From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi1-f199.google.com (mail-oi1-f199.google.com [209.85.167.199]) by kanga.kvack.org (Postfix) with ESMTP id 119C86B0010 for ; Wed, 17 Oct 2018 12:35:21 -0400 (EDT) Received: by mail-oi1-f199.google.com with SMTP id m206-v6so18554121oig.0 for ; Wed, 17 Oct 2018 09:35:21 -0700 (PDT) Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id w3-v6si8166561oib.18.2018.10.17.09.35.19 for ; Wed, 17 Oct 2018 09:35:19 -0700 (PDT) From: Steve Capper Subject: [PATCH V2 0/4] 52-bit userspace VAs Date: Wed, 17 Oct 2018 17:34:55 +0100 Message-Id: <20181017163459.20175-1-steve.capper@arm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will.deacon@arm.com, ard.biesheuvel@linaro.org, jcm@redhat.com, Steve Capper This patch series brings support for 52-bit userspace VAs to systems that have ARMv8.2-LVA and are running with a 48-bit VA_BITS and a 64KB PAGE_SIZE. If no hardware support is present, the kernel runs with a 48-bit VA space for userspace. Userspace can exploit this feature by providing an address hint to mmap where addr[51:48] != 0. Otherwise all the VA mappings will behave in the same way as a 48-bit VA system (this is to maintain compatibility with software that assumes the maximum VA size on arm64 is 48-bit). This patch series applies to 4.19-rc7. Testing was in a model with Trusted Firmware and UEFI for boot. The major change to V2 of the series is that mm/mmap.c is altered in the first patch of the series (rather than copied over to arch/arm64). Steve Capper (4): mm: mmap: Allow for "high" userspace addresses arm64: mm: Introduce DEFAULT_MAP_WINDOW arm64: mm: Define arch_get_mmap_end, arch_get_mmap_base arm64: mm: introduce 52-bit userspace support arch/arm64/Kconfig | 4 ++++ arch/arm64/include/asm/assembler.h | 7 +++---- arch/arm64/include/asm/elf.h | 2 +- arch/arm64/include/asm/mmu_context.h | 3 +++ arch/arm64/include/asm/pgalloc.h | 4 ++++ arch/arm64/include/asm/pgtable.h | 16 +++++++++++++--- arch/arm64/include/asm/processor.h | 29 ++++++++++++++++++++++------- arch/arm64/kernel/head.S | 13 +++++++++++++ arch/arm64/mm/fault.c | 2 +- arch/arm64/mm/mmu.c | 1 + arch/arm64/mm/proc.S | 10 +++++++++- drivers/firmware/efi/arm-runtime.c | 2 +- drivers/firmware/efi/libstub/arm-stub.c | 2 +- mm/mmap.c | 25 ++++++++++++++++++------- 14 files changed, 94 insertions(+), 26 deletions(-) -- 2.11.0