When deleting the vhostuserclient interface, OVS prompts that the interface does not exist, Through the XML file, I found that the "target dev" has a '\n', results in an XML parsing error. XML file: <target dev='vm-20ac9c030a47 '/> That is because 'ovs-vsctl' returns a newline result, always come with a '\n', and the vircommandrun function puts it in ifname. So virNetDevOpenvswitchGetVhostuserIfname should remove '\n' from ifname. Signed-off-by: Yalei Li <liyl43(a)chinatelecom.cn&gt; --- src/util/virnetdevopenvswitch.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c index f9b3369b2a..bd840bd3b7 100644 --- a/src/util/virnetdevopenvswitch.c +++ b/src/util/virnetdevopenvswitch.c @@ -575,6 +575,7 @@ virNetDevOpenvswitchGetVhostuserIfname(const char *path, return 0; } + virStringTrimOptionalNewline(*ifname); if (virNetDevOpenvswitchMaybeUnescapeReply(*ifname) < 0) { VIR_FREE(*ifname); return -1; -- 2.27.0