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

Laura Abbott
2017-12-08T00:40:09Z

On 12/06/2017 04:35 AM, Will Deacon wrote:
> 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.
>

You can add

Tested-by: Laura Abbott <labbott@redhat.com>

> 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(-)
>