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Subject[PATCH v2 00/18] arm64: Unmap the kernel whilst running in userspace (KAISER)
Date
Hi again,

This is version two of the patches previously posted here:

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

Changes since v1 include:

* Based on v4.15-rc1
* Trampoline moved into FIXMAP area
* Explicit static key replaced by cpu cap
* Disable SPE for userspace profiling if kernel unmapped at EL0
* Changed polarity of cpu feature to match config option
* Changed command-line option so we can force on in future if necessary
* Changed Falkor workaround to invalidate different page within 2MB region
* Reworked alternative sequences in entry.S, since the NOP slides with
kaiser=off were measurable

I experimented with leaving the vbar set to point at the kaiser vectors,
but I couldn't measure any performance improvement from that and it made
the code slightly more complicated, so I've left it as-is.

Patches based on 4.15-rc1 and also pushed here:

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

Feedback welcome, particularly on a better name for the command-line option.

Will

--->8

Will Deacon (18):
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: Disallow userspace profiling when
arm_kernel_unmapped_at_el0()

arch/arm64/Kconfig | 30 +++--
arch/arm64/include/asm/asm-uaccess.h | 25 +++--
arch/arm64/include/asm/assembler.h | 27 +----
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/fixmap.h | 4 +
arch/arm64/include/asm/kernel-pgtable.h | 12 +-
arch/arm64/include/asm/mmu.h | 10 ++
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 | 190 +++++++++++++++++++++++++++-----
arch/arm64/kernel/process.c | 12 +-
arch/arm64/kernel/vmlinux.lds.S | 17 +++
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 | 23 ++++
arch/arm64/mm/proc.S | 12 +-
arch/arm64/xen/hypercall.S | 2 +-
drivers/perf/arm_spe_pmu.c | 7 ++
29 files changed, 407 insertions(+), 135 deletions(-)

--
2.1.4

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