[Qemu-devel] [PATCH v6 26/26] kvm-irqchip: do explicit commit when update irq

[Peter Xu <peterx@redhat.com>]

In the past, we are doing gsi route commit for each irqchip route
update. This is not efficient if we are updating lots of routes in the
same time. This patch removes the committing phase in
kvm_irqchip_update_msi_route(). Instead, we do explicit commit after all
routes updated.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/kvm/pci-assign.c | 2 ++
 hw/misc/ivshmem.c        | 1 +
 hw/vfio/pci.c            | 1 +
 hw/virtio/virtio-pci.c   | 1 +
 include/sysemu/kvm.h     | 2 +-
 kvm-all.c                | 2 --
 kvm-stub.c               | 4 ++++
 target-i386/kvm.c        | 1 +
 8 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c
index 85caf37..3615916 100644
--- a/hw/i386/kvm/pci-assign.c
+++ b/hw/i386/kvm/pci-assign.c
@@ -1015,6 +1015,7 @@ static void assigned_dev_update_msi_msg(PCIDevice *pci_dev)
 
     kvm_irqchip_update_msi_route(kvm_state, assigned_dev->msi_virq[0],
                                  msi_get_message(pci_dev, 0), pci_dev);
+    kvm_irqchip_commit_routes(kvm_state);
 }
 
 static bool assigned_dev_msix_masked(MSIXTableEntry *entry)
@@ -1601,6 +1602,7 @@ static void assigned_dev_msix_mmio_write(void *opaque, hwaddr addr,
                 if (ret) {
                     error_report("Error updating irq routing entry (%d)", ret);
                 }
+                kvm_irqchip_commit_routes(kvm_state);
             }
         }
     }
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 6909346..953d7f8 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -325,6 +325,7 @@ static int ivshmem_vector_unmask(PCIDevice *dev, unsigned vector,
     if (ret < 0) {
         return ret;
     }
+    kvm_irqchip_commit_routes(kvm_state);
 
     return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, v->virq);
 }
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 2b2f935..eb09bc6 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -458,6 +458,7 @@ static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg,
                                      PCIDevice *pdev)
 {
     kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg, pdev);
+    kvm_irqchip_commit_routes(kvm_state);
 }
 
 static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index df85f28..6342435 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -872,6 +872,7 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
             if (ret < 0) {
                 return ret;
             }
+            kvm_irqchip_commit_routes(kvm_state);
         }
     }
 
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 94a7f63..b7a20eb 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -367,7 +367,6 @@ int kvm_set_irq(KVMState *s, int irq, int level);
 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg);
 
 void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin);
-void kvm_irqchip_commit_routes(KVMState *s);
 
 void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
 void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
@@ -490,6 +489,7 @@ static inline void cpu_synchronize_post_init(CPUState *cpu)
 int kvm_irqchip_add_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);
 void kvm_irqchip_release_virq(KVMState *s, int virq);
 
 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter);
diff --git a/kvm-all.c b/kvm-all.c
index 95f1df3..8106efb 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1034,8 +1034,6 @@ static int kvm_update_routing_entry(KVMState *s,
 
         *entry = *new_entry;
 
-        kvm_irqchip_commit_routes(s);
-
         return 0;
     }
 
diff --git a/kvm-stub.c b/kvm-stub.c
index 421c9ce..d2c1a5b 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -131,6 +131,10 @@ int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
     return -ENOSYS;
 }
 
+void kvm_irqchip_commit_routes(KVMState *s)
+{
+}
+
 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
 {
     return -ENOSYS;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 579662b..80b3251 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -3382,6 +3382,7 @@ static void kvm_update_msi_routes_all(void *private, bool global,
         kvm_irqchip_update_msi_route(kvm_state, entry->virq,
                                      msg, entry->dev);
     }
+    kvm_irqchip_commit_routes(kvm_state);
     trace_kvm_x86_update_msi_routes(cnt);
 }
 
-- 
2.4.11