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virtio: poll virtqueues for new buffers 

Add an AioContext poll handler to detect new virtqueue buffers without
waiting for a guest->host notification.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20161201192652.9509-5-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2016-12-01 19:26:43 +00:00
parent 4a1cba3802
commit 0062ea0fd6
1 changed files with 15 additions and 1 deletions
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16
hw/virtio/virtio.c
View File

@ -2047,13 +2047,27 @@ static void virtio_queue_host_notifier_aio_read(EventNotifier *n)
}
}
static bool virtio_queue_host_notifier_aio_poll(void *opaque)
{
EventNotifier *n = opaque;
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
if (virtio_queue_empty(vq)) {
return false;
}
virtio_queue_notify_aio_vq(vq);
return true;
}
void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
VirtIOHandleOutput handle_output)
{
if (handle_output) {
vq->handle_aio_output = handle_output;
aio_set_event_notifier(ctx, &vq->host_notifier, true,
virtio_queue_host_notifier_aio_read, NULL);
virtio_queue_host_notifier_aio_read,
virtio_queue_host_notifier_aio_poll);
} else {
aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL);
/* Test and clear notifier before after disabling event,