From mboxrd@z Thu Jan 1 00:00:00 1970 From: steve.capper@arm.com (Steve Capper) Date: Thu, 10 May 2018 17:23:39 +0100 Subject: [PATCH V3 0/8] 52-bit kernel VAs for arm64 Message-ID: <20180510162347.3858-1-steve.capper@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch series brings 52-bit kernel VA support to arm64; if supported at boot time. A new kernel option CONFIG_ARM64_VA_BITS_52 is available when configured with a 64KB PAGE_SIZE (as on ARMv8.2-LPA, 52-bit VAs are only allowed when running with a 64KB granule). Switching between 48 and 52-bit does not involve any changes to the number of page table levels. The number of PGDIR entries increases when running with a 52 bit kernel VA. In order to allow the kernel to switch between VA spaces at boot time, we need to re-arrange the current kernel VA space. In particular, the KASAN end address needs to be valid for both 48-bit and 52-bit VA spaces, meaning we need to flip the kernel VA space s.t. the KASAN end address is high and the direct linear mapping is low. This patch series applies to 4.17-rc4. Changes to V3: * VA_BITS now kepts constant (to mean maximum VA space size), * VA_BITS_MIN refers to minimum size of VA space, whilst VA_BITS_ACTUAL refers to runtime size. * Code to ensure plts veneers can address full 52-bit space added (code from Ard, I've put it into a patch). Changes to V2: * Kernel VA space only flipped, the order of modules, kImage etc are now retained, * 4.15-rc4 is used as a base as it includes a fix from V1 that has been merged already, * HASLR patch series is used as a base meaning HYP VA fixes are no longer required. Ard Bieusheuval (1): arm64: module-plts: Extend veneer to address 52-bit VAs Steve Capper (7): arm/arm64: KVM: Formalise end of direct linear map arm64: mm: Flip kernel VA space arm64: kasan: Switch to using KASAN_SHADOW_OFFSET arm64: mm: Replace fixed map BUILD_BUG_ON's with BUG_ON's arm64: dump: Make kernel page table dumper dynamic again arm64: mm: Make VA space size variable arm64: mm: Add 48/52-bit kernel VA support Documentation/arm64/kasan-offsets.sh | 20 ++++++++++++ arch/arm/include/asm/memory.h | 1 + arch/arm64/Kconfig | 22 +++++++++++++ arch/arm64/Makefile | 9 ------ arch/arm64/include/asm/efi.h | 4 +-- arch/arm64/include/asm/kasan.h | 11 +++---- arch/arm64/include/asm/memory.h | 30 ++++++++++++------ arch/arm64/include/asm/mmu_context.h | 2 +- arch/arm64/include/asm/module.h | 13 +++++++- arch/arm64/include/asm/pgtable-hwdef.h | 1 + arch/arm64/include/asm/pgtable.h | 4 +-- arch/arm64/include/asm/processor.h | 2 +- arch/arm64/kernel/head.S | 6 ++-- arch/arm64/kernel/kaslr.c | 6 ++-- arch/arm64/kernel/machine_kexec.c | 2 +- arch/arm64/kernel/module-plts.c | 12 +++++++ arch/arm64/kvm/va_layout.c | 14 ++++---- arch/arm64/mm/dump.c | 58 +++++++++++++++++++++++++++------- arch/arm64/mm/fault.c | 4 +-- arch/arm64/mm/init.c | 14 ++++---- arch/arm64/mm/kasan_init.c | 9 +++--- arch/arm64/mm/mmu.c | 17 ++++++---- arch/arm64/mm/proc.S | 41 ++++++++++++++++++++++++ virt/kvm/arm/mmu.c | 4 +-- 24 files changed, 225 insertions(+), 81 deletions(-) create mode 100644 Documentation/arm64/kasan-offsets.sh -- 2.11.0