diff mbox series

[09/12] vhost: add support to postcopy's end request

Message ID 20180926072705.22641-10-maxime.coquelin@redhat.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series vhost: add postcopy live-migration support | expand

Checks

Context Check Description
ci/Intel-compilation success Compilation OK

Commit Message

Maxime Coquelin Sept. 26, 2018, 7:27 a.m. UTC
The master sends this message before stopping handling
userfaults, so that the backend closes the userfaultfd.

The master waits for the slave to acknowledge the request
with an empty 64bits payload for synchronization purpose.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vhost_user.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
diff mbox series

Patch

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 766df7a58..83b080610 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -75,6 +75,7 @@  static const char *vhost_message_str[VHOST_USER_MAX] = {
 	[VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
 	[VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
 	[VHOST_USER_POSTCOPY_LISTEN]  = "VHOST_USER_POSTCOPY_LISTEN",
+	[VHOST_USER_POSTCOPY_END]  = "VHOST_USER_POSTCOPY_END",
 };
 
 static int
@@ -1524,6 +1525,18 @@  vhost_user_set_postcopy_listen(struct virtio_net *dev)
 	return 0;
 }
 
+static int
+vhost_user_postcopy_end(struct virtio_net *dev)
+{
+	dev->postcopy_listening = 0;
+	if (dev->postcopy_ufd > 0) {
+		close(dev->postcopy_ufd);
+		dev->postcopy_ufd = -1;
+	}
+
+	return 0;
+}
+
 /* return bytes# of read on success or negative val on failure. */
 static int
 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
@@ -1877,6 +1890,14 @@  vhost_user_msg_handler(int vid, int fd)
 		ret = vhost_user_set_postcopy_listen(dev);
 		break;
 
+	case VHOST_USER_POSTCOPY_END:
+		vhost_user_postcopy_end(dev);
+		msg.payload.u64 = 0;
+		msg.size = sizeof(msg.payload.u64);
+		msg.fd_num = 0;
+		send_vhost_reply(fd, &msg);
+		break;
+
 	default:
 		ret = -1;
 		break;