linux-kernel - [RFC PATCH 17/18] x86/mm: add x86_64 support for pte

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Date:   Fri, 29 Apr 2022 21:35:51 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, tglx@...utronix.de,
        kirill.shutemov@...ux.intel.com, mika.penttila@...tfour.com,
        david@...hat.com, jgg@...dia.com, tj@...nel.org, dennis@...nel.org,
        ming.lei@...hat.com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, songmuchun@...edance.com,
        zhouchengming@...edance.com, Qi Zheng <zhengqi.arch@...edance.com>
Subject: [RFC PATCH 17/18] x86/mm: add x86_64 support for pte_ref

Add pte_ref hooks into routines that modify user PTE page tables,
and select ARCH_SUPPORTS_FREE_USER_PTE, so that the pte_ref code
can be compiled and worked on this architecture.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 arch/x86/Kconfig               | 1 +
 arch/x86/include/asm/pgtable.h | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b0142e01002e..c1046fc15882 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -34,6 +34,7 @@ config X86_64
 	select SWIOTLB
 	select ARCH_HAS_ELFCORE_COMPAT
 	select ZONE_DMA32
+	select ARCH_SUPPORTS_FREE_USER_PTE
 
 config FORCE_DYNAMIC_FTRACE
 	def_bool y
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 62ab07e24aef..08d0aa5ce8d4 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -23,6 +23,7 @@
 #include <asm/coco.h>
 #include <asm-generic/pgtable_uffd.h>
 #include <linux/page_table_check.h>
+#include <linux/pte_ref.h>
 
 extern pgd_t early_top_pgt[PTRS_PER_PGD];
 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
@@ -1010,6 +1011,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep, pte_t pte)
 {
 	page_table_check_pte_set(mm, addr, ptep, pte);
+	track_pte_set(mm, addr, ptep, pte);
 	set_pte(ptep, pte);
 }
 
@@ -1055,6 +1057,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 {
 	pte_t pte = native_ptep_get_and_clear(ptep);
 	page_table_check_pte_clear(mm, addr, pte);
+	track_pte_clear(mm, addr, ptep, pte);
 	return pte;
 }
 
@@ -1071,6 +1074,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 		 */
 		pte = native_local_ptep_get_and_clear(ptep);
 		page_table_check_pte_clear(mm, addr, pte);
+		track_pte_clear(mm, addr, ptep, pte);
 	} else {
 		pte = ptep_get_and_clear(mm, addr, ptep);
 	}
@@ -1081,7 +1085,8 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 static inline void ptep_clear(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep)
 {
-	if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK))
+	if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)
+	    || IS_ENABLED(CONFIG_FREE_USER_PTE))
 		ptep_get_and_clear(mm, addr, ptep);
 	else
 		pte_clear(mm, addr, ptep);
-- 
2.20.1