[PATCH v6 24/43] KVM: arm64: WARN on injected undef exceptions

[Steven Price <steven.price@xxxxxxx>]

The RMM doesn't allow injection of a undefined exception into a realm
guest. Add a WARN to catch if this ever happens.

Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
 arch/arm64/kvm/inject_fault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index 611867b81ac2..705463058ce0 100644
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -226,6 +226,8 @@ void kvm_inject_size_fault(struct kvm_vcpu *vcpu)
  */
 void kvm_inject_undefined(struct kvm_vcpu *vcpu)
 {
+	if (vcpu_is_rec(vcpu))
+		WARN(1, "Cannot inject undefined exception into REC. Continuing with unknown behaviour");
 	if (vcpu_el1_is_32bit(vcpu))
 		inject_undef32(vcpu);
 	else
-- 
2.43.0