From: Will Deacon Date: Tue, 30 Apr 2019 15:58:56 +0000 (+0100) Subject: arm64: ssbs: Don't treat CPUs with SSBS as unaffected by SSB X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=eb337cdfcd5dd3b10522c2f34140a73a4c285c30;p=openwrt%2Fstaging%2Fblogic.git arm64: ssbs: Don't treat CPUs with SSBS as unaffected by SSB SSBS provides a relatively cheap mitigation for SSB, but it is still a mitigation and its presence does not indicate that the CPU is unaffected by the vulnerability. Tweak the mitigation logic so that we report the correct string in sysfs. Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 4bb0f7cad418..44ef98be001e 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -386,15 +386,17 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible()); + /* delay setting __ssb_safe until we get a firmware response */ + if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list)) + this_cpu_safe = true; + if (this_cpu_has_cap(ARM64_SSBS)) { + if (!this_cpu_safe) + __ssb_safe = false; required = false; goto out_printmsg; } - /* delay setting __ssb_safe until we get a firmware response */ - if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list)) - this_cpu_safe = true; - if (psci_ops.smccc_version == SMCCC_VERSION_1_0) { ssbd_state = ARM64_SSBD_UNKNOWN; if (!this_cpu_safe)