This is a note to let you know that I've just added the patch titled
vdpa: Add eventfd for the vdpa callback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vdpa-add-eventfd-for-the-vdpa-callback.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e8dfafdd07d0962985a220cccd6aeb9714f465de
Author: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Date: Thu Mar 23 13:30:40 2023 +0800
vdpa: Add eventfd for the vdpa callback
[ Upstream commit 5e68470f4e80a4120e9ecec408f6ab4ad386bd4a ]
Add eventfd for the vdpa callback so that user
can signal it directly instead of triggering the
callback. It will be used for vhost-vdpa case.
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Message-Id: <20230323053043.35-9-xieyongji@xxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Stable-dep-of: 02e9e9366fef ("vhost_vdpa: assign irq bypass producer token correctly")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 019e8c9bedffb..1dc11ba0922d2 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -432,9 +432,11 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
if (vq->call_ctx.ctx) {
cb.callback = vhost_vdpa_virtqueue_cb;
cb.private = vq;
+ cb.trigger = vq->call_ctx.ctx;
} else {
cb.callback = NULL;
cb.private = NULL;
+ cb.trigger = NULL;
}
ops->set_vq_cb(vdpa, idx, &cb);
vhost_vdpa_setup_vq_irq(v, idx);
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 72eaef2caeb14..1c29446aafb44 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -182,6 +182,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
/* Setup virtqueue callback */
cb.callback = virtio_vdpa_virtqueue_cb;
cb.private = info;
+ cb.trigger = NULL;
ops->set_vq_cb(vdpa, index, &cb);
ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 3972ab765de18..4fb198c8dbf61 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -11,10 +11,16 @@
* struct vdpa_calllback - vDPA callback definition.
* @callback: interrupt callback function
* @private: the data passed to the callback function
+ * @trigger: the eventfd for the callback (Optional).
+ * When it is set, the vDPA driver must guarantee that
+ * signaling it is functional equivalent to triggering
+ * the callback. Then vDPA parent can signal it directly
+ * instead of triggering the callback.
*/
struct vdpa_callback {
irqreturn_t (*callback)(void *data);
void *private;
+ struct eventfd_ctx *trigger;
};
/**
