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vhost: Add Shadow VirtQueue kick forwarding capabilities

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At this mode no buffer forwarding will be performed in SVQ mode: Qemu
will just forward the guest's kicks to the device.

Host memory notifiers regions are left out for simplicity, and they will
not be addressed in this series.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-03-14 18:34:42 +01:00 • committed by Jason Wang
parent 10857ec0ad
commit dff4426fa6
4 changed files with 215 additions and 2 deletions
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14
hw/virtio/vhost-shadow-virtqueue.h
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@ -18,8 +18,22 @@ typedef struct VhostShadowVirtqueue {
EventNotifier hdev_kick;
/* Shadow call notifier, sent to vhost */
EventNotifier hdev_call;
/*
* Borrowed virtqueue's guest to host notifier. To borrow it in this event
* notifier allows to recover the VhostShadowVirtqueue from the event loop
* easily. If we use the VirtQueue's one, we don't have an easy way to
* retrieve VhostShadowVirtqueue.
*
* So shadow virtqueue must not clean it, or we would lose VirtQueue one.
*/
EventNotifier svq_kick;
} VhostShadowVirtqueue;
void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd);
void vhost_svq_stop(VhostShadowVirtqueue *svq);
VhostShadowVirtqueue *vhost_svq_new(void);
void vhost_svq_free(gpointer vq);