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2bd507795e
The uffd-wp PTE bit is about to gain a second consumer: userfaultfd RWP
will use the same bit to mark access-tracking PTEs, distinct from
mprotect(PROT_NONE) or NUMA-hinting PTEs. WP vs RWP semantics come from
the VMA flag; the bit is just "uffd has claimed this entry." Drop the
"_wp" suffix from the arch-private bit macros so they reflect that.
x86: _PAGE_BIT_UFFD_WP -> _PAGE_BIT_UFFD
_PAGE_UFFD_WP -> _PAGE_UFFD
_PAGE_SWP_UFFD_WP -> _PAGE_SWP_UFFD
arm64: PTE_UFFD_WP -> PTE_UFFD
PTE_SWP_UFFD_WP -> PTE_SWP_UFFD
riscv: _PAGE_UFFD_WP -> _PAGE_UFFD
_PAGE_SWP_UFFD_WP -> _PAGE_SWP_UFFD
Pure mechanical rename -- no behavior change.
Link: https://lore.kernel.org/20260708111417.173443-3-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Assisted-by: Claude:claude-opus-4-6
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: James Houghton <jthoughton@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PGTABLE_BITS_H
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#define _ASM_RISCV_PGTABLE_BITS_H
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#define _PAGE_ACCESSED_OFFSET 6
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#define _PAGE_PRESENT (1 << 0)
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#define _PAGE_READ (1 << 1) /* Readable */
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#define _PAGE_WRITE (1 << 2) /* Writable */
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#define _PAGE_EXEC (1 << 3) /* Executable */
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#define _PAGE_USER (1 << 4) /* User */
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#define _PAGE_GLOBAL (1 << 5) /* Global */
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#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
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#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
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#define _PAGE_SOFT (3 << 8) /* Reserved for software */
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#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
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#ifdef CONFIG_MEM_SOFT_DIRTY
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/* ext_svrsw60t59b: bit 59 for soft-dirty tracking */
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#define _PAGE_SOFT_DIRTY \
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((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
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(1UL << 59) : 0)
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/*
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* Bit 3 is always zero for swap entry computation, so we
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* can borrow it for swap page soft-dirty tracking.
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*/
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#define _PAGE_SWP_SOFT_DIRTY \
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((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
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_PAGE_EXEC : 0)
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#else
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#define _PAGE_SOFT_DIRTY 0
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#define _PAGE_SWP_SOFT_DIRTY 0
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#endif /* CONFIG_MEM_SOFT_DIRTY */
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#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
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/* ext_svrsw60t59b: Bit(60) for userfaultfd tracking */
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#define _PAGE_UFFD \
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((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
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(1UL << 60) : 0)
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/*
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* Bit 4 is not involved into swap entry computation, so we
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* can borrow it for swap page userfaultfd tracking.
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*/
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#define _PAGE_SWP_UFFD \
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((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
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_PAGE_USER : 0)
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#else
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#define _PAGE_UFFD 0
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#define _PAGE_SWP_UFFD 0
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#endif
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#define _PAGE_TABLE _PAGE_PRESENT
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/*
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* _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
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* distinguish them from swapped out pages
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*/
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#define _PAGE_PROT_NONE _PAGE_GLOBAL
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/* Used for swap PTEs only. */
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#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
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#define _PAGE_PFN_SHIFT 10
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/*
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* when all of R/W/X are zero, the PTE is a pointer to the next level
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* of the page table; otherwise, it is a leaf PTE.
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*/
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#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
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#endif /* _ASM_RISCV_PGTABLE_BITS_H */
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