From: Jiayu Hu <jiayu...@intel.com>
When the guest memory is hotplugged, the vhost application which
enables DMA acceleration must stop DMA transfers before the vhost
re-maps the guest memory.
This patch is to notify the vhost application of stopping DMA
transfers.
Signed-off-by: Jiayu Hu <jiayu...@intel.com>
---
lib/vhost/vhost_user.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 031c578e54..39e8432d1c 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -1275,6 +1275,15 @@ vhost_user_set_mem_table(struct virtio_net **pdev,
struct VhostUserMsg *msg,
vdpa_dev->ops->dev_close(dev->vid);
dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
}
+
+ /* notify the backend application to stop DMA transfers */
+ if (dev->async_copy && dev->notify_ops->vring_state_changed) {
+ for (i = 0; i < dev->nr_vring; i++) {
+ dev->notify_ops->vring_state_changed(dev->vid,
+ i, 0);
+ }
+ }
+
free_mem_region(dev);
rte_free(dev->mem);
dev->mem = NULL;
--
2.29.2
