[PATCH AUTOSEL 5.10 10/11] powerpc/security: Add a helper to query stf_barrier type

Sasha Levin
2021-10-13T00:56:18Z

From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>

[ 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: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/include/asm/security_features.h | 5 +++++
arch/powerpc/kernel/security.c | 5 +++++
2 files changed, 10 insertions(+)

diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h
index b774a4477d5f..e380acc6e413 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 e4e1a94ccf6a..3f510c911b10 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -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)
{
--
2.33.0