[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v5 03/23] xen/riscv: introduce nospec.h
>From the unpriviliged doc: No standard hints are presently defined. We anticipate standard hints to eventually include memory-system spatial and temporal locality hints, branch prediction hints, thread-scheduling hints, security tags, and instrumentation flags for simulation/emulation. Also, there are no speculation execution barriers. Therefore, functions evaluate_nospec() and block_speculation() should remain empty until a specific platform has an extension to deal with speculation execution. Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx> --- Changes in V5: - new patch --- xen/arch/riscv/include/asm/nospec.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 xen/arch/riscv/include/asm/nospec.h diff --git a/xen/arch/riscv/include/asm/nospec.h b/xen/arch/riscv/include/asm/nospec.h new file mode 100644 index 0000000000..4fb404a0a2 --- /dev/null +++ b/xen/arch/riscv/include/asm/nospec.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2024 Vates */ + +#ifndef _ASM_GENERIC_NOSPEC_H +#define _ASM_GENERIC_NOSPEC_H + +static inline bool evaluate_nospec(bool condition) +{ + return condition; +} + +static inline void block_speculation(void) +{ +} + +#endif /* _ASM_GENERIC_NOSPEC_H */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */ -- 2.43.0
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