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Message-Id: <e1605b9cbc5b0ad3f60d9c3733b03c55cb96563e.1687430631.git.christophe.leroy@csgroup.eu>
Date: Thu, 22 Jun 2023 12:54:25 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Sathvika Vasireddy <sv@...ux.ibm.com>,
Naveen N Rao <naveen@...nel.org>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 03/14] powerpc/kuap: Refactor static branch for disabling kuap
All but book3s/64 use a static branch key for disabling kuap.
book3s/64 uses a memory feature.
Refactor all targets except book3s/64.
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
arch/powerpc/include/asm/book3s/32/kup.h | 7 -------
arch/powerpc/include/asm/book3s/64/kup.h | 1 +
arch/powerpc/include/asm/kup.h | 15 +++++++++++++++
arch/powerpc/include/asm/nohash/32/kup-8xx.h | 7 -------
arch/powerpc/include/asm/nohash/kup-booke.h | 7 -------
arch/powerpc/mm/book3s32/kuap.c | 3 ---
arch/powerpc/mm/init-common.c | 3 +++
arch/powerpc/mm/nohash/kup.c | 3 ---
8 files changed, 19 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index 466a19cfb4df..8da9997a67ba 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -11,8 +11,6 @@
#include <linux/jump_label.h>
-extern struct static_key_false disable_kuap_key;
-
static __always_inline bool kuep_is_disabled(void)
{
return !IS_ENABLED(CONFIG_PPC_KUEP);
@@ -25,11 +23,6 @@ static __always_inline bool kuep_is_disabled(void)
#define KUAP_NONE (~0UL)
#define KUAP_ALL (~1UL)
-static __always_inline bool kuap_is_disabled(void)
-{
- return static_branch_unlikely(&disable_kuap_key);
-}
-
static inline void kuap_lock_one(unsigned long addr)
{
mtsr(mfsr(addr) | SR_KS, addr);
diff --git a/arch/powerpc/include/asm/book3s/64/kup.h b/arch/powerpc/include/asm/book3s/64/kup.h
index 2a7bd3ecc556..d44c4ee2e8c3 100644
--- a/arch/powerpc/include/asm/book3s/64/kup.h
+++ b/arch/powerpc/include/asm/book3s/64/kup.h
@@ -234,6 +234,7 @@ static __always_inline bool kuap_is_disabled(void)
{
return !mmu_has_feature(MMU_FTR_BOOK3S_KUAP);
}
+#define kuap_is_disabled kuap_is_disabled
static inline void kuap_user_restore(struct pt_regs *regs)
{
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index 0a4e07175612..74b7f4cee2ed 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -6,6 +6,12 @@
#define KUAP_WRITE 2
#define KUAP_READ_WRITE (KUAP_READ | KUAP_WRITE)
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+static __always_inline bool kuap_is_disabled(void);
+#endif
+
#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/book3s/64/kup.h>
#endif
@@ -41,6 +47,15 @@ void setup_kuep(bool disabled);
#ifdef CONFIG_PPC_KUAP
void setup_kuap(bool disabled);
+
+#ifndef kuap_is_disabled
+extern struct static_key_false disable_kuap_key;
+
+static __always_inline bool kuap_is_disabled(void)
+{
+ return static_branch_unlikely(&disable_kuap_key);
+}
+#endif
#else
static inline void setup_kuap(bool disabled) { }
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index a372cd822887..1d53f38c5cd5 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -13,13 +13,6 @@
#include <asm/reg.h>
-extern struct static_key_false disable_kuap_key;
-
-static __always_inline bool kuap_is_disabled(void)
-{
- return static_branch_unlikely(&disable_kuap_key);
-}
-
static inline void __kuap_save_and_lock(struct pt_regs *regs)
{
regs->kuap = mfspr(SPRN_MD_AP);
diff --git a/arch/powerpc/include/asm/nohash/kup-booke.h b/arch/powerpc/include/asm/nohash/kup-booke.h
index 71182cbe20c3..07759ae9117b 100644
--- a/arch/powerpc/include/asm/nohash/kup-booke.h
+++ b/arch/powerpc/include/asm/nohash/kup-booke.h
@@ -18,13 +18,6 @@
#include <asm/reg.h>
-extern struct static_key_false disable_kuap_key;
-
-static __always_inline bool kuap_is_disabled(void)
-{
- return static_branch_unlikely(&disable_kuap_key);
-}
-
static inline void __kuap_lock(void)
{
mtspr(SPRN_PID, 0);
diff --git a/arch/powerpc/mm/book3s32/kuap.c b/arch/powerpc/mm/book3s32/kuap.c
index 28676cabb005..c5484729b595 100644
--- a/arch/powerpc/mm/book3s32/kuap.c
+++ b/arch/powerpc/mm/book3s32/kuap.c
@@ -3,9 +3,6 @@
#include <asm/kup.h>
#include <asm/smp.h>
-struct static_key_false disable_kuap_key;
-EXPORT_SYMBOL(disable_kuap_key);
-
void kuap_lock_all_ool(void)
{
kuap_lock_all();
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index 119ef491f797..74e140b1efef 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c
@@ -32,6 +32,9 @@ EXPORT_SYMBOL_GPL(kernstart_virt_addr);
bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP);
bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);
+struct static_key_false disable_kuap_key;
+EXPORT_SYMBOL(disable_kuap_key);
+
static int __init parse_nosmep(char *p)
{
if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64))
diff --git a/arch/powerpc/mm/nohash/kup.c b/arch/powerpc/mm/nohash/kup.c
index 552becf90e97..4e22adfa2aa8 100644
--- a/arch/powerpc/mm/nohash/kup.c
+++ b/arch/powerpc/mm/nohash/kup.c
@@ -13,9 +13,6 @@
#include <asm/smp.h>
#ifdef CONFIG_PPC_KUAP
-struct static_key_false disable_kuap_key;
-EXPORT_SYMBOL(disable_kuap_key);
-
void setup_kuap(bool disabled)
{
if (disabled) {
--
2.40.1
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