/* 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, NULL); 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_page); void kvm_nvhe_dump_backtrace(unsigned long hyp_offset); #endif /* __KVM_NVHE_HYPERVISOR__ */ #endif /* __ASM_STACKTRACE_NVHE_H */