linux-kernel - Re: [PATCH V2 0/8] arm64/mm: Drop PXD_TABLE

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Message-Id: <174180295545.4162360.4956385573664588446.b4-ty@arm.com>
Date: Wed, 12 Mar 2025 18:09:21 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: arm-kernel@...ts.infradead.org,
	Anshuman Khandual <anshuman.khandual@....com>
Cc: Will Deacon <will@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	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 0/8] arm64/mm: Drop PXD_TABLE_BIT

On Fri, 21 Feb 2025 10:12:19 +0530, Anshuman Khandual wrote:
> Remove the PXX_TABLE_BIT definitions and instead rely on PXX_TYPE_MASK,
> PXX_TYPE_SECT and PXX_TYPE_TABLE. The latter versions are more abstract
> and also include the PTE_VALID bit.
> 
> This abstraction is valuable for the impending D128 page table support,
> which doesn't have a single page table bit to determine table vs block.
> Instead it has the skip level (SKL) field, where it will consider 0 to
> mean table and any other value to mean a block entry. So PXX_TABLE_BIT
> therefore doesn't fit into the D128 model well, but the type fields do.
> 
> [...]

Applied to arm64 (for-next/drop-pxd_table_bit), thanks!

[1/8] KVM: arm64: ptdump: Test PMD_TYPE_MASK for block mapping
      https://git.kernel.org/arm64/c/0b626b245c57
[2/8] arm64/ptdump: Test PMD_TYPE_MASK for block mapping
      https://git.kernel.org/arm64/c/f5e93819e2cc
[3/8] arm64/mm: Clear PXX_TYPE_MASK in mk_[pmd|pud]_sect_prot()
      https://git.kernel.org/arm64/c/dba954801004
[4/8] arm64/mm: Clear PXX_TYPE_MASK and set PXD_TYPE_SECT in [pmd|pud]_mkhuge()
      https://git.kernel.org/arm64/c/1601df9e366e
[5/8] arm64/mm: Check PXD_TYPE_TABLE in [p4d|pgd]_bad()
      https://git.kernel.org/arm64/c/4fa8a9c0fc99
[6/8] arm64/mm: Check PUD_TYPE_TABLE in pud_bad()
      https://git.kernel.org/arm64/c/bfb1d2b9021c
[7/8] arm64/mm: Check pmd_table() in pmd_trans_huge()
      https://git.kernel.org/arm64/c/d1770e909898
[8/8] arm64/mm: Drop PXD_TABLE_BIT
      https://git.kernel.org/arm64/c/50c2726654bb

-- 
Catalin