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powerpc: store and restore the pkey state across context switches

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Store and restore the AMR, IAMR and UAMOR register state of the task
before scheduling out and after scheduling in, respectively.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai
2018-01-18 17:50:31 -08:00
committed by Michael Ellerman
parent dcf872956d
commit 06bb53b338
5 changed files with 70 additions and 1 deletions
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4
arch/powerpc/include/asm/pkeys.h
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@@ -139,4 +139,8 @@ static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
}
extern void pkey_mm_init(struct mm_struct *mm);
extern void thread_pkey_regs_save(struct thread_struct *thread);
extern void thread_pkey_regs_restore(struct thread_struct *new_thread,
struct thread_struct *old_thread);
extern void thread_pkey_regs_init(struct thread_struct *thread);
#endif /*_ASM_POWERPC_KEYS_H */