/* 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. * *   2) pKVM (protected nVHE) mode - the host cannot directly access *      the HYP memory. The stack is unwinded in EL2 and dumped to a shared *      buffer where the host can read and print the stacktrace. * * Copyright (C) 2022 Google LLC */#ifndef __ASM_STACKTRACE_NVHE_H#define __ASM_STACKTRACE_NVHE_H #include <asm/stacktrace/common.h> /** * kvm_nvhe_unwind_init() - Start an unwind from the given nVHE HYP fp and pc * * @state : unwind_state to initialize * @fp    : frame pointer at which to start the unwinding. * @pc    : program counter at which to start the unwinding. */static inline void kvm_nvhe_unwind_init(struct unwind_state *state,					unsigned long fp,					unsigned long pc){	unwind_init_common(state); 	state->fp = fp;	state->pc = pc;} #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). */ DECLARE_KVM_NVHE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_stacktrace_info, kvm_stacktrace_info);DECLARE_PER_CPU(unsigned long, kvm_arm_hyp_stack_base); void kvm_nvhe_dump_backtrace(unsigned long hyp_offset); #endif	/* __KVM_NVHE_HYPERVISOR__ */#endif	/* __ASM_STACKTRACE_NVHE_H */