[PATCH v3 38/41] powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr() generic
From: Christophe Leroy <hidden>
Date: 2021-03-12 12:52:18
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
In preparation of porting powerpc32 to C syscall entry/exit, rename kuap_check_amr() and kuap_get_and_check_amr() as kuap_assert_locked() and kuap_get_and_assert_locked(), and move in the generic asm/kup.h the stub for when CONFIG_PPC_KUAP is not selected. Signed-off-by: Christophe Leroy <redacted> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/include/asm/book3s/64/kup.h | 24 ++---------------------- arch/powerpc/include/asm/kup.h | 10 +++++++++- arch/powerpc/kernel/interrupt.c | 12 ++++++------ arch/powerpc/kernel/irq.c | 2 +- 4 files changed, 18 insertions(+), 30 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/kup.h b/arch/powerpc/include/asm/book3s/64/kup.h
index 8bd905050896..9700da3a4093 100644
--- a/arch/powerpc/include/asm/book3s/64/kup.h
+++ b/arch/powerpc/include/asm/book3s/64/kup.h@@ -287,7 +287,7 @@ static inline void kuap_kernel_restore(struct pt_regs *regs, */ } -static inline unsigned long kuap_get_and_check_amr(void) +static inline unsigned long kuap_get_and_assert_locked(void) { if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) { unsigned long amr = mfspr(SPRN_AMR);
@@ -298,27 +298,7 @@ static inline unsigned long kuap_get_and_check_amr(void) return 0; } -#else /* CONFIG_PPC_PKEY */ - -static inline void kuap_user_restore(struct pt_regs *regs) -{ -} - -static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr) -{ -} - -static inline unsigned long kuap_get_and_check_amr(void) -{ - return 0; -} - -#endif /* CONFIG_PPC_PKEY */ - - -#ifdef CONFIG_PPC_KUAP - -static inline void kuap_check_amr(void) +static inline void kuap_assert_locked(void) { if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) WARN_ON_ONCE(mfspr(SPRN_AMR) != AMR_KUAP_BLOCKED);
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index 25671f711ec2..aa5f77459311 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h@@ -74,7 +74,15 @@ bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) return false; } -static inline void kuap_check_amr(void) { } +static inline void kuap_assert_locked(void) { } +static inline void kuap_save_and_lock(struct pt_regs *regs) { } +static inline void kuap_user_restore(struct pt_regs *regs) { } +static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr) { } + +static inline unsigned long kuap_get_and_assert_locked(void) +{ + return 0; +} /* * book3s/64/kup-radix.h defines these functions for the !KUAP case to flush
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 20ace874cd98..a7cb511bf945 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c@@ -76,7 +76,7 @@ notrace long system_call_exception(long r3, long r4, long r5, } else #endif #ifdef CONFIG_PPC64 - kuap_check_amr(); + kuap_assert_locked(); #endif booke_restore_dbcr0();
@@ -254,7 +254,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3, CT_WARN_ON(ct_state() == CONTEXT_USER); #ifdef CONFIG_PPC64 - kuap_check_amr(); + kuap_assert_locked(); #endif regs->result = r3;
@@ -380,7 +380,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned * AMR can only have been unlocked if we interrupted the kernel. */ #ifdef CONFIG_PPC64 - kuap_check_amr(); + kuap_assert_locked(); #endif local_irq_save(flags);
@@ -451,7 +451,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign unsigned long flags; unsigned long ret = 0; #ifdef CONFIG_PPC64 - unsigned long amr; + unsigned long kuap; #endif if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x) &&
@@ -467,7 +467,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign CT_WARN_ON(ct_state() == CONTEXT_USER); #ifdef CONFIG_PPC64 - amr = kuap_get_and_check_amr(); + kuap = kuap_get_and_assert_locked(); #endif if (unlikely(current_thread_info()->flags & _TIF_EMULATE_STACK_STORE)) {
@@ -511,7 +511,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign * value from the check above. */ #ifdef CONFIG_PPC64 - kuap_kernel_restore(regs, amr); + kuap_kernel_restore(regs, kuap); #endif return ret;
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index d71fd10a1dd4..5b72abbff96c 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c@@ -282,7 +282,7 @@ static inline void replay_soft_interrupts_irqrestore(void) * and re-locking AMR but we shouldn't get here in the first place, * hence the warning. */ - kuap_check_amr(); + kuap_assert_locked(); if (kuap_state != AMR_KUAP_BLOCKED) set_kuap(AMR_KUAP_BLOCKED);
--
2.25.0