linux-kernel - [PATCH] ARM: spectre-v2: remove Brahma-B53 from hardening

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Message-Id: <20191031220053.2720-1-f.fainelli@gmail.com>
Date:   Thu, 31 Oct 2019 15:00:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     bcm-kernel-feedback-list@...adcom.com, catalin.marinas@....com,
        will@...nel.org, Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ARM: spectre-v2: remove Brahma-B53 from hardening

From: Doug Berger <opendmb@...il.com>

When the default processor handling was added to the function
cpu_v7_spectre_init() it only excluded other ARM implemented processor
cores. The Broadcom Brahma B53 core is not implemented by ARM so it
ended up falling through into the set of processors that attempt to use
the ARM_SMCCC_ARCH_WORKAROUND_1 service to harden the branch predictor.

Since this workaround is not necessary for the Brahma-B53 this commit
explicitly checks for it and prevents it from applying a branch
predictor hardening workaround.

Fixes: 10115105cb3a ("ARM: spectre-v2: add firmware based hardening")
Signed-off-by: Doug Berger <opendmb@...il.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 arch/arm/mm/proc-v7-bugs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c
index 9a07916af8dd..a6554fdb56c5 100644
--- a/arch/arm/mm/proc-v7-bugs.c
+++ b/arch/arm/mm/proc-v7-bugs.c
@@ -65,6 +65,9 @@ static void cpu_v7_spectre_init(void)
 		break;
 
 #ifdef CONFIG_ARM_PSCI
+	case ARM_CPU_PART_BRAHMA_B53:
+		/* Requires no workaround */
+		break;
 	default:
 		/* Other ARM CPUs require no workaround */
 		if (read_cpuid_implementor() == ARM_CPU_IMP_ARM)
-- 
2.17.1