserved area Git-Commit-ID: beb9147e95a75f41c984d7235cf6d59f3ca2d5db X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: beb9147e95a75f41c984d7235cf6d59f3ca2d5db Gitweb: http://git.kernel.org/tip/beb9147e95a75f41c984d7235cf6d59f3ca2d5db Author: Dave Hansen AuthorDate: Thu, 18 Sep 2014 12:56:06 -0700 Committer: Ingo Molnar CommitDate: Fri, 19 Sep 2014 12:48:02 +0200 x86/mm: Update memory map description to list hypervisor-reserved area Peter Anvin says: > 0xffff880000000000 is the lowest usable address because we have > agreed to leave 0xffff800000000000-0xffff880000000000 for the > hypervisor or other non-OS uses. Let's call this out in the documentation. This came up during the kernel address sanitizer discussions where it was proposed to use this area for other kernel things. Signed-off-by: Dave Hansen Cc: Andrey Ryabinin Cc: Dmitry Vyukov Link: http://lkml.kernel.org/r/20140918195606.841389D2@viggo.jf.intel.com Signed-off-by: Ingo Molnar --- Documentation/x86/x86_64/mm.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index afe68dd..052ee64 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -5,7 +5,7 @@ Virtual memory map with 4 level page tables: 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension -ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole +ffff800000000000 - ffff87ffffffffff (=43 bits) guard hole, reserved for hypervisor ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space