Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752740AbbK2JHJ (ORCPT ); Sun, 29 Nov 2015 04:07:09 -0500 Received: from terminus.zytor.com ([198.137.202.10]:40584 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751837AbbK2JGa (ORCPT ); Sun, 29 Nov 2015 04:06:30 -0500 Date: Sun, 29 Nov 2015 01:05:24 -0800 From: tip-bot for Matt Fleming Message-ID: Cc: sai.praneeth.prakhya@intel.com, ard.biesheuvel@linaro.org, hpa@zytor.com, toshi.kani@hp.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, bp@alien8.de, mingo@kernel.org, tglx@linutronix.de, peterz@infradead.org, brgerst@gmail.com, luto@kernel.org, sds@tycho.nsa.gov, akpm@linux-foundation.org, bp@suse.de, luto@amacapital.net, dvlasenk@redhat.com, davej@codemonkey.org.uk, matt@codeblueprint.co.uk Reply-To: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, toshi.kani@hp.com, hpa@zytor.com, ard.biesheuvel@linaro.org, sai.praneeth.prakhya@intel.com, matt@codeblueprint.co.uk, davej@codemonkey.org.uk, dvlasenk@redhat.com, bp@suse.de, luto@amacapital.net, akpm@linux-foundation.org, sds@tycho.nsa.gov, brgerst@gmail.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, bp@alien8.de, mingo@kernel.org In-Reply-To: <1448658575-17029-7-git-send-email-matt@codeblueprint.co.uk> References: <1448658575-17029-7-git-send-email-matt@codeblueprint.co.uk> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/efi] Documentation/x86: Update EFI memory region description Git-Commit-ID: ff3d0a12fb2dc123e2b46e9524ebf4e08de5c59c 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 Content-Length: 3294 Lines: 76 Commit-ID: ff3d0a12fb2dc123e2b46e9524ebf4e08de5c59c Gitweb: http://git.kernel.org/tip/ff3d0a12fb2dc123e2b46e9524ebf4e08de5c59c Author: Matt Fleming AuthorDate: Fri, 27 Nov 2015 21:09:35 +0000 Committer: Ingo Molnar CommitDate: Sun, 29 Nov 2015 09:15:43 +0100 Documentation/x86: Update EFI memory region description Make it clear that the EFI page tables are only available during EFI runtime calls since that subject has come up a fair numbers of times in the past. Additionally, add the EFI region start and end addresses to the table so that it's possible to see at a glance where they fall in relation to other regions. Signed-off-by: Matt Fleming Reviewed-by: Borislav Petkov Acked-by: Borislav Petkov Cc: Andrew Morton Cc: Andy Lutomirski Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Borislav Petkov Cc: Brian Gerst Cc: Dave Jones Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Sai Praneeth Prakhya Cc: Stephen Smalley Cc: Thomas Gleixner Cc: Toshi Kani Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1448658575-17029-7-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar --- Documentation/x86/x86_64/mm.txt | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index 05712ac..c518dce 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -16,6 +16,8 @@ ffffec0000000000 - fffffc0000000000 (=44 bits) kasan shadow memory (16TB) ... unused hole ... ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks ... unused hole ... +ffffffef00000000 - ffffffff00000000 (=64 GB) EFI region mapping space +... unused hole ... ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0 ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls @@ -32,11 +34,9 @@ reference. Current X86-64 implementations only support 40 bits of address space, but we support up to 46 bits. This expands into MBZ space in the page tables. -->trampoline_pgd: - -We map EFI runtime services in the aforementioned PGD in the virtual -range of 64Gb (arbitrarily set, can be raised if needed) - -0xffffffef00000000 - 0xffffffff00000000 +We map EFI runtime services in the 'efi_pgd' PGD in a 64Gb large virtual +memory window (this size is arbitrary, it can be raised later if needed). +The mappings are not part of any other kernel PGD and are only available +during EFI runtime calls. -Andi Kleen, Jul 2004 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/