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1beef60e7d
On arm64 we share some unwinding code between the regular kernel unwinder and the KVM hyp unwinder. Some of this common code only matters to the regular unwinder, e.g. the `kr_cur` and `task` fields in the common struct unwind_state. We're likely to add more state which only matters for regular kernel unwinding (or only for hyp unwinding). In preparation for such changes, this patch factors out the kernel-specific state into a new struct kunwind_state, and updates the kernel unwind code accordingly. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> Cc: Mark Brown <broonie@kernel.org> Cc: Puranjay Mohan <puranjay12@gmail.com> Cc: Will Deacon <will@kernel.org> Reviewed-by: Puranjay Mohan <puranjay12@gmail.com> Reviewed-by: Kalesh Singh <kaleshsingh@google.com> Reviewed-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20231124110511.2795958-2-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* KVM nVHE hypervisor stack tracing support.
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*
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* The unwinder implementation depends on the nVHE mode:
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*
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* 1) Non-protected nVHE mode - the host can directly access the
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* HYP stack pages and unwind the HYP stack in EL1. This saves having
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* to allocate shared buffers for the host to read the unwinded
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* stacktrace.
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*
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* 2) pKVM (protected nVHE) mode - the host cannot directly access
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* the HYP memory. The stack is unwinded in EL2 and dumped to a shared
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* buffer where the host can read and print the stacktrace.
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*
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* Copyright (C) 2022 Google LLC
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*/
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#ifndef __ASM_STACKTRACE_NVHE_H
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#define __ASM_STACKTRACE_NVHE_H
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#include <asm/stacktrace/common.h>
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/**
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* kvm_nvhe_unwind_init() - Start an unwind from the given nVHE HYP fp and pc
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*
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* @state : unwind_state to initialize
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* @fp : frame pointer at which to start the unwinding.
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* @pc : program counter at which to start the unwinding.
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*/
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static inline void kvm_nvhe_unwind_init(struct unwind_state *state,
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unsigned long fp,
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unsigned long pc)
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{
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unwind_init_common(state);
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state->fp = fp;
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state->pc = pc;
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}
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#ifndef __KVM_NVHE_HYPERVISOR__
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/*
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* Conventional (non-protected) nVHE HYP stack unwinder
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*
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* In non-protected mode, the unwinding is done from kernel proper context
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* (by the host in EL1).
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*/
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DECLARE_KVM_NVHE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
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DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_stacktrace_info, kvm_stacktrace_info);
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DECLARE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
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void kvm_nvhe_dump_backtrace(unsigned long hyp_offset);
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#endif /* __KVM_NVHE_HYPERVISOR__ */
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#endif /* __ASM_STACKTRACE_NVHE_H */
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