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@gmail.com>
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 04cf64e..0427b72 100644 (file)
--- 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),