[PATCH v6 03/30] arm64: mm: Enable overlays for all EL1 indirect permissions

Kevin Brodsky
2026-02-27T17:56:01Z

In preparation of using POE inside the kernel, enable "Overlay
applied" for all stage 1 base permissions in PIR_EL1. This ensures
that the permissions set in POR_EL1 affect all kernel mappings.

Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
---
arch/arm64/include/asm/pgtable-prot.h | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
index d27e8872fe3c..849fec1328ae 100644
--- a/arch/arm64/include/asm/pgtable-prot.h
+++ b/arch/arm64/include/asm/pgtable-prot.h
@@ -180,13 +180,13 @@ static inline bool __pure lpa2_is_enabled(void)
PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_GCS), PIE_NONE_O) | \
PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_GCS_RO), PIE_NONE_O) | \
PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_EXECONLY), PIE_NONE_O) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY_EXEC), PIE_R) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY), PIE_R) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED), PIE_RW) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R) | \
- PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW))
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY_EXEC), PIE_R_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY), PIE_R_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED), PIE_RW_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R_O) | \
+ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW_O))

#endif /* __ASM_PGTABLE_PROT_H */
--
2.51.2