[PATCH v3 00/20] arm64: Unmap the kernel whilst running in userspace (KPTI)

Will Deacon
2017-12-06T12:40:42Z

Hi everybody,

This is version three of the patches formerly known as KAISER (♔).

v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-November/542751.html
v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-November/544817.html

Changes since v2 include:

* Rename command-line option from "kaiser=" to "kpti=" for parity with x86
* Fixed Falkor erratum workaround (missing '~')
* Moved vectors base from literal pool into separate data page
* Added TTBR_ASID_MASK instead of open-coded constants
* Added missing newline to error message
* Fail to probe SPE if KPTI is enabled
* Addressed minor review comments
* Added tags
* Based on -rc2

Patches are also pushed here:

git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git kpti

Feedback and testing welcome. At this point, I'd like to start thinking
about getting this merged for 4.16.

Cheers,

Will

--->8

Will Deacon (20):
arm64: mm: Use non-global mappings for kernel space
arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN
arm64: mm: Move ASID from TTBR0 to TTBR1
arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum
#E1003
arm64: mm: Rename post_ttbr0_update_workaround
arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN
arm64: mm: Allocate ASIDs in pairs
arm64: mm: Add arm64_kernel_unmapped_at_el0 helper
arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI
arm64: entry: Add exception trampoline page for exceptions from EL0
arm64: mm: Map entry trampoline into trampoline and kernel page tables
arm64: entry: Explicitly pass exception level to kernel_ventry macro
arm64: entry: Hook up entry trampoline to exception vectors
arm64: erratum: Work around Falkor erratum #E1003 in trampoline code
arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native
tasks
arm64: entry: Add fake CPU feature for unmapping the kernel at EL0
arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
perf: arm_spe: Fail device probe when arm64_kernel_unmapped_at_el0()
arm64: mm: Introduce TTBR_ASID_MASK for getting at the ASID in the
TTBR
arm64: kaslr: Put kernel vectors address in separate data page

arch/arm64/Kconfig | 30 +++--
arch/arm64/include/asm/asm-uaccess.h | 26 ++--
arch/arm64/include/asm/assembler.h | 27 +----
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/fixmap.h | 5 +
arch/arm64/include/asm/kernel-pgtable.h | 12 +-
arch/arm64/include/asm/mmu.h | 11 ++
arch/arm64/include/asm/mmu_context.h | 9 +-
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
arch/arm64/include/asm/pgtable-prot.h | 21 +++-
arch/arm64/include/asm/pgtable.h | 1 +
arch/arm64/include/asm/proc-fns.h | 6 -
arch/arm64/include/asm/tlbflush.h | 16 ++-
arch/arm64/include/asm/uaccess.h | 21 +++-
arch/arm64/kernel/asm-offsets.c | 6 +-
arch/arm64/kernel/cpufeature.c | 41 +++++++
arch/arm64/kernel/entry.S | 203 +++++++++++++++++++++++++++-----
arch/arm64/kernel/process.c | 12 +-
arch/arm64/kernel/vmlinux.lds.S | 40 ++++++-
arch/arm64/lib/clear_user.S | 2 +-
arch/arm64/lib/copy_from_user.S | 2 +-
arch/arm64/lib/copy_in_user.S | 2 +-
arch/arm64/lib/copy_to_user.S | 2 +-
arch/arm64/mm/cache.S | 2 +-
arch/arm64/mm/context.c | 36 +++---
arch/arm64/mm/mmu.c | 31 +++++
arch/arm64/mm/proc.S | 12 +-
arch/arm64/xen/hypercall.S | 2 +-
drivers/perf/arm_spe_pmu.c | 9 ++
29 files changed, 454 insertions(+), 137 deletions(-)

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2.1.4