[RFC PATCH v5 14/26] Add vhost_svq_set_guest_call_notifier

[Eugenio Pérez]

This allows vhost-vdpa device to set SVQ -> guest notifier to SVQ.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-shadow-virtqueue.h |  1 +
 hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/hw/virtio/vhost-shadow-virtqueue.h 
b/hw/virtio/vhost-shadow-virtqueue.h
index 9e089edb17..607ec6e5eb 100644
--- a/hw/virtio/vhost-shadow-virtqueue.h
+++ b/hw/virtio/vhost-shadow-virtqueue.h
@@ -16,6 +16,7 @@
 typedef struct VhostShadowVirtqueue VhostShadowVirtqueue;
 
 void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd);
+void vhost_svq_set_guest_call_notifier(VhostShadowVirtqueue *svq, int call_fd);
 const EventNotifier *vhost_svq_get_dev_kick_notifier(
                                               const VhostShadowVirtqueue *svq);
 const EventNotifier *vhost_svq_get_svq_call_notifier(
diff --git a/hw/virtio/vhost-shadow-virtqueue.c 
b/hw/virtio/vhost-shadow-virtqueue.c
index 7acac1be87..6535eefccd 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -30,6 +30,9 @@ typedef struct VhostShadowVirtqueue {
      */
     EventNotifier svq_kick;
 
+    /* Guest's call notifier, where SVQ calls guest. */
+    EventNotifier svq_call;
+
     /* Device's host notifier memory region. NULL means no region */
     void *host_notifier_mr;
 
@@ -84,6 +87,19 @@ const EventNotifier *vhost_svq_get_svq_call_notifier(
     return &svq->hdev_call;
 }
 
+/**
+ * Set the call notifier for the SVQ to call the guest
+ *
+ * @svq Shadow virtqueue
+ * @call_fd call notifier
+ *
+ * Called on BQL context.
+ */
+void vhost_svq_set_guest_call_notifier(VhostShadowVirtqueue *svq, int call_fd)
+{
+    event_notifier_init_fd(&svq->svq_call, call_fd);
+}
+
 /**
  * Convenience function to set guest to SVQ kick fd
  *
-- 
2.27.0