Messages in this thread Patch in this message | | | Date | Tue, 26 Jul 2022 00:37:41 -0700 | Subject | [PATCH v6 08/17] 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> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> ---
Changes in v6: - Add Fuad’s Reviewed-by and Tested-by tags
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 | 47 ++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 arch/arm64/include/asm/stacktrace/nvhe.h
diff --git a/arch/arm64/include/asm/stacktrace/nvhe.h b/arch/arm64/include/asm/stacktrace/nvhe.h new file mode 100644 index 000000000000..1192ae0f80c1 --- /dev/null +++ b/arch/arm64/include/asm/stacktrace/nvhe.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * KVM nVHE hypervisor stack tracing support. + * + * The unwinder implementation depends on the nVHE mode: + * + * 1) 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 +#define __ASM_STACKTRACE_NVHE_H + +#include <asm/stacktrace/common.h> + +static inline bool on_accessible_stack(const struct task_struct *tsk, + unsigned long sp, unsigned long size, + struct stack_info *info) +{ + return false; +} + +#ifndef __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 */ -- 2.37.1.359.gd136c6c3e2-goog
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