KVM: arm64: Initialize HCRX_EL2 traps in pKVM

Initialize and set the traps controlled by the HCRX_EL2 in pKVM.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20250314111832.4137161-3-tabba@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: Fuad Tabba

arch/arm64/kvm/hyp/nvhe/pkvm.c

@@ -166,15 +166,21 @@ static int pkvm_vcpu_init_traps(struct pkvm_hyp_vcpu *hyp_vcpu)
 
 	pkvm_vcpu_reset_hcr(vcpu);
 
-	if ((!pkvm_hyp_vcpu_is_protected(hyp_vcpu)))
+	if ((!pkvm_hyp_vcpu_is_protected(hyp_vcpu))) {
+		struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
+
+		/* Trust the host for non-protected vcpu features. */
+		vcpu->arch.hcrx_el2 = host_vcpu->arch.hcrx_el2;
 		return 0;
+	}
 
 	ret = pkvm_check_pvm_cpu_features(vcpu);
 	if (ret)
 		return ret;
 
 	pvm_init_traps_hcr(vcpu);
 	pvm_init_traps_mdcr(vcpu);
+	vcpu_set_hcrx(vcpu);
 
 	return 0;
 }