56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* 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 */
|