[PATCH 4.19 240/323] powerpc/security: Add a helper to query stf_barrier type
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-11-24 13:09:47
Also in:
lkml
From: "Naveen N. Rao" <redacted> upstream commit 030905920f32e91a52794937f67434ac0b3ea41a Add a helper to return the stf_barrier type for the current processor. Signed-off-by: Naveen N. Rao <redacted> 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 (local) Signed-off-by: Naveen N. Rao <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/powerpc/include/asm/security_features.h | 5 +++++ arch/powerpc/kernel/security.c | 5 +++++ 2 files changed, 10 insertions(+)
--- a/arch/powerpc/include/asm/security_features.h
+++ b/arch/powerpc/include/asm/security_features.h@@ -39,6 +39,11 @@ static inline bool security_ftr_enabled( 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 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c
@@ -248,6 +248,11 @@ static int __init handle_no_stf_barrier( 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) {