From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f69.google.com (mail-pg0-f69.google.com [74.125.83.69]) by kanga.kvack.org (Postfix) with ESMTP id 1F9F0280405 for ; Mon, 21 Aug 2017 11:30:27 -0400 (EDT) Received: by mail-pg0-f69.google.com with SMTP id t3so44243896pgt.5 for ; Mon, 21 Aug 2017 08:30:27 -0700 (PDT) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTPS id d127si3724566pga.4.2017.08.21.08.30.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Aug 2017 08:30:25 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv5 00/19] Boot-time switching between 4- and 5-level paging Date: Mon, 21 Aug 2017 18:28:57 +0300 Message-Id: <20170821152916.40124-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Andrew Morton , Andy Lutomirski , Dmitry Safonov , Cyrill Gorcunov , Borislav Petkov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" The basic idea is to implement the same logic as pgtable-nop4d.h provides, but at runtime. Runtime folding is only implemented for CONFIG_X86_5LEVEL=y case. With the option disabled, we do compile-time folding as before.. Initially, I tried to fold pgd instread. I've got to shell, but it required a lot of hacks as kernel threats pgd in a special way. Please review and consider applying. v5: - Split changes into more patches; - Rename p4d_folded to pgtable_l5_enabled and reverse logic around it; - Update commit messages to reflect effect on kernel image size; v4: - Use ALTERNATIVE to patch return_from_SYSCALL_64 (Andi); - Use __read_mostly where appropriate (Andi); - Make X86_5LEVEL dependant on SPARSEMEM_VMEMMAP; - Fix build errors and warnings; v3: - Make sparsemem data stuctures allocation dynamic to lower memory overhead on 4-level paging machines; - Allow XEN_PV and XEN_PVH to be enabled with X86_5LEVEL; - XEN cleanups; Kirill A. Shutemov (19): mm/sparsemem: Allocate mem_section at runtime for SPARSEMEM_EXTREME mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS x86/kasan: Use the same shadow offset for 4- and 5-level paging x86/xen: Provide pre-built page tables only for XEN_PV and XEN_PVH x86/xen: Drop 5-level paging support code from XEN_PV code x86/boot/compressed/64: Detect and handle 5-level paging at boot-time x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable x86/mm: Make MAX_PHYSADDR_BITS and MAX_PHYSMEM_BITS dynamic x86/mm: Make __PHYSICAL_MASK_SHIFT and __VIRTUAL_MASK_SHIFT dynamic x86/mm: Make STACK_TOP_MAX dynamic x86/mm: Adjust virtual address space layout in early boot. x86/mm: Make early boot code support boot-time switching of paging modes x86/mm: Fold p4d page table layer at runtime x86/mm: Replace compile-time checks for 5-level with runtime-time x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y x86/xen: Allow XEN_PV and XEN_PVH to be enabled with X86_5LEVEL x86/mm: Redefine some of page table helpers as macros x86/mm: Offset boot-time paging mode switching cost Documentation/x86/x86_64/5level-paging.txt | 9 +- arch/x86/Kconfig | 6 +- arch/x86/boot/compressed/head_64.S | 24 ++++ arch/x86/boot/compressed/kaslr.c | 14 +++ arch/x86/boot/compressed/misc.h | 5 + arch/x86/entry/entry_64.S | 5 + arch/x86/include/asm/kaslr.h | 4 - arch/x86/include/asm/page_64.h | 4 + arch/x86/include/asm/page_64_types.h | 15 +-- arch/x86/include/asm/paravirt.h | 21 ++-- arch/x86/include/asm/pgalloc.h | 5 +- arch/x86/include/asm/pgtable.h | 10 +- arch/x86/include/asm/pgtable_32.h | 2 + arch/x86/include/asm/pgtable_32_types.h | 2 + arch/x86/include/asm/pgtable_64_types.h | 53 ++++++--- arch/x86/include/asm/pgtable_types.h | 67 +++-------- arch/x86/include/asm/processor.h | 2 +- arch/x86/include/asm/required-features.h | 8 +- arch/x86/include/asm/sparsemem.h | 9 +- arch/x86/kernel/Makefile | 3 +- arch/x86/kernel/head64.c | 81 +++++++++++-- arch/x86/kernel/head_64.S | 29 +++-- arch/x86/kernel/setup.c | 5 +- arch/x86/mm/dump_pagetables.c | 20 ++-- arch/x86/mm/fault.c | 2 +- arch/x86/mm/ident_map.c | 2 +- arch/x86/mm/init_64.c | 32 ++--- arch/x86/mm/kasan_init_64.c | 98 ++++++++++++---- arch/x86/mm/kaslr.c | 27 ++--- arch/x86/platform/efi/efi_64.c | 6 +- arch/x86/power/hibernate_64.c | 6 +- arch/x86/xen/Kconfig | 5 - arch/x86/xen/mmu_pv.c | 180 +++++++++++++---------------- include/asm-generic/5level-fixup.h | 1 + include/asm-generic/pgtable-nop4d.h | 1 + include/linux/kasan.h | 2 +- include/linux/mmzone.h | 6 +- mm/kasan/kasan_init.c | 2 +- mm/page_alloc.c | 10 ++ mm/sparse.c | 17 ++- mm/zsmalloc.c | 6 + 41 files changed, 483 insertions(+), 323 deletions(-) -- 2.14.1 -- 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