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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com,
	maz@kernel.org, james.morse@arm.com, steven.price@arm.com
Subject: Re: [RFC V3 07/13] arm64/mm: Add FEAT_LPA2 specific encoding
Date: Tue, 12 Oct 2021 11:41:47 +0100	[thread overview]
Message-ID: <e78741a0-8a45-5460-3a95-5eb42c63d055@arm.com> (raw)
In-Reply-To: <1632998116-11552-8-git-send-email-anshuman.khandual@arm.com>

On 30/09/2021 11:35, Anshuman Khandual wrote:
> FEAT_LPA2 requires different PTE representation formats for both 4K and 16K
> page size config. This adds FEAT_LPA2 specific new PTE encodings as per ARM
> ARM (0487G.A) which updates [pte|phys]_to_[phys|pte](). The updated helpers
> would be used when FEAT_LPA2 gets enabled via CONFIG_ARM64_PA_BITS_52 on 4K
> and 16K page size. Although TTBR encoding and phys_to_ttbr() helper remains
> the same as FEAT_LPA for FEAT_LPA2 as well. It updates 'phys_to_pte' helper
> to accept a temporary variable and changes impacted call sites.
> 
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
>   arch/arm64/include/asm/assembler.h     | 14 +++++++++++---
>   arch/arm64/include/asm/pgtable-hwdef.h |  4 ++++
>   arch/arm64/include/asm/pgtable.h       |  4 ++++
>   3 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
> index 3fbe04a..c1543067 100644
> --- a/arch/arm64/include/asm/assembler.h
> +++ b/arch/arm64/include/asm/assembler.h
> @@ -628,6 +628,10 @@ alternative_endif
>   	 */
>   	orr	\pte, \phys, \phys, lsr #36
>   	and	\pte, \pte, #PTE_ADDR_MASK
> +#elif defined(CONFIG_ARM64_PA_BITS_52_LPA2)
> +	orr	\pte, \phys, \phys, lsr #42
> +	and	\pte, \pte, #PTE_ADDR_MASK | GENMASK(PAGE_SHIFT - 1, 10)
> +	and	\pte, \pte, #~GENMASK(PAGE_SHIFT - 1, 10)
>   #else  /* !CONFIG_ARM64_PA_BITS_52_LPA */
>   	mov	\pte, \phys
>   #endif /* CONFIG_ARM64_PA_BITS_52_LPA */
> @@ -635,9 +639,13 @@ alternative_endif
>   
>   	.macro	pte_to_phys, phys, pte
>   #ifdef CONFIG_ARM64_PA_BITS_52_LPA
> -	ubfiz	\phys, \pte, #(48 - 16 - 12), #16
> -	bfxil	\phys, \pte, #16, #32
> -	lsl	\phys, \phys, #16
> +	ubfiz	\phys, \pte, #(48 - PAGE_SHIFT - 12), #16
> +	bfxil	\phys, \pte, #PAGE_SHIFT, #(48 - PAGE_SHIFT)

nit: This looks like an unrelated change and is better suited for the 
previous patch.


Suzuki

  reply	other threads:[~2021-10-12 10:41 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-30 10:35 [RFC V3 00/13] arm64/mm: Enable FEAT_LPA2 (52 bits PA support on 4K|16K pages) Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 01/13] arm64/mm: Dynamically initialize protection_map[] Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 02/13] arm64/mm: Consolidate TCR_EL1 fields Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 03/13] arm64/mm: Add FEAT_LPA2 specific TCR_EL1.DS field Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 04/13] arm64/mm: Add FEAT_LPA2 specific VTCR_EL2.DS field Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 05/13] arm64/mm: Add FEAT_LPA2 specific ID_AA64MMFR0.TGRAN[2] Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 06/13] arm64/mm: Add CONFIG_ARM64_PA_BITS_52_[LPA|LPA2] Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 07/13] arm64/mm: Add FEAT_LPA2 specific encoding Anshuman Khandual
2021-10-12 10:41   ` Suzuki K Poulose [this message]
2021-10-13  2:55     ` Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 08/13] arm64/mm: Detect and enable FEAT_LPA2 Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 09/13] arm64/mm: Add __cpu_secondary_check52bitpa() Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 10/13] arm64/mm: Add FEAT_LPA2 specific PTE_SHARED and PMD_SECT_S Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 11/13] arm64/mm: Add FEAT_LPA2 specific fallback (48 bits PA) when not implemented Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 12/13] arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES Anshuman Khandual
2021-09-30 10:35 ` [RFC V3 13/13] KVM: arm64: Enable FEAT_LPA2 based 52 bits IPA size on 4K and 16K Anshuman Khandual
2021-10-11 10:16   ` Marc Zyngier
2021-10-12  4:24     ` Anshuman Khandual
2021-10-12  8:30       ` Marc Zyngier
2021-10-13  3:28         ` Anshuman Khandual

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