Re: [PATCH v1 03/13] arm64: mm: Implicitly invalidate user ASID based on TLBI operation

Ryan Roberts
2026-01-02T14:20:04Z

On 16/12/2025 18:01, Jonathan Cameron wrote:
> On Tue, 16 Dec 2025 14:45:48 +0000
> Ryan Roberts <ryan.roberts@arm.com> wrote:
>
>> When kpti is enabled, separate ASIDs are used for userspace and
>> kernelspace, requiring ASID-qualified TLB invalidation by virtual
>> address to invalidate both of them.
>>
>> Push the logic for invalidating the two ASIDs down into the low-level
>> tlbi-op-specific functions and remove the burden from the caller to
>> handle the kpti-specific behaviour.
>>
>> Co-developed-by: Will Deacon <will@kernel.org>
>> Signed-off-by: Will Deacon <will@kernel.org>
>> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
>> ---
>> arch/arm64/include/asm/tlbflush.h | 27 ++++++++++-----------------
>> 1 file changed, 10 insertions(+), 17 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
>> index c5111d2afc66..31f43d953ce2 100644
>> --- a/arch/arm64/include/asm/tlbflush.h
>> +++ b/arch/arm64/include/asm/tlbflush.h
>
>> +#undef __tlbi_user
>> #endif
>> -
> Hi Ryan,
>
> It's trivial Tuesday so... Unrelated white space change.

Thanks, will fix!

>
>> #endif
>