linux-kernel - Re: [PATCH v8 2/4] arm64: tlbflush: Introduce __flush_tlb_kernel

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Message-ID: <26d3696d-a298-fe1b-c686-0f12ea94d5a6@codeaurora.org>
Date:   Fri, 27 Apr 2018 18:00:22 +0530
From:   Chintan Pandya <cpandya@...eaurora.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     will.deacon@....com, mark.rutland@....com, toshi.kani@....com,
        linux-arch@...r.kernel.org, arnd@...db.de,
        ard.biesheuvel@...aro.org, marc.zyngier@....com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        kristina.martsenko@....com, takahiro.akashi@...aro.org,
        james.morse@....com, tglx@...utronix.de, akpm@...ux-foundation.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 2/4] arm64: tlbflush: Introduce
 __flush_tlb_kernel_pgtable



On 4/27/2018 3:59 PM, Catalin Marinas wrote:
> On Tue, Apr 03, 2018 at 01:30:44PM +0530, Chintan Pandya wrote:
>> Add an interface to invalidate intermediate page tables
>> from TLB for kernel.
>>
>> Signed-off-by: Chintan Pandya <cpandya@...eaurora.org>
>> ---
>>   arch/arm64/include/asm/tlbflush.h | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
>> index 9e82dd7..6a4816d 100644
>> --- a/arch/arm64/include/asm/tlbflush.h
>> +++ b/arch/arm64/include/asm/tlbflush.h
>> @@ -209,6 +209,12 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
>>   	dsb(ish);
>>   }
>>   
>> +static inline void __flush_tlb_kernel_pgtable(unsigned long addr)
>> +{
>> +	addr >>= 12;
>> +	__tlbi(vaae1is, addr);
>> +	dsb(ish);
>> +}
>>   #endif
> 
> Please use __TLBI_VADDR here as it does some additional masking.
> 
Sure.

Chintan
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