[PATCH 4.15 095/163] arm64: Add missing Falkor part number for branch predictor hardening

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shanker Donthineni <shank...@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.zyng...@arm.com>
Signed-off-by: Shanker Donthineni <shank...@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.mari...@arm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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();