[PATCH v2 0/9] Fix kpti-enabled kernels for Cavium ThunderX

[Ard Biesheuvel]

On 29 January 2018 at 11:59, Will Deacon <will.deacon at arm.com> wrote:
> Hi all,
>
> This is version two of the patches I posted on Friday:
>
>   http://lists.infradead.org/pipermail/linux-arm-kernel/2018-January/556304.html
>
> Changes since v1 include:
>
>   * Use SCTLR_ELx_M instead of open-coded #1
>   * Changed section attributes for .idmap.text to reflect actual mappings
>   * Rejigged phys_to_pte for consistency with pte_to_phys
>   * Added reviewer tags
>

Any chance we could base this on the arm64/kpti branch rather than
for-next/core? Any backports of kpti will need to include this series
as well, or we break ThunderX, and I'd rather have you merge it into
for-next/core rather than the various backporters (whose level of
familiarity with this code is invariably lower than yours) into the
stable trees.

For reference, my v4.14 backport of KPTI is here:

https://git.linaro.org/kernel/speculation-fixes-staging.git/log/?h=v4.14-kpti-only

containing just the KPTI pieces that were covered by the arm64 PR for v4.16

Once Marc's recent Spectre variant 2 stuff hits mainline as well, I
will pull that into a separate branch (which may just be based on this
one if they are too difficult to disentangle)



> --->8
>
> Marc Zyngier (1):
>   arm64: Force KPTI to be disabled on Cavium ThunderX
>
> Shanker Donthineni (1):
>   arm64: Add software workaround for Falkor erratum 1041
>
> Will Deacon (7):
>   arm64: kpti: Make use of nG dependent on
>     arm64_kernel_unmapped_at_el0()
>   arm64: mm: Permit transitioning from Global to Non-Global without BBM
>   arm64: kpti: Add ->enable callback to remap swapper using nG mappings
>   arm64: assembler: Change order of macro arguments in phys_to_ttbr
>   arm64: entry: Reword comment about post_ttbr_update_workaround
>   arm64: assembler: Align phys_to_pte with pte_to_phys
>   arm64: idmap: Use "awx" flags for .idmap.text .pushsection directives
>
>  Documentation/arm64/silicon-errata.txt  |   1 +
>  arch/arm64/Kconfig                      |  12 +-
>  arch/arm64/include/asm/assembler.h      |  36 +++++-
>  arch/arm64/include/asm/kernel-pgtable.h |  12 +-
>  arch/arm64/include/asm/pgtable-prot.h   |  30 +++--
>  arch/arm64/kernel/cpu-reset.S           |   3 +-
>  arch/arm64/kernel/cpufeature.c          |  42 ++++++-
>  arch/arm64/kernel/efi-entry.S           |   2 +
>  arch/arm64/kernel/entry.S               |  12 +-
>  arch/arm64/kernel/head.S                |  31 +----
>  arch/arm64/kernel/hibernate-asm.S       |   4 +-
>  arch/arm64/kernel/relocate_kernel.S     |   1 +
>  arch/arm64/kernel/sleep.S               |   2 +-
>  arch/arm64/kvm/hyp-init.S               |   3 +-
>  arch/arm64/mm/mmu.c                     |   4 +
>  arch/arm64/mm/proc.S                    | 212 ++++++++++++++++++++++++++++++--
>  16 files changed, 324 insertions(+), 83 deletions(-)
>
> --
> 2.1.4
>
>
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