Patch "[Variant 2/Spectre-v2] arm64: Branch predictor hardening for Cavium ThunderX2" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

[Variant 2/Spectre-v2] arm64: Branch predictor hardening for Cavium ThunderX2

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
arm64-branch-predictor-hardening-for-cavium-thunderx2.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Jayachandran C <[email protected]>
Date: Fri, 19 Jan 2018 04:22:47 -0800
Subject: [Variant 2/Spectre-v2] arm64: Branch predictor hardening for Cavium ThunderX2

From: Jayachandran C <[email protected]>

Commit f3d795d9b360 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.

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

@@ -359,6 +359,16 @@ const struct arm64_cpu_capabilities arm6
 		.capability = ARM64_HARDEN_BP_POST_GUEST_EXIT,
 		MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR_V1),
 	},
+	{
+		.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
 	{
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/arm64-turn-on-kpti-only-on-cpus-that-need-it.patch queue-4.14/arm64-branch-predictor-hardening-for-cavium-thunderx2.patch queue-4.14/arm64-cputype-add-midr-values-for-cavium-thunderx2-cpus.patch