virtio: move ioeventfd_disabled flag to VirtioBusState

This simplifies the code and removes the ioeventfd_set_disabled
callback.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/s390x/virtio-ccw.c

@@ -82,15 +82,7 @@ static bool virtio_ccw_ioeventfd_disabled(DeviceState *d)
 {
     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
 
-    return dev->ioeventfd_disabled ||
-        !(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD);
-}
-
-static void virtio_ccw_ioeventfd_set_disabled(DeviceState *d, bool disabled)
-{
-    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
-
-    dev->ioeventfd_disabled = disabled;
+    return !(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD);
 }
 
 static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
@@ -1619,7 +1611,6 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
     k->ioeventfd_started = virtio_ccw_ioeventfd_started;
     k->ioeventfd_set_started = virtio_ccw_ioeventfd_set_started;
     k->ioeventfd_disabled = virtio_ccw_ioeventfd_disabled;
-    k->ioeventfd_set_disabled = virtio_ccw_ioeventfd_set_disabled;
     k->ioeventfd_assign = virtio_ccw_ioeventfd_assign;
 }
 

hw/s390x/virtio-ccw.h

@@ -87,7 +87,6 @@ struct VirtioCcwDevice {
     uint32_t max_rev;
     VirtioBusState bus;
     bool ioeventfd_started;
-    bool ioeventfd_disabled;
     uint32_t flags;
     uint8_t thinint_isc;
     AdapterRoutes routes;

hw/virtio/virtio-bus.c

@@ -195,7 +195,7 @@ void virtio_bus_start_ioeventfd(VirtioBusState *bus)
     if (!k->ioeventfd_started || k->ioeventfd_started(proxy)) {
         return;
     }
-    if (k->ioeventfd_disabled(proxy)) {
+    if (bus->ioeventfd_disabled || k->ioeventfd_disabled(proxy)) {
         return;
     }
     vdev = virtio_bus_get_device(bus);
@@ -257,7 +257,7 @@ int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
     if (!k->ioeventfd_started) {
         return -ENOSYS;
     }
-    k->ioeventfd_set_disabled(proxy, assign);
+    bus->ioeventfd_disabled = assign;
     if (assign) {
         /*
          * Stop using the generic ioeventfd, we are doing eventfd handling

hw/virtio/virtio-mmio.c

@@ -89,7 +89,6 @@ typedef struct {
     uint32_t guest_page_shift;
     /* virtio-bus */
     VirtioBusState bus;
-    bool ioeventfd_disabled;
     bool ioeventfd_started;
     bool format_transport_address;
 } VirtIOMMIOProxy;
@@ -111,16 +110,7 @@ static void virtio_mmio_ioeventfd_set_started(DeviceState *d, bool started,
 
 static bool virtio_mmio_ioeventfd_disabled(DeviceState *d)
 {
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
-
-    return !kvm_eventfds_enabled() || proxy->ioeventfd_disabled;
-}
-
-static void virtio_mmio_ioeventfd_set_disabled(DeviceState *d, bool disabled)
-{
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
-
-    proxy->ioeventfd_disabled = disabled;
+    return !kvm_eventfds_enabled();
 }
 
 static int virtio_mmio_ioeventfd_assign(DeviceState *d,
@@ -560,7 +550,6 @@ static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
     k->ioeventfd_started = virtio_mmio_ioeventfd_started;
     k->ioeventfd_set_started = virtio_mmio_ioeventfd_set_started;
     k->ioeventfd_disabled = virtio_mmio_ioeventfd_disabled;
-    k->ioeventfd_set_disabled = virtio_mmio_ioeventfd_set_disabled;
     k->ioeventfd_assign = virtio_mmio_ioeventfd_assign;
     k->has_variable_vring_alignment = true;
     bus_class->max_dev = 1;

hw/virtio/virtio-pci.c

@@ -281,15 +281,7 @@ static bool virtio_pci_ioeventfd_disabled(DeviceState *d)
 {
     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 
-    return proxy->ioeventfd_disabled ||
-        !(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD);
-}
-
-static void virtio_pci_ioeventfd_set_disabled(DeviceState *d, bool disabled)
-{
-    VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
-
-    proxy->ioeventfd_disabled = disabled;
+    return !(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD);
 }
 
 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
@@ -2542,7 +2534,6 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
     k->ioeventfd_started = virtio_pci_ioeventfd_started;
     k->ioeventfd_set_started = virtio_pci_ioeventfd_set_started;
     k->ioeventfd_disabled = virtio_pci_ioeventfd_disabled;
-    k->ioeventfd_set_disabled = virtio_pci_ioeventfd_set_disabled;
     k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
 }
 

hw/virtio/virtio-pci.h

@@ -158,7 +158,6 @@ struct VirtIOPCIProxy {
     uint32_t guest_features[2];
     VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX];
 
-    bool ioeventfd_disabled;
     bool ioeventfd_started;
     VirtIOIRQFD *vector_irqfd;
     int nvqs_with_notifiers;

include/hw/virtio/virtio-bus.h

@@ -83,8 +83,6 @@ typedef struct VirtioBusClass {
     void (*ioeventfd_set_started)(DeviceState *d, bool started, bool err);
     /* Returns true if the ioeventfd has been disabled for the device. */
     bool (*ioeventfd_disabled)(DeviceState *d);
-    /* Sets the 'ioeventfd disabled' state for the device. */
-    void (*ioeventfd_set_disabled)(DeviceState *d, bool disabled);
     /*
      * Assigns/deassigns the ioeventfd backing for the transport on
      * the device for queue number n. Returns an error value on
@@ -102,6 +100,12 @@ typedef struct VirtioBusClass {
 
 struct VirtioBusState {
     BusState parent_obj;
+
+    /*
+     * Set if the default ioeventfd handlers are disabled by vhost
+     * or dataplane.
+     */
+    bool ioeventfd_disabled;
 };
 
 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp);