^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Interface for managing mitigations for Spectre vulnerabilities.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2020 Google LLC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Will Deacon <will@kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #ifndef __ASM_SPECTRE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define __ASM_SPECTRE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define BP_HARDEN_EL2_SLOTS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define __BP_HARDEN_HYP_VECS_SZ ((BP_HARDEN_EL2_SLOTS - 1) * SZ_2K)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/virt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Watch out, ordering is important here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) enum mitigation_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) SPECTRE_UNAFFECTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) SPECTRE_MITIGATED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) SPECTRE_VULNERABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct task_struct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Note: the order of this enum corresponds to __bp_harden_hyp_vecs and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * we rely on having the direct vectors first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) enum arm64_hyp_spectre_vector {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Take exceptions directly to __kvm_hyp_vector. This must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * 0 so that it used by default when mitigations are not needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) HYP_VECTOR_DIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Bounce via a slot in the hypervisor text mapping of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * __bp_harden_hyp_vecs, which contains an SMC call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) HYP_VECTOR_SPECTRE_DIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Bounce via a slot in a special mapping of __bp_harden_hyp_vecs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * next to the idmap page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) HYP_VECTOR_INDIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Bounce via a slot in a special mapping of __bp_harden_hyp_vecs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * next to the idmap page, which contains an SMC call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) HYP_VECTOR_SPECTRE_INDIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) typedef void (*bp_hardening_cb_t)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct bp_hardening_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) enum arm64_hyp_spectre_vector slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) bp_hardening_cb_t fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static inline void arm64_apply_bp_hardening(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct bp_hardening_data *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!cpus_have_const_cap(ARM64_SPECTRE_V2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) d = this_cpu_ptr(&bp_hardening_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (d->fn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) d->fn();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) enum mitigation_state arm64_get_spectre_v2_state(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) bool has_spectre_v2(const struct arm64_cpu_capabilities *cap, int scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) void spectre_v2_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) bool has_spectre_v3a(const struct arm64_cpu_capabilities *cap, int scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) void spectre_v3a_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) enum mitigation_state arm64_get_spectre_v4_state(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) void spectre_v4_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) void spectre_v4_enable_task_mitigation(struct task_struct *tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) enum mitigation_state arm64_get_meltdown_state(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) enum mitigation_state arm64_get_spectre_bhb_state(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) bool is_spectre_bhb_affected(const struct arm64_cpu_capabilities *entry, int scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) u8 spectre_bhb_loop_affected(int scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #endif /* __ASSEMBLY__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #endif /* __ASM_SPECTRE_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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