From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu, linux-hardening@vger.kernel.org,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>, Fuad Tabba <tabba@google.com>,
Quentin Perret <qperret@google.com>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: [RFC PATCH 01/12] asm-generic/pgalloc: allow arch to override PMD alloc/free routines
Date: Wed, 26 Jan 2022 18:30:00 +0100 [thread overview]
Message-ID: <20220126173011.3476262-2-ardb@kernel.org> (raw)
In-Reply-To: <20220126173011.3476262-1-ardb@kernel.org>
Extend the existing CPP macro based hooks that allow architectures to
specialize the code that allocates and frees pages to be used as page
tables.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
include/asm-generic/pgalloc.h | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
index 977bea16cf1b..65f31f615d99 100644
--- a/include/asm-generic/pgalloc.h
+++ b/include/asm-generic/pgalloc.h
@@ -34,6 +34,7 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
}
#endif
+#ifndef __HAVE_ARCH_PTE_FREE_KERNEL
/**
* pte_free_kernel - free PTE-level kernel page table page
* @mm: the mm_struct of the current context
@@ -43,6 +44,7 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
}
+#endif
/**
* __pte_alloc_one - allocate a page for PTE-level user page table
@@ -91,6 +93,7 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
* done with a reference count in struct page.
*/
+#ifndef __HAVE_ARCH_PTE_FREE
/**
* pte_free - free PTE-level user page table page
* @mm: the mm_struct of the current context
@@ -101,11 +104,11 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
pgtable_pte_page_dtor(pte_page);
__free_page(pte_page);
}
+#endif
#if CONFIG_PGTABLE_LEVELS > 2
-#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
/**
* pmd_alloc_one - allocate a page for PMD-level page table
* @mm: the mm_struct of the current context
@@ -116,7 +119,7 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
*
* Return: pointer to the allocated memory or %NULL on error
*/
-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+static inline pmd_t *__pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
struct page *page;
gfp_t gfp = GFP_PGTABLE_USER;
@@ -132,6 +135,12 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
}
return (pmd_t *)page_address(page);
}
+
+#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+ return __pmd_alloc_one(mm, addr);
+}
#endif
#ifndef __HAVE_ARCH_PMD_FREE
--
2.30.2
next prev parent reply other threads:[~2022-01-26 17:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-26 17:29 [RFC PATCH 00/12] arm64: implement read-only page tables Ard Biesheuvel
2022-01-26 17:30 ` Ard Biesheuvel [this message]
2022-01-26 17:30 ` [RFC PATCH 02/12] arm64: mm: add helpers to remap page tables read-only/read-write Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 03/12] arm64: mm: use a fixmap slot for user page table modifications Ard Biesheuvel
2022-01-28 16:08 ` Steven Price
2022-01-26 17:30 ` [RFC PATCH 04/12] arm64: mm: remap PGD pages r/o in the linear region after allocation Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 05/12] arm64: mm: remap PUD pages r/o in linear region Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 06/12] arm64: mm: remap PMD " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 07/12] arm64: mm: remap PTE level user page tables r/o in the " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 08/12] arm64: mm: remap kernel PTE level " Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 09/12] arm64: mm: remap kernel page tables read-only at end of init Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 10/12] mm: add default definition of p4d_index() Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 11/12] arm64: efi: use set_pte_at() not set_pte() in order to pass mm pointer Ard Biesheuvel
2022-01-26 17:30 ` [RFC PATCH 12/12] arm64: hugetlb: use set_pte_at() not set_pte() to provide " Ard Biesheuvel
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