[PATCH v4 4/6] kvm: irqchip: extract kvm_irqchip_add_deferred_msi_route

["Longpeng(Mike)" <longpeng2@huawei.com>]

Extract a common helper that add MSI route for specific vector
but does not commit immediately.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
---
 accel/kvm/kvm-all.c  | 15 +++++++++++++--
 include/sysemu/kvm.h |  6 ++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index db8d83b..8627f7c 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1953,7 +1953,7 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
     return kvm_set_irq(s, route->kroute.gsi, 1);
 }
 
-int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
+int kvm_irqchip_add_deferred_msi_route(KVMState *s, int vector, PCIDevice *dev)
 {
     struct kvm_irq_routing_entry kroute = {};
     int virq;
@@ -1996,7 +1996,18 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
 
     kvm_add_routing_entry(s, &kroute);
     kvm_arch_add_msi_route_post(&kroute, vector, dev);
-    kvm_irqchip_commit_routes(s);
+
+    return virq;
+}
+
+int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
+{
+    int virq;
+
+    virq = kvm_irqchip_add_deferred_msi_route(s, vector, dev);
+    if (virq >= 0) {
+        kvm_irqchip_commit_routes(s);
+    }
 
     return virq;
 }
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index a1ab1ee..8de0d9a 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -476,6 +476,12 @@ void kvm_init_cpu_signals(CPUState *cpu);
  * @return: virq (>=0) when success, errno (<0) when failed.
  */
 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev);
+/**
+ * Add MSI route for specific vector but does not commit to KVM
+ * immediately
+ */
+int kvm_irqchip_add_deferred_msi_route(KVMState *s, int vector,
+                                       PCIDevice *dev);
 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
                                  PCIDevice *dev);
 void kvm_irqchip_commit_routes(KVMState *s);
-- 
1.8.3.1