linux-kernel - Re: [RFC V2 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]

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Message-ID: <a3eb7cc3-8f31-c70b-1830-830e10605d50@arm.com>
Date:   Thu, 12 Aug 2021 14:43:32 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        suzuki.poulose@....com, mark.rutland@....com, will@...nel.org,
        maz@...nel.org, james.morse@....com, steven.price@....com
Subject: Re: [RFC V2 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on
 CONFIG_ARM64_[4K|16K]_PAGES



On 8/5/21 10:53 PM, Catalin Marinas wrote:
> On Mon, Jul 26, 2021 at 12:07:25PM +0530, Anshuman Khandual wrote:
>> All required FEAT_LPA2 components for 52 bit PA range are already in place.
>> Just enable CONFIG_ARM64_PA_BITS_52 on 4K and 16K pages which would select
>> CONFIG_ARM64_PA_BITS_52_LPA2 activating 52 bit PA range via FEAT_LPA2.
>>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>>  arch/arm64/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 1999ac6..ce139415 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -952,9 +952,9 @@ config ARM64_PA_BITS_48
>>  
>>  config ARM64_PA_BITS_52
>>  	bool "52-bit (ARMv8.2)"
>> -	depends on ARM64_64K_PAGES
>>  	depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN
>>  	select ARM64_PA_BITS_52_LPA if ARM64_64K_PAGES
>> +	select ARM64_PA_BITS_52_LPA2 if (ARM64_4K_PAGES  || ARM64_16K_PAGES)
>>  	help
>>  	  Enable support for a 52-bit physical address space, introduced as
>>  	  part of the ARMv8.2-LPA extension.
> 
> If you do it this way, the text here needs updating and the 8.2
> architecture version removed.

Sure, will update as required.