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4bf9706923
Follow the patterns of the other architectures that use GENERIC_CPU_VULNERABILITIES for riscv to introduce the ghostwrite vulnerability and mitigation. The mitigation is to disable all vector which is accomplished by clearing the bit from the cpufeature field. Ghostwrite only affects thead c9xx CPUs that impelment xtheadvector, so the vulerability will only be mitigated on these CPUs. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Tested-by: Yangyu Chen <cyy@cyyself.name> Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-14-236c22791ef9@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
22 lines
463 B
C
22 lines
463 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Interface for managing mitigations for riscv vulnerabilities.
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*
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* Copyright (C) 2024 Rivos Inc.
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*/
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#ifndef __ASM_BUGS_H
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#define __ASM_BUGS_H
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/* Watch out, ordering is important here. */
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enum mitigation_state {
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UNAFFECTED,
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MITIGATED,
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VULNERABLE,
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};
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void ghostwrite_set_vulnerable(void);
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bool ghostwrite_enable_mitigation(void);
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enum mitigation_state ghostwrite_get_state(void);
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#endif /* __ASM_BUGS_H */
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