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vhost: backend masking support

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Support backend guest notifier masking in vhost-net:
create eventfd at device init, when masked,
make vhost use that as eventfd instead of
sending an interrupt.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2012-12-24 17:37:01 +02:00
parent 24f4fe345c
commit f56a12475f
5 changed files with 137 additions and 16 deletions
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10
hw/vhost.h
View file

@ -18,6 +18,7 @@ struct vhost_virtqueue {
void *ring;
unsigned long long ring_phys;
unsigned ring_size;
EventNotifier masked_notifier;
};
typedef unsigned long vhost_log_chunk_t;
@ -53,4 +54,13 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
/* Test and clear masked event pending status.
* Should be called after unmask to avoid losing events.
*/
bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
/* Mask/unmask events from this vq.
*/
void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
bool mask);
#endif