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virtio: remove set_handler argument from set_host_notifier_internal 

Make virtio_device_start_ioeventfd_impl use the same logic as
dataplane to set up the host notifier.  This removes the need
for the set_handler argument in set_host_notifier_internal.

This is a first step towards using virtio_bus_set_host_notifier
as the sole entry point to set up ioeventfds.  At least now
the functions have the same interface, but they still differ
in that virtio_bus_set_host_notifier sets ioeventfd_disabled.

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>
This commit is contained in:
Paolo Bonzini 2016-10-21 22:48:12 +02:00 committed by Michael S. Tsirkin
parent f1ac6a5522
commit 6019f3b966
3 changed files with 17 additions and 13 deletions
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12
hw/virtio/virtio-bus.c
View File

@ -147,14 +147,8 @@ void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
}
}
/*
* This function handles both assigning the ioeventfd handler and
* registering it with the kernel.
* assign: register/deregister ioeventfd with the kernel
* set_handler: use the generic ioeventfd handler
*/
int set_host_notifier_internal(DeviceState *proxy, VirtioBusState *bus,
int n, bool assign, bool set_handler)
int n, bool assign)
{
VirtIODevice *vdev = virtio_bus_get_device(bus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
@ -169,7 +163,7 @@ int set_host_notifier_internal(DeviceState *proxy, VirtioBusState *bus,
__func__, strerror(-r), r);
return r;
}
virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
virtio_queue_set_host_notifier_fd_handler(vq, true, false);
r = k->ioeventfd_assign(proxy, notifier, n, assign);
if (r < 0) {
error_report("%s: unable to assign ioeventfd: %d", __func__, r);
@ -257,7 +251,7 @@ int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
*/
virtio_bus_stop_ioeventfd(bus);
}
return set_host_notifier_internal(proxy, bus, n, assign, false);
return set_host_notifier_internal(proxy, bus, n, assign);
}
static char *virtio_bus_get_dev_path(DeviceState *dev)

16
hw/virtio/virtio.c
View File

@ -2152,11 +2152,21 @@ static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev)
if (!virtio_queue_get_num(vdev, n)) {
continue;
}
r = set_host_notifier_internal(proxy, qbus, n, true, true);
r = set_host_notifier_internal(proxy, qbus, n, true);
if (r < 0) {
err = r;
goto assign_error;
}
virtio_queue_set_host_notifier_fd_handler(&vdev->vq[n], true, true);
}
for (n = 0; n < VIRTIO_QUEUE_MAX; n++) {
/* Kick right away to begin processing requests already in vring */
VirtQueue *vq = &vdev->vq[n];
if (!vq->vring.num) {
continue;
}
event_notifier_set(&vq->host_notifier);
}
return 0;
@ -2166,7 +2176,7 @@ assign_error:
continue;
}
r = set_host_notifier_internal(proxy, qbus, n, false, false);
r = set_host_notifier_internal(proxy, qbus, n, false);
assert(r >= 0);
}
return err;
@ -2190,7 +2200,7 @@ static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev)
if (!virtio_queue_get_num(vdev, n)) {
continue;
}
r = set_host_notifier_internal(proxy, qbus, n, false, false);
r = set_host_notifier_internal(proxy, qbus, n, false);
assert(r >= 0);
}
}

2
include/hw/virtio/virtio-bus.h
View File

@ -143,6 +143,6 @@ int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign);
/* This is temporary. It is only needed because virtio_bus_set_host_notifier
* sets ioeventfd_disabled but we will shortly get rid of it. */
int set_host_notifier_internal(DeviceState *proxy, VirtioBusState *bus,
int n, bool assign, bool set_handler);
int n, bool assign);
#endif /* VIRTIO_BUS_H */