diff mbox series

[v2,3/3] vhost: handle memory hotplug for async vhost

Message ID 20210615141513.16163-4-cheng1.jiang@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series vhost: handle memory hotplug for async vhost | expand


Context Check Description
ci/iol-mellanox-Functional fail Functional Testing issues
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-testing success Testing PASS
ci/intel-Testing success Testing PASS
ci/iol-abi-testing success Testing PASS
ci/github-robot success github build: passed
ci/Intel-compilation success Compilation OK
ci/iol-intel-Functional success Functional Testing PASS
ci/checkpatch success coding style OK

Commit Message

Jiang, Cheng1 June 15, 2021, 2:15 p.m. UTC
From: Jiayu Hu <jiayu.hu@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

Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
 lib/vhost/vhost_user.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series


diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 8f0eba6412..6800e60c2d 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -1223,6 +1223,15 @@  vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
 			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);
+			}
+		}
 		dev->mem = NULL;