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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2021-10-06 01:55:24 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2021-10-07 19:52:58 +1100
commit030905920f32e91a52794937f67434ac0b3ea41a (patch)
treeccb93be5254bdac578b6f9a21194f61757a1a197 /arch
parent5855c4c1f415ca3ba1046e77c0b3d3dfc96c9025 (diff)
downloadlinux-030905920f32e91a52794937f67434ac0b3ea41a.tar.gz
powerpc/security: Add a helper to query stf_barrier type
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
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/security_features.h5
-rw-r--r--arch/powerpc/kernel/security.c5
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h
index 792eefaf230b..27574f218b37 100644
--- 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(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
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 1a998490fe60..15fb5ea1b9ea 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -263,6 +263,11 @@ 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)
{