arm64: errata: Add workaround for Arm errata 3194386 and 3312417
Cortex-X4 and Neoverse-V3 suffer from errata whereby an MSR to the SSBS special-purpose register does not affect subsequent speculative instructions, permitting speculative store bypassing for a window of time. This is described in their Software Developer Errata Notice (SDEN) documents: * Cortex-X4 SDEN v8.0, erratum 3194386: https://developer.arm.com/documentation/SDEN-2432808/0800/ * Neoverse-V3 SDEN v6.0, erratum 3312417: https://developer.arm.com/documentation/SDEN-2891958/0600/ To workaround these errata, it is necessary to place a speculation barrier (SB) after MSR to the SSBS special-purpose register. This patch adds the requisite SB after writes to SSBS within the kernel, and hides the presence of SSBS from EL0 such that userspace software which cares about SSBS will manipulate this via prctl(PR_GET_SPECULATION_CTRL, ...). Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20240508081400.235362-5-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -140,6 +140,8 @@ stable kernels.
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X2 | #2224489 | ARM64_ERRATUM_2224489 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X4 | #3194386 | ARM64_ERRATUM_3194386 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1349291 | N/A |
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@ -156,6 +158,8 @@ stable kernels.
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-V1 | #1619801 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-V3 | #3312417 | ARM64_ERRATUM_3312417 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-500 | #841119,826419 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-600 | #1076982,1209401| N/A |
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@ -1064,6 +1064,48 @@ config ARM64_ERRATUM_3117295
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If unsure, say Y.
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config ARM64_WORKAROUND_SPECULATIVE_SSBS
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bool
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config ARM64_ERRATUM_3194386
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bool "Cortex-X4: 3194386: workaround for MSR SSBS not self-synchronizing"
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select ARM64_WORKAROUND_SPECULATIVE_SSBS
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default y
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help
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This option adds the workaround for ARM Cortex-X4 erratum 3194386.
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On affected cores "MSR SSBS, #0" instructions may not affect
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subsequent speculative instructions, which may permit unexepected
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speculative store bypassing.
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Work around this problem by placing a speculation barrier after
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kernel changes to SSBS. The presence of the SSBS special-purpose
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register is hidden from hwcaps and EL0 reads of ID_AA64PFR1_EL1, such
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that userspace will use the PR_SPEC_STORE_BYPASS prctl to change
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SSBS.
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If unsure, say Y.
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config ARM64_ERRATUM_3312417
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bool "Neoverse-V3: 3312417: workaround for MSR SSBS not self-synchronizing"
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select ARM64_WORKAROUND_SPECULATIVE_SSBS
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default y
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help
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This option adds the workaround for ARM Neoverse-V3 erratum 3312417.
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On affected cores "MSR SSBS, #0" instructions may not affect
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subsequent speculative instructions, which may permit unexepected
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speculative store bypassing.
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Work around this problem by placing a speculation barrier after
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kernel changes to SSBS. The presence of the SSBS special-purpose
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register is hidden from hwcaps and EL0 reads of ID_AA64PFR1_EL1, such
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that userspace will use the PR_SPEC_STORE_BYPASS prctl to change
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SSBS.
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If unsure, say Y.
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config CAVIUM_ERRATUM_22375
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bool "Cavium erratum 22375, 24313"
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default y
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@ -58,6 +58,8 @@ cpucap_is_possible(const unsigned int cap)
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return IS_ENABLED(CONFIG_NVIDIA_CARMEL_CNP_ERRATUM);
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case ARM64_WORKAROUND_REPEAT_TLBI:
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return IS_ENABLED(CONFIG_ARM64_WORKAROUND_REPEAT_TLBI);
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case ARM64_WORKAROUND_SPECULATIVE_SSBS:
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return IS_ENABLED(CONFIG_ARM64_WORKAROUND_SPECULATIVE_SSBS);
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}
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return true;
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@ -432,6 +432,18 @@ static const struct midr_range erratum_spec_unpriv_load_list[] = {
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};
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#endif
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#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_SSBS
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static const struct midr_range erratum_spec_ssbs_list[] = {
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#ifdef CONFIG_ARM64_ERRATUM_3194386
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MIDR_ALL_VERSIONS(MIDR_CORTEX_X4),
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#endif
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#ifdef CONFIG_ARM64_ERRATUM_3312417
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MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3),
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#endif
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{}
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};
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#endif
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const struct arm64_cpu_capabilities arm64_errata[] = {
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#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
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{
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@ -729,6 +741,13 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
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MIDR_FIXED(MIDR_CPU_VAR_REV(1,1), BIT(25)),
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},
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#endif
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#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_SSBS
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{
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.desc = "ARM errata 3194386, 3312417",
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.capability = ARM64_WORKAROUND_SPECULATIVE_SSBS,
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ERRATA_MIDR_RANGE_LIST(erratum_spec_ssbs_list),
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},
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#endif
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#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
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{
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.desc = "ARM errata 2966298, 3117295",
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@ -2307,6 +2307,14 @@ static void user_feature_fixup(void)
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if (regp)
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regp->user_mask &= ~ID_AA64ISAR1_EL1_BF16_MASK;
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}
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if (cpus_have_cap(ARM64_WORKAROUND_SPECULATIVE_SSBS)) {
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struct arm64_ftr_reg *regp;
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regp = get_arm64_ftr_reg(SYS_ID_AA64PFR1_EL1);
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if (regp)
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regp->user_mask &= ~ID_AA64PFR1_EL1_SSBS_MASK;
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}
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}
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static void elf_hwcap_fixup(void)
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@ -558,6 +558,18 @@ static enum mitigation_state spectre_v4_enable_hw_mitigation(void)
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/* SCTLR_EL1.DSSBS was initialised to 0 during boot */
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set_pstate_ssbs(0);
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/*
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* SSBS is self-synchronizing and is intended to affect subsequent
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* speculative instructions, but some CPUs can speculate with a stale
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* value of SSBS.
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*
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* Mitigate this with an unconditional speculation barrier, as CPUs
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* could mis-speculate branches and bypass a conditional barrier.
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*/
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if (IS_ENABLED(CONFIG_ARM64_WORKAROUND_SPECULATIVE_SSBS))
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spec_bar();
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return SPECTRE_MITIGATED;
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}
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@ -102,4 +102,5 @@ WORKAROUND_NVIDIA_CARMEL_CNP
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WORKAROUND_QCOM_FALKOR_E1003
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WORKAROUND_REPEAT_TLBI
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WORKAROUND_SPECULATIVE_AT
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WORKAROUND_SPECULATIVE_SSBS
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WORKAROUND_SPECULATIVE_UNPRIV_LOAD
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