Some architectures are able to set the accessed bit in PTEs when PTEs
are used as part of linear address translations.
Add CONFIG_ARCH_HAS_HW_PTE_YOUNG for such architectures to be able to
override arch_has_hw_pte_young().
Signed-off-by: Kinsey Ho <kinseyho@xxxxxxxxxx>
Co-developed-by: Aneesh Kumar K V <aneesh.kumar@xxxxxxxxxxxxx>
Signed-off-by: Aneesh Kumar K V <aneesh.kumar@xxxxxxxxxxxxx>
---
arch/Kconfig | 8 ++++++++
arch/arm64/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/include/asm/pgtable.h | 6 ------
include/linux/pgtable.h | 2 +-
5 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index f4b210ab0612..8c8901f80586 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1470,6 +1470,14 @@ config DYNAMIC_SIGFRAME
config HAVE_ARCH_NODE_DEV_GROUP
bool
+config ARCH_HAS_HW_PTE_YOUNG
+ bool
+ help
+ Architectures that select this option are capable of setting the
+ accessed bit in PTE entries when using them as part of linear address
+ translations. Architectures that require runtime check should select
+ this option and override arch_has_hw_pte_young().
+
config ARCH_HAS_NONLEAF_PMD_YOUNG
bool
help
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7b071a00425d..12d611f3da5d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -36,6 +36,7 @@ config ARM64
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PTE_DEVMAP
select ARCH_HAS_PTE_SPECIAL
+ select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_SETUP_DMA_OPS
select ARCH_HAS_SET_DIRECT_MAP
select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1566748f16c4..04941a1ffc0a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -88,6 +88,7 @@ config X86
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_PTE_DEVMAP if X86_64
select ARCH_HAS_PTE_SPECIAL
+ select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_NONLEAF_PMD_YOUNG if PGTABLE_LEVELS > 2
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_COPY_MC if X86_64
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 57bab91bbf50..08b5cb22d9a6 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1679,12 +1679,6 @@ static inline bool arch_has_pfn_modify_check(void)
return boot_cpu_has_bug(X86_BUG_L1TF);
}
-#define arch_has_hw_pte_young arch_has_hw_pte_young
-static inline bool arch_has_hw_pte_young(void)
-{
- return true;
-}
-
#define arch_check_zapped_pte arch_check_zapped_pte
void arch_check_zapped_pte(struct vm_area_struct *vma, pte_t pte);
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index af7639c3b0a3..9ecc20fa6269 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -375,7 +375,7 @@ static inline bool arch_has_hw_nonleaf_pmd_young(void)
*/
static inline bool arch_has_hw_pte_young(void)
{
- return false;
+ return IS_ENABLED(CONFIG_ARCH_HAS_HW_PTE_YOUNG);
}
#endif
--
2.43.0.472.g3155946c3a-goog
