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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>
This commit is contained in:
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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5
arch/arm64/include/asm/kvm_host.h
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@ -1273,13 +1273,14 @@ void kvm_arm_resume_guest(struct kvm *kvm);
#define vcpu_has_run_once(vcpu) (!!READ_ONCE((vcpu)->pid))
#ifndef __KVM_NVHE_HYPERVISOR__
#define kvm_call_hyp_nvhe(f, ...) \
#define kvm_call_hyp_nvhe(f, ...) \
({ \
struct arm_smccc_res res; \
\
arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(f), \
##__VA_ARGS__, &res); \
WARN_ON(res.a0 != SMCCC_RET_SUCCESS); \
if (WARN_ON(res.a0 != SMCCC_RET_SUCCESS)) \
res.a1 = -EOPNOTSUPP; \
\
res.a1; \
})