[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/riscv: introduce nospec.h
commit 7159164beeb582cb57a3142744d747daae7d59b9 Author: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx> AuthorDate: Thu Feb 29 16:58:34 2024 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Thu Feb 29 16:58:34 2024 +0100 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> Acked-by: Jan Beulich <jbeulich@xxxxxxxx> --- xen/arch/riscv/include/asm/nospec.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/xen/arch/riscv/include/asm/nospec.h b/xen/arch/riscv/include/asm/nospec.h new file mode 100644 index 0000000000..e30f0a781b --- /dev/null +++ b/xen/arch/riscv/include/asm/nospec.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) 2024 Vates */ + +#ifndef _ASM_RISCV_NOSPEC_H +#define _ASM_RISCV_NOSPEC_H + +static inline bool evaluate_nospec(bool condition) +{ + return condition; +} + +static inline void block_speculation(void) +{ +} + +#endif /* _ASM_RISCV_NOSPEC_H */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */ -- generated by git-patchbot for /home/xen/git/xen.git#staging
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