Here is v2 of 5-level paging patchset. Please consider applying first 7 patches. Main x86 portion requires more work (mostly Xen), but any feedback is welcome. I've also included a patch proposal to address compatibility issue with wide addresses that some software has. Ingo wants to to see opt-out, but I believe opt-in is required to not break userspace. That's not purely theoretical, I see one crash due to the issue. See description of patchset split below. == Overview == x86-64 is currently limited to 256 TiB of virtual address space and 64 TiB of physical address space. We are already bumping into this limit: some vendors offers servers with 64 TiB of memory today. To overcome the limitation upcoming hardware will introduce support for 5-level paging[1]. It is a straight-forward extension of the current page table structure adding one more layer of translation. It bumps the limits to 128 PiB of virtual address space and 4 PiB of physical address space. This "ought to be enough for anybody" ©. == Patches == The patchset is build on top of v4.10-rc1. Current QEMU upstream git supports 5-level paging. Use "-cpu qemu64,+la57" to enable it. Patch 1: Detect la57 feature for /proc/cpuinfo. It's trivial and can be applied now. Patches 2-7: Brings 5-level paging to generic code and convert all architectures to it using <asm-generic/5level-fixup.h> I think this should be ready for -mm tree. Please consider applying. Patches 8-15: Convert x86 to properly folded p4d layer using <asm-generic/pgtable-nop4d.h>. Patches 16-28: Enabling of real 5-level paging. CONFIG_X86_5LEVEL=y will enable new paging mode. Patch 29: Extends rlimit interface to set/get maximum virtual address that the application can map. This aims to address compatibility issue. Only supports x86 for now. I also patched dash to add the rlimit support. It was handy for testing. Let me know if anybody wants to play with it. Comments are welcome. Git: git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git la57/v2 == TODO == There is still work to do: - CONFIG_XEN is broken. Paravirt Xen MMU support hasn't yet adjusted to work with 5-level paging. It's legacy feature, not sure if we really need to support it with new paging, but it blocks Xen drivers too. I haven't got around to setup testing environment for XEN, so left it broken for now. I would appreciate help with the code. - Boot-time switch between 4- and 5-level paging. We assume that distributions will be keen to avoid returning to the i386 days where we shipped one kernel binary for each page table layout. As page table format is the same for 4- and 5-level paging it should be possible to have single kernel binary and switch between them at boot-time without too much hassle. For now I only implemented compile-time switch. This will implemented with separate patchset. == Changelong == v2: - Rebased to v4.10-rc1; - RLIMIT_VADDR proposal; - Fix virtual map and update documentation; - Fix few build errors; - Rework cpuid helpers in boot code; - Fix espfix code to work with 5-level pages; [1] https://software.intel.com/sites/default/files/managed/2b/80/5-level_paging_white_paper.pdf Kirill A. Shutemov (29): x86/cpufeature: Add 5-level paging detecton asm-generic: introduce 5level-fixup.h asm-generic: introduce __ARCH_USE_5LEVEL_HACK arch, mm: convert all architectures to use 5level-fixup.h asm-generic: introduce <asm-generic/pgtable-nop4d.h> mm: convert generic code to 5-level paging mm: introduce __p4d_alloc() x86: basic changes into headers for 5-level paging x86: trivial portion of 5-level paging conversion x86/gup: add 5-level paging support x86/ident_map: add 5-level paging support x86/mm: add support of p4d_t in vmalloc_fault() x86/power: support p4d_t in hibernate code x86/kexec: support p4d_t x86: convert the rest of the code to support p4d_t x86: detect 5-level paging support x86/asm: remove __VIRTUAL_MASK_SHIFT==47 assert x86/mm: define virtual memory map for 5-level paging x86/paravirt: make paravirt code support 5-level paging x86/mm: basic defines/helpers for CONFIG_X86_5LEVEL x86/dump_pagetables: support 5-level paging x86/mm: extend kasan to support 5-level paging x86/espfix: support 5-level paging x86/mm: add support of additional page table level during early boot x86/mm: add sync_global_pgds() for configuration with 5-level paging x86/mm: make kernel_physical_mapping_init() support 5-level paging x86/mm: add support for 5-level paging for KASLR x86: enable 5-level paging support mm, x86: introduce RLIMIT_VADDR Documentation/x86/x86_64/mm.txt | 33 ++- arch/arc/include/asm/hugepage.h | 1 + arch/arc/include/asm/pgtable.h | 1 + arch/arm/include/asm/pgtable.h | 1 + arch/arm64/include/asm/pgtable-types.h | 4 + arch/avr32/include/asm/pgtable-2level.h | 1 + arch/cris/include/asm/pgtable.h | 1 + arch/frv/include/asm/pgtable.h | 1 + arch/h8300/include/asm/pgtable.h | 1 + arch/hexagon/include/asm/pgtable.h | 1 + arch/ia64/include/asm/pgtable.h | 2 + arch/metag/include/asm/pgtable.h | 1 + arch/mips/include/asm/pgtable-32.h | 1 + arch/mips/include/asm/pgtable-64.h | 1 + arch/mn10300/include/asm/page.h | 1 + arch/nios2/include/asm/pgtable.h | 1 + arch/openrisc/include/asm/pgtable.h | 1 + arch/powerpc/include/asm/book3s/32/pgtable.h | 1 + arch/powerpc/include/asm/book3s/64/pgtable.h | 2 + arch/powerpc/include/asm/nohash/32/pgtable.h | 1 + arch/powerpc/include/asm/nohash/64/pgtable-4k.h | 3 + arch/powerpc/include/asm/nohash/64/pgtable-64k.h | 1 + arch/s390/include/asm/pgtable.h | 1 + arch/score/include/asm/pgtable.h | 1 + arch/sh/include/asm/pgtable-2level.h | 1 + arch/sh/include/asm/pgtable-3level.h | 1 + arch/sparc/include/asm/pgtable_64.h | 1 + arch/tile/include/asm/pgtable_32.h | 1 + arch/tile/include/asm/pgtable_64.h | 1 + arch/um/include/asm/pgtable-2level.h | 1 + arch/um/include/asm/pgtable-3level.h | 1 + arch/unicore32/include/asm/pgtable.h | 1 + arch/x86/Kconfig | 7 + arch/x86/boot/compressed/head_64.S | 23 ++- arch/x86/boot/cpucheck.c | 9 + arch/x86/boot/cpuflags.c | 12 +- arch/x86/entry/entry_64.S | 7 +- arch/x86/include/asm/cpufeatures.h | 3 +- arch/x86/include/asm/disabled-features.h | 8 +- arch/x86/include/asm/elf.h | 2 +- arch/x86/include/asm/kasan.h | 9 +- arch/x86/include/asm/kexec.h | 1 + arch/x86/include/asm/page_64_types.h | 10 + arch/x86/include/asm/paravirt.h | 64 +++++- arch/x86/include/asm/paravirt_types.h | 17 +- arch/x86/include/asm/pgalloc.h | 36 +++- arch/x86/include/asm/pgtable-2level_types.h | 1 + arch/x86/include/asm/pgtable-3level_types.h | 1 + arch/x86/include/asm/pgtable.h | 91 ++++++++- arch/x86/include/asm/pgtable_64.h | 29 ++- arch/x86/include/asm/pgtable_64_types.h | 27 +++ arch/x86/include/asm/pgtable_types.h | 42 +++- arch/x86/include/asm/processor.h | 17 +- arch/x86/include/asm/required-features.h | 8 +- arch/x86/include/asm/sparsemem.h | 9 +- arch/x86/include/uapi/asm/processor-flags.h | 2 + arch/x86/kernel/espfix_64.c | 12 +- arch/x86/kernel/head64.c | 40 +++- arch/x86/kernel/head_64.S | 58 ++++-- arch/x86/kernel/machine_kexec_32.c | 4 +- arch/x86/kernel/machine_kexec_64.c | 14 +- arch/x86/kernel/paravirt.c | 13 +- arch/x86/kernel/sys_x86_64.c | 6 +- arch/x86/kernel/tboot.c | 6 +- arch/x86/kernel/vm86_32.c | 6 +- arch/x86/mm/dump_pagetables.c | 51 ++++- arch/x86/mm/fault.c | 57 +++++- arch/x86/mm/gup.c | 33 ++- arch/x86/mm/hugetlbpage.c | 8 +- arch/x86/mm/ident_map.c | 42 +++- arch/x86/mm/init_32.c | 22 +- arch/x86/mm/init_64.c | 248 ++++++++++++++++++++--- arch/x86/mm/ioremap.c | 3 +- arch/x86/mm/kasan_init_64.c | 42 +++- arch/x86/mm/kaslr.c | 82 ++++++-- arch/x86/mm/mmap.c | 4 +- arch/x86/mm/pageattr.c | 56 +++-- arch/x86/mm/pgtable.c | 38 +++- arch/x86/mm/pgtable_32.c | 8 +- arch/x86/platform/efi/efi_64.c | 21 +- arch/x86/power/hibernate_32.c | 7 +- arch/x86/power/hibernate_64.c | 35 ++-- arch/x86/realmode/init.c | 2 +- arch/x86/xen/Kconfig | 1 + arch/xtensa/include/asm/pgtable.h | 1 + drivers/misc/sgi-gru/grufault.c | 9 +- fs/binfmt_aout.c | 2 - fs/binfmt_elf.c | 10 +- fs/hugetlbfs/inode.c | 6 +- fs/proc/base.c | 1 + fs/userfaultfd.c | 6 +- include/asm-generic/4level-fixup.h | 3 +- include/asm-generic/5level-fixup.h | 41 ++++ include/asm-generic/pgtable-nop4d-hack.h | 62 ++++++ include/asm-generic/pgtable-nop4d.h | 56 +++++ include/asm-generic/pgtable-nopud.h | 48 +++-- include/asm-generic/pgtable.h | 48 ++++- include/asm-generic/resource.h | 4 + include/asm-generic/tlb.h | 14 +- include/linux/hugetlb.h | 5 +- include/linux/kasan.h | 1 + include/linux/mm.h | 34 +++- include/linux/sched.h | 5 + include/uapi/asm-generic/resource.h | 3 +- kernel/events/uprobes.c | 5 +- kernel/sys.c | 6 +- lib/ioremap.c | 39 +++- mm/gup.c | 46 ++++- mm/huge_memory.c | 7 +- mm/hugetlb.c | 29 ++- mm/kasan/kasan_init.c | 35 +++- mm/memory.c | 230 +++++++++++++++++---- mm/mlock.c | 1 + mm/mmap.c | 20 +- mm/mprotect.c | 26 ++- mm/mremap.c | 16 +- mm/nommu.c | 2 +- mm/pagewalk.c | 32 ++- mm/pgtable-generic.c | 6 + mm/rmap.c | 13 +- mm/shmem.c | 8 +- mm/sparse-vmemmap.c | 22 +- mm/swapfile.c | 26 ++- mm/userfaultfd.c | 23 ++- mm/vmalloc.c | 81 ++++++-- 125 files changed, 2047 insertions(+), 410 deletions(-) create mode 100644 include/asm-generic/5level-fixup.h create mode 100644 include/asm-generic/pgtable-nop4d-hack.h create mode 100644 include/asm-generic/pgtable-nop4d.h -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html