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Commit 600ab456 authored by Naveen N. Rao's avatar Naveen N. Rao Committed by Greg Kroah-Hartman
Browse files

powerpc/security: Add a helper to query stf_barrier type 



upstream commit 030905920f32e91a52794937f67434ac0b3ea41a

Add a helper to return the stf_barrier type for the current processor.

Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3bd5d7f96ea1547991ac2ce3137dc2b220bae285.1633464148.git.naveen.n.rao@linux.vnet.ibm.com


Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7eea9433

arch/powerpc/include/asm/security_features.h

+5 −0
Original line number Diff line number Diff line
@@ -39,6 +39,11 @@ static inline bool security_ftr_enabled(unsigned long feature) 
	return !!(powerpc_security_features & feature);

}



#ifdef CONFIG_PPC_BOOK3S_64

enum stf_barrier_type stf_barrier_type_get(void);

#else

static inline enum stf_barrier_type stf_barrier_type_get(void) { return STF_BARRIER_NONE; }

#endif



// Features indicating support for Spectre/Meltdown mitigations

arch/powerpc/kernel/security.c

+5 −0
Original line number Diff line number Diff line
@@ -248,6 +248,11 @@ static int __init handle_no_stf_barrier(char *p) 


early_param("no_stf_barrier", handle_no_stf_barrier);



enum stf_barrier_type stf_barrier_type_get(void)

{

	return stf_enabled_flush_types;

}



/* This is the generic flag used by other architectures */

static int __init handle_ssbd(char *p)

{