From 6e5f0927846adf39aebee450f13871e3cb4ab012 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 15 Sep 2020 22:11:13 +0100 Subject: arm64: Remove Spectre-related CONFIG_* options The spectre mitigations are too configurable for their own good, leading to confusing logic trying to figure out when we should mitigate and when we shouldn't. Although the plethora of command-line options need to stick around for backwards compatibility, the default-on CONFIG options that depend on EXPERT can be dropped, as the mitigations only do anything if the system is vulnerable, a mitigation is available and the command-line hasn't disabled it. Remove CONFIG_HARDEN_BRANCH_PREDICTOR and CONFIG_ARM64_SSBD in favour of enabling this code unconditionally. Signed-off-by: Will Deacon --- arch/arm64/kernel/cpufeature.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'arch/arm64/kernel/cpufeature.c') diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 6424584be01e..4bb45b1d4ae4 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1583,7 +1583,6 @@ static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused) WARN_ON(val & (7 << 27 | 7 << 21)); } -#ifdef CONFIG_ARM64_SSBD static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr) { if (user_mode(regs)) @@ -1623,7 +1622,6 @@ static void cpu_enable_ssbs(const struct arm64_cpu_capabilities *__unused) arm64_set_ssbd_mitigation(true); } } -#endif /* CONFIG_ARM64_SSBD */ #ifdef CONFIG_ARM64_PAN static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) @@ -1976,7 +1974,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .field_pos = ID_AA64ISAR0_CRC32_SHIFT, .min_field_value = 1, }, -#ifdef CONFIG_ARM64_SSBD { .desc = "Speculative Store Bypassing Safe (SSBS)", .capability = ARM64_SSBS, @@ -1988,7 +1985,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .min_field_value = ID_AA64PFR1_SSBS_PSTATE_ONLY, .cpu_enable = cpu_enable_ssbs, }, -#endif #ifdef CONFIG_ARM64_CNP { .desc = "Common not Private translations", -- cgit