linux-kernel - Re: [PATCH] mm: add PTE pointer parameter to flush_tlb_fix_spurious

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Message-ID: <87mt4p1nly.fsf@mpe.ellerman.id.au>
Date:   Tue, 07 Mar 2023 10:11:53 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-mips <linux-mips@...r.kernel.org>,
        linux-power <linuxppc-dev@...ts.ozlabs.org>,
        linux-x86 <x86@...nel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: add PTE pointer parameter to
 flush_tlb_fix_spurious_fault()

Gerald Schaefer <gerald.schaefer@...ux.ibm.com> writes:
> s390 can do more fine-grained handling of spurious TLB protection faults,
> when there also is the PTE pointer available.
>
> Therefore, pass on the PTE pointer to flush_tlb_fix_spurious_fault() as
> an additional parameter.
>
> This will add no functional change to other architectures, but those with
> private flush_tlb_fix_spurious_fault() implementations need to be made
> aware of the new parameter.
>
> Reviewed-by: Alexander Gordeev <agordeev@...ux.ibm.com>
> Signed-off-by: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
> ---
>  arch/arm64/include/asm/pgtable.h              |  2 +-
>  arch/mips/include/asm/pgtable.h               |  3 ++-
>  arch/powerpc/include/asm/book3s/64/tlbflush.h |  3 ++-
>  arch/s390/include/asm/pgtable.h               | 12 +++++++-----
>  arch/x86/include/asm/pgtable.h                |  2 +-
>  include/linux/pgtable.h                       |  2 +-
>  mm/memory.c                                   |  3 ++-
>  mm/pgtable-generic.c                          |  2 +-
>  8 files changed, 17 insertions(+), 12 deletions(-)
...
> diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h
> index 2bbc0fcce04a..ff7f0ee179e5 100644
> --- a/arch/powerpc/include/asm/book3s/64/tlbflush.h
> +++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h
> @@ -121,7 +121,8 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
>  
>  #define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault
>  static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
> -						unsigned long address)
> +						unsigned long address,
> +						pte_t *ptep)
>  {
>  	/*
>  	 * Book3S 64 does not require spurious fault flushes because the PTE

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers