From: James Morse Date: Sat, 7 Jun 2025 15:35:30 +0000 (+0000) Subject: arm64: proton-pack: Expose whether the platform is mitigated by firmware X-Git-Tag: v5.15.186~22 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=005f3b7bd3787a2c246f08b7190aa3289378e1dd;p=thirdparty%2Fkernel%2Fstable.git arm64: proton-pack: Expose whether the platform is mitigated by firmware [ Upstream commit e7956c92f396a44eeeb6eaf7a5b5e1ad24db6748 ] is_spectre_bhb_fw_affected() allows the caller to determine if the CPU is known to need a firmware mitigation. CPUs are either on the list of CPUs we know about, or firmware has been queried and reported that the platform is affected - and mitigated by firmware. This helper is not useful to determine if the platform is mitigated by firmware. A CPU could be on the know list, but the firmware may not be implemented. Its affected but not mitigated. spectre_bhb_enable_mitigation() handles this distinction by checking the firmware state before enabling the mitigation. Add a helper to expose this state. This will be used by the BPF JIT to determine if calling firmware for a mitigation is necessary and supported. Signed-off-by: James Morse Reviewed-by: Catalin Marinas Signed-off-by: Pu Lehui Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm64/include/asm/spectre.h b/arch/arm64/include/asm/spectre.h index 6d7f03adece8a..af06d2a4c49c8 100644 --- a/arch/arm64/include/asm/spectre.h +++ b/arch/arm64/include/asm/spectre.h @@ -97,6 +97,7 @@ enum mitigation_state arm64_get_meltdown_state(void); enum mitigation_state arm64_get_spectre_bhb_state(void); bool is_spectre_bhb_affected(const struct arm64_cpu_capabilities *entry, int scope); +bool is_spectre_bhb_fw_mitigated(void); void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *__unused); bool try_emulate_el1_ssbs(struct pt_regs *regs, u32 instr); #endif /* __ASSEMBLY__ */ diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c index df8188193c178..e79ca2c4841d7 100644 --- a/arch/arm64/kernel/proton-pack.c +++ b/arch/arm64/kernel/proton-pack.c @@ -1088,6 +1088,11 @@ void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *entry) update_mitigation_state(&spectre_bhb_state, state); } +bool is_spectre_bhb_fw_mitigated(void) +{ + return test_bit(BHB_FW, &system_bhb_mitigations); +} + /* Patched to NOP when enabled */ void noinstr spectre_bhb_patch_loop_mitigation_enable(struct alt_instr *alt, __le32 *origptr,