KVM: arm64: Set a Linux errno on SMCCC error in kvm_call_hyp_nvhe()

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If kvm_call_hyp_nvhe() fails with an SMCCC error code, we WARN().
However, the returned value isn't initialized and the caller might get
garbage or 0 which is likely to be interpreted as success.

Set a default -EOPNOTSUPP error value, ensuring all callers get the
message when hypercalls fail.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260603110312.2909844-1-vdonnefort@google.com
[maz: changed error value to -EOPNOTSUPP as suggested by Will,
 tidied up change log]
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Vincent Donnefort 2026-06-03 12:03:12 +01:00 • committed by Marc Zyngier

parent e72b425f61

commit 3190bd7d36

1 changed files with 3 additions and 2 deletions

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arch/arm64/include/asm/kvm_host.h

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