Commit 573e1e82 authored by Kalesh Singh's avatar Kalesh Singh Committed by Marc Zyngier
Browse files

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



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

Signed-off-by: default avatarKalesh Singh <kaleshsingh@google.com>
Reviewed-by: default avatarFuad Tabba <tabba@google.com>
Tested-by: default avatarFuad Tabba <tabba@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-9-kaleshsingh@google.com
parent 548ec333

arch/arm64/include/asm/stacktrace/nvhe.h

0 → 100644
+47 −0
Original line number Diff line number Diff line 
/* 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 */