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KVM: arm64: Stub implementation of non-protected nVHE HYP stack unwinder

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Add stub implementations of non-protected nVHE stack unwinder, for
building. These are implemented later in this series.

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-9-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh 2022-07-26 00:37:41 -07:00 committed by Marc Zyngier
parent 548ec3336f
commit 573e1e8275
1 changed files with 47 additions and 0 deletions
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47
arch/arm64/include/asm/stacktrace/nvhe.h Normal file
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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.
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __ASM_STACKTRACE_NVHE_H
#define __ASM_STACKTRACE_NVHE_H
#include <asm/stacktrace/common.h>
static inline bool on_accessible_stack(const struct task_struct *tsk,
unsigned long sp, unsigned long size,
struct stack_info *info)
{
return false;
}
#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).
*/
static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
struct stack_info *info)
{
return false;
}
static inline int notrace unwind_next(struct unwind_state *state)
{
return 0;
}
NOKPROBE_SYMBOL(unwind_next);
#endif /* !__KVM_NVHE_HYPERVISOR__ */
#endif /* __ASM_STACKTRACE_NVHE_H */