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%3Ba=su...
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