Patch "arm64: Add missing Falkor part number for branch predictor hardening" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

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

    arm64: Add missing Falkor part number for branch predictor hardening

to the 4.15-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-add-missing-falkor-part-number-for-branch-predictor-hardening.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 16e574d762ac5512eb922ac0ac5eed360b7db9d8 Mon Sep 17 00:00:00 2001
From: Shanker Donthineni <shankerd@codeaurora.org>
Date: Sun, 11 Feb 2018 19:16:15 -0600
Subject: arm64: Add missing Falkor part number for branch predictor hardening

From: Shanker Donthineni <shankerd@codeaurora.org>

commit 16e574d762ac5512eb922ac0ac5eed360b7db9d8 upstream.

References to CPU part number MIDR_QCOM_FALKOR were dropped from the
mailing list patch due to mainline/arm64 branch dependency. So this
patch adds the missing part number.

Fixes: ec82b567a74f ("arm64: Implement branch predictor hardening for Falkor")
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/kernel/cpu_errata.c |    9 +++++++++
 arch/arm64/kvm/hyp/switch.c    |    4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -408,6 +408,15 @@ const struct arm64_cpu_capabilities arm6
 	},
 	{
 		.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
+		MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR),
+		.enable = qcom_enable_link_stack_sanitization,
+	},
+	{
+		.capability = ARM64_HARDEN_BP_POST_GUEST_EXIT,
+		MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR),
+	},
+	{
+		.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
 		MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
 		.enable = enable_smccc_arch_workaround_1,
 	},
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -400,8 +400,10 @@ again:
 		u32 midr = read_cpuid_id();
 
 		/* Apply BTAC predictors mitigation to all Falkor chips */
-		if ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1)
+		if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) ||
+		    ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1)) {
 			__qcom_hyp_sanitize_btac_predictors();
+		}
 	}
 
 	fp_enabled = __fpsimd_enabled();


Patches currently in stable-queue which might be from shankerd@codeaurora.org are

queue-4.15/arm64-add-missing-falkor-part-number-for-branch-predictor-hardening.patch