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/* 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 */
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