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From: Catalin Marinas <catalin.marinas@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	akpm@linux-foundation.org, suzuki.poulose@arm.com,
	mark.rutland@arm.com, will@kernel.org, maz@kernel.org,
	james.morse@arm.com, steven.price@arm.com
Subject: Re: [RFC V2 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES
Date: Thu, 5 Aug 2021 18:23:15 +0100	[thread overview]
Message-ID: <20210805172314.GF6719@arm.com> (raw)
In-Reply-To: <1627281445-12445-11-git-send-email-anshuman.khandual@arm.com>

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@arm.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.

-- 
Catalin

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WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	akpm@linux-foundation.org, suzuki.poulose@arm.com,
	mark.rutland@arm.com, will@kernel.org, maz@kernel.org,
	james.morse@arm.com, steven.price@arm.com
Subject: Re: [RFC V2 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES
Date: Thu, 5 Aug 2021 18:23:15 +0100	[thread overview]
Message-ID: <20210805172314.GF6719@arm.com> (raw)
In-Reply-To: <1627281445-12445-11-git-send-email-anshuman.khandual@arm.com>

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@arm.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.

-- 
Catalin


  reply	other threads:[~2021-08-05 17:25 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26  6:37 [RFC V2 00/10] arm64/mm: Enable FEAT_LPA2 (52 bits PA support on 4K|16K pages) Anshuman Khandual
2021-07-26  6:37 ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 01/10] mm/mmap: Dynamically initialize protection_map[] Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:03   ` Catalin Marinas
2021-08-05 17:03     ` Catalin Marinas
2021-08-12  9:15     ` Anshuman Khandual
2021-08-12  9:15       ` Anshuman Khandual
2021-08-13  7:16       ` Anshuman Khandual
2021-08-13  7:16         ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 02/10] arm64/mm: Consolidate TCR_EL1 fields Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:05   ` Catalin Marinas
2021-08-05 17:05     ` Catalin Marinas
2021-07-26  6:37 ` [RFC V2 03/10] arm64/mm: Add FEAT_LPA2 specific TCR_EL1.DS field Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:06   ` Catalin Marinas
2021-08-05 17:06     ` Catalin Marinas
2021-07-26  6:37 ` [RFC V2 04/10] arm64/mm: Add FEAT_LPA2 specific ID_AA64MMFR0.TGRAN[2] Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:06   ` Catalin Marinas
2021-08-05 17:06     ` Catalin Marinas
2021-07-26  6:37 ` [RFC V2 05/10] arm64/mm: Add CONFIG_ARM64_PA_BITS_52_[LPA|LPA2] Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:25   ` Catalin Marinas
2021-08-05 17:25     ` Catalin Marinas
2021-08-12 10:09     ` Anshuman Khandual
2021-08-12 10:09       ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 06/10] arm64/mm: Add FEAT_LPA2 specific encoding Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 07/10] arm64/mm: Detect and enable FEAT_LPA2 Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 08/10] arm64/mm: Add FEAT_LPA2 specific PTE_SHARED and PMD_SECT_S Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 09/10] arm64/mm: Add FEAT_LPA2 specific fallback (48 bits PA) when not implemented Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-07-26  6:37 ` [RFC V2 10/10] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES Anshuman Khandual
2021-07-26  6:37   ` Anshuman Khandual
2021-08-05 17:23   ` Catalin Marinas [this message]
2021-08-05 17:23     ` Catalin Marinas
2021-08-12  9:13     ` Anshuman Khandual
2021-08-12  9:13       ` Anshuman Khandual

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