[v3] arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability

[PATCH v3 0/2] arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability

Posted by Zeng Heng 6 days, 18 hours ago

From: Zeng Heng <zengheng4@huawei.com>

v2: https://lore.kernel.org/all/20260529063132.766491-1-zengheng@huaweicloud.com/
v1: https://lore.kernel.org/all/20260526015720.206854-1-zengheng@huaweicloud.com/

Changes in v3:
  - Keep CONFIG_ARM64_WORKAROUND_DISABLE_CNP config and generalise
    ARM64_WORKAROUND_DISABLE_CNP capability.

Changes in v2:
  - Unify CNP disable workaround into ARM64_WORKAROUND_DISABLE_CNP

Zeng Heng (2):
  arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability
  arm64: kernel: Disable CNP on HiSilicon HIP09

 Documentation/arch/arm64/silicon-errata.rst |  2 ++
 arch/arm64/Kconfig                          | 20 ++++++++++++++++++++
 arch/arm64/include/asm/cpucaps.h            |  4 ++--
 arch/arm64/kernel/cpu_errata.c              | 17 ++++++++++++-----
 arch/arm64/kernel/cpufeature.c              |  2 +-
 arch/arm64/tools/cpucaps                    |  2 +-
 6 files changed, 38 insertions(+), 9 deletions(-)

--
2.43.0

Re: [PATCH v3 0/2] arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability

Posted by Wei Xu 5 days, 17 hours ago

Hi Zeng Heng,

On 2026/6/1 19:19, Zeng Heng wrote:
> From: Zeng Heng <zengheng4@huawei.com>
> 
> v2: https://lore.kernel.org/all/20260529063132.766491-1-zengheng@huaweicloud.com/
> v1: https://lore.kernel.org/all/20260526015720.206854-1-zengheng@huaweicloud.com/
> 
> Changes in v3:
>   - Keep CONFIG_ARM64_WORKAROUND_DISABLE_CNP config and generalise
>     ARM64_WORKAROUND_DISABLE_CNP capability.
> 
> Changes in v2:
>   - Unify CNP disable workaround into ARM64_WORKAROUND_DISABLE_CNP
> 
> Zeng Heng (2):
>   arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability
>   arm64: kernel: Disable CNP on HiSilicon HIP09
> 
>  Documentation/arch/arm64/silicon-errata.rst |  2 ++
>  arch/arm64/Kconfig                          | 20 ++++++++++++++++++++
>  arch/arm64/include/asm/cpucaps.h            |  4 ++--
>  arch/arm64/kernel/cpu_errata.c              | 17 ++++++++++++-----
>  arch/arm64/kernel/cpufeature.c              |  2 +-
>  arch/arm64/tools/cpucaps                    |  2 +-
>  6 files changed, 38 insertions(+), 9 deletions(-)
> 
> --
> 2.43.0
> 
> .
> 

Thanks, all looks good to me and tested with the 7.1.0-rc1 kernel.

Acked-by: Wei Xu <xuwei5@hisilicon.com>
Tested-by: Wei Xu <xuwei5@hisilicon.com>

Best Regards,
Wei

Re: [PATCH v3 0/2] arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability

Posted by Vladimir Murzin 5 days, 20 hours ago

Hi,

On 6/1/26 12:19, Zeng Heng wrote:
> From: Zeng Heng <zengheng4@huawei.com>
> 
> v2: https://lore.kernel.org/all/20260529063132.766491-1-zengheng@huaweicloud.com/
> v1: https://lore.kernel.org/all/20260526015720.206854-1-zengheng@huaweicloud.com/
> 
> Changes in v3:
>   - Keep CONFIG_ARM64_WORKAROUND_DISABLE_CNP config and generalise
>     ARM64_WORKAROUND_DISABLE_CNP capability.
> 
> Changes in v2:
>   - Unify CNP disable workaround into ARM64_WORKAROUND_DISABLE_CNP
> 
> Zeng Heng (2):
>   arm64: cpufeature: Add WORKAROUND_DISABLE_CNP capability
>   arm64: kernel: Disable CNP on HiSilicon HIP09
> 
>  Documentation/arch/arm64/silicon-errata.rst |  2 ++
>  arch/arm64/Kconfig                          | 20 ++++++++++++++++++++
>  arch/arm64/include/asm/cpucaps.h            |  4 ++--
>  arch/arm64/kernel/cpu_errata.c              | 17 ++++++++++++-----
>  arch/arm64/kernel/cpufeature.c              |  2 +-
>  arch/arm64/tools/cpucaps                    |  2 +-
>  6 files changed, 38 insertions(+), 9 deletions(-)
> 
> --
> 2.43.0
> 

Thanks a lot for going the extra mile and putting everything
together! I have no further comments, but let's give others some
time to chime in.

Cheers
Vladimir