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 953F8C433E2 for ; Mon, 8 Jun 2020 12:54:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3BD332076A for ; Mon, 8 Jun 2020 12:54:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3BD332076A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A54D76B0003; Mon, 8 Jun 2020 08:54:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A04DF6B0005; Mon, 8 Jun 2020 08:54:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F3E76B0006; Mon, 8 Jun 2020 08:54:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0068.hostedemail.com [216.40.44.68]) by kanga.kvack.org (Postfix) with ESMTP id 752856B0003 for ; Mon, 8 Jun 2020 08:54:37 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 38BB3180C59E8 for ; Mon, 8 Jun 2020 12:54:37 +0000 (UTC) X-FDA: 76906038594.06.voice92_011128e26dba Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id DAF55100410D4 for ; Mon, 8 Jun 2020 12:54:36 +0000 (UTC) X-HE-Tag: voice92_011128e26dba X-Filterd-Recvd-Size: 2537 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Mon, 8 Jun 2020 12:54:35 +0000 (UTC) IronPort-SDR: /dc9bO7DHPOHsTj/e7QA2HDE4HioJ42x0pak5L4pql3G7eH+2oia9KmLMAqppNu5+N/yJA0jPr 3IdIZu93z66g== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.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 X-Rspamd-Queue-Id: DAF55100410D4 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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/d45eb54110944ff9= 5e544972d8bdac1d 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(-) --=20 2.26.2