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[ARM64,v4.4,V3,34/44] arm64: Branch predictor hardening for Cavium ThunderX2

Message ID 428a36a4c7d91a280917ec2a65b16ab0cb11bb6b.1567077734.git.viresh.kumar@linaro.org
State New
Headers show
Series V4.4 backport of arm64 Spectre patches | expand

Commit Message

Viresh Kumar Aug. 29, 2019, 11:34 a.m. UTC 
From: Jayachandran C <jnair@caviumnetworks.com>


commit f3d795d9b360523beca6d13ba64c2c532f601149 upstream.

Use PSCI based mitigation for speculative execution attacks targeting
the branch predictor. We use the same mechanism as the one used for
Cortex-A CPUs, we expect the PSCI version call to have a side effect
of clearing the BTBs.

Acked-by: Will Deacon <will.deacon@arm.com>

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

---
 arch/arm64/kernel/cpu_errata.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

-- 
2.21.0.rc0.269.g1a574e7a288b
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Patch

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index dbd7b944a37e..ff22915a2865 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -234,6 +234,16 @@  const struct arm64_cpu_capabilities arm64_errata[] = {
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
 		.enable = enable_psci_bp_hardening,
 	},
+	{
+		.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
+		MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
+		.enable = enable_psci_bp_hardening,
+	},
+	{
+		.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
+		MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
+		.enable = enable_psci_bp_hardening,
+	},
 #endif
 	{
 	}