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arm64: proton-pack: Expose whether the branchy loop k value

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Add a helper to expose the k value of the branchy loop. This is needed
by the BPF JIT to generate the mitigation sequence in BPF programs.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
James Morse 2025-04-29 13:55:17 +01:00
parent e7956c92f3
commit a1152be30a
2 changed files with 6 additions and 0 deletions
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1
arch/arm64/include/asm/spectre.h
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@ -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);
u8 get_spectre_bhb_loop_value(void);
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);

5
arch/arm64/kernel/proton-pack.c
View File

@ -999,6 +999,11 @@ bool is_spectre_bhb_affected(const struct arm64_cpu_capabilities *entry,
return true;
}
u8 get_spectre_bhb_loop_value(void)
{
return max_bhb_k;
}
static void this_cpu_set_vectors(enum arm64_bp_harden_el1_vectors slot)
{
const char *v = arm64_get_bp_hardening_vector(slot);