Commit ff7ebff4 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Borislav Petkov
Browse files

x86/pkru: Provide pkru_write_default() 



Provide a simple and trivial helper which just writes the PKRU default
value without trying to fiddle with the task's xsave buffer.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121455.513729794@linutronix.de
parent 739e2eec

arch/x86/include/asm/pkru.h

+8 −0
Original line number Diff line number Diff line
@@ -60,4 +60,12 @@ static inline void write_pkru(u32 pkru) 
	fpregs_unlock();

}



static inline void pkru_write_default(void)

{

	if (!cpu_feature_enabled(X86_FEATURE_OSPKE))

		return;



	wrpkru(pkru_get_init_value());

}



#endif