linux-kernel - [PATCH v3 26/34] x86: Implement the new page table range API

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Date:   Tue, 28 Feb 2023 21:37:29 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org, linux-arch@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, 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>
Subject: [PATCH v3 26/34] x86: Implement the new page table range API

Convert set_pte_at() into set_ptes() and add a noop
update_mmu_cache_range().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/include/asm/pgtable.h | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 84be3e07b112..f424371ea143 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1019,13 +1019,22 @@ static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
 	return res;
 }
 
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
-			      pte_t *ptep, pte_t pte)
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+			      pte_t *ptep, pte_t pte, unsigned int nr)
 {
-	page_table_check_ptes_set(mm, addr, ptep, pte, 1);
-	set_pte(ptep, pte);
+	page_table_check_ptes_set(mm, addr, ptep, pte, nr);
+
+	for (;;) {
+		set_pte(ptep, pte);
+		if (--nr == 0)
+			break;
+		ptep++;
+		pte = __pte(pte_val(pte) + PAGE_SIZE);
+	}
 }
 
+#define set_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)
+
 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 			      pmd_t *pmdp, pmd_t pmd)
 {
@@ -1291,6 +1300,10 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
 		unsigned long addr, pte_t *ptep)
 {
 }
+static inline void update_mmu_cache_range(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep, unsigned int nr)
+{
+}
 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmd)
 {
-- 
2.39.1