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KVM: arm64: Implement non-protected nVHE hyp stack unwinder

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Implements the common framework necessary for unwind() to work
for non-protected nVHE mode:
    - on_accessible_stack()
    - on_overflow_stack()
    - unwind_next()

Non-protected nVHE unwind() is used to unwind and dump the hypervisor
stacktrace by the host in EL1

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/20220726073750.3219117-11-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh
2022-07-26 00:37:43 -07:00
committed by Marc Zyngier
parent 879e5ac7b2
commit db129d486e
3 changed files with 77 additions and 3 deletions
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arch/arm64/include/asm/stacktrace/common.h
+2
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@@ -34,6 +34,7 @@ enum stack_type {
STACK_TYPE_OVERFLOW,
STACK_TYPE_SDEI_NORMAL,
STACK_TYPE_SDEI_CRITICAL,
STACK_TYPE_HYP,
__NR_STACK_TYPES
};
@@ -186,6 +187,7 @@ static inline int unwind_next_common(struct unwind_state *state,
*
* TASK -> IRQ -> OVERFLOW -> SDEI_NORMAL
* TASK -> SDEI_NORMAL -> SDEI_CRITICAL -> OVERFLOW
* HYP -> OVERFLOW
*
* ... but the nesting itself is strict. Once we transition from one
* stack to another, it's never valid to unwind back to that first