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[PULL V2 11/25] vhost: add vhost_svq_push_elem
From: |
Jason Wang |
Subject: |
[PULL V2 11/25] vhost: add vhost_svq_push_elem |
Date: |
Wed, 20 Jul 2022 17:02:59 +0800 |
From: Eugenio Pérez <eperezma@redhat.com>
This function allows external SVQ users to return guest's available
buffers.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++
hw/virtio/vhost-shadow-virtqueue.h | 3 +++
2 files changed, 19 insertions(+)
diff --git a/hw/virtio/vhost-shadow-virtqueue.c
b/hw/virtio/vhost-shadow-virtqueue.c
index 8314405..1669b1f 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -428,6 +428,22 @@ static VirtQueueElement
*vhost_svq_get_buf(VhostShadowVirtqueue *svq,
return g_steal_pointer(&svq->desc_state[used_elem.id].elem);
}
+/**
+ * Push an element to SVQ, returning it to the guest.
+ */
+void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
+ const VirtQueueElement *elem, uint32_t len)
+{
+ virtqueue_push(svq->vq, elem, len);
+ if (svq->next_guest_avail_elem) {
+ /*
+ * Avail ring was full when vhost_svq_flush was called, so it's a
+ * good moment to make more descriptors available if possible.
+ */
+ vhost_handle_guest_kick(svq);
+ }
+}
+
static void vhost_svq_flush(VhostShadowVirtqueue *svq,
bool check_for_avail_queue)
{
diff --git a/hw/virtio/vhost-shadow-virtqueue.h
b/hw/virtio/vhost-shadow-virtqueue.h
index 5c7e7cb..d9fc1f1 100644
--- a/hw/virtio/vhost-shadow-virtqueue.h
+++ b/hw/virtio/vhost-shadow-virtqueue.h
@@ -84,6 +84,9 @@ typedef struct VhostShadowVirtqueue {
bool vhost_svq_valid_features(uint64_t features, Error **errp);
+void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
+ const VirtQueueElement *elem, uint32_t len);
+
void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd);
void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd);
void vhost_svq_get_vring_addr(const VhostShadowVirtqueue *svq,
--
2.7.4
- [PULL V2 00/25] Net patches, Jason Wang, 2022/07/20
- [PULL V2 01/25] vhost: move descriptor translation to vhost_svq_vring_write_descs, Jason Wang, 2022/07/20
- [PULL V2 02/25] virtio-net: Expose MAC_TABLE_ENTRIES, Jason Wang, 2022/07/20
- [PULL V2 03/25] virtio-net: Expose ctrl virtqueue logic, Jason Wang, 2022/07/20
- [PULL V2 04/25] vdpa: Avoid compiler to squash reads to used idx, Jason Wang, 2022/07/20
- [PULL V2 06/25] vhost: Move vhost_svq_kick call to vhost_svq_add, Jason Wang, 2022/07/20
- [PULL V2 07/25] vhost: Check for queue full at vhost_svq_add, Jason Wang, 2022/07/20
- [PULL V2 08/25] vhost: Decouple vhost_svq_add from VirtQueueElement, Jason Wang, 2022/07/20
- [PULL V2 09/25] vhost: Add SVQDescState, Jason Wang, 2022/07/20
- [PULL V2 10/25] vhost: Track number of descs in SVQDescState, Jason Wang, 2022/07/20
- [PULL V2 11/25] vhost: add vhost_svq_push_elem,
Jason Wang <=
- [PULL V2 05/25] vhost: Reorder vhost_svq_kick, Jason Wang, 2022/07/20
- [PULL V2 17/25] vdpa: manual forward CVQ buffers, Jason Wang, 2022/07/20
- [PULL V2 15/25] vdpa: Export vhost_vdpa_dma_map and unmap calls, Jason Wang, 2022/07/20
- [PULL V2 19/25] vdpa: Extract get features part from vhost_vdpa_get_max_queue_pairs, Jason Wang, 2022/07/20
- [PULL V2 22/25] softmmu/runstate.c: add RunStateTransition support form COLO to PRELAUNCH, Jason Wang, 2022/07/20
- [PULL V2 12/25] vhost: Expose vhost_svq_add, Jason Wang, 2022/07/20
- [PULL V2 14/25] vhost: Add svq avail_handler callback, Jason Wang, 2022/07/20
- [PULL V2 13/25] vhost: add vhost_svq_poll, Jason Wang, 2022/07/20