* [PATCH AUTOSEL 5.4 6/6] powerpc/security: Add a helper to query stf_barrier type
[not found] <20211013005603.700363-1-sashal@kernel.org>
@ 2021-10-13 0:56 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-10-13 0:56 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sasha Levin, lihuafei1, aik, npiggin, aneesh.kumar, Naveen N. Rao,
linuxppc-dev, dja
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 e9e3f85134e5..316a9c8d1929 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 1740a66cea84..ff022e725693 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -256,6 +256,11 @@ 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
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