pv-qemu 10/10: Make xenconsoled ignore doms with qemu-dm

This patch writes a field /local/vm/DOMID/console/type taking the
value 'ioemu' or 'xenconsoled'. If xenconsoled sees a type that is
not its own, then it skips handling of that guest. The qemu-dm
process doesn't need to read this field since it will only attach
to the console if given the -serial pty arg which XenD already
ensures matches this xenstore field.

The overall behaviour is that if a paravirt guest has a qemu-dm
process running then that handles the console, otherwise the
xenconsoled handles it. The former is more functional, with the
exception of not currently supporting persistent logging to a
file at the same time as exposing a PTY.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index dbc9a8326c..c6dc6cd973 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -377,6 +377,7 @@ int xs_gather(struct xs_handle *xs, const char *dir, ...)
 static int domain_create_ring(struct domain *dom)
 {
 	int err, remote_port, ring_ref, rc;
+	char *type, path[PATH_MAX];
 
 	err = xs_gather(xs, dom->serialpath,
 			"ring-ref", "%u", &ring_ref,
@@ -393,6 +394,14 @@ static int domain_create_ring(struct domain *dom)
 	} else
 		dom->use_consolepath = 0;
 
+	sprintf(path, "%s/type", dom->use_consolepath ? dom->conspath: dom->serialpath);
+	type = xs_read(xs, XBT_NULL, path, NULL);
+	if (type && strcmp(type, "xenconsoled") != 0) {
+		free(type);
+		return 0;
+	}
+	free(type);
+
 	if ((ring_ref == dom->ring_ref) && (remote_port == dom->remote_port))
 		goto out;