From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f197.google.com (mail-wr0-f197.google.com [209.85.128.197]) by kanga.kvack.org (Postfix) with ESMTP id 4CDBA6B0003 for ; Sun, 11 Feb 2018 06:37:13 -0500 (EST) Received: by mail-wr0-f197.google.com with SMTP id h13so7372030wrc.9 for ; Sun, 11 Feb 2018 03:37:13 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id x131sor712259wmb.58.2018.02.11.03.37.11 for (Google Transport Security); Sun, 11 Feb 2018 03:37:11 -0800 (PST) Date: Sun, 11 Feb 2018 12:37:08 +0100 From: Ingo Molnar Subject: Re: [PATCHv9 0/4] x86: 5-level related changes into decompression code Message-ID: <20180211113708.mtloh22id57nn32g@gmail.com> References: <20180209142228.21231-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180209142228.21231-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Ingo Molnar , x86@kernel.org, Thomas Gleixner , "H. Peter Anvin" , Linus Torvalds , Andy Lutomirski , Cyrill Gorcunov , Borislav Petkov , Andi Kleen , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org * Kirill A. Shutemov wrote: > These patcheset is a preparation for boot-time switching between paging > modes. Please apply. > > The first patch is pure cosmetic change: it gives file with KASLR helpers > a proper name. > > The last three patches bring support of booting into 5-level paging mode if > a bootloader put the kernel above 4G. > > Patch 2/4 Renames l5_paging_required() into paging_prepare() and change > interface of the function. > Patch 3/4 Handles allocation of space for trampoline and gets it prepared. > Patch 4/4 Gets trampoline used. > > v9: > - Patch 3 now saves and restores lowmem used for trampoline. > > There was report the patch causes issue on a machine. I suspect it's > BIOS issue that doesn't report proper bounds of usable lowmem. > > Restoring memory back to oringinal state makes problem go away. > v8: > - Support switching from 5- to 4-level paging. > v7: > - Fix booting when 5-level paging is enabled before handing off boot to > the kernel, like in kexec() case. > > Kirill A. Shutemov (4): > x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c > x86/boot/compressed/64: Introduce paging_prepare() > x86/boot/compressed/64: Prepare trampoline memory > x86/boot/compressed/64: Handle 5-level paging boot if kernel is above > 4G > > arch/x86/boot/compressed/Makefile | 2 +- > arch/x86/boot/compressed/head_64.S | 178 ++++++++++++++------- > .../boot/compressed/{pagetable.c => kaslr_64.c} | 0 > arch/x86/boot/compressed/pgtable.h | 18 +++ > arch/x86/boot/compressed/pgtable_64.c | 100 ++++++++++-- > 5 files changed, 232 insertions(+), 66 deletions(-) > rename arch/x86/boot/compressed/{pagetable.c => kaslr_64.c} (100%) > create mode 100644 arch/x86/boot/compressed/pgtable.h Ok, this series looks pretty good - I've applied it to tip:x86/boot for an eventual 4.17 merge and will push it out if it passes local testing. Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org