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x86/pkeys: Add arch_pkeys_enabled() 

This will be used in future patches to check for arch support for
pkeys in generic code.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
hifive-unleashed-5.1
Michael Ellerman 2018-04-13 23:54:36 +10:00
parent 555934a71b
commit 3f36c94239
1 changed files with 5 additions and 0 deletions
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5
arch/x86/include/asm/pkeys.h
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@ -7,6 +7,11 @@
extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
unsigned long init_val);
static inline bool arch_pkeys_enabled(void)
{
return boot_cpu_has(X86_FEATURE_OSPKE);
}
/*
* Try to dedicate one of the protection keys to be used as an
* execute-only protection key.