Option kernel_irqchip=split is not supported on LoongArch virt machine,
report error and exit if detect split kernel_irqchip option.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 target/loongarch/kvm/kvm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index 1bda570482..6e04dfc999 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -1249,7 +1249,12 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
 
 int kvm_arch_irqchip_create(KVMState *s)
 {
-    return 0;
+    if (kvm_kernel_irqchip_split()) {
+        error_report("kernel_irqchip=split is not supported on LoongArch");
+        exit(1);
+    }
+
+    return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL);
 }
 
 void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
-- 
2.39.3