arm64: kernel: Disable CNP on HiSilicon HIP09

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HiSilicon HIP09 implements TLB entry matching behavior that deviates
from the ARM architecture specification when the CNP (Common not Private)
bit is set in TTBRx_ELx.

When TTBRx.CNP=1, TLB entries may be incorrectly shared between CPU
cores, leading to TLB conflicts and stale mappings. This affects
coherency and can result in incorrect translations.

Add the hardware erratum workaround (Hisilicon erratum 162100125) to
disable CNP on affected HIP09 cores.

Co-developed-by: Tong Tiangen <tongtiangen@huawei.com>
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Will Deacon <will@kernel.org>

...

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Zeng Heng 2026-06-03 14:20:25 +08:00 • committed by Will Deacon

parent 25996982eb

commit f64328ecf4

3 changed files with 22 additions and 2 deletions

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2

Documentation/arch/arm64/silicon-errata.rst

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16

arch/arm64/Kconfig

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6

arch/arm64/kernel/cpu_errata.c

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