This simplifies the code and removes the ioeventfd_started
and ioeventfd_set_started callback.  The only difference is
in how virtio-ccw handles an error---it doesn't disable
ioeventfd forever anymore.  It was the only backend to do
so, and if desired this behavior should be implemented in
virtio-bus.c.

Instead of ioeventfd_started, the ioeventfd_assign callback now
determines whether the virtio bus supports host notifiers.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 hw/block/dataplane/virtio-blk.c |  2 +-
 hw/s390x/virtio-ccw.c           | 21 ---------------------
 hw/s390x/virtio-ccw.h           |  1 -
 hw/scsi/virtio-scsi-dataplane.c |  2 +-
 hw/virtio/vhost.c               |  2 +-
 hw/virtio/virtio-bus.c          | 14 ++++++--------
 hw/virtio/virtio-mmio.c         | 18 ------------------
 hw/virtio/virtio-pci.c          | 17 -----------------
 hw/virtio/virtio-pci.h          |  1 -
 include/hw/virtio/virtio-bus.h  | 17 +++++++----------
 10 files changed, 16 insertions(+), 79 deletions(-)

diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 704a763..9b268f4 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -93,7 +93,7 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, 
VirtIOBlkConf *conf,
     }
 
     /* Don't try if transport does not support notifiers. */
-    if (!k->set_guest_notifiers || !k->ioeventfd_started) {
+    if (!k->set_guest_notifiers || !k->ioeventfd_assign) {
         error_setg(errp,
                    "device is incompatible with dataplane "
                    "(transport does not support notifiers)");
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index f3ed9ab..3e450eb 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -59,25 +59,6 @@ static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
     virtio_bus_stop_ioeventfd(&dev->bus);
 }
 
-static bool virtio_ccw_ioeventfd_started(DeviceState *d)
-{
-    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
-
-    return dev->ioeventfd_started;
-}
-
-static void virtio_ccw_ioeventfd_set_started(DeviceState *d, bool started,
-                                             bool err)
-{
-    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
-
-    dev->ioeventfd_started = started;
-    if (err) {
-        /* Disable ioeventfd for this device. */
-        dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
-    }
-}
-
 static bool virtio_ccw_ioeventfd_disabled(DeviceState *d)
 {
     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
@@ -1588,8 +1569,6 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, 
void *data)
     k->device_plugged = virtio_ccw_device_plugged;
     k->post_plugged = virtio_ccw_post_plugged;
     k->device_unplugged = virtio_ccw_device_unplugged;
-    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_assign = virtio_ccw_ioeventfd_assign;
 }
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index 1f5fce0..83179c5 100644
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -82,7 +82,6 @@ struct VirtioCcwDevice {
     int revision;
     uint32_t max_rev;
     VirtioBusState bus;
-    bool ioeventfd_started;
     uint32_t flags;
     uint8_t thinint_isc;
     AdapterRoutes routes;
diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c
index b173b94..f537b4e 100644
--- a/hw/scsi/virtio-scsi-dataplane.c
+++ b/hw/scsi/virtio-scsi-dataplane.c
@@ -31,7 +31,7 @@ void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread 
*iothread)
     s->ctx = iothread_get_aio_context(vs->conf.iothread);
 
     /* Don't try if transport does not support notifiers. */
-    if (!k->set_guest_notifiers || !k->ioeventfd_started) {
+    if (!k->set_guest_notifiers || !k->ioeventfd_assign) {
         fprintf(stderr, "virtio-scsi: Failed to set iothread "
                    "(transport does not support notifiers)");
         exit(1);
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 3d0c807..c5a1fe0 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1176,7 +1176,7 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, 
VirtIODevice *vdev)
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
     int i, r, e;
 
-    if (!k->ioeventfd_started) {
+    if (!k->ioeventfd_assign) {
         error_report("binding does not support host notifiers");
         r = -ENOSYS;
         goto fail;
diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
index 859b53f..64daf34 100644
--- a/hw/virtio/virtio-bus.c
+++ b/hw/virtio/virtio-bus.c
@@ -190,10 +190,10 @@ void virtio_bus_start_ioeventfd(VirtioBusState *bus)
     VirtIODevice *vdev;
     int n, r;
 
-    if (!k->ioeventfd_started || k->ioeventfd_started(proxy)) {
+    if (!k->ioeventfd_assign || k->ioeventfd_disabled(proxy)) {
         return;
     }
-    if (bus->ioeventfd_disabled || k->ioeventfd_disabled(proxy)) {
+    if (bus->ioeventfd_started || bus->ioeventfd_disabled) {
         return;
     }
     vdev = virtio_bus_get_device(bus);
@@ -206,7 +206,7 @@ void virtio_bus_start_ioeventfd(VirtioBusState *bus)
             goto assign_error;
         }
     }
-    k->ioeventfd_set_started(proxy, true, false);
+    bus->ioeventfd_started = true;
     return;
 
 assign_error:
@@ -218,18 +218,16 @@ assign_error:
         r = set_host_notifier_internal(proxy, bus, n, false, false);
         assert(r >= 0);
     }
-    k->ioeventfd_set_started(proxy, false, true);
     error_report("%s: failed. Fallback to userspace (slower).", __func__);
 }
 
 void virtio_bus_stop_ioeventfd(VirtioBusState *bus)
 {
-    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
     DeviceState *proxy = DEVICE(BUS(bus)->parent);
     VirtIODevice *vdev;
     int n, r;
 
-    if (!k->ioeventfd_started || !k->ioeventfd_started(proxy)) {
+    if (!bus->ioeventfd_started) {
         return;
     }
     vdev = virtio_bus_get_device(bus);
@@ -240,7 +238,7 @@ void virtio_bus_stop_ioeventfd(VirtioBusState *bus)
         r = set_host_notifier_internal(proxy, bus, n, false, false);
         assert(r >= 0);
     }
-    k->ioeventfd_set_started(proxy, false, false);
+    bus->ioeventfd_started = false;
 }
 
 /*
@@ -252,7 +250,7 @@ int virtio_bus_set_host_notifier(VirtioBusState *bus, int 
n, bool assign)
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
     DeviceState *proxy = DEVICE(BUS(bus)->parent);
 
-    if (!k->ioeventfd_started) {
+    if (!k->ioeventfd_assign) {
         return -ENOSYS;
     }
     bus->ioeventfd_disabled = assign;
diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index 12a9e79..04a9655 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -89,25 +89,9 @@ typedef struct {
     uint32_t guest_page_shift;
     /* virtio-bus */
     VirtioBusState bus;
-    bool ioeventfd_started;
     bool format_transport_address;
 } VirtIOMMIOProxy;
 
-static bool virtio_mmio_ioeventfd_started(DeviceState *d)
-{
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
-
-    return proxy->ioeventfd_started;
-}
-
-static void virtio_mmio_ioeventfd_set_started(DeviceState *d, bool started,
-                                              bool err)
-{
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
-
-    proxy->ioeventfd_started = started;
-}
-
 static bool virtio_mmio_ioeventfd_disabled(DeviceState *d)
 {
     return !kvm_eventfds_enabled();
@@ -547,8 +531,6 @@ static void virtio_mmio_bus_class_init(ObjectClass *klass, 
void *data)
     k->save_config = virtio_mmio_save_config;
     k->load_config = virtio_mmio_load_config;
     k->set_guest_notifiers = virtio_mmio_set_guest_notifiers;
-    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_assign = virtio_mmio_ioeventfd_assign;
     k->has_variable_vring_alignment = true;
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 67a0824..a5d8c8d 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -262,21 +262,6 @@ static int virtio_pci_load_queue(DeviceState *d, int n, 
QEMUFile *f)
     return 0;
 }
 
-static bool virtio_pci_ioeventfd_started(DeviceState *d)
-{
-    VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
-
-    return proxy->ioeventfd_started;
-}
-
-static void virtio_pci_ioeventfd_set_started(DeviceState *d, bool started,
-                                             bool err)
-{
-    VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
-
-    proxy->ioeventfd_started = started;
-}
-
 static bool virtio_pci_ioeventfd_disabled(DeviceState *d)
 {
     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
@@ -2439,8 +2424,6 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, 
void *data)
     k->device_plugged = virtio_pci_device_plugged;
     k->device_unplugged = virtio_pci_device_unplugged;
     k->query_nvectors = virtio_pci_query_nvectors;
-    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_assign = virtio_pci_ioeventfd_assign;
 }
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 1212ac8..1d7063c 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -149,7 +149,6 @@ struct VirtIOPCIProxy {
     uint32_t guest_features[2];
     VirtIOPCIQueue vqs[VIRTIO_QUEUE_MAX];
 
-    bool ioeventfd_started;
     VirtIOIRQFD *vector_irqfd;
     int nvqs_with_notifiers;
     VirtioBusState bus;
diff --git a/include/hw/virtio/virtio-bus.h b/include/hw/virtio/virtio-bus.h
index 03a708a..7031add 100644
--- a/include/hw/virtio/virtio-bus.h
+++ b/include/hw/virtio/virtio-bus.h
@@ -70,17 +70,9 @@ typedef struct VirtioBusClass {
     void (*device_unplugged)(DeviceState *d);
     int (*query_nvectors)(DeviceState *d);
     /*
-     * ioeventfd handling: if the transport implements ioeventfd_started,
-     * it must implement the other ioeventfd callbacks as well
+     * ioeventfd handling: if the transport implements ioeventfd_assign,
+     * it must implement ioeventfd_disabled as well.
      */
-    /* Returns true if the ioeventfd has been started for the device. */
-    bool (*ioeventfd_started)(DeviceState *d);
-    /*
-     * Sets the 'ioeventfd started' state after the ioeventfd has been
-     * started/stopped for the device. err signifies whether an error
-     * had occurred.
-     */
-    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);
     /*
@@ -106,6 +98,11 @@ struct VirtioBusState {
      * or dataplane.
      */
     bool ioeventfd_disabled;
+
+    /*
+     * Set if ioeventfd has been started.
+     */
+    bool ioeventfd_started;
 };
 
 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp);
-- 
2.7.4



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