linux-kernel - [PATCH] arm64: kpti: Add Broadcom Brahma-B53 core to the KPTI whitelist

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Date:   Mon,  6 Jan 2020 14:54:12 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     bcm-kernel-feedback-list@...adcom.com, opendmb@...il.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dave Martin <Dave.Martin@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Andrew Murray <andrew.murray@....com>,
        Julien Grall <julien.grall@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] arm64: kpti: Add Broadcom Brahma-B53 core to the KPTI whitelist

Broadcom Brahma-B53 CPUs do not implement ID_AA64PFR0_EL1.CSV3 but are
not susceptible to Meltdown, so add all Brahma-B53 part numbers to
kpti_safe_list[].

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 arch/arm64/kernel/cpufeature.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 04cf64e9f0c9..0427b72c960b 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -975,6 +975,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
 	static const struct midr_range kpti_safe_list[] = {
 		MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
 		MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
+		MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
-- 
2.17.1