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vhost: Expose vhost_svq_available_slots() 

Next patches in this series will delay the polling
and checking of buffers until either the SVQ is
full or control commands shadow buffers are full,
no longer perform an immediate poll and check of
the device's used buffers for each CVQ state load command.

To achieve this, this patch exposes
vhost_svq_available_slots(), allowing QEMU to know
whether the SVQ is full.

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <25938079f0bd8185fd664c64e205e629f7a966be.1697165821.git.yin31149@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hawkins Jiawei 2023-10-13 16:09:41 +08:00 committed by Michael S. Tsirkin
parent 1d7e2a8fd4
commit 99d6a32469
2 changed files with 2 additions and 1 deletions
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2
hw/virtio/vhost-shadow-virtqueue.c
View File

@ -66,7 +66,7 @@ bool vhost_svq_valid_features(uint64_t features, Error **errp)
*
* @svq: The svq
*/
static uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq)
uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq)
{
return svq->num_free;
}

1
hw/virtio/vhost-shadow-virtqueue.h
View File

@ -114,6 +114,7 @@ typedef struct VhostShadowVirtqueue {
bool vhost_svq_valid_features(uint64_t features, Error **errp);
uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq);
void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
const VirtQueueElement *elem, uint32_t len);
int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg,