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38f9e4b905
Refactor nvhe stack code to use NVHE_STACK_SIZE/SHIFT constants, instead of directly using PAGE_SIZE/SHIFT. This makes the code a bit easier to read, without introducing any functional changes. Cc: Marc Zyngier <maz@kernel.org> Cc: Mark Brown <broonie@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Link: https://lore.kernel.org/r/20241112003336.1375584-1-kaleshsingh@google.com Signed-off-by: Marc Zyngier <maz@kernel.org>
55 lines
1.7 KiB
C
55 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_base);
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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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