937fb7003e
Add kuap_lock() and call it when entering interrupts from user. It is called kuap_lock() as it is similar to kuap_save_and_lock() without the save. However book3s/32 already have a kuap_lock(). Rename it kuap_lock_addr(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4437e2deb9f6f549f7089d45e9c6f96a7e77905a.1634627931.git.christophe.leroy@csgroup.eu
91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_KUP_8XX_H_
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#define _ASM_POWERPC_KUP_8XX_H_
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#include <asm/bug.h>
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#include <asm/mmu.h>
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#ifdef CONFIG_PPC_KUAP
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#ifndef __ASSEMBLY__
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#include <linux/jump_label.h>
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#include <asm/reg.h>
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extern struct static_key_false disable_kuap_key;
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static __always_inline bool kuap_is_disabled(void)
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{
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return static_branch_unlikely(&disable_kuap_key);
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}
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static inline void __kuap_lock(void)
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{
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}
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static inline void __kuap_save_and_lock(struct pt_regs *regs)
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{
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regs->kuap = mfspr(SPRN_MD_AP);
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mtspr(SPRN_MD_AP, MD_APG_KUAP);
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}
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static inline void kuap_user_restore(struct pt_regs *regs)
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{
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}
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static inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
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{
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mtspr(SPRN_MD_AP, regs->kuap);
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}
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static inline unsigned long __kuap_get_and_assert_locked(void)
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{
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unsigned long kuap;
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kuap = mfspr(SPRN_MD_AP);
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16);
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return kuap;
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}
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static inline void __allow_user_access(void __user *to, const void __user *from,
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unsigned long size, unsigned long dir)
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{
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mtspr(SPRN_MD_AP, MD_APG_INIT);
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}
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static inline void __prevent_user_access(unsigned long dir)
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{
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mtspr(SPRN_MD_AP, MD_APG_KUAP);
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}
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static inline unsigned long __prevent_user_access_return(void)
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{
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unsigned long flags;
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flags = mfspr(SPRN_MD_AP);
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mtspr(SPRN_MD_AP, MD_APG_KUAP);
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return flags;
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}
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static inline void __restore_user_access(unsigned long flags)
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{
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mtspr(SPRN_MD_AP, flags);
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}
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static inline bool
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__bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
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{
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return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* CONFIG_PPC_KUAP */
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#endif /* _ASM_POWERPC_KUP_8XX_H_ */
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