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KVM: arm64: Stub implementation of pKVM HYP stack unwinder

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Add some stub implementations of 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/20220726073750.3219117-15-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh 2022-07-26 00:37:47 -07:00 committed by Marc Zyngier
parent 6928bcc84b
commit 25aa73b6db
1 changed files with 33 additions and 2 deletions
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35
arch/arm64/include/asm/stacktrace/nvhe.h
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@ -9,6 +9,10 @@
* 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
@ -49,7 +53,34 @@ static inline bool on_accessible_stack(const struct task_struct *tsk,
return false;
}
#ifndef __KVM_NVHE_HYPERVISOR__
#ifdef __KVM_NVHE_HYPERVISOR__
/*
* Protected nVHE HYP stack unwinder
*
* In protected mode, the unwinding is done by the hypervisor in EL2.
*/
#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE
static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
struct stack_info *info)
{
return false;
}
static inline bool on_hyp_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 /* CONFIG_PROTECTED_NVHE_STACKTRACE */
#else /* !__KVM_NVHE_HYPERVISOR__ */
/*
* Conventional (non-protected) nVHE HYP stack unwinder
*
@ -132,5 +163,5 @@ static inline int notrace unwind_next(struct unwind_state *state)
}
NOKPROBE_SYMBOL(unwind_next);
#endif /* !__KVM_NVHE_HYPERVISOR__ */
#endif /* __KVM_NVHE_HYPERVISOR__ */
#endif /* __ASM_STACKTRACE_NVHE_H */