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

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Message-Id: <20250221044227.1145393-1-anshuman.khandual@arm.com>
Date: Fri, 21 Feb 2025 10:12:19 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: arm-kernel@...ts.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Catalin Marinas <catalin.marinas@....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: [PATCH V2 0/8] arm64/mm: Drop PXD_TABLE_BIT

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.

This series applies on v6.14-rc3.

Changes in V2:

- Changed pmd_mkhuge() and pud_mkhuge() implementation
- Changed pud_bad() implementation with an additional patch

Changes in V1:

https://lore.kernel.org/all/20241005123824.1366397-1-anshuman.khandual@arm.com/

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: Ard Biesheuvel <ardb@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: kvmarm@...ts.linux.dev
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org

Anshuman Khandual (6):
  KVM: arm64: ptdump: Test PMD_TYPE_MASK for block mapping
  arm64/ptdump: Test PMD_TYPE_MASK for block mapping
  arm64/mm: Clear PXX_TYPE_MASK in mk_[pmd|pud]_sect_prot()
  arm64/mm: Clear PXX_TYPE_MASK and set PXD_TYPE_SECT in [pmd|pud]_mkhuge()
  arm64/mm: Check PXD_TYPE_TABLE in [p4d|pgd]_bad()
  arm64/mm: Drop PXD_TABLE_BIT

Ryan Roberts (2):
  arm64/mm: Check PUD_TYPE_TABLE in pud_bad()
  arm64/mm: Check pmd_table() in pmd_trans_huge()

 arch/arm64/include/asm/pgtable-hwdef.h |  5 --
 arch/arm64/include/asm/pgtable.h       | 65 ++++++++++++++++++--------
 arch/arm64/kvm/ptdump.c                |  4 +-
 arch/arm64/mm/ptdump.c                 |  4 +-
 4 files changed, 50 insertions(+), 28 deletions(-)

-- 
2.25.1