[PATCH V3 0/2] arm64: errata: Workaround Cortex-A715 errata #2645198

[Anshuman Khandual]

This series adds Cortex-A715 partnumber and workarounds the errata #2645198
which gets triggered when an userspace page mapping permission changes from
executable to non-executable, corrupting both ESR_EL1/FAR_EL1 registers
when an instruction abort is taken.

This series applies on v6.1-rc5.

The errata description can be found here.

https://developer.arm.com/documentation/SDEN2148827/1000/?lang=en

Cc: Catalin Marinas <catalin.marinas@xxxxxxx> 
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx> 
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx

Changes in V3:

- Replaced __set_pte_at() with set_pte_at() in ptep_modify_prot_commit()
- Dropped local variable 'pte_t pte', replaced with direct READ_ONCE(*ptep)
- Moved cpus_have_const_cap() earlier as per Catalin

Changes in V2:

https://lore.kernel.org/all/20221113012645.190301-1-anshuman.khandual@xxxxxxx/

- Added ptep_modify_prot_start/commit declaration into [asm/pgtable.h]
- Moved ptep_modify_prot_start/commit definitions into [arch/arm64/mm/mmu.c]
- Above code movements solved ptep_clear_flush() related build dependency
- Replaced __flush_tlb_range() with ptep_clear_flush()/huge_ptep_clear_flush()

Changes in V1:

https://lore.kernel.org/all/20221027023915.1318100-1-anshuman.khandual@xxxxxxx/


Anshuman Khandual (2):
  arm64: Add Cortex-715 CPU part definition
  arm64: errata: Workaround possible Cortex-A715 [ESR|FAR]_ELx corruption

 Documentation/arm64/silicon-errata.rst |  2 ++
 arch/arm64/Kconfig                     | 16 ++++++++++++++++
 arch/arm64/include/asm/cputype.h       |  2 ++
 arch/arm64/include/asm/hugetlb.h       |  9 +++++++++
 arch/arm64/include/asm/pgtable.h       |  9 +++++++++
 arch/arm64/kernel/cpu_errata.c         |  7 +++++++
 arch/arm64/mm/hugetlbpage.c            | 21 +++++++++++++++++++++
 arch/arm64/mm/mmu.c                    | 21 +++++++++++++++++++++
 arch/arm64/tools/cpucaps               |  1 +
 9 files changed, 88 insertions(+)

-- 
2.25.1