Commit 25aa73b6 authored by Kalesh Singh's avatar Kalesh Singh Committed by Marc Zyngier
Browse files

KVM: arm64: Stub implementation of pKVM HYP stack unwinder 



Add some stub implementations of 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/20220726073750.3219117-15-kaleshsingh@google.com
parent 6928bcc8

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

+33 −2
Original line number Diff line number Diff line
@@ -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 */