linux-kernel - Re: [PATCH V2 1/8] KVM: arm64: ptdump: Test PMD_TYPE

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Message-ID: <Z9B8lyYEtL62ZzVb@arm.com>
Date: Tue, 11 Mar 2025 18:10:31 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
	Anshuman Khandual <anshuman.khandual@....com>
Cc: arm-kernel@...ts.infradead.org, James Morse <james.morse@....com>,
	Will Deacon <will@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/8] KVM: arm64: ptdump: Test PMD_TYPE_MASK for block
 mapping

On Fri, Feb 21, 2025 at 10:12:20AM +0530, Anshuman Khandual wrote:
> Test given page table entries against PMD_TYPE_SECT on PMD_TYPE_MASK mask
> bits for identifying block mappings in stage 2 page tables.
> 
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Oliver Upton <oliver.upton@...ux.dev>
> Cc: James Morse <james.morse@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: kvmarm@...ts.linux.dev
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>  arch/arm64/kvm/ptdump.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/ptdump.c b/arch/arm64/kvm/ptdump.c
> index e4a342e903e2..098416d7e5c2 100644
> --- a/arch/arm64/kvm/ptdump.c
> +++ b/arch/arm64/kvm/ptdump.c
> @@ -52,8 +52,8 @@ static const struct ptdump_prot_bits stage2_pte_bits[] = {
>  		.set	= "AF",
>  		.clear	= "  ",
>  	}, {
> -		.mask	= PTE_TABLE_BIT | PTE_VALID,
> -		.val	= PTE_VALID,
> +		.mask	= PMD_TYPE_MASK,
> +		.val	= PMD_TYPE_SECT,
>  		.set	= "BLK",
>  		.clear	= "   ",
>  	},

Marc, Oliver - are you ok with this patch going in through the arm64
tree?

Thanks.

-- 
Catalin