From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C21B9C433E3 for ; Mon, 8 Jun 2020 12:54:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A81472076A for ; Mon, 8 Jun 2020 12:54:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729862AbgFHMyh (ORCPT ); Mon, 8 Jun 2020 08:54:37 -0400 Received: from mga11.intel.com ([192.55.52.93]:47795 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729844AbgFHMyf (ORCPT ); Mon, 8 Jun 2020 08:54:35 -0400 IronPort-SDR: 4zCeo/Gu/l11k6LvMtnkJ9eYHSdx6u2gYck4Bxrv75QiLPh8rR4yY4bqyuFrNefAzASTu3q46U V2j0Pok1NPUA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2020 05:54:34 -0700 IronPort-SDR: x66KGXaPNNEaV3zpLIrWlHsD7kGIHT9bFjM06CXGMcX4rRaMM90o9OXGsj7bxVwD0UlZcnZ4As SSQlJhb+ro7w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,487,1583222400"; d="scan'208";a="379410653" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 08 Jun 2020 05:54:31 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id 9E9251BC; Mon, 8 Jun 2020 15:54:30 +0300 (EEST) From: "Kirill A. Shutemov" To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" Cc: Dan Williams , Tony Luck , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv2 0/2] x86: Fix boot with some memory above MAXMEM Date: Mon, 8 Jun 2020 15:54:22 +0300 Message-Id: <20200608125424.70198-1-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.27.0.rc2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A 5-level paging capable machine can have memory above 46-bit in the physical address space. This memory is only addressable in the 5-level paging mode: we don't have enough virtual address space to create direct mapping for such memory in the 4-level paging mode. Tested with a hacked QEMU: https://gist.github.com/kiryl/d45eb54110944ff95e544972d8bdac1d v2: - Fix boot with KASLR enabled on such machines; - Better error message; Kirill A. Shutemov (2): x86/mm: Fix boot with some memory above MAXMEM x86/boot/KASLR: Fix boot with some memory above MAXMEM arch/x86/boot/compressed/kaslr.c | 11 +++++++++++ arch/x86/kernel/e820.c | 24 ++++++++++++++++++++++-- 2 files changed, 33 insertions(+), 2 deletions(-) -- 2.26.2