linux-kernel - [PATCH -next v4 1/4] mm: page_table_check: move pxx_user_accessible

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Message-ID: <20220418034444.520928-2-tongtiangen@huawei.com>
Date:   Mon, 18 Apr 2022 03:44:41 +0000
From:   Tong Tiangen <tongtiangen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>,
        Tong Tiangen <tongtiangen@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Guohanjun <guohanjun@...wei.com>
Subject: [PATCH -next v4 1/4] mm: page_table_check: move pxx_user_accessible_page into x86

From: Kefeng Wang <wangkefeng.wang@...wei.com>

The pxx_user_accessible_page() check the PTE bit, it's
architecture-specific code, move them into x86's pgtable.h,
also add default PMD/PUD_PAGE_SIZE definition, it's prepare
for support page table check feature on new architecture.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Acked-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 arch/x86/include/asm/pgtable.h | 19 +++++++++++++++++++
 mm/page_table_check.c          | 25 ++++++++-----------------
 2 files changed, 27 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index b7464f13e416..564abe42b0f7 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1447,6 +1447,25 @@ static inline bool arch_has_hw_pte_young(void)
 	return true;
 }
 
+#ifdef CONFIG_PAGE_TABLE_CHECK
+static inline bool pte_user_accessible_page(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
+}
+
+static inline bool pmd_user_accessible_page(pmd_t pmd)
+{
+	return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) &&
+		(pmd_val(pmd) & _PAGE_USER);
+}
+
+static inline bool pud_user_accessible_page(pud_t pud)
+{
+	return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) &&
+		(pud_val(pud) & _PAGE_USER);
+}
+#endif
+
 #endif	/* __ASSEMBLY__ */
 
 #endif /* _ASM_X86_PGTABLE_H */
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 2458281bff89..145f059d1c4d 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -10,6 +10,14 @@
 #undef pr_fmt
 #define pr_fmt(fmt)	"page_table_check: " fmt
 
+#ifndef PMD_PAGE_SIZE
+#define PMD_PAGE_SIZE	PMD_SIZE
+#endif
+
+#ifndef PUD_PAGE_SIZE
+#define PUD_PAGE_SIZE	PUD_SIZE
+#endif
+
 struct page_table_check {
 	atomic_t anon_map_count;
 	atomic_t file_map_count;
@@ -52,23 +60,6 @@ static struct page_table_check *get_page_table_check(struct page_ext *page_ext)
 	return (void *)(page_ext) + page_table_check_ops.offset;
 }
 
-static inline bool pte_user_accessible_page(pte_t pte)
-{
-	return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
-}
-
-static inline bool pmd_user_accessible_page(pmd_t pmd)
-{
-	return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) &&
-		(pmd_val(pmd) & _PAGE_USER);
-}
-
-static inline bool pud_user_accessible_page(pud_t pud)
-{
-	return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) &&
-		(pud_val(pud) & _PAGE_USER);
-}
-
 /*
  * An enty is removed from the page table, decrement the counters for that page
  * verify that it is of correct type and counters do not become negative.
-- 
2.25.1