Messages in this thread Patch in this message | | | Date | Wed, 20 Jul 2022 22:57:22 -0700 | Subject | [PATCH v5 11/17] KVM: arm64: Stub implementation of non-protected nVHE HYP stack unwinder | From | Kalesh Singh <> |
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Add stub implementations of non-protected nVHE stack unwinder, for building. These are implemented later in this series.
Signed-off-by: Kalesh Singh <kaleshsingh@google.com> ---
Changes in v5: - Mark unwind_next() as inline, per Marc - Comment !__KVM_NVHE_HYPERVISOR__ unwinder path, per Marc
arch/arm64/include/asm/stacktrace/nvhe.h | 26 ++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/arch/arm64/include/asm/stacktrace/nvhe.h b/arch/arm64/include/asm/stacktrace/nvhe.h index 80d71932afff..3078501f8e22 100644 --- a/arch/arm64/include/asm/stacktrace/nvhe.h +++ b/arch/arm64/include/asm/stacktrace/nvhe.h @@ -8,6 +8,12 @@ * the HYP memory. The stack is unwinded in EL2 and dumped to a shared * buffer where the host can read and print the stacktrace. * + * 2) Non-protected nVHE mode - the host can directly access the + * HYP stack pages and unwind the HYP stack in EL1. This saves having + * to allocate shared buffers for the host to read the unwinded + * stacktrace. + * + * * Copyright (C) 2022 Google LLC */ #ifndef __ASM_STACKTRACE_NVHE_H @@ -55,5 +61,25 @@ static inline int notrace unwind_next(struct unwind_state *state) NOKPROBE_SYMBOL(unwind_next); #endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ +#else /* !__KVM_NVHE_HYPERVISOR__ */ +/* + * Conventional (non-protected) nVHE HYP stack unwinder + * + * In non-protected mode, the unwinding is done from kernel proper context + * (by the host in EL1). + */ + +static inline bool on_overflow_stack(unsigned long sp, unsigned long size, + struct stack_info *info) +{ + return false; +} + +static inline int notrace unwind_next(struct unwind_state *state) +{ + return 0; +} +NOKPROBE_SYMBOL(unwind_next); + #endif /* __KVM_NVHE_HYPERVISOR__ */ #endif /* __ASM_STACKTRACE_NVHE_H */ -- 2.37.0.170.g444d1eabd0-goog
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