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powerpc/security: Add a helper to query stf_barrier type

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upstream commit 030905920f32e91a52794937f67434ac0b3ea41a

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

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3bd5d7f96ea1547991ac2ce3137dc2b220bae285.1633464148.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao 2021-11-15 16:36:29 +05:30 committed by Greg Kroah-Hartman
parent 951fb7bf38
commit 7fcf86565b
2 changed files with 10 additions and 0 deletions
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5
arch/powerpc/include/asm/security_features.h
View File

@ -39,6 +39,11 @@ static inline bool security_ftr_enabled(u64 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

5
arch/powerpc/kernel/security.c
View File

@ -261,6 +261,11 @@ 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)
{