[RFC PATCH 2/2] arm64, tlbflush: don't TLBI broadcast if page reused in write fault

[Huang, Ying]

Catalin Marinas <catalin.marinas at arm.com> writes:

> On Thu, Sep 18, 2025 at 10:18:49AM +0800, Huang, Ying wrote:
>> Ryan Roberts <ryan.roberts at arm.com> writes:
>> > contpte_ptep_set_access_flags() currently does a (broadcast) __flush_tlb_range()
>> > on the (pte_write(orig_pte) == pte_write(entry)) path. I think that should be
>> > changed to a local range invalidation to be consistent with this change.
>> 
>> Yes.  This should be changed too.  However, it means we need a local
>> variant of __flush_tlb_range() and flush_tlb_mm().  Is it OK to
>> introduce them first and tidy up later?
>
> If it's just for contpte, we'd never take the flush_tlb_mm() path. So we
> could instead add a specific local_flush_tlb_contpte_range().

Sure.

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Best Regards,
Huang, Ying